| File: | build/source/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp |
| Warning: | line 4659, column 16 1st function call argument is an uninitialized value |
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| 1 | //===-- lib/CodeGen/GlobalISel/GICombinerHelper.cpp -----------------------===// | |||
| 2 | // | |||
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
| 4 | // See https://llvm.org/LICENSE.txt for license information. | |||
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
| 6 | // | |||
| 7 | //===----------------------------------------------------------------------===// | |||
| 8 | #include "llvm/CodeGen/GlobalISel/CombinerHelper.h" | |||
| 9 | #include "llvm/ADT/SetVector.h" | |||
| 10 | #include "llvm/ADT/SmallBitVector.h" | |||
| 11 | #include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h" | |||
| 12 | #include "llvm/CodeGen/GlobalISel/GISelKnownBits.h" | |||
| 13 | #include "llvm/CodeGen/GlobalISel/GenericMachineInstrs.h" | |||
| 14 | #include "llvm/CodeGen/GlobalISel/LegalizerHelper.h" | |||
| 15 | #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h" | |||
| 16 | #include "llvm/CodeGen/GlobalISel/MIPatternMatch.h" | |||
| 17 | #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h" | |||
| 18 | #include "llvm/CodeGen/GlobalISel/Utils.h" | |||
| 19 | #include "llvm/CodeGen/LowLevelTypeUtils.h" | |||
| 20 | #include "llvm/CodeGen/MachineBasicBlock.h" | |||
| 21 | #include "llvm/CodeGen/MachineDominators.h" | |||
| 22 | #include "llvm/CodeGen/MachineInstr.h" | |||
| 23 | #include "llvm/CodeGen/MachineMemOperand.h" | |||
| 24 | #include "llvm/CodeGen/MachineRegisterInfo.h" | |||
| 25 | #include "llvm/CodeGen/RegisterBankInfo.h" | |||
| 26 | #include "llvm/CodeGen/TargetInstrInfo.h" | |||
| 27 | #include "llvm/CodeGen/TargetLowering.h" | |||
| 28 | #include "llvm/CodeGen/TargetOpcodes.h" | |||
| 29 | #include "llvm/IR/DataLayout.h" | |||
| 30 | #include "llvm/IR/InstrTypes.h" | |||
| 31 | #include "llvm/Support/Casting.h" | |||
| 32 | #include "llvm/Support/DivisionByConstantInfo.h" | |||
| 33 | #include "llvm/Support/MathExtras.h" | |||
| 34 | #include "llvm/Target/TargetMachine.h" | |||
| 35 | #include <cmath> | |||
| 36 | #include <optional> | |||
| 37 | #include <tuple> | |||
| 38 | ||||
| 39 | #define DEBUG_TYPE"gi-combiner" "gi-combiner" | |||
| 40 | ||||
| 41 | using namespace llvm; | |||
| 42 | using namespace MIPatternMatch; | |||
| 43 | ||||
| 44 | // Option to allow testing of the combiner while no targets know about indexed | |||
| 45 | // addressing. | |||
| 46 | static cl::opt<bool> | |||
| 47 | ForceLegalIndexing("force-legal-indexing", cl::Hidden, cl::init(false), | |||
| 48 | cl::desc("Force all indexed operations to be " | |||
| 49 | "legal for the GlobalISel combiner")); | |||
| 50 | ||||
| 51 | CombinerHelper::CombinerHelper(GISelChangeObserver &Observer, | |||
| 52 | MachineIRBuilder &B, bool IsPreLegalize, | |||
| 53 | GISelKnownBits *KB, MachineDominatorTree *MDT, | |||
| 54 | const LegalizerInfo *LI) | |||
| 55 | : Builder(B), MRI(Builder.getMF().getRegInfo()), Observer(Observer), KB(KB), | |||
| 56 | MDT(MDT), IsPreLegalize(IsPreLegalize), LI(LI), | |||
| 57 | RBI(Builder.getMF().getSubtarget().getRegBankInfo()), | |||
| 58 | TRI(Builder.getMF().getSubtarget().getRegisterInfo()) { | |||
| 59 | (void)this->KB; | |||
| 60 | } | |||
| 61 | ||||
| 62 | const TargetLowering &CombinerHelper::getTargetLowering() const { | |||
| 63 | return *Builder.getMF().getSubtarget().getTargetLowering(); | |||
| 64 | } | |||
| 65 | ||||
| 66 | /// \returns The little endian in-memory byte position of byte \p I in a | |||
| 67 | /// \p ByteWidth bytes wide type. | |||
| 68 | /// | |||
| 69 | /// E.g. Given a 4-byte type x, x[0] -> byte 0 | |||
| 70 | static unsigned littleEndianByteAt(const unsigned ByteWidth, const unsigned I) { | |||
| 71 | assert(I < ByteWidth && "I must be in [0, ByteWidth)")(static_cast <bool> (I < ByteWidth && "I must be in [0, ByteWidth)" ) ? void (0) : __assert_fail ("I < ByteWidth && \"I must be in [0, ByteWidth)\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 71, __extension__ __PRETTY_FUNCTION__)); | |||
| 72 | return I; | |||
| 73 | } | |||
| 74 | ||||
| 75 | /// Determines the LogBase2 value for a non-null input value using the | |||
| 76 | /// transform: LogBase2(V) = (EltBits - 1) - ctlz(V). | |||
| 77 | static Register buildLogBase2(Register V, MachineIRBuilder &MIB) { | |||
| 78 | auto &MRI = *MIB.getMRI(); | |||
| 79 | LLT Ty = MRI.getType(V); | |||
| 80 | auto Ctlz = MIB.buildCTLZ(Ty, V); | |||
| 81 | auto Base = MIB.buildConstant(Ty, Ty.getScalarSizeInBits() - 1); | |||
| 82 | return MIB.buildSub(Ty, Base, Ctlz).getReg(0); | |||
| 83 | } | |||
| 84 | ||||
| 85 | /// \returns The big endian in-memory byte position of byte \p I in a | |||
| 86 | /// \p ByteWidth bytes wide type. | |||
| 87 | /// | |||
| 88 | /// E.g. Given a 4-byte type x, x[0] -> byte 3 | |||
| 89 | static unsigned bigEndianByteAt(const unsigned ByteWidth, const unsigned I) { | |||
| 90 | assert(I < ByteWidth && "I must be in [0, ByteWidth)")(static_cast <bool> (I < ByteWidth && "I must be in [0, ByteWidth)" ) ? void (0) : __assert_fail ("I < ByteWidth && \"I must be in [0, ByteWidth)\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 90, __extension__ __PRETTY_FUNCTION__)); | |||
| 91 | return ByteWidth - I - 1; | |||
| 92 | } | |||
| 93 | ||||
| 94 | /// Given a map from byte offsets in memory to indices in a load/store, | |||
| 95 | /// determine if that map corresponds to a little or big endian byte pattern. | |||
| 96 | /// | |||
| 97 | /// \param MemOffset2Idx maps memory offsets to address offsets. | |||
| 98 | /// \param LowestIdx is the lowest index in \p MemOffset2Idx. | |||
| 99 | /// | |||
| 100 | /// \returns true if the map corresponds to a big endian byte pattern, false if | |||
| 101 | /// it corresponds to a little endian byte pattern, and std::nullopt otherwise. | |||
| 102 | /// | |||
| 103 | /// E.g. given a 32-bit type x, and x[AddrOffset], the in-memory byte patterns | |||
| 104 | /// are as follows: | |||
| 105 | /// | |||
| 106 | /// AddrOffset Little endian Big endian | |||
| 107 | /// 0 0 3 | |||
| 108 | /// 1 1 2 | |||
| 109 | /// 2 2 1 | |||
| 110 | /// 3 3 0 | |||
| 111 | static std::optional<bool> | |||
| 112 | isBigEndian(const SmallDenseMap<int64_t, int64_t, 8> &MemOffset2Idx, | |||
| 113 | int64_t LowestIdx) { | |||
| 114 | // Need at least two byte positions to decide on endianness. | |||
| 115 | unsigned Width = MemOffset2Idx.size(); | |||
| 116 | if (Width < 2) | |||
| 117 | return std::nullopt; | |||
| 118 | bool BigEndian = true, LittleEndian = true; | |||
| 119 | for (unsigned MemOffset = 0; MemOffset < Width; ++ MemOffset) { | |||
| 120 | auto MemOffsetAndIdx = MemOffset2Idx.find(MemOffset); | |||
| 121 | if (MemOffsetAndIdx == MemOffset2Idx.end()) | |||
| 122 | return std::nullopt; | |||
| 123 | const int64_t Idx = MemOffsetAndIdx->second - LowestIdx; | |||
| 124 | assert(Idx >= 0 && "Expected non-negative byte offset?")(static_cast <bool> (Idx >= 0 && "Expected non-negative byte offset?" ) ? void (0) : __assert_fail ("Idx >= 0 && \"Expected non-negative byte offset?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 124, __extension__ __PRETTY_FUNCTION__)); | |||
| 125 | LittleEndian &= Idx == littleEndianByteAt(Width, MemOffset); | |||
| 126 | BigEndian &= Idx == bigEndianByteAt(Width, MemOffset); | |||
| 127 | if (!BigEndian && !LittleEndian) | |||
| 128 | return std::nullopt; | |||
| 129 | } | |||
| 130 | ||||
| 131 | assert((BigEndian != LittleEndian) &&(static_cast <bool> ((BigEndian != LittleEndian) && "Pattern cannot be both big and little endian!") ? void (0) : __assert_fail ("(BigEndian != LittleEndian) && \"Pattern cannot be both big and little endian!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 132, __extension__ __PRETTY_FUNCTION__)) | |||
| 132 | "Pattern cannot be both big and little endian!")(static_cast <bool> ((BigEndian != LittleEndian) && "Pattern cannot be both big and little endian!") ? void (0) : __assert_fail ("(BigEndian != LittleEndian) && \"Pattern cannot be both big and little endian!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 132, __extension__ __PRETTY_FUNCTION__)); | |||
| 133 | return BigEndian; | |||
| 134 | } | |||
| 135 | ||||
| 136 | bool CombinerHelper::isPreLegalize() const { return IsPreLegalize; } | |||
| 137 | ||||
| 138 | bool CombinerHelper::isLegal(const LegalityQuery &Query) const { | |||
| 139 | assert(LI && "Must have LegalizerInfo to query isLegal!")(static_cast <bool> (LI && "Must have LegalizerInfo to query isLegal!" ) ? void (0) : __assert_fail ("LI && \"Must have LegalizerInfo to query isLegal!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 139, __extension__ __PRETTY_FUNCTION__)); | |||
| 140 | return LI->getAction(Query).Action == LegalizeActions::Legal; | |||
| 141 | } | |||
| 142 | ||||
| 143 | bool CombinerHelper::isLegalOrBeforeLegalizer( | |||
| 144 | const LegalityQuery &Query) const { | |||
| 145 | return isPreLegalize() || isLegal(Query); | |||
| 146 | } | |||
| 147 | ||||
| 148 | bool CombinerHelper::isConstantLegalOrBeforeLegalizer(const LLT Ty) const { | |||
| 149 | if (!Ty.isVector()) | |||
| 150 | return isLegalOrBeforeLegalizer({TargetOpcode::G_CONSTANT, {Ty}}); | |||
| 151 | // Vector constants are represented as a G_BUILD_VECTOR of scalar G_CONSTANTs. | |||
| 152 | if (isPreLegalize()) | |||
| 153 | return true; | |||
| 154 | LLT EltTy = Ty.getElementType(); | |||
| 155 | return isLegal({TargetOpcode::G_BUILD_VECTOR, {Ty, EltTy}}) && | |||
| 156 | isLegal({TargetOpcode::G_CONSTANT, {EltTy}}); | |||
| 157 | } | |||
| 158 | ||||
| 159 | void CombinerHelper::replaceRegWith(MachineRegisterInfo &MRI, Register FromReg, | |||
| 160 | Register ToReg) const { | |||
| 161 | Observer.changingAllUsesOfReg(MRI, FromReg); | |||
| 162 | ||||
| 163 | if (MRI.constrainRegAttrs(ToReg, FromReg)) | |||
| 164 | MRI.replaceRegWith(FromReg, ToReg); | |||
| 165 | else | |||
| 166 | Builder.buildCopy(ToReg, FromReg); | |||
| 167 | ||||
| 168 | Observer.finishedChangingAllUsesOfReg(); | |||
| 169 | } | |||
| 170 | ||||
| 171 | void CombinerHelper::replaceRegOpWith(MachineRegisterInfo &MRI, | |||
| 172 | MachineOperand &FromRegOp, | |||
| 173 | Register ToReg) const { | |||
| 174 | assert(FromRegOp.getParent() && "Expected an operand in an MI")(static_cast <bool> (FromRegOp.getParent() && "Expected an operand in an MI" ) ? void (0) : __assert_fail ("FromRegOp.getParent() && \"Expected an operand in an MI\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 174, __extension__ __PRETTY_FUNCTION__)); | |||
| 175 | Observer.changingInstr(*FromRegOp.getParent()); | |||
| 176 | ||||
| 177 | FromRegOp.setReg(ToReg); | |||
| 178 | ||||
| 179 | Observer.changedInstr(*FromRegOp.getParent()); | |||
| 180 | } | |||
| 181 | ||||
| 182 | void CombinerHelper::replaceOpcodeWith(MachineInstr &FromMI, | |||
| 183 | unsigned ToOpcode) const { | |||
| 184 | Observer.changingInstr(FromMI); | |||
| 185 | ||||
| 186 | FromMI.setDesc(Builder.getTII().get(ToOpcode)); | |||
| 187 | ||||
| 188 | Observer.changedInstr(FromMI); | |||
| 189 | } | |||
| 190 | ||||
| 191 | const RegisterBank *CombinerHelper::getRegBank(Register Reg) const { | |||
| 192 | return RBI->getRegBank(Reg, MRI, *TRI); | |||
| 193 | } | |||
| 194 | ||||
| 195 | void CombinerHelper::setRegBank(Register Reg, const RegisterBank *RegBank) { | |||
| 196 | if (RegBank) | |||
| 197 | MRI.setRegBank(Reg, *RegBank); | |||
| 198 | } | |||
| 199 | ||||
| 200 | bool CombinerHelper::tryCombineCopy(MachineInstr &MI) { | |||
| 201 | if (matchCombineCopy(MI)) { | |||
| 202 | applyCombineCopy(MI); | |||
| 203 | return true; | |||
| 204 | } | |||
| 205 | return false; | |||
| 206 | } | |||
| 207 | bool CombinerHelper::matchCombineCopy(MachineInstr &MI) { | |||
| 208 | if (MI.getOpcode() != TargetOpcode::COPY) | |||
| 209 | return false; | |||
| 210 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 211 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 212 | return canReplaceReg(DstReg, SrcReg, MRI); | |||
| 213 | } | |||
| 214 | void CombinerHelper::applyCombineCopy(MachineInstr &MI) { | |||
| 215 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 216 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 217 | MI.eraseFromParent(); | |||
| 218 | replaceRegWith(MRI, DstReg, SrcReg); | |||
| 219 | } | |||
| 220 | ||||
| 221 | bool CombinerHelper::tryCombineConcatVectors(MachineInstr &MI) { | |||
| 222 | bool IsUndef = false; | |||
| 223 | SmallVector<Register, 4> Ops; | |||
| 224 | if (matchCombineConcatVectors(MI, IsUndef, Ops)) { | |||
| 225 | applyCombineConcatVectors(MI, IsUndef, Ops); | |||
| 226 | return true; | |||
| 227 | } | |||
| 228 | return false; | |||
| 229 | } | |||
| 230 | ||||
| 231 | bool CombinerHelper::matchCombineConcatVectors(MachineInstr &MI, bool &IsUndef, | |||
| 232 | SmallVectorImpl<Register> &Ops) { | |||
| 233 | assert(MI.getOpcode() == TargetOpcode::G_CONCAT_VECTORS &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_CONCAT_VECTORS && "Invalid instruction") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_CONCAT_VECTORS && \"Invalid instruction\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 234, __extension__ __PRETTY_FUNCTION__)) | |||
| 234 | "Invalid instruction")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_CONCAT_VECTORS && "Invalid instruction") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_CONCAT_VECTORS && \"Invalid instruction\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 234, __extension__ __PRETTY_FUNCTION__)); | |||
| 235 | IsUndef = true; | |||
| 236 | MachineInstr *Undef = nullptr; | |||
| 237 | ||||
| 238 | // Walk over all the operands of concat vectors and check if they are | |||
| 239 | // build_vector themselves or undef. | |||
| 240 | // Then collect their operands in Ops. | |||
| 241 | for (const MachineOperand &MO : MI.uses()) { | |||
| 242 | Register Reg = MO.getReg(); | |||
| 243 | MachineInstr *Def = MRI.getVRegDef(Reg); | |||
| 244 | assert(Def && "Operand not defined")(static_cast <bool> (Def && "Operand not defined" ) ? void (0) : __assert_fail ("Def && \"Operand not defined\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 244, __extension__ __PRETTY_FUNCTION__)); | |||
| 245 | switch (Def->getOpcode()) { | |||
| 246 | case TargetOpcode::G_BUILD_VECTOR: | |||
| 247 | IsUndef = false; | |||
| 248 | // Remember the operands of the build_vector to fold | |||
| 249 | // them into the yet-to-build flattened concat vectors. | |||
| 250 | for (const MachineOperand &BuildVecMO : Def->uses()) | |||
| 251 | Ops.push_back(BuildVecMO.getReg()); | |||
| 252 | break; | |||
| 253 | case TargetOpcode::G_IMPLICIT_DEF: { | |||
| 254 | LLT OpType = MRI.getType(Reg); | |||
| 255 | // Keep one undef value for all the undef operands. | |||
| 256 | if (!Undef) { | |||
| 257 | Builder.setInsertPt(*MI.getParent(), MI); | |||
| 258 | Undef = Builder.buildUndef(OpType.getScalarType()); | |||
| 259 | } | |||
| 260 | assert(MRI.getType(Undef->getOperand(0).getReg()) ==(static_cast <bool> (MRI.getType(Undef->getOperand(0 ).getReg()) == OpType.getScalarType() && "All undefs should have the same type" ) ? void (0) : __assert_fail ("MRI.getType(Undef->getOperand(0).getReg()) == OpType.getScalarType() && \"All undefs should have the same type\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 262, __extension__ __PRETTY_FUNCTION__)) | |||
| 261 | OpType.getScalarType() &&(static_cast <bool> (MRI.getType(Undef->getOperand(0 ).getReg()) == OpType.getScalarType() && "All undefs should have the same type" ) ? void (0) : __assert_fail ("MRI.getType(Undef->getOperand(0).getReg()) == OpType.getScalarType() && \"All undefs should have the same type\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 262, __extension__ __PRETTY_FUNCTION__)) | |||
| 262 | "All undefs should have the same type")(static_cast <bool> (MRI.getType(Undef->getOperand(0 ).getReg()) == OpType.getScalarType() && "All undefs should have the same type" ) ? void (0) : __assert_fail ("MRI.getType(Undef->getOperand(0).getReg()) == OpType.getScalarType() && \"All undefs should have the same type\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 262, __extension__ __PRETTY_FUNCTION__)); | |||
| 263 | // Break the undef vector in as many scalar elements as needed | |||
| 264 | // for the flattening. | |||
| 265 | for (unsigned EltIdx = 0, EltEnd = OpType.getNumElements(); | |||
| 266 | EltIdx != EltEnd; ++EltIdx) | |||
| 267 | Ops.push_back(Undef->getOperand(0).getReg()); | |||
| 268 | break; | |||
| 269 | } | |||
| 270 | default: | |||
| 271 | return false; | |||
| 272 | } | |||
| 273 | } | |||
| 274 | return true; | |||
| 275 | } | |||
| 276 | void CombinerHelper::applyCombineConcatVectors( | |||
| 277 | MachineInstr &MI, bool IsUndef, const ArrayRef<Register> Ops) { | |||
| 278 | // We determined that the concat_vectors can be flatten. | |||
| 279 | // Generate the flattened build_vector. | |||
| 280 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 281 | Builder.setInsertPt(*MI.getParent(), MI); | |||
| 282 | Register NewDstReg = MRI.cloneVirtualRegister(DstReg); | |||
| 283 | ||||
| 284 | // Note: IsUndef is sort of redundant. We could have determine it by | |||
| 285 | // checking that at all Ops are undef. Alternatively, we could have | |||
| 286 | // generate a build_vector of undefs and rely on another combine to | |||
| 287 | // clean that up. For now, given we already gather this information | |||
| 288 | // in tryCombineConcatVectors, just save compile time and issue the | |||
| 289 | // right thing. | |||
| 290 | if (IsUndef) | |||
| 291 | Builder.buildUndef(NewDstReg); | |||
| 292 | else | |||
| 293 | Builder.buildBuildVector(NewDstReg, Ops); | |||
| 294 | MI.eraseFromParent(); | |||
| 295 | replaceRegWith(MRI, DstReg, NewDstReg); | |||
| 296 | } | |||
| 297 | ||||
| 298 | bool CombinerHelper::tryCombineShuffleVector(MachineInstr &MI) { | |||
| 299 | SmallVector<Register, 4> Ops; | |||
| 300 | if (matchCombineShuffleVector(MI, Ops)) { | |||
| 301 | applyCombineShuffleVector(MI, Ops); | |||
| 302 | return true; | |||
| 303 | } | |||
| 304 | return false; | |||
| 305 | } | |||
| 306 | ||||
| 307 | bool CombinerHelper::matchCombineShuffleVector(MachineInstr &MI, | |||
| 308 | SmallVectorImpl<Register> &Ops) { | |||
| 309 | assert(MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR && "Invalid instruction kind") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR && \"Invalid instruction kind\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 310, __extension__ __PRETTY_FUNCTION__)) | |||
| 310 | "Invalid instruction kind")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR && "Invalid instruction kind") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR && \"Invalid instruction kind\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 310, __extension__ __PRETTY_FUNCTION__)); | |||
| 311 | LLT DstType = MRI.getType(MI.getOperand(0).getReg()); | |||
| 312 | Register Src1 = MI.getOperand(1).getReg(); | |||
| 313 | LLT SrcType = MRI.getType(Src1); | |||
| 314 | // As bizarre as it may look, shuffle vector can actually produce | |||
| 315 | // scalar! This is because at the IR level a <1 x ty> shuffle | |||
| 316 | // vector is perfectly valid. | |||
| 317 | unsigned DstNumElts = DstType.isVector() ? DstType.getNumElements() : 1; | |||
| 318 | unsigned SrcNumElts = SrcType.isVector() ? SrcType.getNumElements() : 1; | |||
| 319 | ||||
| 320 | // If the resulting vector is smaller than the size of the source | |||
| 321 | // vectors being concatenated, we won't be able to replace the | |||
| 322 | // shuffle vector into a concat_vectors. | |||
| 323 | // | |||
| 324 | // Note: We may still be able to produce a concat_vectors fed by | |||
| 325 | // extract_vector_elt and so on. It is less clear that would | |||
| 326 | // be better though, so don't bother for now. | |||
| 327 | // | |||
| 328 | // If the destination is a scalar, the size of the sources doesn't | |||
| 329 | // matter. we will lower the shuffle to a plain copy. This will | |||
| 330 | // work only if the source and destination have the same size. But | |||
| 331 | // that's covered by the next condition. | |||
| 332 | // | |||
| 333 | // TODO: If the size between the source and destination don't match | |||
| 334 | // we could still emit an extract vector element in that case. | |||
| 335 | if (DstNumElts < 2 * SrcNumElts && DstNumElts != 1) | |||
| 336 | return false; | |||
| 337 | ||||
| 338 | // Check that the shuffle mask can be broken evenly between the | |||
| 339 | // different sources. | |||
| 340 | if (DstNumElts % SrcNumElts != 0) | |||
| 341 | return false; | |||
| 342 | ||||
| 343 | // Mask length is a multiple of the source vector length. | |||
| 344 | // Check if the shuffle is some kind of concatenation of the input | |||
| 345 | // vectors. | |||
| 346 | unsigned NumConcat = DstNumElts / SrcNumElts; | |||
| 347 | SmallVector<int, 8> ConcatSrcs(NumConcat, -1); | |||
| 348 | ArrayRef<int> Mask = MI.getOperand(3).getShuffleMask(); | |||
| 349 | for (unsigned i = 0; i != DstNumElts; ++i) { | |||
| 350 | int Idx = Mask[i]; | |||
| 351 | // Undef value. | |||
| 352 | if (Idx < 0) | |||
| 353 | continue; | |||
| 354 | // Ensure the indices in each SrcType sized piece are sequential and that | |||
| 355 | // the same source is used for the whole piece. | |||
| 356 | if ((Idx % SrcNumElts != (i % SrcNumElts)) || | |||
| 357 | (ConcatSrcs[i / SrcNumElts] >= 0 && | |||
| 358 | ConcatSrcs[i / SrcNumElts] != (int)(Idx / SrcNumElts))) | |||
| 359 | return false; | |||
| 360 | // Remember which source this index came from. | |||
| 361 | ConcatSrcs[i / SrcNumElts] = Idx / SrcNumElts; | |||
| 362 | } | |||
| 363 | ||||
| 364 | // The shuffle is concatenating multiple vectors together. | |||
| 365 | // Collect the different operands for that. | |||
| 366 | Register UndefReg; | |||
| 367 | Register Src2 = MI.getOperand(2).getReg(); | |||
| 368 | for (auto Src : ConcatSrcs) { | |||
| 369 | if (Src < 0) { | |||
| 370 | if (!UndefReg) { | |||
| 371 | Builder.setInsertPt(*MI.getParent(), MI); | |||
| 372 | UndefReg = Builder.buildUndef(SrcType).getReg(0); | |||
| 373 | } | |||
| 374 | Ops.push_back(UndefReg); | |||
| 375 | } else if (Src == 0) | |||
| 376 | Ops.push_back(Src1); | |||
| 377 | else | |||
| 378 | Ops.push_back(Src2); | |||
| 379 | } | |||
| 380 | return true; | |||
| 381 | } | |||
| 382 | ||||
| 383 | void CombinerHelper::applyCombineShuffleVector(MachineInstr &MI, | |||
| 384 | const ArrayRef<Register> Ops) { | |||
| 385 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 386 | Builder.setInsertPt(*MI.getParent(), MI); | |||
| 387 | Register NewDstReg = MRI.cloneVirtualRegister(DstReg); | |||
| 388 | ||||
| 389 | if (Ops.size() == 1) | |||
| 390 | Builder.buildCopy(NewDstReg, Ops[0]); | |||
| 391 | else | |||
| 392 | Builder.buildMergeLikeInstr(NewDstReg, Ops); | |||
| 393 | ||||
| 394 | MI.eraseFromParent(); | |||
| 395 | replaceRegWith(MRI, DstReg, NewDstReg); | |||
| 396 | } | |||
| 397 | ||||
| 398 | namespace { | |||
| 399 | ||||
| 400 | /// Select a preference between two uses. CurrentUse is the current preference | |||
| 401 | /// while *ForCandidate is attributes of the candidate under consideration. | |||
| 402 | PreferredTuple ChoosePreferredUse(MachineInstr &LoadMI, | |||
| 403 | PreferredTuple &CurrentUse, | |||
| 404 | const LLT TyForCandidate, | |||
| 405 | unsigned OpcodeForCandidate, | |||
| 406 | MachineInstr *MIForCandidate) { | |||
| 407 | if (!CurrentUse.Ty.isValid()) { | |||
| 408 | if (CurrentUse.ExtendOpcode == OpcodeForCandidate || | |||
| 409 | CurrentUse.ExtendOpcode == TargetOpcode::G_ANYEXT) | |||
| 410 | return {TyForCandidate, OpcodeForCandidate, MIForCandidate}; | |||
| 411 | return CurrentUse; | |||
| 412 | } | |||
| 413 | ||||
| 414 | // We permit the extend to hoist through basic blocks but this is only | |||
| 415 | // sensible if the target has extending loads. If you end up lowering back | |||
| 416 | // into a load and extend during the legalizer then the end result is | |||
| 417 | // hoisting the extend up to the load. | |||
| 418 | ||||
| 419 | // Prefer defined extensions to undefined extensions as these are more | |||
| 420 | // likely to reduce the number of instructions. | |||
| 421 | if (OpcodeForCandidate == TargetOpcode::G_ANYEXT && | |||
| 422 | CurrentUse.ExtendOpcode != TargetOpcode::G_ANYEXT) | |||
| 423 | return CurrentUse; | |||
| 424 | else if (CurrentUse.ExtendOpcode == TargetOpcode::G_ANYEXT && | |||
| 425 | OpcodeForCandidate != TargetOpcode::G_ANYEXT) | |||
| 426 | return {TyForCandidate, OpcodeForCandidate, MIForCandidate}; | |||
| 427 | ||||
| 428 | // Prefer sign extensions to zero extensions as sign-extensions tend to be | |||
| 429 | // more expensive. Don't do this if the load is already a zero-extend load | |||
| 430 | // though, otherwise we'll rewrite a zero-extend load into a sign-extend | |||
| 431 | // later. | |||
| 432 | if (!isa<GZExtLoad>(LoadMI) && CurrentUse.Ty == TyForCandidate) { | |||
| 433 | if (CurrentUse.ExtendOpcode == TargetOpcode::G_SEXT && | |||
| 434 | OpcodeForCandidate == TargetOpcode::G_ZEXT) | |||
| 435 | return CurrentUse; | |||
| 436 | else if (CurrentUse.ExtendOpcode == TargetOpcode::G_ZEXT && | |||
| 437 | OpcodeForCandidate == TargetOpcode::G_SEXT) | |||
| 438 | return {TyForCandidate, OpcodeForCandidate, MIForCandidate}; | |||
| 439 | } | |||
| 440 | ||||
| 441 | // This is potentially target specific. We've chosen the largest type | |||
| 442 | // because G_TRUNC is usually free. One potential catch with this is that | |||
| 443 | // some targets have a reduced number of larger registers than smaller | |||
| 444 | // registers and this choice potentially increases the live-range for the | |||
| 445 | // larger value. | |||
| 446 | if (TyForCandidate.getSizeInBits() > CurrentUse.Ty.getSizeInBits()) { | |||
| 447 | return {TyForCandidate, OpcodeForCandidate, MIForCandidate}; | |||
| 448 | } | |||
| 449 | return CurrentUse; | |||
| 450 | } | |||
| 451 | ||||
| 452 | /// Find a suitable place to insert some instructions and insert them. This | |||
| 453 | /// function accounts for special cases like inserting before a PHI node. | |||
| 454 | /// The current strategy for inserting before PHI's is to duplicate the | |||
| 455 | /// instructions for each predecessor. However, while that's ok for G_TRUNC | |||
| 456 | /// on most targets since it generally requires no code, other targets/cases may | |||
| 457 | /// want to try harder to find a dominating block. | |||
| 458 | static void InsertInsnsWithoutSideEffectsBeforeUse( | |||
| 459 | MachineIRBuilder &Builder, MachineInstr &DefMI, MachineOperand &UseMO, | |||
| 460 | std::function<void(MachineBasicBlock *, MachineBasicBlock::iterator, | |||
| 461 | MachineOperand &UseMO)> | |||
| 462 | Inserter) { | |||
| 463 | MachineInstr &UseMI = *UseMO.getParent(); | |||
| 464 | ||||
| 465 | MachineBasicBlock *InsertBB = UseMI.getParent(); | |||
| 466 | ||||
| 467 | // If the use is a PHI then we want the predecessor block instead. | |||
| 468 | if (UseMI.isPHI()) { | |||
| 469 | MachineOperand *PredBB = std::next(&UseMO); | |||
| 470 | InsertBB = PredBB->getMBB(); | |||
| 471 | } | |||
| 472 | ||||
| 473 | // If the block is the same block as the def then we want to insert just after | |||
| 474 | // the def instead of at the start of the block. | |||
| 475 | if (InsertBB == DefMI.getParent()) { | |||
| 476 | MachineBasicBlock::iterator InsertPt = &DefMI; | |||
| 477 | Inserter(InsertBB, std::next(InsertPt), UseMO); | |||
| 478 | return; | |||
| 479 | } | |||
| 480 | ||||
| 481 | // Otherwise we want the start of the BB | |||
| 482 | Inserter(InsertBB, InsertBB->getFirstNonPHI(), UseMO); | |||
| 483 | } | |||
| 484 | } // end anonymous namespace | |||
| 485 | ||||
| 486 | bool CombinerHelper::tryCombineExtendingLoads(MachineInstr &MI) { | |||
| 487 | PreferredTuple Preferred; | |||
| 488 | if (matchCombineExtendingLoads(MI, Preferred)) { | |||
| 489 | applyCombineExtendingLoads(MI, Preferred); | |||
| 490 | return true; | |||
| 491 | } | |||
| 492 | return false; | |||
| 493 | } | |||
| 494 | ||||
| 495 | static unsigned getExtLoadOpcForExtend(unsigned ExtOpc) { | |||
| 496 | unsigned CandidateLoadOpc; | |||
| 497 | switch (ExtOpc) { | |||
| 498 | case TargetOpcode::G_ANYEXT: | |||
| 499 | CandidateLoadOpc = TargetOpcode::G_LOAD; | |||
| 500 | break; | |||
| 501 | case TargetOpcode::G_SEXT: | |||
| 502 | CandidateLoadOpc = TargetOpcode::G_SEXTLOAD; | |||
| 503 | break; | |||
| 504 | case TargetOpcode::G_ZEXT: | |||
| 505 | CandidateLoadOpc = TargetOpcode::G_ZEXTLOAD; | |||
| 506 | break; | |||
| 507 | default: | |||
| 508 | llvm_unreachable("Unexpected extend opc")::llvm::llvm_unreachable_internal("Unexpected extend opc", "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp" , 508); | |||
| 509 | } | |||
| 510 | return CandidateLoadOpc; | |||
| 511 | } | |||
| 512 | ||||
| 513 | bool CombinerHelper::matchCombineExtendingLoads(MachineInstr &MI, | |||
| 514 | PreferredTuple &Preferred) { | |||
| 515 | // We match the loads and follow the uses to the extend instead of matching | |||
| 516 | // the extends and following the def to the load. This is because the load | |||
| 517 | // must remain in the same position for correctness (unless we also add code | |||
| 518 | // to find a safe place to sink it) whereas the extend is freely movable. | |||
| 519 | // It also prevents us from duplicating the load for the volatile case or just | |||
| 520 | // for performance. | |||
| 521 | GAnyLoad *LoadMI = dyn_cast<GAnyLoad>(&MI); | |||
| 522 | if (!LoadMI) | |||
| 523 | return false; | |||
| 524 | ||||
| 525 | Register LoadReg = LoadMI->getDstReg(); | |||
| 526 | ||||
| 527 | LLT LoadValueTy = MRI.getType(LoadReg); | |||
| 528 | if (!LoadValueTy.isScalar()) | |||
| 529 | return false; | |||
| 530 | ||||
| 531 | // Most architectures are going to legalize <s8 loads into at least a 1 byte | |||
| 532 | // load, and the MMOs can only describe memory accesses in multiples of bytes. | |||
| 533 | // If we try to perform extload combining on those, we can end up with | |||
| 534 | // %a(s8) = extload %ptr (load 1 byte from %ptr) | |||
| 535 | // ... which is an illegal extload instruction. | |||
| 536 | if (LoadValueTy.getSizeInBits() < 8) | |||
| 537 | return false; | |||
| 538 | ||||
| 539 | // For non power-of-2 types, they will very likely be legalized into multiple | |||
| 540 | // loads. Don't bother trying to match them into extending loads. | |||
| 541 | if (!llvm::has_single_bit<uint32_t>(LoadValueTy.getSizeInBits())) | |||
| 542 | return false; | |||
| 543 | ||||
| 544 | // Find the preferred type aside from the any-extends (unless it's the only | |||
| 545 | // one) and non-extending ops. We'll emit an extending load to that type and | |||
| 546 | // and emit a variant of (extend (trunc X)) for the others according to the | |||
| 547 | // relative type sizes. At the same time, pick an extend to use based on the | |||
| 548 | // extend involved in the chosen type. | |||
| 549 | unsigned PreferredOpcode = | |||
| 550 | isa<GLoad>(&MI) | |||
| 551 | ? TargetOpcode::G_ANYEXT | |||
| 552 | : isa<GSExtLoad>(&MI) ? TargetOpcode::G_SEXT : TargetOpcode::G_ZEXT; | |||
| 553 | Preferred = {LLT(), PreferredOpcode, nullptr}; | |||
| 554 | for (auto &UseMI : MRI.use_nodbg_instructions(LoadReg)) { | |||
| 555 | if (UseMI.getOpcode() == TargetOpcode::G_SEXT || | |||
| 556 | UseMI.getOpcode() == TargetOpcode::G_ZEXT || | |||
| 557 | (UseMI.getOpcode() == TargetOpcode::G_ANYEXT)) { | |||
| 558 | const auto &MMO = LoadMI->getMMO(); | |||
| 559 | // For atomics, only form anyextending loads. | |||
| 560 | if (MMO.isAtomic() && UseMI.getOpcode() != TargetOpcode::G_ANYEXT) | |||
| 561 | continue; | |||
| 562 | // Check for legality. | |||
| 563 | if (!isPreLegalize()) { | |||
| 564 | LegalityQuery::MemDesc MMDesc(MMO); | |||
| 565 | unsigned CandidateLoadOpc = getExtLoadOpcForExtend(UseMI.getOpcode()); | |||
| 566 | LLT UseTy = MRI.getType(UseMI.getOperand(0).getReg()); | |||
| 567 | LLT SrcTy = MRI.getType(LoadMI->getPointerReg()); | |||
| 568 | if (LI->getAction({CandidateLoadOpc, {UseTy, SrcTy}, {MMDesc}}) | |||
| 569 | .Action != LegalizeActions::Legal) | |||
| 570 | continue; | |||
| 571 | } | |||
| 572 | Preferred = ChoosePreferredUse(MI, Preferred, | |||
| 573 | MRI.getType(UseMI.getOperand(0).getReg()), | |||
| 574 | UseMI.getOpcode(), &UseMI); | |||
| 575 | } | |||
| 576 | } | |||
| 577 | ||||
| 578 | // There were no extends | |||
| 579 | if (!Preferred.MI) | |||
| 580 | return false; | |||
| 581 | // It should be impossible to chose an extend without selecting a different | |||
| 582 | // type since by definition the result of an extend is larger. | |||
| 583 | assert(Preferred.Ty != LoadValueTy && "Extending to same type?")(static_cast <bool> (Preferred.Ty != LoadValueTy && "Extending to same type?") ? void (0) : __assert_fail ("Preferred.Ty != LoadValueTy && \"Extending to same type?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 583, __extension__ __PRETTY_FUNCTION__)); | |||
| 584 | ||||
| 585 | LLVM_DEBUG(dbgs() << "Preferred use is: " << *Preferred.MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << "Preferred use is: " << *Preferred.MI; } } while (false); | |||
| 586 | return true; | |||
| 587 | } | |||
| 588 | ||||
| 589 | void CombinerHelper::applyCombineExtendingLoads(MachineInstr &MI, | |||
| 590 | PreferredTuple &Preferred) { | |||
| 591 | // Rewrite the load to the chosen extending load. | |||
| 592 | Register ChosenDstReg = Preferred.MI->getOperand(0).getReg(); | |||
| 593 | ||||
| 594 | // Inserter to insert a truncate back to the original type at a given point | |||
| 595 | // with some basic CSE to limit truncate duplication to one per BB. | |||
| 596 | DenseMap<MachineBasicBlock *, MachineInstr *> EmittedInsns; | |||
| 597 | auto InsertTruncAt = [&](MachineBasicBlock *InsertIntoBB, | |||
| 598 | MachineBasicBlock::iterator InsertBefore, | |||
| 599 | MachineOperand &UseMO) { | |||
| 600 | MachineInstr *PreviouslyEmitted = EmittedInsns.lookup(InsertIntoBB); | |||
| 601 | if (PreviouslyEmitted) { | |||
| 602 | Observer.changingInstr(*UseMO.getParent()); | |||
| 603 | UseMO.setReg(PreviouslyEmitted->getOperand(0).getReg()); | |||
| 604 | Observer.changedInstr(*UseMO.getParent()); | |||
| 605 | return; | |||
| 606 | } | |||
| 607 | ||||
| 608 | Builder.setInsertPt(*InsertIntoBB, InsertBefore); | |||
| 609 | Register NewDstReg = MRI.cloneVirtualRegister(MI.getOperand(0).getReg()); | |||
| 610 | MachineInstr *NewMI = Builder.buildTrunc(NewDstReg, ChosenDstReg); | |||
| 611 | EmittedInsns[InsertIntoBB] = NewMI; | |||
| 612 | replaceRegOpWith(MRI, UseMO, NewDstReg); | |||
| 613 | }; | |||
| 614 | ||||
| 615 | Observer.changingInstr(MI); | |||
| 616 | unsigned LoadOpc = getExtLoadOpcForExtend(Preferred.ExtendOpcode); | |||
| 617 | MI.setDesc(Builder.getTII().get(LoadOpc)); | |||
| 618 | ||||
| 619 | // Rewrite all the uses to fix up the types. | |||
| 620 | auto &LoadValue = MI.getOperand(0); | |||
| 621 | SmallVector<MachineOperand *, 4> Uses; | |||
| 622 | for (auto &UseMO : MRI.use_operands(LoadValue.getReg())) | |||
| 623 | Uses.push_back(&UseMO); | |||
| 624 | ||||
| 625 | for (auto *UseMO : Uses) { | |||
| 626 | MachineInstr *UseMI = UseMO->getParent(); | |||
| 627 | ||||
| 628 | // If the extend is compatible with the preferred extend then we should fix | |||
| 629 | // up the type and extend so that it uses the preferred use. | |||
| 630 | if (UseMI->getOpcode() == Preferred.ExtendOpcode || | |||
| 631 | UseMI->getOpcode() == TargetOpcode::G_ANYEXT) { | |||
| 632 | Register UseDstReg = UseMI->getOperand(0).getReg(); | |||
| 633 | MachineOperand &UseSrcMO = UseMI->getOperand(1); | |||
| 634 | const LLT UseDstTy = MRI.getType(UseDstReg); | |||
| 635 | if (UseDstReg != ChosenDstReg) { | |||
| 636 | if (Preferred.Ty == UseDstTy) { | |||
| 637 | // If the use has the same type as the preferred use, then merge | |||
| 638 | // the vregs and erase the extend. For example: | |||
| 639 | // %1:_(s8) = G_LOAD ... | |||
| 640 | // %2:_(s32) = G_SEXT %1(s8) | |||
| 641 | // %3:_(s32) = G_ANYEXT %1(s8) | |||
| 642 | // ... = ... %3(s32) | |||
| 643 | // rewrites to: | |||
| 644 | // %2:_(s32) = G_SEXTLOAD ... | |||
| 645 | // ... = ... %2(s32) | |||
| 646 | replaceRegWith(MRI, UseDstReg, ChosenDstReg); | |||
| 647 | Observer.erasingInstr(*UseMO->getParent()); | |||
| 648 | UseMO->getParent()->eraseFromParent(); | |||
| 649 | } else if (Preferred.Ty.getSizeInBits() < UseDstTy.getSizeInBits()) { | |||
| 650 | // If the preferred size is smaller, then keep the extend but extend | |||
| 651 | // from the result of the extending load. For example: | |||
| 652 | // %1:_(s8) = G_LOAD ... | |||
| 653 | // %2:_(s32) = G_SEXT %1(s8) | |||
| 654 | // %3:_(s64) = G_ANYEXT %1(s8) | |||
| 655 | // ... = ... %3(s64) | |||
| 656 | /// rewrites to: | |||
| 657 | // %2:_(s32) = G_SEXTLOAD ... | |||
| 658 | // %3:_(s64) = G_ANYEXT %2:_(s32) | |||
| 659 | // ... = ... %3(s64) | |||
| 660 | replaceRegOpWith(MRI, UseSrcMO, ChosenDstReg); | |||
| 661 | } else { | |||
| 662 | // If the preferred size is large, then insert a truncate. For | |||
| 663 | // example: | |||
| 664 | // %1:_(s8) = G_LOAD ... | |||
| 665 | // %2:_(s64) = G_SEXT %1(s8) | |||
| 666 | // %3:_(s32) = G_ZEXT %1(s8) | |||
| 667 | // ... = ... %3(s32) | |||
| 668 | /// rewrites to: | |||
| 669 | // %2:_(s64) = G_SEXTLOAD ... | |||
| 670 | // %4:_(s8) = G_TRUNC %2:_(s32) | |||
| 671 | // %3:_(s64) = G_ZEXT %2:_(s8) | |||
| 672 | // ... = ... %3(s64) | |||
| 673 | InsertInsnsWithoutSideEffectsBeforeUse(Builder, MI, *UseMO, | |||
| 674 | InsertTruncAt); | |||
| 675 | } | |||
| 676 | continue; | |||
| 677 | } | |||
| 678 | // The use is (one of) the uses of the preferred use we chose earlier. | |||
| 679 | // We're going to update the load to def this value later so just erase | |||
| 680 | // the old extend. | |||
| 681 | Observer.erasingInstr(*UseMO->getParent()); | |||
| 682 | UseMO->getParent()->eraseFromParent(); | |||
| 683 | continue; | |||
| 684 | } | |||
| 685 | ||||
| 686 | // The use isn't an extend. Truncate back to the type we originally loaded. | |||
| 687 | // This is free on many targets. | |||
| 688 | InsertInsnsWithoutSideEffectsBeforeUse(Builder, MI, *UseMO, InsertTruncAt); | |||
| 689 | } | |||
| 690 | ||||
| 691 | MI.getOperand(0).setReg(ChosenDstReg); | |||
| 692 | Observer.changedInstr(MI); | |||
| 693 | } | |||
| 694 | ||||
| 695 | bool CombinerHelper::matchCombineLoadWithAndMask(MachineInstr &MI, | |||
| 696 | BuildFnTy &MatchInfo) { | |||
| 697 | assert(MI.getOpcode() == TargetOpcode::G_AND)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_AND ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_AND" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 697, __extension__ __PRETTY_FUNCTION__)); | |||
| 698 | ||||
| 699 | // If we have the following code: | |||
| 700 | // %mask = G_CONSTANT 255 | |||
| 701 | // %ld = G_LOAD %ptr, (load s16) | |||
| 702 | // %and = G_AND %ld, %mask | |||
| 703 | // | |||
| 704 | // Try to fold it into | |||
| 705 | // %ld = G_ZEXTLOAD %ptr, (load s8) | |||
| 706 | ||||
| 707 | Register Dst = MI.getOperand(0).getReg(); | |||
| 708 | if (MRI.getType(Dst).isVector()) | |||
| 709 | return false; | |||
| 710 | ||||
| 711 | auto MaybeMask = | |||
| 712 | getIConstantVRegValWithLookThrough(MI.getOperand(2).getReg(), MRI); | |||
| 713 | if (!MaybeMask) | |||
| 714 | return false; | |||
| 715 | ||||
| 716 | APInt MaskVal = MaybeMask->Value; | |||
| 717 | ||||
| 718 | if (!MaskVal.isMask()) | |||
| 719 | return false; | |||
| 720 | ||||
| 721 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 722 | // Don't use getOpcodeDef() here since intermediate instructions may have | |||
| 723 | // multiple users. | |||
| 724 | GAnyLoad *LoadMI = dyn_cast<GAnyLoad>(MRI.getVRegDef(SrcReg)); | |||
| 725 | if (!LoadMI || !MRI.hasOneNonDBGUse(LoadMI->getDstReg())) | |||
| 726 | return false; | |||
| 727 | ||||
| 728 | Register LoadReg = LoadMI->getDstReg(); | |||
| 729 | LLT RegTy = MRI.getType(LoadReg); | |||
| 730 | Register PtrReg = LoadMI->getPointerReg(); | |||
| 731 | unsigned RegSize = RegTy.getSizeInBits(); | |||
| 732 | uint64_t LoadSizeBits = LoadMI->getMemSizeInBits(); | |||
| 733 | unsigned MaskSizeBits = MaskVal.countr_one(); | |||
| 734 | ||||
| 735 | // The mask may not be larger than the in-memory type, as it might cover sign | |||
| 736 | // extended bits | |||
| 737 | if (MaskSizeBits > LoadSizeBits) | |||
| 738 | return false; | |||
| 739 | ||||
| 740 | // If the mask covers the whole destination register, there's nothing to | |||
| 741 | // extend | |||
| 742 | if (MaskSizeBits >= RegSize) | |||
| 743 | return false; | |||
| 744 | ||||
| 745 | // Most targets cannot deal with loads of size < 8 and need to re-legalize to | |||
| 746 | // at least byte loads. Avoid creating such loads here | |||
| 747 | if (MaskSizeBits < 8 || !isPowerOf2_32(MaskSizeBits)) | |||
| 748 | return false; | |||
| 749 | ||||
| 750 | const MachineMemOperand &MMO = LoadMI->getMMO(); | |||
| 751 | LegalityQuery::MemDesc MemDesc(MMO); | |||
| 752 | ||||
| 753 | // Don't modify the memory access size if this is atomic/volatile, but we can | |||
| 754 | // still adjust the opcode to indicate the high bit behavior. | |||
| 755 | if (LoadMI->isSimple()) | |||
| 756 | MemDesc.MemoryTy = LLT::scalar(MaskSizeBits); | |||
| 757 | else if (LoadSizeBits > MaskSizeBits || LoadSizeBits == RegSize) | |||
| 758 | return false; | |||
| 759 | ||||
| 760 | // TODO: Could check if it's legal with the reduced or original memory size. | |||
| 761 | if (!isLegalOrBeforeLegalizer( | |||
| 762 | {TargetOpcode::G_ZEXTLOAD, {RegTy, MRI.getType(PtrReg)}, {MemDesc}})) | |||
| 763 | return false; | |||
| 764 | ||||
| 765 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 766 | B.setInstrAndDebugLoc(*LoadMI); | |||
| 767 | auto &MF = B.getMF(); | |||
| 768 | auto PtrInfo = MMO.getPointerInfo(); | |||
| 769 | auto *NewMMO = MF.getMachineMemOperand(&MMO, PtrInfo, MemDesc.MemoryTy); | |||
| 770 | B.buildLoadInstr(TargetOpcode::G_ZEXTLOAD, Dst, PtrReg, *NewMMO); | |||
| 771 | LoadMI->eraseFromParent(); | |||
| 772 | }; | |||
| 773 | return true; | |||
| 774 | } | |||
| 775 | ||||
| 776 | bool CombinerHelper::isPredecessor(const MachineInstr &DefMI, | |||
| 777 | const MachineInstr &UseMI) { | |||
| 778 | assert(!DefMI.isDebugInstr() && !UseMI.isDebugInstr() &&(static_cast <bool> (!DefMI.isDebugInstr() && ! UseMI.isDebugInstr() && "shouldn't consider debug uses" ) ? void (0) : __assert_fail ("!DefMI.isDebugInstr() && !UseMI.isDebugInstr() && \"shouldn't consider debug uses\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 779, __extension__ __PRETTY_FUNCTION__)) | |||
| 779 | "shouldn't consider debug uses")(static_cast <bool> (!DefMI.isDebugInstr() && ! UseMI.isDebugInstr() && "shouldn't consider debug uses" ) ? void (0) : __assert_fail ("!DefMI.isDebugInstr() && !UseMI.isDebugInstr() && \"shouldn't consider debug uses\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 779, __extension__ __PRETTY_FUNCTION__)); | |||
| 780 | assert(DefMI.getParent() == UseMI.getParent())(static_cast <bool> (DefMI.getParent() == UseMI.getParent ()) ? void (0) : __assert_fail ("DefMI.getParent() == UseMI.getParent()" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 780, __extension__ __PRETTY_FUNCTION__)); | |||
| 781 | if (&DefMI == &UseMI) | |||
| 782 | return true; | |||
| 783 | const MachineBasicBlock &MBB = *DefMI.getParent(); | |||
| 784 | auto DefOrUse = find_if(MBB, [&DefMI, &UseMI](const MachineInstr &MI) { | |||
| 785 | return &MI == &DefMI || &MI == &UseMI; | |||
| 786 | }); | |||
| 787 | if (DefOrUse == MBB.end()) | |||
| 788 | llvm_unreachable("Block must contain both DefMI and UseMI!")::llvm::llvm_unreachable_internal("Block must contain both DefMI and UseMI!" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 788); | |||
| 789 | return &*DefOrUse == &DefMI; | |||
| 790 | } | |||
| 791 | ||||
| 792 | bool CombinerHelper::dominates(const MachineInstr &DefMI, | |||
| 793 | const MachineInstr &UseMI) { | |||
| 794 | assert(!DefMI.isDebugInstr() && !UseMI.isDebugInstr() &&(static_cast <bool> (!DefMI.isDebugInstr() && ! UseMI.isDebugInstr() && "shouldn't consider debug uses" ) ? void (0) : __assert_fail ("!DefMI.isDebugInstr() && !UseMI.isDebugInstr() && \"shouldn't consider debug uses\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 795, __extension__ __PRETTY_FUNCTION__)) | |||
| 795 | "shouldn't consider debug uses")(static_cast <bool> (!DefMI.isDebugInstr() && ! UseMI.isDebugInstr() && "shouldn't consider debug uses" ) ? void (0) : __assert_fail ("!DefMI.isDebugInstr() && !UseMI.isDebugInstr() && \"shouldn't consider debug uses\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 795, __extension__ __PRETTY_FUNCTION__)); | |||
| 796 | if (MDT) | |||
| 797 | return MDT->dominates(&DefMI, &UseMI); | |||
| 798 | else if (DefMI.getParent() != UseMI.getParent()) | |||
| 799 | return false; | |||
| 800 | ||||
| 801 | return isPredecessor(DefMI, UseMI); | |||
| 802 | } | |||
| 803 | ||||
| 804 | bool CombinerHelper::matchSextTruncSextLoad(MachineInstr &MI) { | |||
| 805 | assert(MI.getOpcode() == TargetOpcode::G_SEXT_INREG)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SEXT_INREG ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SEXT_INREG" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 805, __extension__ __PRETTY_FUNCTION__)); | |||
| 806 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 807 | Register LoadUser = SrcReg; | |||
| 808 | ||||
| 809 | if (MRI.getType(SrcReg).isVector()) | |||
| 810 | return false; | |||
| 811 | ||||
| 812 | Register TruncSrc; | |||
| 813 | if (mi_match(SrcReg, MRI, m_GTrunc(m_Reg(TruncSrc)))) | |||
| 814 | LoadUser = TruncSrc; | |||
| 815 | ||||
| 816 | uint64_t SizeInBits = MI.getOperand(2).getImm(); | |||
| 817 | // If the source is a G_SEXTLOAD from the same bit width, then we don't | |||
| 818 | // need any extend at all, just a truncate. | |||
| 819 | if (auto *LoadMI = getOpcodeDef<GSExtLoad>(LoadUser, MRI)) { | |||
| 820 | // If truncating more than the original extended value, abort. | |||
| 821 | auto LoadSizeBits = LoadMI->getMemSizeInBits(); | |||
| 822 | if (TruncSrc && MRI.getType(TruncSrc).getSizeInBits() < LoadSizeBits) | |||
| 823 | return false; | |||
| 824 | if (LoadSizeBits == SizeInBits) | |||
| 825 | return true; | |||
| 826 | } | |||
| 827 | return false; | |||
| 828 | } | |||
| 829 | ||||
| 830 | void CombinerHelper::applySextTruncSextLoad(MachineInstr &MI) { | |||
| 831 | assert(MI.getOpcode() == TargetOpcode::G_SEXT_INREG)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SEXT_INREG ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SEXT_INREG" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 831, __extension__ __PRETTY_FUNCTION__)); | |||
| 832 | Builder.setInstrAndDebugLoc(MI); | |||
| 833 | Builder.buildCopy(MI.getOperand(0).getReg(), MI.getOperand(1).getReg()); | |||
| 834 | MI.eraseFromParent(); | |||
| 835 | } | |||
| 836 | ||||
| 837 | bool CombinerHelper::matchSextInRegOfLoad( | |||
| 838 | MachineInstr &MI, std::tuple<Register, unsigned> &MatchInfo) { | |||
| 839 | assert(MI.getOpcode() == TargetOpcode::G_SEXT_INREG)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SEXT_INREG ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SEXT_INREG" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 839, __extension__ __PRETTY_FUNCTION__)); | |||
| 840 | ||||
| 841 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 842 | LLT RegTy = MRI.getType(DstReg); | |||
| 843 | ||||
| 844 | // Only supports scalars for now. | |||
| 845 | if (RegTy.isVector()) | |||
| 846 | return false; | |||
| 847 | ||||
| 848 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 849 | auto *LoadDef = getOpcodeDef<GLoad>(SrcReg, MRI); | |||
| 850 | if (!LoadDef || !MRI.hasOneNonDBGUse(DstReg)) | |||
| 851 | return false; | |||
| 852 | ||||
| 853 | uint64_t MemBits = LoadDef->getMemSizeInBits(); | |||
| 854 | ||||
| 855 | // If the sign extend extends from a narrower width than the load's width, | |||
| 856 | // then we can narrow the load width when we combine to a G_SEXTLOAD. | |||
| 857 | // Avoid widening the load at all. | |||
| 858 | unsigned NewSizeBits = std::min((uint64_t)MI.getOperand(2).getImm(), MemBits); | |||
| 859 | ||||
| 860 | // Don't generate G_SEXTLOADs with a < 1 byte width. | |||
| 861 | if (NewSizeBits < 8) | |||
| 862 | return false; | |||
| 863 | // Don't bother creating a non-power-2 sextload, it will likely be broken up | |||
| 864 | // anyway for most targets. | |||
| 865 | if (!isPowerOf2_32(NewSizeBits)) | |||
| 866 | return false; | |||
| 867 | ||||
| 868 | const MachineMemOperand &MMO = LoadDef->getMMO(); | |||
| 869 | LegalityQuery::MemDesc MMDesc(MMO); | |||
| 870 | ||||
| 871 | // Don't modify the memory access size if this is atomic/volatile, but we can | |||
| 872 | // still adjust the opcode to indicate the high bit behavior. | |||
| 873 | if (LoadDef->isSimple()) | |||
| 874 | MMDesc.MemoryTy = LLT::scalar(NewSizeBits); | |||
| 875 | else if (MemBits > NewSizeBits || MemBits == RegTy.getSizeInBits()) | |||
| 876 | return false; | |||
| 877 | ||||
| 878 | // TODO: Could check if it's legal with the reduced or original memory size. | |||
| 879 | if (!isLegalOrBeforeLegalizer({TargetOpcode::G_SEXTLOAD, | |||
| 880 | {MRI.getType(LoadDef->getDstReg()), | |||
| 881 | MRI.getType(LoadDef->getPointerReg())}, | |||
| 882 | {MMDesc}})) | |||
| 883 | return false; | |||
| 884 | ||||
| 885 | MatchInfo = std::make_tuple(LoadDef->getDstReg(), NewSizeBits); | |||
| 886 | return true; | |||
| 887 | } | |||
| 888 | ||||
| 889 | void CombinerHelper::applySextInRegOfLoad( | |||
| 890 | MachineInstr &MI, std::tuple<Register, unsigned> &MatchInfo) { | |||
| 891 | assert(MI.getOpcode() == TargetOpcode::G_SEXT_INREG)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SEXT_INREG ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SEXT_INREG" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 891, __extension__ __PRETTY_FUNCTION__)); | |||
| 892 | Register LoadReg; | |||
| 893 | unsigned ScalarSizeBits; | |||
| 894 | std::tie(LoadReg, ScalarSizeBits) = MatchInfo; | |||
| 895 | GLoad *LoadDef = cast<GLoad>(MRI.getVRegDef(LoadReg)); | |||
| 896 | ||||
| 897 | // If we have the following: | |||
| 898 | // %ld = G_LOAD %ptr, (load 2) | |||
| 899 | // %ext = G_SEXT_INREG %ld, 8 | |||
| 900 | // ==> | |||
| 901 | // %ld = G_SEXTLOAD %ptr (load 1) | |||
| 902 | ||||
| 903 | auto &MMO = LoadDef->getMMO(); | |||
| 904 | Builder.setInstrAndDebugLoc(*LoadDef); | |||
| 905 | auto &MF = Builder.getMF(); | |||
| 906 | auto PtrInfo = MMO.getPointerInfo(); | |||
| 907 | auto *NewMMO = MF.getMachineMemOperand(&MMO, PtrInfo, ScalarSizeBits / 8); | |||
| 908 | Builder.buildLoadInstr(TargetOpcode::G_SEXTLOAD, MI.getOperand(0).getReg(), | |||
| 909 | LoadDef->getPointerReg(), *NewMMO); | |||
| 910 | MI.eraseFromParent(); | |||
| 911 | } | |||
| 912 | ||||
| 913 | bool CombinerHelper::findPostIndexCandidate(MachineInstr &MI, Register &Addr, | |||
| 914 | Register &Base, Register &Offset) { | |||
| 915 | auto &MF = *MI.getParent()->getParent(); | |||
| 916 | const auto &TLI = *MF.getSubtarget().getTargetLowering(); | |||
| 917 | ||||
| 918 | #ifndef NDEBUG | |||
| 919 | unsigned Opcode = MI.getOpcode(); | |||
| 920 | assert(Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD ||(static_cast <bool> (Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE) ? void (0) : __assert_fail ("Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 921, __extension__ __PRETTY_FUNCTION__)) | |||
| 921 | Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE)(static_cast <bool> (Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE) ? void (0) : __assert_fail ("Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 921, __extension__ __PRETTY_FUNCTION__)); | |||
| 922 | #endif | |||
| 923 | ||||
| 924 | Base = MI.getOperand(1).getReg(); | |||
| 925 | MachineInstr *BaseDef = MRI.getUniqueVRegDef(Base); | |||
| 926 | if (BaseDef && BaseDef->getOpcode() == TargetOpcode::G_FRAME_INDEX) | |||
| 927 | return false; | |||
| 928 | ||||
| 929 | LLVM_DEBUG(dbgs() << "Searching for post-indexing opportunity for: " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << "Searching for post-indexing opportunity for: " << MI; } } while (false); | |||
| 930 | // FIXME: The following use traversal needs a bail out for patholigical cases. | |||
| 931 | for (auto &Use : MRI.use_nodbg_instructions(Base)) { | |||
| 932 | if (Use.getOpcode() != TargetOpcode::G_PTR_ADD) | |||
| 933 | continue; | |||
| 934 | ||||
| 935 | Offset = Use.getOperand(2).getReg(); | |||
| 936 | if (!ForceLegalIndexing && | |||
| 937 | !TLI.isIndexingLegal(MI, Base, Offset, /*IsPre*/ false, MRI)) { | |||
| 938 | LLVM_DEBUG(dbgs() << " Ignoring candidate with illegal addrmode: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Ignoring candidate with illegal addrmode: " << Use; } } while (false) | |||
| 939 | << Use)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Ignoring candidate with illegal addrmode: " << Use; } } while (false); | |||
| 940 | continue; | |||
| 941 | } | |||
| 942 | ||||
| 943 | // Make sure the offset calculation is before the potentially indexed op. | |||
| 944 | // FIXME: we really care about dependency here. The offset calculation might | |||
| 945 | // be movable. | |||
| 946 | MachineInstr *OffsetDef = MRI.getUniqueVRegDef(Offset); | |||
| 947 | if (!OffsetDef || !dominates(*OffsetDef, MI)) { | |||
| 948 | LLVM_DEBUG(dbgs() << " Ignoring candidate with offset after mem-op: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Ignoring candidate with offset after mem-op: " << Use; } } while (false) | |||
| 949 | << Use)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Ignoring candidate with offset after mem-op: " << Use; } } while (false); | |||
| 950 | continue; | |||
| 951 | } | |||
| 952 | ||||
| 953 | // FIXME: check whether all uses of Base are load/store with foldable | |||
| 954 | // addressing modes. If so, using the normal addr-modes is better than | |||
| 955 | // forming an indexed one. | |||
| 956 | ||||
| 957 | bool MemOpDominatesAddrUses = true; | |||
| 958 | for (auto &PtrAddUse : | |||
| 959 | MRI.use_nodbg_instructions(Use.getOperand(0).getReg())) { | |||
| 960 | if (!dominates(MI, PtrAddUse)) { | |||
| 961 | MemOpDominatesAddrUses = false; | |||
| 962 | break; | |||
| 963 | } | |||
| 964 | } | |||
| 965 | ||||
| 966 | if (!MemOpDominatesAddrUses) { | |||
| 967 | LLVM_DEBUG(do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Ignoring candidate as memop does not dominate uses: " << Use; } } while (false) | |||
| 968 | dbgs() << " Ignoring candidate as memop does not dominate uses: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Ignoring candidate as memop does not dominate uses: " << Use; } } while (false) | |||
| 969 | << Use)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Ignoring candidate as memop does not dominate uses: " << Use; } } while (false); | |||
| 970 | continue; | |||
| 971 | } | |||
| 972 | ||||
| 973 | LLVM_DEBUG(dbgs() << " Found match: " << Use)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Found match: " << Use; } } while (false); | |||
| 974 | Addr = Use.getOperand(0).getReg(); | |||
| 975 | return true; | |||
| 976 | } | |||
| 977 | ||||
| 978 | return false; | |||
| 979 | } | |||
| 980 | ||||
| 981 | bool CombinerHelper::findPreIndexCandidate(MachineInstr &MI, Register &Addr, | |||
| 982 | Register &Base, Register &Offset) { | |||
| 983 | auto &MF = *MI.getParent()->getParent(); | |||
| 984 | const auto &TLI = *MF.getSubtarget().getTargetLowering(); | |||
| 985 | ||||
| 986 | #ifndef NDEBUG | |||
| 987 | unsigned Opcode = MI.getOpcode(); | |||
| 988 | assert(Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD ||(static_cast <bool> (Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE) ? void (0) : __assert_fail ("Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 989, __extension__ __PRETTY_FUNCTION__)) | |||
| 989 | Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE)(static_cast <bool> (Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE) ? void (0) : __assert_fail ("Opcode == TargetOpcode::G_LOAD || Opcode == TargetOpcode::G_SEXTLOAD || Opcode == TargetOpcode::G_ZEXTLOAD || Opcode == TargetOpcode::G_STORE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 989, __extension__ __PRETTY_FUNCTION__)); | |||
| 990 | #endif | |||
| 991 | ||||
| 992 | Addr = MI.getOperand(1).getReg(); | |||
| 993 | MachineInstr *AddrDef = getOpcodeDef(TargetOpcode::G_PTR_ADD, Addr, MRI); | |||
| 994 | if (!AddrDef || MRI.hasOneNonDBGUse(Addr)) | |||
| 995 | return false; | |||
| 996 | ||||
| 997 | Base = AddrDef->getOperand(1).getReg(); | |||
| 998 | Offset = AddrDef->getOperand(2).getReg(); | |||
| 999 | ||||
| 1000 | LLVM_DEBUG(dbgs() << "Found potential pre-indexed load_store: " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << "Found potential pre-indexed load_store: " << MI; } } while (false); | |||
| 1001 | ||||
| 1002 | if (!ForceLegalIndexing && | |||
| 1003 | !TLI.isIndexingLegal(MI, Base, Offset, /*IsPre*/ true, MRI)) { | |||
| 1004 | LLVM_DEBUG(dbgs() << " Skipping, not legal for target")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Skipping, not legal for target" ; } } while (false); | |||
| 1005 | return false; | |||
| 1006 | } | |||
| 1007 | ||||
| 1008 | MachineInstr *BaseDef = getDefIgnoringCopies(Base, MRI); | |||
| 1009 | if (BaseDef->getOpcode() == TargetOpcode::G_FRAME_INDEX) { | |||
| 1010 | LLVM_DEBUG(dbgs() << " Skipping, frame index would need copy anyway.")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Skipping, frame index would need copy anyway." ; } } while (false); | |||
| 1011 | return false; | |||
| 1012 | } | |||
| 1013 | ||||
| 1014 | if (MI.getOpcode() == TargetOpcode::G_STORE) { | |||
| 1015 | // Would require a copy. | |||
| 1016 | if (Base == MI.getOperand(0).getReg()) { | |||
| 1017 | LLVM_DEBUG(dbgs() << " Skipping, storing base so need copy anyway.")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Skipping, storing base so need copy anyway." ; } } while (false); | |||
| 1018 | return false; | |||
| 1019 | } | |||
| 1020 | ||||
| 1021 | // We're expecting one use of Addr in MI, but it could also be the | |||
| 1022 | // value stored, which isn't actually dominated by the instruction. | |||
| 1023 | if (MI.getOperand(0).getReg() == Addr) { | |||
| 1024 | LLVM_DEBUG(dbgs() << " Skipping, does not dominate all addr uses")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Skipping, does not dominate all addr uses" ; } } while (false); | |||
| 1025 | return false; | |||
| 1026 | } | |||
| 1027 | } | |||
| 1028 | ||||
| 1029 | // FIXME: check whether all uses of the base pointer are constant PtrAdds. | |||
| 1030 | // That might allow us to end base's liveness here by adjusting the constant. | |||
| 1031 | ||||
| 1032 | for (auto &UseMI : MRI.use_nodbg_instructions(Addr)) { | |||
| 1033 | if (!dominates(MI, UseMI)) { | |||
| 1034 | LLVM_DEBUG(dbgs() << " Skipping, does not dominate all addr uses.")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Skipping, does not dominate all addr uses." ; } } while (false); | |||
| 1035 | return false; | |||
| 1036 | } | |||
| 1037 | } | |||
| 1038 | ||||
| 1039 | return true; | |||
| 1040 | } | |||
| 1041 | ||||
| 1042 | bool CombinerHelper::tryCombineIndexedLoadStore(MachineInstr &MI) { | |||
| 1043 | IndexedLoadStoreMatchInfo MatchInfo; | |||
| 1044 | if (matchCombineIndexedLoadStore(MI, MatchInfo)) { | |||
| 1045 | applyCombineIndexedLoadStore(MI, MatchInfo); | |||
| 1046 | return true; | |||
| 1047 | } | |||
| 1048 | return false; | |||
| 1049 | } | |||
| 1050 | ||||
| 1051 | bool CombinerHelper::matchCombineIndexedLoadStore(MachineInstr &MI, IndexedLoadStoreMatchInfo &MatchInfo) { | |||
| 1052 | unsigned Opcode = MI.getOpcode(); | |||
| 1053 | if (Opcode != TargetOpcode::G_LOAD && Opcode != TargetOpcode::G_SEXTLOAD && | |||
| 1054 | Opcode != TargetOpcode::G_ZEXTLOAD && Opcode != TargetOpcode::G_STORE) | |||
| 1055 | return false; | |||
| 1056 | ||||
| 1057 | // For now, no targets actually support these opcodes so don't waste time | |||
| 1058 | // running these unless we're forced to for testing. | |||
| 1059 | if (!ForceLegalIndexing) | |||
| 1060 | return false; | |||
| 1061 | ||||
| 1062 | MatchInfo.IsPre = findPreIndexCandidate(MI, MatchInfo.Addr, MatchInfo.Base, | |||
| 1063 | MatchInfo.Offset); | |||
| 1064 | if (!MatchInfo.IsPre && | |||
| 1065 | !findPostIndexCandidate(MI, MatchInfo.Addr, MatchInfo.Base, | |||
| 1066 | MatchInfo.Offset)) | |||
| 1067 | return false; | |||
| 1068 | ||||
| 1069 | return true; | |||
| 1070 | } | |||
| 1071 | ||||
| 1072 | void CombinerHelper::applyCombineIndexedLoadStore( | |||
| 1073 | MachineInstr &MI, IndexedLoadStoreMatchInfo &MatchInfo) { | |||
| 1074 | MachineInstr &AddrDef = *MRI.getUniqueVRegDef(MatchInfo.Addr); | |||
| 1075 | MachineIRBuilder MIRBuilder(MI); | |||
| 1076 | unsigned Opcode = MI.getOpcode(); | |||
| 1077 | bool IsStore = Opcode == TargetOpcode::G_STORE; | |||
| 1078 | unsigned NewOpcode; | |||
| 1079 | switch (Opcode) { | |||
| 1080 | case TargetOpcode::G_LOAD: | |||
| 1081 | NewOpcode = TargetOpcode::G_INDEXED_LOAD; | |||
| 1082 | break; | |||
| 1083 | case TargetOpcode::G_SEXTLOAD: | |||
| 1084 | NewOpcode = TargetOpcode::G_INDEXED_SEXTLOAD; | |||
| 1085 | break; | |||
| 1086 | case TargetOpcode::G_ZEXTLOAD: | |||
| 1087 | NewOpcode = TargetOpcode::G_INDEXED_ZEXTLOAD; | |||
| 1088 | break; | |||
| 1089 | case TargetOpcode::G_STORE: | |||
| 1090 | NewOpcode = TargetOpcode::G_INDEXED_STORE; | |||
| 1091 | break; | |||
| 1092 | default: | |||
| 1093 | llvm_unreachable("Unknown load/store opcode")::llvm::llvm_unreachable_internal("Unknown load/store opcode" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1093); | |||
| 1094 | } | |||
| 1095 | ||||
| 1096 | auto MIB = MIRBuilder.buildInstr(NewOpcode); | |||
| 1097 | if (IsStore) { | |||
| 1098 | MIB.addDef(MatchInfo.Addr); | |||
| 1099 | MIB.addUse(MI.getOperand(0).getReg()); | |||
| 1100 | } else { | |||
| 1101 | MIB.addDef(MI.getOperand(0).getReg()); | |||
| 1102 | MIB.addDef(MatchInfo.Addr); | |||
| 1103 | } | |||
| 1104 | ||||
| 1105 | MIB.addUse(MatchInfo.Base); | |||
| 1106 | MIB.addUse(MatchInfo.Offset); | |||
| 1107 | MIB.addImm(MatchInfo.IsPre); | |||
| 1108 | MI.eraseFromParent(); | |||
| 1109 | AddrDef.eraseFromParent(); | |||
| 1110 | ||||
| 1111 | LLVM_DEBUG(dbgs() << " Combinined to indexed operation")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("gi-combiner")) { dbgs() << " Combinined to indexed operation" ; } } while (false); | |||
| 1112 | } | |||
| 1113 | ||||
| 1114 | bool CombinerHelper::matchCombineDivRem(MachineInstr &MI, | |||
| 1115 | MachineInstr *&OtherMI) { | |||
| 1116 | unsigned Opcode = MI.getOpcode(); | |||
| 1117 | bool IsDiv, IsSigned; | |||
| 1118 | ||||
| 1119 | switch (Opcode) { | |||
| 1120 | default: | |||
| 1121 | llvm_unreachable("Unexpected opcode!")::llvm::llvm_unreachable_internal("Unexpected opcode!", "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp" , 1121); | |||
| 1122 | case TargetOpcode::G_SDIV: | |||
| 1123 | case TargetOpcode::G_UDIV: { | |||
| 1124 | IsDiv = true; | |||
| 1125 | IsSigned = Opcode == TargetOpcode::G_SDIV; | |||
| 1126 | break; | |||
| 1127 | } | |||
| 1128 | case TargetOpcode::G_SREM: | |||
| 1129 | case TargetOpcode::G_UREM: { | |||
| 1130 | IsDiv = false; | |||
| 1131 | IsSigned = Opcode == TargetOpcode::G_SREM; | |||
| 1132 | break; | |||
| 1133 | } | |||
| 1134 | } | |||
| 1135 | ||||
| 1136 | Register Src1 = MI.getOperand(1).getReg(); | |||
| 1137 | unsigned DivOpcode, RemOpcode, DivremOpcode; | |||
| 1138 | if (IsSigned) { | |||
| 1139 | DivOpcode = TargetOpcode::G_SDIV; | |||
| 1140 | RemOpcode = TargetOpcode::G_SREM; | |||
| 1141 | DivremOpcode = TargetOpcode::G_SDIVREM; | |||
| 1142 | } else { | |||
| 1143 | DivOpcode = TargetOpcode::G_UDIV; | |||
| 1144 | RemOpcode = TargetOpcode::G_UREM; | |||
| 1145 | DivremOpcode = TargetOpcode::G_UDIVREM; | |||
| 1146 | } | |||
| 1147 | ||||
| 1148 | if (!isLegalOrBeforeLegalizer({DivremOpcode, {MRI.getType(Src1)}})) | |||
| 1149 | return false; | |||
| 1150 | ||||
| 1151 | // Combine: | |||
| 1152 | // %div:_ = G_[SU]DIV %src1:_, %src2:_ | |||
| 1153 | // %rem:_ = G_[SU]REM %src1:_, %src2:_ | |||
| 1154 | // into: | |||
| 1155 | // %div:_, %rem:_ = G_[SU]DIVREM %src1:_, %src2:_ | |||
| 1156 | ||||
| 1157 | // Combine: | |||
| 1158 | // %rem:_ = G_[SU]REM %src1:_, %src2:_ | |||
| 1159 | // %div:_ = G_[SU]DIV %src1:_, %src2:_ | |||
| 1160 | // into: | |||
| 1161 | // %div:_, %rem:_ = G_[SU]DIVREM %src1:_, %src2:_ | |||
| 1162 | ||||
| 1163 | for (auto &UseMI : MRI.use_nodbg_instructions(Src1)) { | |||
| 1164 | if (MI.getParent() == UseMI.getParent() && | |||
| 1165 | ((IsDiv && UseMI.getOpcode() == RemOpcode) || | |||
| 1166 | (!IsDiv && UseMI.getOpcode() == DivOpcode)) && | |||
| 1167 | matchEqualDefs(MI.getOperand(2), UseMI.getOperand(2)) && | |||
| 1168 | matchEqualDefs(MI.getOperand(1), UseMI.getOperand(1))) { | |||
| 1169 | OtherMI = &UseMI; | |||
| 1170 | return true; | |||
| 1171 | } | |||
| 1172 | } | |||
| 1173 | ||||
| 1174 | return false; | |||
| 1175 | } | |||
| 1176 | ||||
| 1177 | void CombinerHelper::applyCombineDivRem(MachineInstr &MI, | |||
| 1178 | MachineInstr *&OtherMI) { | |||
| 1179 | unsigned Opcode = MI.getOpcode(); | |||
| 1180 | assert(OtherMI && "OtherMI shouldn't be empty.")(static_cast <bool> (OtherMI && "OtherMI shouldn't be empty." ) ? void (0) : __assert_fail ("OtherMI && \"OtherMI shouldn't be empty.\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1180, __extension__ __PRETTY_FUNCTION__)); | |||
| 1181 | ||||
| 1182 | Register DestDivReg, DestRemReg; | |||
| 1183 | if (Opcode == TargetOpcode::G_SDIV || Opcode == TargetOpcode::G_UDIV) { | |||
| 1184 | DestDivReg = MI.getOperand(0).getReg(); | |||
| 1185 | DestRemReg = OtherMI->getOperand(0).getReg(); | |||
| 1186 | } else { | |||
| 1187 | DestDivReg = OtherMI->getOperand(0).getReg(); | |||
| 1188 | DestRemReg = MI.getOperand(0).getReg(); | |||
| 1189 | } | |||
| 1190 | ||||
| 1191 | bool IsSigned = | |||
| 1192 | Opcode == TargetOpcode::G_SDIV || Opcode == TargetOpcode::G_SREM; | |||
| 1193 | ||||
| 1194 | // Check which instruction is first in the block so we don't break def-use | |||
| 1195 | // deps by "moving" the instruction incorrectly. | |||
| 1196 | if (dominates(MI, *OtherMI)) | |||
| 1197 | Builder.setInstrAndDebugLoc(MI); | |||
| 1198 | else | |||
| 1199 | Builder.setInstrAndDebugLoc(*OtherMI); | |||
| 1200 | ||||
| 1201 | Builder.buildInstr(IsSigned ? TargetOpcode::G_SDIVREM | |||
| 1202 | : TargetOpcode::G_UDIVREM, | |||
| 1203 | {DestDivReg, DestRemReg}, | |||
| 1204 | {MI.getOperand(1).getReg(), MI.getOperand(2).getReg()}); | |||
| 1205 | MI.eraseFromParent(); | |||
| 1206 | OtherMI->eraseFromParent(); | |||
| 1207 | } | |||
| 1208 | ||||
| 1209 | bool CombinerHelper::matchOptBrCondByInvertingCond(MachineInstr &MI, | |||
| 1210 | MachineInstr *&BrCond) { | |||
| 1211 | assert(MI.getOpcode() == TargetOpcode::G_BR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_BR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_BR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1211, __extension__ __PRETTY_FUNCTION__)); | |||
| 1212 | ||||
| 1213 | // Try to match the following: | |||
| 1214 | // bb1: | |||
| 1215 | // G_BRCOND %c1, %bb2 | |||
| 1216 | // G_BR %bb3 | |||
| 1217 | // bb2: | |||
| 1218 | // ... | |||
| 1219 | // bb3: | |||
| 1220 | ||||
| 1221 | // The above pattern does not have a fall through to the successor bb2, always | |||
| 1222 | // resulting in a branch no matter which path is taken. Here we try to find | |||
| 1223 | // and replace that pattern with conditional branch to bb3 and otherwise | |||
| 1224 | // fallthrough to bb2. This is generally better for branch predictors. | |||
| 1225 | ||||
| 1226 | MachineBasicBlock *MBB = MI.getParent(); | |||
| 1227 | MachineBasicBlock::iterator BrIt(MI); | |||
| 1228 | if (BrIt == MBB->begin()) | |||
| 1229 | return false; | |||
| 1230 | assert(std::next(BrIt) == MBB->end() && "expected G_BR to be a terminator")(static_cast <bool> (std::next(BrIt) == MBB->end() && "expected G_BR to be a terminator") ? void (0) : __assert_fail ("std::next(BrIt) == MBB->end() && \"expected G_BR to be a terminator\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1230, __extension__ __PRETTY_FUNCTION__)); | |||
| 1231 | ||||
| 1232 | BrCond = &*std::prev(BrIt); | |||
| 1233 | if (BrCond->getOpcode() != TargetOpcode::G_BRCOND) | |||
| 1234 | return false; | |||
| 1235 | ||||
| 1236 | // Check that the next block is the conditional branch target. Also make sure | |||
| 1237 | // that it isn't the same as the G_BR's target (otherwise, this will loop.) | |||
| 1238 | MachineBasicBlock *BrCondTarget = BrCond->getOperand(1).getMBB(); | |||
| 1239 | return BrCondTarget != MI.getOperand(0).getMBB() && | |||
| 1240 | MBB->isLayoutSuccessor(BrCondTarget); | |||
| 1241 | } | |||
| 1242 | ||||
| 1243 | void CombinerHelper::applyOptBrCondByInvertingCond(MachineInstr &MI, | |||
| 1244 | MachineInstr *&BrCond) { | |||
| 1245 | MachineBasicBlock *BrTarget = MI.getOperand(0).getMBB(); | |||
| 1246 | Builder.setInstrAndDebugLoc(*BrCond); | |||
| 1247 | LLT Ty = MRI.getType(BrCond->getOperand(0).getReg()); | |||
| 1248 | // FIXME: Does int/fp matter for this? If so, we might need to restrict | |||
| 1249 | // this to i1 only since we might not know for sure what kind of | |||
| 1250 | // compare generated the condition value. | |||
| 1251 | auto True = Builder.buildConstant( | |||
| 1252 | Ty, getICmpTrueVal(getTargetLowering(), false, false)); | |||
| 1253 | auto Xor = Builder.buildXor(Ty, BrCond->getOperand(0), True); | |||
| 1254 | ||||
| 1255 | auto *FallthroughBB = BrCond->getOperand(1).getMBB(); | |||
| 1256 | Observer.changingInstr(MI); | |||
| 1257 | MI.getOperand(0).setMBB(FallthroughBB); | |||
| 1258 | Observer.changedInstr(MI); | |||
| 1259 | ||||
| 1260 | // Change the conditional branch to use the inverted condition and | |||
| 1261 | // new target block. | |||
| 1262 | Observer.changingInstr(*BrCond); | |||
| 1263 | BrCond->getOperand(0).setReg(Xor.getReg(0)); | |||
| 1264 | BrCond->getOperand(1).setMBB(BrTarget); | |||
| 1265 | Observer.changedInstr(*BrCond); | |||
| 1266 | } | |||
| 1267 | ||||
| 1268 | static Type *getTypeForLLT(LLT Ty, LLVMContext &C) { | |||
| 1269 | if (Ty.isVector()) | |||
| 1270 | return FixedVectorType::get(IntegerType::get(C, Ty.getScalarSizeInBits()), | |||
| 1271 | Ty.getNumElements()); | |||
| 1272 | return IntegerType::get(C, Ty.getSizeInBits()); | |||
| 1273 | } | |||
| 1274 | ||||
| 1275 | bool CombinerHelper::tryEmitMemcpyInline(MachineInstr &MI) { | |||
| 1276 | MachineIRBuilder HelperBuilder(MI); | |||
| 1277 | GISelObserverWrapper DummyObserver; | |||
| 1278 | LegalizerHelper Helper(HelperBuilder.getMF(), DummyObserver, HelperBuilder); | |||
| 1279 | return Helper.lowerMemcpyInline(MI) == | |||
| 1280 | LegalizerHelper::LegalizeResult::Legalized; | |||
| 1281 | } | |||
| 1282 | ||||
| 1283 | bool CombinerHelper::tryCombineMemCpyFamily(MachineInstr &MI, unsigned MaxLen) { | |||
| 1284 | MachineIRBuilder HelperBuilder(MI); | |||
| 1285 | GISelObserverWrapper DummyObserver; | |||
| 1286 | LegalizerHelper Helper(HelperBuilder.getMF(), DummyObserver, HelperBuilder); | |||
| 1287 | return Helper.lowerMemCpyFamily(MI, MaxLen) == | |||
| 1288 | LegalizerHelper::LegalizeResult::Legalized; | |||
| 1289 | } | |||
| 1290 | ||||
| 1291 | static std::optional<APFloat> | |||
| 1292 | constantFoldFpUnary(unsigned Opcode, LLT DstTy, const Register Op, | |||
| 1293 | const MachineRegisterInfo &MRI) { | |||
| 1294 | const ConstantFP *MaybeCst = getConstantFPVRegVal(Op, MRI); | |||
| 1295 | if (!MaybeCst) | |||
| 1296 | return std::nullopt; | |||
| 1297 | ||||
| 1298 | APFloat V = MaybeCst->getValueAPF(); | |||
| 1299 | switch (Opcode) { | |||
| 1300 | default: | |||
| 1301 | llvm_unreachable("Unexpected opcode!")::llvm::llvm_unreachable_internal("Unexpected opcode!", "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp" , 1301); | |||
| 1302 | case TargetOpcode::G_FNEG: { | |||
| 1303 | V.changeSign(); | |||
| 1304 | return V; | |||
| 1305 | } | |||
| 1306 | case TargetOpcode::G_FABS: { | |||
| 1307 | V.clearSign(); | |||
| 1308 | return V; | |||
| 1309 | } | |||
| 1310 | case TargetOpcode::G_FPTRUNC: | |||
| 1311 | break; | |||
| 1312 | case TargetOpcode::G_FSQRT: { | |||
| 1313 | bool Unused; | |||
| 1314 | V.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven, &Unused); | |||
| 1315 | V = APFloat(sqrt(V.convertToDouble())); | |||
| 1316 | break; | |||
| 1317 | } | |||
| 1318 | case TargetOpcode::G_FLOG2: { | |||
| 1319 | bool Unused; | |||
| 1320 | V.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven, &Unused); | |||
| 1321 | V = APFloat(log2(V.convertToDouble())); | |||
| 1322 | break; | |||
| 1323 | } | |||
| 1324 | } | |||
| 1325 | // Convert `APFloat` to appropriate IEEE type depending on `DstTy`. Otherwise, | |||
| 1326 | // `buildFConstant` will assert on size mismatch. Only `G_FPTRUNC`, `G_FSQRT`, | |||
| 1327 | // and `G_FLOG2` reach here. | |||
| 1328 | bool Unused; | |||
| 1329 | V.convert(getFltSemanticForLLT(DstTy), APFloat::rmNearestTiesToEven, &Unused); | |||
| 1330 | return V; | |||
| 1331 | } | |||
| 1332 | ||||
| 1333 | bool CombinerHelper::matchCombineConstantFoldFpUnary( | |||
| 1334 | MachineInstr &MI, std::optional<APFloat> &Cst) { | |||
| 1335 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 1336 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 1337 | LLT DstTy = MRI.getType(DstReg); | |||
| 1338 | Cst = constantFoldFpUnary(MI.getOpcode(), DstTy, SrcReg, MRI); | |||
| 1339 | return Cst.has_value(); | |||
| 1340 | } | |||
| 1341 | ||||
| 1342 | void CombinerHelper::applyCombineConstantFoldFpUnary( | |||
| 1343 | MachineInstr &MI, std::optional<APFloat> &Cst) { | |||
| 1344 | assert(Cst && "Optional is unexpectedly empty!")(static_cast <bool> (Cst && "Optional is unexpectedly empty!" ) ? void (0) : __assert_fail ("Cst && \"Optional is unexpectedly empty!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1344, __extension__ __PRETTY_FUNCTION__)); | |||
| 1345 | Builder.setInstrAndDebugLoc(MI); | |||
| 1346 | MachineFunction &MF = Builder.getMF(); | |||
| 1347 | auto *FPVal = ConstantFP::get(MF.getFunction().getContext(), *Cst); | |||
| 1348 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 1349 | Builder.buildFConstant(DstReg, *FPVal); | |||
| 1350 | MI.eraseFromParent(); | |||
| 1351 | } | |||
| 1352 | ||||
| 1353 | bool CombinerHelper::matchPtrAddImmedChain(MachineInstr &MI, | |||
| 1354 | PtrAddChain &MatchInfo) { | |||
| 1355 | // We're trying to match the following pattern: | |||
| 1356 | // %t1 = G_PTR_ADD %base, G_CONSTANT imm1 | |||
| 1357 | // %root = G_PTR_ADD %t1, G_CONSTANT imm2 | |||
| 1358 | // --> | |||
| 1359 | // %root = G_PTR_ADD %base, G_CONSTANT (imm1 + imm2) | |||
| 1360 | ||||
| 1361 | if (MI.getOpcode() != TargetOpcode::G_PTR_ADD) | |||
| 1362 | return false; | |||
| 1363 | ||||
| 1364 | Register Add2 = MI.getOperand(1).getReg(); | |||
| 1365 | Register Imm1 = MI.getOperand(2).getReg(); | |||
| 1366 | auto MaybeImmVal = getIConstantVRegValWithLookThrough(Imm1, MRI); | |||
| 1367 | if (!MaybeImmVal) | |||
| 1368 | return false; | |||
| 1369 | ||||
| 1370 | MachineInstr *Add2Def = MRI.getVRegDef(Add2); | |||
| 1371 | if (!Add2Def || Add2Def->getOpcode() != TargetOpcode::G_PTR_ADD) | |||
| 1372 | return false; | |||
| 1373 | ||||
| 1374 | Register Base = Add2Def->getOperand(1).getReg(); | |||
| 1375 | Register Imm2 = Add2Def->getOperand(2).getReg(); | |||
| 1376 | auto MaybeImm2Val = getIConstantVRegValWithLookThrough(Imm2, MRI); | |||
| 1377 | if (!MaybeImm2Val) | |||
| 1378 | return false; | |||
| 1379 | ||||
| 1380 | // Check if the new combined immediate forms an illegal addressing mode. | |||
| 1381 | // Do not combine if it was legal before but would get illegal. | |||
| 1382 | // To do so, we need to find a load/store user of the pointer to get | |||
| 1383 | // the access type. | |||
| 1384 | Type *AccessTy = nullptr; | |||
| 1385 | auto &MF = *MI.getMF(); | |||
| 1386 | for (auto &UseMI : MRI.use_nodbg_instructions(MI.getOperand(0).getReg())) { | |||
| 1387 | if (auto *LdSt = dyn_cast<GLoadStore>(&UseMI)) { | |||
| 1388 | AccessTy = getTypeForLLT(MRI.getType(LdSt->getReg(0)), | |||
| 1389 | MF.getFunction().getContext()); | |||
| 1390 | break; | |||
| 1391 | } | |||
| 1392 | } | |||
| 1393 | TargetLoweringBase::AddrMode AMNew; | |||
| 1394 | APInt CombinedImm = MaybeImmVal->Value + MaybeImm2Val->Value; | |||
| 1395 | AMNew.BaseOffs = CombinedImm.getSExtValue(); | |||
| 1396 | if (AccessTy) { | |||
| 1397 | AMNew.HasBaseReg = true; | |||
| 1398 | TargetLoweringBase::AddrMode AMOld; | |||
| 1399 | AMOld.BaseOffs = MaybeImm2Val->Value.getSExtValue(); | |||
| 1400 | AMOld.HasBaseReg = true; | |||
| 1401 | unsigned AS = MRI.getType(Add2).getAddressSpace(); | |||
| 1402 | const auto &TLI = *MF.getSubtarget().getTargetLowering(); | |||
| 1403 | if (TLI.isLegalAddressingMode(MF.getDataLayout(), AMOld, AccessTy, AS) && | |||
| 1404 | !TLI.isLegalAddressingMode(MF.getDataLayout(), AMNew, AccessTy, AS)) | |||
| 1405 | return false; | |||
| 1406 | } | |||
| 1407 | ||||
| 1408 | // Pass the combined immediate to the apply function. | |||
| 1409 | MatchInfo.Imm = AMNew.BaseOffs; | |||
| 1410 | MatchInfo.Base = Base; | |||
| 1411 | MatchInfo.Bank = getRegBank(Imm2); | |||
| 1412 | return true; | |||
| 1413 | } | |||
| 1414 | ||||
| 1415 | void CombinerHelper::applyPtrAddImmedChain(MachineInstr &MI, | |||
| 1416 | PtrAddChain &MatchInfo) { | |||
| 1417 | assert(MI.getOpcode() == TargetOpcode::G_PTR_ADD && "Expected G_PTR_ADD")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_PTR_ADD && "Expected G_PTR_ADD") ? void (0) : __assert_fail ( "MI.getOpcode() == TargetOpcode::G_PTR_ADD && \"Expected G_PTR_ADD\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1417, __extension__ __PRETTY_FUNCTION__)); | |||
| 1418 | MachineIRBuilder MIB(MI); | |||
| 1419 | LLT OffsetTy = MRI.getType(MI.getOperand(2).getReg()); | |||
| 1420 | auto NewOffset = MIB.buildConstant(OffsetTy, MatchInfo.Imm); | |||
| 1421 | setRegBank(NewOffset.getReg(0), MatchInfo.Bank); | |||
| 1422 | Observer.changingInstr(MI); | |||
| 1423 | MI.getOperand(1).setReg(MatchInfo.Base); | |||
| 1424 | MI.getOperand(2).setReg(NewOffset.getReg(0)); | |||
| 1425 | Observer.changedInstr(MI); | |||
| 1426 | } | |||
| 1427 | ||||
| 1428 | bool CombinerHelper::matchShiftImmedChain(MachineInstr &MI, | |||
| 1429 | RegisterImmPair &MatchInfo) { | |||
| 1430 | // We're trying to match the following pattern with any of | |||
| 1431 | // G_SHL/G_ASHR/G_LSHR/G_SSHLSAT/G_USHLSAT shift instructions: | |||
| 1432 | // %t1 = SHIFT %base, G_CONSTANT imm1 | |||
| 1433 | // %root = SHIFT %t1, G_CONSTANT imm2 | |||
| 1434 | // --> | |||
| 1435 | // %root = SHIFT %base, G_CONSTANT (imm1 + imm2) | |||
| 1436 | ||||
| 1437 | unsigned Opcode = MI.getOpcode(); | |||
| 1438 | assert((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR ||(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1441, __extension__ __PRETTY_FUNCTION__)) | |||
| 1439 | Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT ||(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1441, __extension__ __PRETTY_FUNCTION__)) | |||
| 1440 | Opcode == TargetOpcode::G_USHLSAT) &&(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1441, __extension__ __PRETTY_FUNCTION__)) | |||
| 1441 | "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT")(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1441, __extension__ __PRETTY_FUNCTION__)); | |||
| 1442 | ||||
| 1443 | Register Shl2 = MI.getOperand(1).getReg(); | |||
| 1444 | Register Imm1 = MI.getOperand(2).getReg(); | |||
| 1445 | auto MaybeImmVal = getIConstantVRegValWithLookThrough(Imm1, MRI); | |||
| 1446 | if (!MaybeImmVal) | |||
| 1447 | return false; | |||
| 1448 | ||||
| 1449 | MachineInstr *Shl2Def = MRI.getUniqueVRegDef(Shl2); | |||
| 1450 | if (Shl2Def->getOpcode() != Opcode) | |||
| 1451 | return false; | |||
| 1452 | ||||
| 1453 | Register Base = Shl2Def->getOperand(1).getReg(); | |||
| 1454 | Register Imm2 = Shl2Def->getOperand(2).getReg(); | |||
| 1455 | auto MaybeImm2Val = getIConstantVRegValWithLookThrough(Imm2, MRI); | |||
| 1456 | if (!MaybeImm2Val) | |||
| 1457 | return false; | |||
| 1458 | ||||
| 1459 | // Pass the combined immediate to the apply function. | |||
| 1460 | MatchInfo.Imm = | |||
| 1461 | (MaybeImmVal->Value.getSExtValue() + MaybeImm2Val->Value).getSExtValue(); | |||
| 1462 | MatchInfo.Reg = Base; | |||
| 1463 | ||||
| 1464 | // There is no simple replacement for a saturating unsigned left shift that | |||
| 1465 | // exceeds the scalar size. | |||
| 1466 | if (Opcode == TargetOpcode::G_USHLSAT && | |||
| 1467 | MatchInfo.Imm >= MRI.getType(Shl2).getScalarSizeInBits()) | |||
| 1468 | return false; | |||
| 1469 | ||||
| 1470 | return true; | |||
| 1471 | } | |||
| 1472 | ||||
| 1473 | void CombinerHelper::applyShiftImmedChain(MachineInstr &MI, | |||
| 1474 | RegisterImmPair &MatchInfo) { | |||
| 1475 | unsigned Opcode = MI.getOpcode(); | |||
| 1476 | assert((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR ||(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1479, __extension__ __PRETTY_FUNCTION__)) | |||
| 1477 | Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT ||(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1479, __extension__ __PRETTY_FUNCTION__)) | |||
| 1478 | Opcode == TargetOpcode::G_USHLSAT) &&(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1479, __extension__ __PRETTY_FUNCTION__)) | |||
| 1479 | "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT")(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode:: G_USHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_SSHLSAT || Opcode == TargetOpcode::G_USHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1479, __extension__ __PRETTY_FUNCTION__)); | |||
| 1480 | ||||
| 1481 | Builder.setInstrAndDebugLoc(MI); | |||
| 1482 | LLT Ty = MRI.getType(MI.getOperand(1).getReg()); | |||
| 1483 | unsigned const ScalarSizeInBits = Ty.getScalarSizeInBits(); | |||
| 1484 | auto Imm = MatchInfo.Imm; | |||
| 1485 | ||||
| 1486 | if (Imm >= ScalarSizeInBits) { | |||
| 1487 | // Any logical shift that exceeds scalar size will produce zero. | |||
| 1488 | if (Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_LSHR) { | |||
| 1489 | Builder.buildConstant(MI.getOperand(0), 0); | |||
| 1490 | MI.eraseFromParent(); | |||
| 1491 | return; | |||
| 1492 | } | |||
| 1493 | // Arithmetic shift and saturating signed left shift have no effect beyond | |||
| 1494 | // scalar size. | |||
| 1495 | Imm = ScalarSizeInBits - 1; | |||
| 1496 | } | |||
| 1497 | ||||
| 1498 | LLT ImmTy = MRI.getType(MI.getOperand(2).getReg()); | |||
| 1499 | Register NewImm = Builder.buildConstant(ImmTy, Imm).getReg(0); | |||
| 1500 | Observer.changingInstr(MI); | |||
| 1501 | MI.getOperand(1).setReg(MatchInfo.Reg); | |||
| 1502 | MI.getOperand(2).setReg(NewImm); | |||
| 1503 | Observer.changedInstr(MI); | |||
| 1504 | } | |||
| 1505 | ||||
| 1506 | bool CombinerHelper::matchShiftOfShiftedLogic(MachineInstr &MI, | |||
| 1507 | ShiftOfShiftedLogic &MatchInfo) { | |||
| 1508 | // We're trying to match the following pattern with any of | |||
| 1509 | // G_SHL/G_ASHR/G_LSHR/G_USHLSAT/G_SSHLSAT shift instructions in combination | |||
| 1510 | // with any of G_AND/G_OR/G_XOR logic instructions. | |||
| 1511 | // %t1 = SHIFT %X, G_CONSTANT C0 | |||
| 1512 | // %t2 = LOGIC %t1, %Y | |||
| 1513 | // %root = SHIFT %t2, G_CONSTANT C1 | |||
| 1514 | // --> | |||
| 1515 | // %t3 = SHIFT %X, G_CONSTANT (C0+C1) | |||
| 1516 | // %t4 = SHIFT %Y, G_CONSTANT C1 | |||
| 1517 | // %root = LOGIC %t3, %t4 | |||
| 1518 | unsigned ShiftOpcode = MI.getOpcode(); | |||
| 1519 | assert((ShiftOpcode == TargetOpcode::G_SHL ||(static_cast <bool> ((ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode ::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1524, __extension__ __PRETTY_FUNCTION__)) | |||
| 1520 | ShiftOpcode == TargetOpcode::G_ASHR ||(static_cast <bool> ((ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode ::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1524, __extension__ __PRETTY_FUNCTION__)) | |||
| 1521 | ShiftOpcode == TargetOpcode::G_LSHR ||(static_cast <bool> ((ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode ::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1524, __extension__ __PRETTY_FUNCTION__)) | |||
| 1522 | ShiftOpcode == TargetOpcode::G_USHLSAT ||(static_cast <bool> ((ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode ::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1524, __extension__ __PRETTY_FUNCTION__)) | |||
| 1523 | ShiftOpcode == TargetOpcode::G_SSHLSAT) &&(static_cast <bool> ((ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode ::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1524, __extension__ __PRETTY_FUNCTION__)) | |||
| 1524 | "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT")(static_cast <bool> ((ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode ::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(ShiftOpcode == TargetOpcode::G_SHL || ShiftOpcode == TargetOpcode::G_ASHR || ShiftOpcode == TargetOpcode::G_LSHR || ShiftOpcode == TargetOpcode::G_USHLSAT || ShiftOpcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1524, __extension__ __PRETTY_FUNCTION__)); | |||
| 1525 | ||||
| 1526 | // Match a one-use bitwise logic op. | |||
| 1527 | Register LogicDest = MI.getOperand(1).getReg(); | |||
| 1528 | if (!MRI.hasOneNonDBGUse(LogicDest)) | |||
| 1529 | return false; | |||
| 1530 | ||||
| 1531 | MachineInstr *LogicMI = MRI.getUniqueVRegDef(LogicDest); | |||
| 1532 | unsigned LogicOpcode = LogicMI->getOpcode(); | |||
| 1533 | if (LogicOpcode != TargetOpcode::G_AND && LogicOpcode != TargetOpcode::G_OR && | |||
| 1534 | LogicOpcode != TargetOpcode::G_XOR) | |||
| 1535 | return false; | |||
| 1536 | ||||
| 1537 | // Find a matching one-use shift by constant. | |||
| 1538 | const Register C1 = MI.getOperand(2).getReg(); | |||
| 1539 | auto MaybeImmVal = getIConstantVRegValWithLookThrough(C1, MRI); | |||
| 1540 | if (!MaybeImmVal) | |||
| 1541 | return false; | |||
| 1542 | ||||
| 1543 | const uint64_t C1Val = MaybeImmVal->Value.getZExtValue(); | |||
| 1544 | ||||
| 1545 | auto matchFirstShift = [&](const MachineInstr *MI, uint64_t &ShiftVal) { | |||
| 1546 | // Shift should match previous one and should be a one-use. | |||
| 1547 | if (MI->getOpcode() != ShiftOpcode || | |||
| 1548 | !MRI.hasOneNonDBGUse(MI->getOperand(0).getReg())) | |||
| 1549 | return false; | |||
| 1550 | ||||
| 1551 | // Must be a constant. | |||
| 1552 | auto MaybeImmVal = | |||
| 1553 | getIConstantVRegValWithLookThrough(MI->getOperand(2).getReg(), MRI); | |||
| 1554 | if (!MaybeImmVal) | |||
| 1555 | return false; | |||
| 1556 | ||||
| 1557 | ShiftVal = MaybeImmVal->Value.getSExtValue(); | |||
| 1558 | return true; | |||
| 1559 | }; | |||
| 1560 | ||||
| 1561 | // Logic ops are commutative, so check each operand for a match. | |||
| 1562 | Register LogicMIReg1 = LogicMI->getOperand(1).getReg(); | |||
| 1563 | MachineInstr *LogicMIOp1 = MRI.getUniqueVRegDef(LogicMIReg1); | |||
| 1564 | Register LogicMIReg2 = LogicMI->getOperand(2).getReg(); | |||
| 1565 | MachineInstr *LogicMIOp2 = MRI.getUniqueVRegDef(LogicMIReg2); | |||
| 1566 | uint64_t C0Val; | |||
| 1567 | ||||
| 1568 | if (matchFirstShift(LogicMIOp1, C0Val)) { | |||
| 1569 | MatchInfo.LogicNonShiftReg = LogicMIReg2; | |||
| 1570 | MatchInfo.Shift2 = LogicMIOp1; | |||
| 1571 | } else if (matchFirstShift(LogicMIOp2, C0Val)) { | |||
| 1572 | MatchInfo.LogicNonShiftReg = LogicMIReg1; | |||
| 1573 | MatchInfo.Shift2 = LogicMIOp2; | |||
| 1574 | } else | |||
| 1575 | return false; | |||
| 1576 | ||||
| 1577 | MatchInfo.ValSum = C0Val + C1Val; | |||
| 1578 | ||||
| 1579 | // The fold is not valid if the sum of the shift values exceeds bitwidth. | |||
| 1580 | if (MatchInfo.ValSum >= MRI.getType(LogicDest).getScalarSizeInBits()) | |||
| 1581 | return false; | |||
| 1582 | ||||
| 1583 | MatchInfo.Logic = LogicMI; | |||
| 1584 | return true; | |||
| 1585 | } | |||
| 1586 | ||||
| 1587 | void CombinerHelper::applyShiftOfShiftedLogic(MachineInstr &MI, | |||
| 1588 | ShiftOfShiftedLogic &MatchInfo) { | |||
| 1589 | unsigned Opcode = MI.getOpcode(); | |||
| 1590 | assert((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR ||(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode:: G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1593, __extension__ __PRETTY_FUNCTION__)) | |||
| 1591 | Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT ||(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode:: G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1593, __extension__ __PRETTY_FUNCTION__)) | |||
| 1592 | Opcode == TargetOpcode::G_SSHLSAT) &&(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode:: G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1593, __extension__ __PRETTY_FUNCTION__)) | |||
| 1593 | "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT")(static_cast <bool> ((Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode:: G_SSHLSAT) && "Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT" ) ? void (0) : __assert_fail ("(Opcode == TargetOpcode::G_SHL || Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_USHLSAT || Opcode == TargetOpcode::G_SSHLSAT) && \"Expected G_SHL, G_ASHR, G_LSHR, G_USHLSAT and G_SSHLSAT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1593, __extension__ __PRETTY_FUNCTION__)); | |||
| 1594 | ||||
| 1595 | LLT ShlType = MRI.getType(MI.getOperand(2).getReg()); | |||
| 1596 | LLT DestType = MRI.getType(MI.getOperand(0).getReg()); | |||
| 1597 | Builder.setInstrAndDebugLoc(MI); | |||
| 1598 | ||||
| 1599 | Register Const = Builder.buildConstant(ShlType, MatchInfo.ValSum).getReg(0); | |||
| 1600 | ||||
| 1601 | Register Shift1Base = MatchInfo.Shift2->getOperand(1).getReg(); | |||
| 1602 | Register Shift1 = | |||
| 1603 | Builder.buildInstr(Opcode, {DestType}, {Shift1Base, Const}).getReg(0); | |||
| 1604 | ||||
| 1605 | // If LogicNonShiftReg is the same to Shift1Base, and shift1 const is the same | |||
| 1606 | // to MatchInfo.Shift2 const, CSEMIRBuilder will reuse the old shift1 when | |||
| 1607 | // build shift2. So, if we erase MatchInfo.Shift2 at the end, actually we | |||
| 1608 | // remove old shift1. And it will cause crash later. So erase it earlier to | |||
| 1609 | // avoid the crash. | |||
| 1610 | MatchInfo.Shift2->eraseFromParent(); | |||
| 1611 | ||||
| 1612 | Register Shift2Const = MI.getOperand(2).getReg(); | |||
| 1613 | Register Shift2 = Builder | |||
| 1614 | .buildInstr(Opcode, {DestType}, | |||
| 1615 | {MatchInfo.LogicNonShiftReg, Shift2Const}) | |||
| 1616 | .getReg(0); | |||
| 1617 | ||||
| 1618 | Register Dest = MI.getOperand(0).getReg(); | |||
| 1619 | Builder.buildInstr(MatchInfo.Logic->getOpcode(), {Dest}, {Shift1, Shift2}); | |||
| 1620 | ||||
| 1621 | // This was one use so it's safe to remove it. | |||
| 1622 | MatchInfo.Logic->eraseFromParent(); | |||
| 1623 | ||||
| 1624 | MI.eraseFromParent(); | |||
| 1625 | } | |||
| 1626 | ||||
| 1627 | bool CombinerHelper::matchCommuteShift(MachineInstr &MI, BuildFnTy &MatchInfo) { | |||
| 1628 | assert(MI.getOpcode() == TargetOpcode::G_SHL && "Expected G_SHL")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SHL && "Expected G_SHL") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SHL && \"Expected G_SHL\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1628, __extension__ __PRETTY_FUNCTION__)); | |||
| 1629 | // Combine (shl (add x, c1), c2) -> (add (shl x, c2), c1 << c2) | |||
| 1630 | // Combine (shl (or x, c1), c2) -> (or (shl x, c2), c1 << c2) | |||
| 1631 | auto &Shl = cast<GenericMachineInstr>(MI); | |||
| 1632 | Register DstReg = Shl.getReg(0); | |||
| 1633 | Register SrcReg = Shl.getReg(1); | |||
| 1634 | Register ShiftReg = Shl.getReg(2); | |||
| 1635 | Register X, C1; | |||
| 1636 | ||||
| 1637 | if (!getTargetLowering().isDesirableToCommuteWithShift(MI, !isPreLegalize())) | |||
| 1638 | return false; | |||
| 1639 | ||||
| 1640 | if (!mi_match(SrcReg, MRI, | |||
| 1641 | m_OneNonDBGUse(m_any_of(m_GAdd(m_Reg(X), m_Reg(C1)), | |||
| 1642 | m_GOr(m_Reg(X), m_Reg(C1)))))) | |||
| 1643 | return false; | |||
| 1644 | ||||
| 1645 | APInt C1Val, C2Val; | |||
| 1646 | if (!mi_match(C1, MRI, m_ICstOrSplat(C1Val)) || | |||
| 1647 | !mi_match(ShiftReg, MRI, m_ICstOrSplat(C2Val))) | |||
| 1648 | return false; | |||
| 1649 | ||||
| 1650 | auto *SrcDef = MRI.getVRegDef(SrcReg); | |||
| 1651 | assert((SrcDef->getOpcode() == TargetOpcode::G_ADD ||(static_cast <bool> ((SrcDef->getOpcode() == TargetOpcode ::G_ADD || SrcDef->getOpcode() == TargetOpcode::G_OR) && "Unexpected op") ? void (0) : __assert_fail ("(SrcDef->getOpcode() == TargetOpcode::G_ADD || SrcDef->getOpcode() == TargetOpcode::G_OR) && \"Unexpected op\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1652, __extension__ __PRETTY_FUNCTION__)) | |||
| 1652 | SrcDef->getOpcode() == TargetOpcode::G_OR) && "Unexpected op")(static_cast <bool> ((SrcDef->getOpcode() == TargetOpcode ::G_ADD || SrcDef->getOpcode() == TargetOpcode::G_OR) && "Unexpected op") ? void (0) : __assert_fail ("(SrcDef->getOpcode() == TargetOpcode::G_ADD || SrcDef->getOpcode() == TargetOpcode::G_OR) && \"Unexpected op\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1652, __extension__ __PRETTY_FUNCTION__)); | |||
| 1653 | LLT SrcTy = MRI.getType(SrcReg); | |||
| 1654 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 1655 | auto S1 = B.buildShl(SrcTy, X, ShiftReg); | |||
| 1656 | auto S2 = B.buildShl(SrcTy, C1, ShiftReg); | |||
| 1657 | B.buildInstr(SrcDef->getOpcode(), {DstReg}, {S1, S2}); | |||
| 1658 | }; | |||
| 1659 | return true; | |||
| 1660 | } | |||
| 1661 | ||||
| 1662 | bool CombinerHelper::matchCombineMulToShl(MachineInstr &MI, | |||
| 1663 | unsigned &ShiftVal) { | |||
| 1664 | assert(MI.getOpcode() == TargetOpcode::G_MUL && "Expected a G_MUL")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_MUL && "Expected a G_MUL") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_MUL && \"Expected a G_MUL\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1664, __extension__ __PRETTY_FUNCTION__)); | |||
| 1665 | auto MaybeImmVal = | |||
| 1666 | getIConstantVRegValWithLookThrough(MI.getOperand(2).getReg(), MRI); | |||
| 1667 | if (!MaybeImmVal) | |||
| 1668 | return false; | |||
| 1669 | ||||
| 1670 | ShiftVal = MaybeImmVal->Value.exactLogBase2(); | |||
| 1671 | return (static_cast<int32_t>(ShiftVal) != -1); | |||
| 1672 | } | |||
| 1673 | ||||
| 1674 | void CombinerHelper::applyCombineMulToShl(MachineInstr &MI, | |||
| 1675 | unsigned &ShiftVal) { | |||
| 1676 | assert(MI.getOpcode() == TargetOpcode::G_MUL && "Expected a G_MUL")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_MUL && "Expected a G_MUL") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_MUL && \"Expected a G_MUL\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1676, __extension__ __PRETTY_FUNCTION__)); | |||
| 1677 | MachineIRBuilder MIB(MI); | |||
| 1678 | LLT ShiftTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 1679 | auto ShiftCst = MIB.buildConstant(ShiftTy, ShiftVal); | |||
| 1680 | Observer.changingInstr(MI); | |||
| 1681 | MI.setDesc(MIB.getTII().get(TargetOpcode::G_SHL)); | |||
| 1682 | MI.getOperand(2).setReg(ShiftCst.getReg(0)); | |||
| 1683 | Observer.changedInstr(MI); | |||
| 1684 | } | |||
| 1685 | ||||
| 1686 | // shl ([sza]ext x), y => zext (shl x, y), if shift does not overflow source | |||
| 1687 | bool CombinerHelper::matchCombineShlOfExtend(MachineInstr &MI, | |||
| 1688 | RegisterImmPair &MatchData) { | |||
| 1689 | assert(MI.getOpcode() == TargetOpcode::G_SHL && KB)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SHL && KB) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SHL && KB" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1689, __extension__ __PRETTY_FUNCTION__)); | |||
| 1690 | ||||
| 1691 | Register LHS = MI.getOperand(1).getReg(); | |||
| 1692 | ||||
| 1693 | Register ExtSrc; | |||
| 1694 | if (!mi_match(LHS, MRI, m_GAnyExt(m_Reg(ExtSrc))) && | |||
| 1695 | !mi_match(LHS, MRI, m_GZExt(m_Reg(ExtSrc))) && | |||
| 1696 | !mi_match(LHS, MRI, m_GSExt(m_Reg(ExtSrc)))) | |||
| 1697 | return false; | |||
| 1698 | ||||
| 1699 | // TODO: Should handle vector splat. | |||
| 1700 | Register RHS = MI.getOperand(2).getReg(); | |||
| 1701 | auto MaybeShiftAmtVal = getIConstantVRegValWithLookThrough(RHS, MRI); | |||
| 1702 | if (!MaybeShiftAmtVal) | |||
| 1703 | return false; | |||
| 1704 | ||||
| 1705 | if (LI) { | |||
| 1706 | LLT SrcTy = MRI.getType(ExtSrc); | |||
| 1707 | ||||
| 1708 | // We only really care about the legality with the shifted value. We can | |||
| 1709 | // pick any type the constant shift amount, so ask the target what to | |||
| 1710 | // use. Otherwise we would have to guess and hope it is reported as legal. | |||
| 1711 | LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(SrcTy); | |||
| 1712 | if (!isLegalOrBeforeLegalizer({TargetOpcode::G_SHL, {SrcTy, ShiftAmtTy}})) | |||
| 1713 | return false; | |||
| 1714 | } | |||
| 1715 | ||||
| 1716 | int64_t ShiftAmt = MaybeShiftAmtVal->Value.getSExtValue(); | |||
| 1717 | MatchData.Reg = ExtSrc; | |||
| 1718 | MatchData.Imm = ShiftAmt; | |||
| 1719 | ||||
| 1720 | unsigned MinLeadingZeros = KB->getKnownZeroes(ExtSrc).countl_one(); | |||
| 1721 | return MinLeadingZeros >= ShiftAmt; | |||
| 1722 | } | |||
| 1723 | ||||
| 1724 | void CombinerHelper::applyCombineShlOfExtend(MachineInstr &MI, | |||
| 1725 | const RegisterImmPair &MatchData) { | |||
| 1726 | Register ExtSrcReg = MatchData.Reg; | |||
| 1727 | int64_t ShiftAmtVal = MatchData.Imm; | |||
| 1728 | ||||
| 1729 | LLT ExtSrcTy = MRI.getType(ExtSrcReg); | |||
| 1730 | Builder.setInstrAndDebugLoc(MI); | |||
| 1731 | auto ShiftAmt = Builder.buildConstant(ExtSrcTy, ShiftAmtVal); | |||
| 1732 | auto NarrowShift = | |||
| 1733 | Builder.buildShl(ExtSrcTy, ExtSrcReg, ShiftAmt, MI.getFlags()); | |||
| 1734 | Builder.buildZExt(MI.getOperand(0), NarrowShift); | |||
| 1735 | MI.eraseFromParent(); | |||
| 1736 | } | |||
| 1737 | ||||
| 1738 | bool CombinerHelper::matchCombineMergeUnmerge(MachineInstr &MI, | |||
| 1739 | Register &MatchInfo) { | |||
| 1740 | GMerge &Merge = cast<GMerge>(MI); | |||
| 1741 | SmallVector<Register, 16> MergedValues; | |||
| 1742 | for (unsigned I = 0; I < Merge.getNumSources(); ++I) | |||
| 1743 | MergedValues.emplace_back(Merge.getSourceReg(I)); | |||
| 1744 | ||||
| 1745 | auto *Unmerge = getOpcodeDef<GUnmerge>(MergedValues[0], MRI); | |||
| 1746 | if (!Unmerge || Unmerge->getNumDefs() != Merge.getNumSources()) | |||
| 1747 | return false; | |||
| 1748 | ||||
| 1749 | for (unsigned I = 0; I < MergedValues.size(); ++I) | |||
| 1750 | if (MergedValues[I] != Unmerge->getReg(I)) | |||
| 1751 | return false; | |||
| 1752 | ||||
| 1753 | MatchInfo = Unmerge->getSourceReg(); | |||
| 1754 | return true; | |||
| 1755 | } | |||
| 1756 | ||||
| 1757 | static Register peekThroughBitcast(Register Reg, | |||
| 1758 | const MachineRegisterInfo &MRI) { | |||
| 1759 | while (mi_match(Reg, MRI, m_GBitcast(m_Reg(Reg)))) | |||
| 1760 | ; | |||
| 1761 | ||||
| 1762 | return Reg; | |||
| 1763 | } | |||
| 1764 | ||||
| 1765 | bool CombinerHelper::matchCombineUnmergeMergeToPlainValues( | |||
| 1766 | MachineInstr &MI, SmallVectorImpl<Register> &Operands) { | |||
| 1767 | assert(MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1768, __extension__ __PRETTY_FUNCTION__)) | |||
| 1768 | "Expected an unmerge")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1768, __extension__ __PRETTY_FUNCTION__)); | |||
| 1769 | auto &Unmerge = cast<GUnmerge>(MI); | |||
| 1770 | Register SrcReg = peekThroughBitcast(Unmerge.getSourceReg(), MRI); | |||
| 1771 | ||||
| 1772 | auto *SrcInstr = getOpcodeDef<GMergeLikeInstr>(SrcReg, MRI); | |||
| 1773 | if (!SrcInstr) | |||
| 1774 | return false; | |||
| 1775 | ||||
| 1776 | // Check the source type of the merge. | |||
| 1777 | LLT SrcMergeTy = MRI.getType(SrcInstr->getSourceReg(0)); | |||
| 1778 | LLT Dst0Ty = MRI.getType(Unmerge.getReg(0)); | |||
| 1779 | bool SameSize = Dst0Ty.getSizeInBits() == SrcMergeTy.getSizeInBits(); | |||
| 1780 | if (SrcMergeTy != Dst0Ty && !SameSize) | |||
| 1781 | return false; | |||
| 1782 | // They are the same now (modulo a bitcast). | |||
| 1783 | // We can collect all the src registers. | |||
| 1784 | for (unsigned Idx = 0; Idx < SrcInstr->getNumSources(); ++Idx) | |||
| 1785 | Operands.push_back(SrcInstr->getSourceReg(Idx)); | |||
| 1786 | return true; | |||
| 1787 | } | |||
| 1788 | ||||
| 1789 | void CombinerHelper::applyCombineUnmergeMergeToPlainValues( | |||
| 1790 | MachineInstr &MI, SmallVectorImpl<Register> &Operands) { | |||
| 1791 | assert(MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1792, __extension__ __PRETTY_FUNCTION__)) | |||
| 1792 | "Expected an unmerge")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1792, __extension__ __PRETTY_FUNCTION__)); | |||
| 1793 | assert((MI.getNumOperands() - 1 == Operands.size()) &&(static_cast <bool> ((MI.getNumOperands() - 1 == Operands .size()) && "Not enough operands to replace all defs" ) ? void (0) : __assert_fail ("(MI.getNumOperands() - 1 == Operands.size()) && \"Not enough operands to replace all defs\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1794, __extension__ __PRETTY_FUNCTION__)) | |||
| 1794 | "Not enough operands to replace all defs")(static_cast <bool> ((MI.getNumOperands() - 1 == Operands .size()) && "Not enough operands to replace all defs" ) ? void (0) : __assert_fail ("(MI.getNumOperands() - 1 == Operands.size()) && \"Not enough operands to replace all defs\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1794, __extension__ __PRETTY_FUNCTION__)); | |||
| 1795 | unsigned NumElems = MI.getNumOperands() - 1; | |||
| 1796 | ||||
| 1797 | LLT SrcTy = MRI.getType(Operands[0]); | |||
| 1798 | LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 1799 | bool CanReuseInputDirectly = DstTy == SrcTy; | |||
| 1800 | Builder.setInstrAndDebugLoc(MI); | |||
| 1801 | for (unsigned Idx = 0; Idx < NumElems; ++Idx) { | |||
| 1802 | Register DstReg = MI.getOperand(Idx).getReg(); | |||
| 1803 | Register SrcReg = Operands[Idx]; | |||
| 1804 | ||||
| 1805 | // This combine may run after RegBankSelect, so we need to be aware of | |||
| 1806 | // register banks. | |||
| 1807 | const auto &DstCB = MRI.getRegClassOrRegBank(DstReg); | |||
| 1808 | if (!DstCB.isNull() && DstCB != MRI.getRegClassOrRegBank(SrcReg)) { | |||
| 1809 | SrcReg = Builder.buildCopy(MRI.getType(SrcReg), SrcReg).getReg(0); | |||
| 1810 | MRI.setRegClassOrRegBank(SrcReg, DstCB); | |||
| 1811 | } | |||
| 1812 | ||||
| 1813 | if (CanReuseInputDirectly) | |||
| 1814 | replaceRegWith(MRI, DstReg, SrcReg); | |||
| 1815 | else | |||
| 1816 | Builder.buildCast(DstReg, SrcReg); | |||
| 1817 | } | |||
| 1818 | MI.eraseFromParent(); | |||
| 1819 | } | |||
| 1820 | ||||
| 1821 | bool CombinerHelper::matchCombineUnmergeConstant(MachineInstr &MI, | |||
| 1822 | SmallVectorImpl<APInt> &Csts) { | |||
| 1823 | unsigned SrcIdx = MI.getNumOperands() - 1; | |||
| 1824 | Register SrcReg = MI.getOperand(SrcIdx).getReg(); | |||
| 1825 | MachineInstr *SrcInstr = MRI.getVRegDef(SrcReg); | |||
| 1826 | if (SrcInstr->getOpcode() != TargetOpcode::G_CONSTANT && | |||
| 1827 | SrcInstr->getOpcode() != TargetOpcode::G_FCONSTANT) | |||
| 1828 | return false; | |||
| 1829 | // Break down the big constant in smaller ones. | |||
| 1830 | const MachineOperand &CstVal = SrcInstr->getOperand(1); | |||
| 1831 | APInt Val = SrcInstr->getOpcode() == TargetOpcode::G_CONSTANT | |||
| 1832 | ? CstVal.getCImm()->getValue() | |||
| 1833 | : CstVal.getFPImm()->getValueAPF().bitcastToAPInt(); | |||
| 1834 | ||||
| 1835 | LLT Dst0Ty = MRI.getType(MI.getOperand(0).getReg()); | |||
| 1836 | unsigned ShiftAmt = Dst0Ty.getSizeInBits(); | |||
| 1837 | // Unmerge a constant. | |||
| 1838 | for (unsigned Idx = 0; Idx != SrcIdx; ++Idx) { | |||
| 1839 | Csts.emplace_back(Val.trunc(ShiftAmt)); | |||
| 1840 | Val = Val.lshr(ShiftAmt); | |||
| 1841 | } | |||
| 1842 | ||||
| 1843 | return true; | |||
| 1844 | } | |||
| 1845 | ||||
| 1846 | void CombinerHelper::applyCombineUnmergeConstant(MachineInstr &MI, | |||
| 1847 | SmallVectorImpl<APInt> &Csts) { | |||
| 1848 | assert(MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1849, __extension__ __PRETTY_FUNCTION__)) | |||
| 1849 | "Expected an unmerge")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1849, __extension__ __PRETTY_FUNCTION__)); | |||
| 1850 | assert((MI.getNumOperands() - 1 == Csts.size()) &&(static_cast <bool> ((MI.getNumOperands() - 1 == Csts.size ()) && "Not enough operands to replace all defs") ? void (0) : __assert_fail ("(MI.getNumOperands() - 1 == Csts.size()) && \"Not enough operands to replace all defs\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1851, __extension__ __PRETTY_FUNCTION__)) | |||
| 1851 | "Not enough operands to replace all defs")(static_cast <bool> ((MI.getNumOperands() - 1 == Csts.size ()) && "Not enough operands to replace all defs") ? void (0) : __assert_fail ("(MI.getNumOperands() - 1 == Csts.size()) && \"Not enough operands to replace all defs\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1851, __extension__ __PRETTY_FUNCTION__)); | |||
| 1852 | unsigned NumElems = MI.getNumOperands() - 1; | |||
| 1853 | Builder.setInstrAndDebugLoc(MI); | |||
| 1854 | for (unsigned Idx = 0; Idx < NumElems; ++Idx) { | |||
| 1855 | Register DstReg = MI.getOperand(Idx).getReg(); | |||
| 1856 | Builder.buildConstant(DstReg, Csts[Idx]); | |||
| 1857 | } | |||
| 1858 | ||||
| 1859 | MI.eraseFromParent(); | |||
| 1860 | } | |||
| 1861 | ||||
| 1862 | bool CombinerHelper::matchCombineUnmergeUndef( | |||
| 1863 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 1864 | unsigned SrcIdx = MI.getNumOperands() - 1; | |||
| 1865 | Register SrcReg = MI.getOperand(SrcIdx).getReg(); | |||
| 1866 | MatchInfo = [&MI](MachineIRBuilder &B) { | |||
| 1867 | unsigned NumElems = MI.getNumOperands() - 1; | |||
| 1868 | for (unsigned Idx = 0; Idx < NumElems; ++Idx) { | |||
| 1869 | Register DstReg = MI.getOperand(Idx).getReg(); | |||
| 1870 | B.buildUndef(DstReg); | |||
| 1871 | } | |||
| 1872 | }; | |||
| 1873 | return isa<GImplicitDef>(MRI.getVRegDef(SrcReg)); | |||
| 1874 | } | |||
| 1875 | ||||
| 1876 | bool CombinerHelper::matchCombineUnmergeWithDeadLanesToTrunc(MachineInstr &MI) { | |||
| 1877 | assert(MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1878, __extension__ __PRETTY_FUNCTION__)) | |||
| 1878 | "Expected an unmerge")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1878, __extension__ __PRETTY_FUNCTION__)); | |||
| 1879 | // Check that all the lanes are dead except the first one. | |||
| 1880 | for (unsigned Idx = 1, EndIdx = MI.getNumDefs(); Idx != EndIdx; ++Idx) { | |||
| 1881 | if (!MRI.use_nodbg_empty(MI.getOperand(Idx).getReg())) | |||
| 1882 | return false; | |||
| 1883 | } | |||
| 1884 | return true; | |||
| 1885 | } | |||
| 1886 | ||||
| 1887 | void CombinerHelper::applyCombineUnmergeWithDeadLanesToTrunc(MachineInstr &MI) { | |||
| 1888 | Builder.setInstrAndDebugLoc(MI); | |||
| 1889 | Register SrcReg = MI.getOperand(MI.getNumDefs()).getReg(); | |||
| 1890 | // Truncating a vector is going to truncate every single lane, | |||
| 1891 | // whereas we want the full lowbits. | |||
| 1892 | // Do the operation on a scalar instead. | |||
| 1893 | LLT SrcTy = MRI.getType(SrcReg); | |||
| 1894 | if (SrcTy.isVector()) | |||
| 1895 | SrcReg = | |||
| 1896 | Builder.buildCast(LLT::scalar(SrcTy.getSizeInBits()), SrcReg).getReg(0); | |||
| 1897 | ||||
| 1898 | Register Dst0Reg = MI.getOperand(0).getReg(); | |||
| 1899 | LLT Dst0Ty = MRI.getType(Dst0Reg); | |||
| 1900 | if (Dst0Ty.isVector()) { | |||
| 1901 | auto MIB = Builder.buildTrunc(LLT::scalar(Dst0Ty.getSizeInBits()), SrcReg); | |||
| 1902 | Builder.buildCast(Dst0Reg, MIB); | |||
| 1903 | } else | |||
| 1904 | Builder.buildTrunc(Dst0Reg, SrcReg); | |||
| 1905 | MI.eraseFromParent(); | |||
| 1906 | } | |||
| 1907 | ||||
| 1908 | bool CombinerHelper::matchCombineUnmergeZExtToZExt(MachineInstr &MI) { | |||
| 1909 | assert(MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1910, __extension__ __PRETTY_FUNCTION__)) | |||
| 1910 | "Expected an unmerge")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1910, __extension__ __PRETTY_FUNCTION__)); | |||
| 1911 | Register Dst0Reg = MI.getOperand(0).getReg(); | |||
| 1912 | LLT Dst0Ty = MRI.getType(Dst0Reg); | |||
| 1913 | // G_ZEXT on vector applies to each lane, so it will | |||
| 1914 | // affect all destinations. Therefore we won't be able | |||
| 1915 | // to simplify the unmerge to just the first definition. | |||
| 1916 | if (Dst0Ty.isVector()) | |||
| 1917 | return false; | |||
| 1918 | Register SrcReg = MI.getOperand(MI.getNumDefs()).getReg(); | |||
| 1919 | LLT SrcTy = MRI.getType(SrcReg); | |||
| 1920 | if (SrcTy.isVector()) | |||
| 1921 | return false; | |||
| 1922 | ||||
| 1923 | Register ZExtSrcReg; | |||
| 1924 | if (!mi_match(SrcReg, MRI, m_GZExt(m_Reg(ZExtSrcReg)))) | |||
| 1925 | return false; | |||
| 1926 | ||||
| 1927 | // Finally we can replace the first definition with | |||
| 1928 | // a zext of the source if the definition is big enough to hold | |||
| 1929 | // all of ZExtSrc bits. | |||
| 1930 | LLT ZExtSrcTy = MRI.getType(ZExtSrcReg); | |||
| 1931 | return ZExtSrcTy.getSizeInBits() <= Dst0Ty.getSizeInBits(); | |||
| 1932 | } | |||
| 1933 | ||||
| 1934 | void CombinerHelper::applyCombineUnmergeZExtToZExt(MachineInstr &MI) { | |||
| 1935 | assert(MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1936, __extension__ __PRETTY_FUNCTION__)) | |||
| 1936 | "Expected an unmerge")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && "Expected an unmerge") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UNMERGE_VALUES && \"Expected an unmerge\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1936, __extension__ __PRETTY_FUNCTION__)); | |||
| 1937 | ||||
| 1938 | Register Dst0Reg = MI.getOperand(0).getReg(); | |||
| 1939 | ||||
| 1940 | MachineInstr *ZExtInstr = | |||
| 1941 | MRI.getVRegDef(MI.getOperand(MI.getNumDefs()).getReg()); | |||
| 1942 | assert(ZExtInstr && ZExtInstr->getOpcode() == TargetOpcode::G_ZEXT &&(static_cast <bool> (ZExtInstr && ZExtInstr-> getOpcode() == TargetOpcode::G_ZEXT && "Expecting a G_ZEXT" ) ? void (0) : __assert_fail ("ZExtInstr && ZExtInstr->getOpcode() == TargetOpcode::G_ZEXT && \"Expecting a G_ZEXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1943, __extension__ __PRETTY_FUNCTION__)) | |||
| 1943 | "Expecting a G_ZEXT")(static_cast <bool> (ZExtInstr && ZExtInstr-> getOpcode() == TargetOpcode::G_ZEXT && "Expecting a G_ZEXT" ) ? void (0) : __assert_fail ("ZExtInstr && ZExtInstr->getOpcode() == TargetOpcode::G_ZEXT && \"Expecting a G_ZEXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1943, __extension__ __PRETTY_FUNCTION__)); | |||
| 1944 | ||||
| 1945 | Register ZExtSrcReg = ZExtInstr->getOperand(1).getReg(); | |||
| 1946 | LLT Dst0Ty = MRI.getType(Dst0Reg); | |||
| 1947 | LLT ZExtSrcTy = MRI.getType(ZExtSrcReg); | |||
| 1948 | ||||
| 1949 | Builder.setInstrAndDebugLoc(MI); | |||
| 1950 | ||||
| 1951 | if (Dst0Ty.getSizeInBits() > ZExtSrcTy.getSizeInBits()) { | |||
| 1952 | Builder.buildZExt(Dst0Reg, ZExtSrcReg); | |||
| 1953 | } else { | |||
| 1954 | assert(Dst0Ty.getSizeInBits() == ZExtSrcTy.getSizeInBits() &&(static_cast <bool> (Dst0Ty.getSizeInBits() == ZExtSrcTy .getSizeInBits() && "ZExt src doesn't fit in destination" ) ? void (0) : __assert_fail ("Dst0Ty.getSizeInBits() == ZExtSrcTy.getSizeInBits() && \"ZExt src doesn't fit in destination\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1955, __extension__ __PRETTY_FUNCTION__)) | |||
| 1955 | "ZExt src doesn't fit in destination")(static_cast <bool> (Dst0Ty.getSizeInBits() == ZExtSrcTy .getSizeInBits() && "ZExt src doesn't fit in destination" ) ? void (0) : __assert_fail ("Dst0Ty.getSizeInBits() == ZExtSrcTy.getSizeInBits() && \"ZExt src doesn't fit in destination\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1955, __extension__ __PRETTY_FUNCTION__)); | |||
| 1956 | replaceRegWith(MRI, Dst0Reg, ZExtSrcReg); | |||
| 1957 | } | |||
| 1958 | ||||
| 1959 | Register ZeroReg; | |||
| 1960 | for (unsigned Idx = 1, EndIdx = MI.getNumDefs(); Idx != EndIdx; ++Idx) { | |||
| 1961 | if (!ZeroReg) | |||
| 1962 | ZeroReg = Builder.buildConstant(Dst0Ty, 0).getReg(0); | |||
| 1963 | replaceRegWith(MRI, MI.getOperand(Idx).getReg(), ZeroReg); | |||
| 1964 | } | |||
| 1965 | MI.eraseFromParent(); | |||
| 1966 | } | |||
| 1967 | ||||
| 1968 | bool CombinerHelper::matchCombineShiftToUnmerge(MachineInstr &MI, | |||
| 1969 | unsigned TargetShiftSize, | |||
| 1970 | unsigned &ShiftVal) { | |||
| 1971 | assert((MI.getOpcode() == TargetOpcode::G_SHL ||(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_SHL || MI.getOpcode() == TargetOpcode::G_LSHR || MI.getOpcode() == TargetOpcode::G_ASHR) && "Expected a shift") ? void ( 0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_SHL || MI.getOpcode() == TargetOpcode::G_LSHR || MI.getOpcode() == TargetOpcode::G_ASHR) && \"Expected a shift\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1973, __extension__ __PRETTY_FUNCTION__)) | |||
| 1972 | MI.getOpcode() == TargetOpcode::G_LSHR ||(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_SHL || MI.getOpcode() == TargetOpcode::G_LSHR || MI.getOpcode() == TargetOpcode::G_ASHR) && "Expected a shift") ? void ( 0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_SHL || MI.getOpcode() == TargetOpcode::G_LSHR || MI.getOpcode() == TargetOpcode::G_ASHR) && \"Expected a shift\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1973, __extension__ __PRETTY_FUNCTION__)) | |||
| 1973 | MI.getOpcode() == TargetOpcode::G_ASHR) && "Expected a shift")(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_SHL || MI.getOpcode() == TargetOpcode::G_LSHR || MI.getOpcode() == TargetOpcode::G_ASHR) && "Expected a shift") ? void ( 0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_SHL || MI.getOpcode() == TargetOpcode::G_LSHR || MI.getOpcode() == TargetOpcode::G_ASHR) && \"Expected a shift\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 1973, __extension__ __PRETTY_FUNCTION__)); | |||
| 1974 | ||||
| 1975 | LLT Ty = MRI.getType(MI.getOperand(0).getReg()); | |||
| 1976 | if (Ty.isVector()) // TODO: | |||
| 1977 | return false; | |||
| 1978 | ||||
| 1979 | // Don't narrow further than the requested size. | |||
| 1980 | unsigned Size = Ty.getSizeInBits(); | |||
| 1981 | if (Size <= TargetShiftSize) | |||
| 1982 | return false; | |||
| 1983 | ||||
| 1984 | auto MaybeImmVal = | |||
| 1985 | getIConstantVRegValWithLookThrough(MI.getOperand(2).getReg(), MRI); | |||
| 1986 | if (!MaybeImmVal) | |||
| 1987 | return false; | |||
| 1988 | ||||
| 1989 | ShiftVal = MaybeImmVal->Value.getSExtValue(); | |||
| 1990 | return ShiftVal >= Size / 2 && ShiftVal < Size; | |||
| 1991 | } | |||
| 1992 | ||||
| 1993 | void CombinerHelper::applyCombineShiftToUnmerge(MachineInstr &MI, | |||
| 1994 | const unsigned &ShiftVal) { | |||
| 1995 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 1996 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 1997 | LLT Ty = MRI.getType(SrcReg); | |||
| 1998 | unsigned Size = Ty.getSizeInBits(); | |||
| 1999 | unsigned HalfSize = Size / 2; | |||
| 2000 | assert(ShiftVal >= HalfSize)(static_cast <bool> (ShiftVal >= HalfSize) ? void (0 ) : __assert_fail ("ShiftVal >= HalfSize", "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp" , 2000, __extension__ __PRETTY_FUNCTION__)); | |||
| 2001 | ||||
| 2002 | LLT HalfTy = LLT::scalar(HalfSize); | |||
| 2003 | ||||
| 2004 | Builder.setInstr(MI); | |||
| 2005 | auto Unmerge = Builder.buildUnmerge(HalfTy, SrcReg); | |||
| 2006 | unsigned NarrowShiftAmt = ShiftVal - HalfSize; | |||
| 2007 | ||||
| 2008 | if (MI.getOpcode() == TargetOpcode::G_LSHR) { | |||
| 2009 | Register Narrowed = Unmerge.getReg(1); | |||
| 2010 | ||||
| 2011 | // dst = G_LSHR s64:x, C for C >= 32 | |||
| 2012 | // => | |||
| 2013 | // lo, hi = G_UNMERGE_VALUES x | |||
| 2014 | // dst = G_MERGE_VALUES (G_LSHR hi, C - 32), 0 | |||
| 2015 | ||||
| 2016 | if (NarrowShiftAmt != 0) { | |||
| 2017 | Narrowed = Builder.buildLShr(HalfTy, Narrowed, | |||
| 2018 | Builder.buildConstant(HalfTy, NarrowShiftAmt)).getReg(0); | |||
| 2019 | } | |||
| 2020 | ||||
| 2021 | auto Zero = Builder.buildConstant(HalfTy, 0); | |||
| 2022 | Builder.buildMergeLikeInstr(DstReg, {Narrowed, Zero}); | |||
| 2023 | } else if (MI.getOpcode() == TargetOpcode::G_SHL) { | |||
| 2024 | Register Narrowed = Unmerge.getReg(0); | |||
| 2025 | // dst = G_SHL s64:x, C for C >= 32 | |||
| 2026 | // => | |||
| 2027 | // lo, hi = G_UNMERGE_VALUES x | |||
| 2028 | // dst = G_MERGE_VALUES 0, (G_SHL hi, C - 32) | |||
| 2029 | if (NarrowShiftAmt != 0) { | |||
| 2030 | Narrowed = Builder.buildShl(HalfTy, Narrowed, | |||
| 2031 | Builder.buildConstant(HalfTy, NarrowShiftAmt)).getReg(0); | |||
| 2032 | } | |||
| 2033 | ||||
| 2034 | auto Zero = Builder.buildConstant(HalfTy, 0); | |||
| 2035 | Builder.buildMergeLikeInstr(DstReg, {Zero, Narrowed}); | |||
| 2036 | } else { | |||
| 2037 | assert(MI.getOpcode() == TargetOpcode::G_ASHR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ASHR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ASHR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2037, __extension__ __PRETTY_FUNCTION__)); | |||
| 2038 | auto Hi = Builder.buildAShr( | |||
| 2039 | HalfTy, Unmerge.getReg(1), | |||
| 2040 | Builder.buildConstant(HalfTy, HalfSize - 1)); | |||
| 2041 | ||||
| 2042 | if (ShiftVal == HalfSize) { | |||
| 2043 | // (G_ASHR i64:x, 32) -> | |||
| 2044 | // G_MERGE_VALUES hi_32(x), (G_ASHR hi_32(x), 31) | |||
| 2045 | Builder.buildMergeLikeInstr(DstReg, {Unmerge.getReg(1), Hi}); | |||
| 2046 | } else if (ShiftVal == Size - 1) { | |||
| 2047 | // Don't need a second shift. | |||
| 2048 | // (G_ASHR i64:x, 63) -> | |||
| 2049 | // %narrowed = (G_ASHR hi_32(x), 31) | |||
| 2050 | // G_MERGE_VALUES %narrowed, %narrowed | |||
| 2051 | Builder.buildMergeLikeInstr(DstReg, {Hi, Hi}); | |||
| 2052 | } else { | |||
| 2053 | auto Lo = Builder.buildAShr( | |||
| 2054 | HalfTy, Unmerge.getReg(1), | |||
| 2055 | Builder.buildConstant(HalfTy, ShiftVal - HalfSize)); | |||
| 2056 | ||||
| 2057 | // (G_ASHR i64:x, C) ->, for C >= 32 | |||
| 2058 | // G_MERGE_VALUES (G_ASHR hi_32(x), C - 32), (G_ASHR hi_32(x), 31) | |||
| 2059 | Builder.buildMergeLikeInstr(DstReg, {Lo, Hi}); | |||
| 2060 | } | |||
| 2061 | } | |||
| 2062 | ||||
| 2063 | MI.eraseFromParent(); | |||
| 2064 | } | |||
| 2065 | ||||
| 2066 | bool CombinerHelper::tryCombineShiftToUnmerge(MachineInstr &MI, | |||
| 2067 | unsigned TargetShiftAmount) { | |||
| 2068 | unsigned ShiftAmt; | |||
| 2069 | if (matchCombineShiftToUnmerge(MI, TargetShiftAmount, ShiftAmt)) { | |||
| 2070 | applyCombineShiftToUnmerge(MI, ShiftAmt); | |||
| 2071 | return true; | |||
| 2072 | } | |||
| 2073 | ||||
| 2074 | return false; | |||
| 2075 | } | |||
| 2076 | ||||
| 2077 | bool CombinerHelper::matchCombineI2PToP2I(MachineInstr &MI, Register &Reg) { | |||
| 2078 | assert(MI.getOpcode() == TargetOpcode::G_INTTOPTR && "Expected a G_INTTOPTR")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_INTTOPTR && "Expected a G_INTTOPTR") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_INTTOPTR && \"Expected a G_INTTOPTR\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2078, __extension__ __PRETTY_FUNCTION__)); | |||
| 2079 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2080 | LLT DstTy = MRI.getType(DstReg); | |||
| 2081 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 2082 | return mi_match(SrcReg, MRI, | |||
| 2083 | m_GPtrToInt(m_all_of(m_SpecificType(DstTy), m_Reg(Reg)))); | |||
| 2084 | } | |||
| 2085 | ||||
| 2086 | void CombinerHelper::applyCombineI2PToP2I(MachineInstr &MI, Register &Reg) { | |||
| 2087 | assert(MI.getOpcode() == TargetOpcode::G_INTTOPTR && "Expected a G_INTTOPTR")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_INTTOPTR && "Expected a G_INTTOPTR") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_INTTOPTR && \"Expected a G_INTTOPTR\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2087, __extension__ __PRETTY_FUNCTION__)); | |||
| 2088 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2089 | Builder.setInstr(MI); | |||
| 2090 | Builder.buildCopy(DstReg, Reg); | |||
| 2091 | MI.eraseFromParent(); | |||
| 2092 | } | |||
| 2093 | ||||
| 2094 | void CombinerHelper::applyCombineP2IToI2P(MachineInstr &MI, Register &Reg) { | |||
| 2095 | assert(MI.getOpcode() == TargetOpcode::G_PTRTOINT && "Expected a G_PTRTOINT")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_PTRTOINT && "Expected a G_PTRTOINT") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_PTRTOINT && \"Expected a G_PTRTOINT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2095, __extension__ __PRETTY_FUNCTION__)); | |||
| 2096 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2097 | Builder.setInstr(MI); | |||
| 2098 | Builder.buildZExtOrTrunc(DstReg, Reg); | |||
| 2099 | MI.eraseFromParent(); | |||
| 2100 | } | |||
| 2101 | ||||
| 2102 | bool CombinerHelper::matchCombineAddP2IToPtrAdd( | |||
| 2103 | MachineInstr &MI, std::pair<Register, bool> &PtrReg) { | |||
| 2104 | assert(MI.getOpcode() == TargetOpcode::G_ADD)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ADD ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ADD" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2104, __extension__ __PRETTY_FUNCTION__)); | |||
| 2105 | Register LHS = MI.getOperand(1).getReg(); | |||
| 2106 | Register RHS = MI.getOperand(2).getReg(); | |||
| 2107 | LLT IntTy = MRI.getType(LHS); | |||
| 2108 | ||||
| 2109 | // G_PTR_ADD always has the pointer in the LHS, so we may need to commute the | |||
| 2110 | // instruction. | |||
| 2111 | PtrReg.second = false; | |||
| 2112 | for (Register SrcReg : {LHS, RHS}) { | |||
| 2113 | if (mi_match(SrcReg, MRI, m_GPtrToInt(m_Reg(PtrReg.first)))) { | |||
| 2114 | // Don't handle cases where the integer is implicitly converted to the | |||
| 2115 | // pointer width. | |||
| 2116 | LLT PtrTy = MRI.getType(PtrReg.first); | |||
| 2117 | if (PtrTy.getScalarSizeInBits() == IntTy.getScalarSizeInBits()) | |||
| 2118 | return true; | |||
| 2119 | } | |||
| 2120 | ||||
| 2121 | PtrReg.second = true; | |||
| 2122 | } | |||
| 2123 | ||||
| 2124 | return false; | |||
| 2125 | } | |||
| 2126 | ||||
| 2127 | void CombinerHelper::applyCombineAddP2IToPtrAdd( | |||
| 2128 | MachineInstr &MI, std::pair<Register, bool> &PtrReg) { | |||
| 2129 | Register Dst = MI.getOperand(0).getReg(); | |||
| 2130 | Register LHS = MI.getOperand(1).getReg(); | |||
| 2131 | Register RHS = MI.getOperand(2).getReg(); | |||
| 2132 | ||||
| 2133 | const bool DoCommute = PtrReg.second; | |||
| 2134 | if (DoCommute) | |||
| 2135 | std::swap(LHS, RHS); | |||
| 2136 | LHS = PtrReg.first; | |||
| 2137 | ||||
| 2138 | LLT PtrTy = MRI.getType(LHS); | |||
| 2139 | ||||
| 2140 | Builder.setInstrAndDebugLoc(MI); | |||
| 2141 | auto PtrAdd = Builder.buildPtrAdd(PtrTy, LHS, RHS); | |||
| 2142 | Builder.buildPtrToInt(Dst, PtrAdd); | |||
| 2143 | MI.eraseFromParent(); | |||
| 2144 | } | |||
| 2145 | ||||
| 2146 | bool CombinerHelper::matchCombineConstPtrAddToI2P(MachineInstr &MI, | |||
| 2147 | APInt &NewCst) { | |||
| 2148 | auto &PtrAdd = cast<GPtrAdd>(MI); | |||
| 2149 | Register LHS = PtrAdd.getBaseReg(); | |||
| 2150 | Register RHS = PtrAdd.getOffsetReg(); | |||
| 2151 | MachineRegisterInfo &MRI = Builder.getMF().getRegInfo(); | |||
| 2152 | ||||
| 2153 | if (auto RHSCst = getIConstantVRegVal(RHS, MRI)) { | |||
| 2154 | APInt Cst; | |||
| 2155 | if (mi_match(LHS, MRI, m_GIntToPtr(m_ICst(Cst)))) { | |||
| 2156 | auto DstTy = MRI.getType(PtrAdd.getReg(0)); | |||
| 2157 | // G_INTTOPTR uses zero-extension | |||
| 2158 | NewCst = Cst.zextOrTrunc(DstTy.getSizeInBits()); | |||
| 2159 | NewCst += RHSCst->sextOrTrunc(DstTy.getSizeInBits()); | |||
| 2160 | return true; | |||
| 2161 | } | |||
| 2162 | } | |||
| 2163 | ||||
| 2164 | return false; | |||
| 2165 | } | |||
| 2166 | ||||
| 2167 | void CombinerHelper::applyCombineConstPtrAddToI2P(MachineInstr &MI, | |||
| 2168 | APInt &NewCst) { | |||
| 2169 | auto &PtrAdd = cast<GPtrAdd>(MI); | |||
| 2170 | Register Dst = PtrAdd.getReg(0); | |||
| 2171 | ||||
| 2172 | Builder.setInstrAndDebugLoc(MI); | |||
| 2173 | Builder.buildConstant(Dst, NewCst); | |||
| 2174 | PtrAdd.eraseFromParent(); | |||
| 2175 | } | |||
| 2176 | ||||
| 2177 | bool CombinerHelper::matchCombineAnyExtTrunc(MachineInstr &MI, Register &Reg) { | |||
| 2178 | assert(MI.getOpcode() == TargetOpcode::G_ANYEXT && "Expected a G_ANYEXT")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ANYEXT && "Expected a G_ANYEXT") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ANYEXT && \"Expected a G_ANYEXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2178, __extension__ __PRETTY_FUNCTION__)); | |||
| 2179 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2180 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 2181 | LLT DstTy = MRI.getType(DstReg); | |||
| 2182 | return mi_match(SrcReg, MRI, | |||
| 2183 | m_GTrunc(m_all_of(m_Reg(Reg), m_SpecificType(DstTy)))); | |||
| 2184 | } | |||
| 2185 | ||||
| 2186 | bool CombinerHelper::matchCombineZextTrunc(MachineInstr &MI, Register &Reg) { | |||
| 2187 | assert(MI.getOpcode() == TargetOpcode::G_ZEXT && "Expected a G_ZEXT")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ZEXT && "Expected a G_ZEXT") ? void (0) : __assert_fail ( "MI.getOpcode() == TargetOpcode::G_ZEXT && \"Expected a G_ZEXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2187, __extension__ __PRETTY_FUNCTION__)); | |||
| 2188 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2189 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 2190 | LLT DstTy = MRI.getType(DstReg); | |||
| 2191 | if (mi_match(SrcReg, MRI, | |||
| 2192 | m_GTrunc(m_all_of(m_Reg(Reg), m_SpecificType(DstTy))))) { | |||
| 2193 | unsigned DstSize = DstTy.getScalarSizeInBits(); | |||
| 2194 | unsigned SrcSize = MRI.getType(SrcReg).getScalarSizeInBits(); | |||
| 2195 | return KB->getKnownBits(Reg).countMinLeadingZeros() >= DstSize - SrcSize; | |||
| 2196 | } | |||
| 2197 | return false; | |||
| 2198 | } | |||
| 2199 | ||||
| 2200 | bool CombinerHelper::matchCombineExtOfExt( | |||
| 2201 | MachineInstr &MI, std::tuple<Register, unsigned> &MatchInfo) { | |||
| 2202 | assert((MI.getOpcode() == TargetOpcode::G_ANYEXT ||(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2205, __extension__ __PRETTY_FUNCTION__)) | |||
| 2203 | MI.getOpcode() == TargetOpcode::G_SEXT ||(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2205, __extension__ __PRETTY_FUNCTION__)) | |||
| 2204 | MI.getOpcode() == TargetOpcode::G_ZEXT) &&(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2205, __extension__ __PRETTY_FUNCTION__)) | |||
| 2205 | "Expected a G_[ASZ]EXT")(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2205, __extension__ __PRETTY_FUNCTION__)); | |||
| 2206 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 2207 | MachineInstr *SrcMI = MRI.getVRegDef(SrcReg); | |||
| 2208 | // Match exts with the same opcode, anyext([sz]ext) and sext(zext). | |||
| 2209 | unsigned Opc = MI.getOpcode(); | |||
| 2210 | unsigned SrcOpc = SrcMI->getOpcode(); | |||
| 2211 | if (Opc == SrcOpc || | |||
| 2212 | (Opc == TargetOpcode::G_ANYEXT && | |||
| 2213 | (SrcOpc == TargetOpcode::G_SEXT || SrcOpc == TargetOpcode::G_ZEXT)) || | |||
| 2214 | (Opc == TargetOpcode::G_SEXT && SrcOpc == TargetOpcode::G_ZEXT)) { | |||
| 2215 | MatchInfo = std::make_tuple(SrcMI->getOperand(1).getReg(), SrcOpc); | |||
| 2216 | return true; | |||
| 2217 | } | |||
| 2218 | return false; | |||
| 2219 | } | |||
| 2220 | ||||
| 2221 | void CombinerHelper::applyCombineExtOfExt( | |||
| 2222 | MachineInstr &MI, std::tuple<Register, unsigned> &MatchInfo) { | |||
| 2223 | assert((MI.getOpcode() == TargetOpcode::G_ANYEXT ||(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2226, __extension__ __PRETTY_FUNCTION__)) | |||
| 2224 | MI.getOpcode() == TargetOpcode::G_SEXT ||(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2226, __extension__ __PRETTY_FUNCTION__)) | |||
| 2225 | MI.getOpcode() == TargetOpcode::G_ZEXT) &&(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2226, __extension__ __PRETTY_FUNCTION__)) | |||
| 2226 | "Expected a G_[ASZ]EXT")(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && "Expected a G_[ASZ]EXT") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_ANYEXT || MI.getOpcode() == TargetOpcode::G_SEXT || MI.getOpcode() == TargetOpcode::G_ZEXT) && \"Expected a G_[ASZ]EXT\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2226, __extension__ __PRETTY_FUNCTION__)); | |||
| 2227 | ||||
| 2228 | Register Reg = std::get<0>(MatchInfo); | |||
| 2229 | unsigned SrcExtOp = std::get<1>(MatchInfo); | |||
| 2230 | ||||
| 2231 | // Combine exts with the same opcode. | |||
| 2232 | if (MI.getOpcode() == SrcExtOp) { | |||
| 2233 | Observer.changingInstr(MI); | |||
| 2234 | MI.getOperand(1).setReg(Reg); | |||
| 2235 | Observer.changedInstr(MI); | |||
| 2236 | return; | |||
| 2237 | } | |||
| 2238 | ||||
| 2239 | // Combine: | |||
| 2240 | // - anyext([sz]ext x) to [sz]ext x | |||
| 2241 | // - sext(zext x) to zext x | |||
| 2242 | if (MI.getOpcode() == TargetOpcode::G_ANYEXT || | |||
| 2243 | (MI.getOpcode() == TargetOpcode::G_SEXT && | |||
| 2244 | SrcExtOp == TargetOpcode::G_ZEXT)) { | |||
| 2245 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2246 | Builder.setInstrAndDebugLoc(MI); | |||
| 2247 | Builder.buildInstr(SrcExtOp, {DstReg}, {Reg}); | |||
| 2248 | MI.eraseFromParent(); | |||
| 2249 | } | |||
| 2250 | } | |||
| 2251 | ||||
| 2252 | void CombinerHelper::applyCombineMulByNegativeOne(MachineInstr &MI) { | |||
| 2253 | assert(MI.getOpcode() == TargetOpcode::G_MUL && "Expected a G_MUL")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_MUL && "Expected a G_MUL") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_MUL && \"Expected a G_MUL\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2253, __extension__ __PRETTY_FUNCTION__)); | |||
| 2254 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2255 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 2256 | LLT DstTy = MRI.getType(DstReg); | |||
| 2257 | ||||
| 2258 | Builder.setInstrAndDebugLoc(MI); | |||
| 2259 | Builder.buildSub(DstReg, Builder.buildConstant(DstTy, 0), SrcReg, | |||
| 2260 | MI.getFlags()); | |||
| 2261 | MI.eraseFromParent(); | |||
| 2262 | } | |||
| 2263 | ||||
| 2264 | bool CombinerHelper::matchCombineFAbsOfFNeg(MachineInstr &MI, | |||
| 2265 | BuildFnTy &MatchInfo) { | |||
| 2266 | assert(MI.getOpcode() == TargetOpcode::G_FABS && "Expected a G_FABS")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FABS && "Expected a G_FABS") ? void (0) : __assert_fail ( "MI.getOpcode() == TargetOpcode::G_FABS && \"Expected a G_FABS\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2266, __extension__ __PRETTY_FUNCTION__)); | |||
| 2267 | Register Src = MI.getOperand(1).getReg(); | |||
| 2268 | Register NegSrc; | |||
| 2269 | ||||
| 2270 | if (!mi_match(Src, MRI, m_GFNeg(m_Reg(NegSrc)))) | |||
| 2271 | return false; | |||
| 2272 | ||||
| 2273 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 2274 | Observer.changingInstr(MI); | |||
| 2275 | MI.getOperand(1).setReg(NegSrc); | |||
| 2276 | Observer.changedInstr(MI); | |||
| 2277 | }; | |||
| 2278 | return true; | |||
| 2279 | } | |||
| 2280 | ||||
| 2281 | bool CombinerHelper::matchCombineTruncOfExt( | |||
| 2282 | MachineInstr &MI, std::pair<Register, unsigned> &MatchInfo) { | |||
| 2283 | assert(MI.getOpcode() == TargetOpcode::G_TRUNC && "Expected a G_TRUNC")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_TRUNC && "Expected a G_TRUNC") ? void (0) : __assert_fail ( "MI.getOpcode() == TargetOpcode::G_TRUNC && \"Expected a G_TRUNC\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2283, __extension__ __PRETTY_FUNCTION__)); | |||
| 2284 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 2285 | MachineInstr *SrcMI = MRI.getVRegDef(SrcReg); | |||
| 2286 | unsigned SrcOpc = SrcMI->getOpcode(); | |||
| 2287 | if (SrcOpc == TargetOpcode::G_ANYEXT || SrcOpc == TargetOpcode::G_SEXT || | |||
| 2288 | SrcOpc == TargetOpcode::G_ZEXT) { | |||
| 2289 | MatchInfo = std::make_pair(SrcMI->getOperand(1).getReg(), SrcOpc); | |||
| 2290 | return true; | |||
| 2291 | } | |||
| 2292 | return false; | |||
| 2293 | } | |||
| 2294 | ||||
| 2295 | void CombinerHelper::applyCombineTruncOfExt( | |||
| 2296 | MachineInstr &MI, std::pair<Register, unsigned> &MatchInfo) { | |||
| 2297 | assert(MI.getOpcode() == TargetOpcode::G_TRUNC && "Expected a G_TRUNC")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_TRUNC && "Expected a G_TRUNC") ? void (0) : __assert_fail ( "MI.getOpcode() == TargetOpcode::G_TRUNC && \"Expected a G_TRUNC\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2297, __extension__ __PRETTY_FUNCTION__)); | |||
| 2298 | Register SrcReg = MatchInfo.first; | |||
| 2299 | unsigned SrcExtOp = MatchInfo.second; | |||
| 2300 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2301 | LLT SrcTy = MRI.getType(SrcReg); | |||
| 2302 | LLT DstTy = MRI.getType(DstReg); | |||
| 2303 | if (SrcTy == DstTy) { | |||
| 2304 | MI.eraseFromParent(); | |||
| 2305 | replaceRegWith(MRI, DstReg, SrcReg); | |||
| 2306 | return; | |||
| 2307 | } | |||
| 2308 | Builder.setInstrAndDebugLoc(MI); | |||
| 2309 | if (SrcTy.getSizeInBits() < DstTy.getSizeInBits()) | |||
| 2310 | Builder.buildInstr(SrcExtOp, {DstReg}, {SrcReg}); | |||
| 2311 | else | |||
| 2312 | Builder.buildTrunc(DstReg, SrcReg); | |||
| 2313 | MI.eraseFromParent(); | |||
| 2314 | } | |||
| 2315 | ||||
| 2316 | static LLT getMidVTForTruncRightShiftCombine(LLT ShiftTy, LLT TruncTy) { | |||
| 2317 | const unsigned ShiftSize = ShiftTy.getScalarSizeInBits(); | |||
| 2318 | const unsigned TruncSize = TruncTy.getScalarSizeInBits(); | |||
| 2319 | ||||
| 2320 | // ShiftTy > 32 > TruncTy -> 32 | |||
| 2321 | if (ShiftSize > 32 && TruncSize < 32) | |||
| 2322 | return ShiftTy.changeElementSize(32); | |||
| 2323 | ||||
| 2324 | // TODO: We could also reduce to 16 bits, but that's more target-dependent. | |||
| 2325 | // Some targets like it, some don't, some only like it under certain | |||
| 2326 | // conditions/processor versions, etc. | |||
| 2327 | // A TL hook might be needed for this. | |||
| 2328 | ||||
| 2329 | // Don't combine | |||
| 2330 | return ShiftTy; | |||
| 2331 | } | |||
| 2332 | ||||
| 2333 | bool CombinerHelper::matchCombineTruncOfShift( | |||
| 2334 | MachineInstr &MI, std::pair<MachineInstr *, LLT> &MatchInfo) { | |||
| 2335 | assert(MI.getOpcode() == TargetOpcode::G_TRUNC && "Expected a G_TRUNC")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_TRUNC && "Expected a G_TRUNC") ? void (0) : __assert_fail ( "MI.getOpcode() == TargetOpcode::G_TRUNC && \"Expected a G_TRUNC\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2335, __extension__ __PRETTY_FUNCTION__)); | |||
| 2336 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2337 | Register SrcReg = MI.getOperand(1).getReg(); | |||
| 2338 | ||||
| 2339 | if (!MRI.hasOneNonDBGUse(SrcReg)) | |||
| 2340 | return false; | |||
| 2341 | ||||
| 2342 | LLT SrcTy = MRI.getType(SrcReg); | |||
| 2343 | LLT DstTy = MRI.getType(DstReg); | |||
| 2344 | ||||
| 2345 | MachineInstr *SrcMI = getDefIgnoringCopies(SrcReg, MRI); | |||
| 2346 | const auto &TL = getTargetLowering(); | |||
| 2347 | ||||
| 2348 | LLT NewShiftTy; | |||
| 2349 | switch (SrcMI->getOpcode()) { | |||
| 2350 | default: | |||
| 2351 | return false; | |||
| 2352 | case TargetOpcode::G_SHL: { | |||
| 2353 | NewShiftTy = DstTy; | |||
| 2354 | ||||
| 2355 | // Make sure new shift amount is legal. | |||
| 2356 | KnownBits Known = KB->getKnownBits(SrcMI->getOperand(2).getReg()); | |||
| 2357 | if (Known.getMaxValue().uge(NewShiftTy.getScalarSizeInBits())) | |||
| 2358 | return false; | |||
| 2359 | break; | |||
| 2360 | } | |||
| 2361 | case TargetOpcode::G_LSHR: | |||
| 2362 | case TargetOpcode::G_ASHR: { | |||
| 2363 | // For right shifts, we conservatively do not do the transform if the TRUNC | |||
| 2364 | // has any STORE users. The reason is that if we change the type of the | |||
| 2365 | // shift, we may break the truncstore combine. | |||
| 2366 | // | |||
| 2367 | // TODO: Fix truncstore combine to handle (trunc(lshr (trunc x), k)). | |||
| 2368 | for (auto &User : MRI.use_instructions(DstReg)) | |||
| 2369 | if (User.getOpcode() == TargetOpcode::G_STORE) | |||
| 2370 | return false; | |||
| 2371 | ||||
| 2372 | NewShiftTy = getMidVTForTruncRightShiftCombine(SrcTy, DstTy); | |||
| 2373 | if (NewShiftTy == SrcTy) | |||
| 2374 | return false; | |||
| 2375 | ||||
| 2376 | // Make sure we won't lose information by truncating the high bits. | |||
| 2377 | KnownBits Known = KB->getKnownBits(SrcMI->getOperand(2).getReg()); | |||
| 2378 | if (Known.getMaxValue().ugt(NewShiftTy.getScalarSizeInBits() - | |||
| 2379 | DstTy.getScalarSizeInBits())) | |||
| 2380 | return false; | |||
| 2381 | break; | |||
| 2382 | } | |||
| 2383 | } | |||
| 2384 | ||||
| 2385 | if (!isLegalOrBeforeLegalizer( | |||
| 2386 | {SrcMI->getOpcode(), | |||
| 2387 | {NewShiftTy, TL.getPreferredShiftAmountTy(NewShiftTy)}})) | |||
| 2388 | return false; | |||
| 2389 | ||||
| 2390 | MatchInfo = std::make_pair(SrcMI, NewShiftTy); | |||
| 2391 | return true; | |||
| 2392 | } | |||
| 2393 | ||||
| 2394 | void CombinerHelper::applyCombineTruncOfShift( | |||
| 2395 | MachineInstr &MI, std::pair<MachineInstr *, LLT> &MatchInfo) { | |||
| 2396 | Builder.setInstrAndDebugLoc(MI); | |||
| 2397 | ||||
| 2398 | MachineInstr *ShiftMI = MatchInfo.first; | |||
| 2399 | LLT NewShiftTy = MatchInfo.second; | |||
| 2400 | ||||
| 2401 | Register Dst = MI.getOperand(0).getReg(); | |||
| 2402 | LLT DstTy = MRI.getType(Dst); | |||
| 2403 | ||||
| 2404 | Register ShiftAmt = ShiftMI->getOperand(2).getReg(); | |||
| 2405 | Register ShiftSrc = ShiftMI->getOperand(1).getReg(); | |||
| 2406 | ShiftSrc = Builder.buildTrunc(NewShiftTy, ShiftSrc).getReg(0); | |||
| 2407 | ||||
| 2408 | Register NewShift = | |||
| 2409 | Builder | |||
| 2410 | .buildInstr(ShiftMI->getOpcode(), {NewShiftTy}, {ShiftSrc, ShiftAmt}) | |||
| 2411 | .getReg(0); | |||
| 2412 | ||||
| 2413 | if (NewShiftTy == DstTy) | |||
| 2414 | replaceRegWith(MRI, Dst, NewShift); | |||
| 2415 | else | |||
| 2416 | Builder.buildTrunc(Dst, NewShift); | |||
| 2417 | ||||
| 2418 | eraseInst(MI); | |||
| 2419 | } | |||
| 2420 | ||||
| 2421 | bool CombinerHelper::matchAnyExplicitUseIsUndef(MachineInstr &MI) { | |||
| 2422 | return any_of(MI.explicit_uses(), [this](const MachineOperand &MO) { | |||
| 2423 | return MO.isReg() && | |||
| 2424 | getOpcodeDef(TargetOpcode::G_IMPLICIT_DEF, MO.getReg(), MRI); | |||
| 2425 | }); | |||
| 2426 | } | |||
| 2427 | ||||
| 2428 | bool CombinerHelper::matchAllExplicitUsesAreUndef(MachineInstr &MI) { | |||
| 2429 | return all_of(MI.explicit_uses(), [this](const MachineOperand &MO) { | |||
| 2430 | return !MO.isReg() || | |||
| 2431 | getOpcodeDef(TargetOpcode::G_IMPLICIT_DEF, MO.getReg(), MRI); | |||
| 2432 | }); | |||
| 2433 | } | |||
| 2434 | ||||
| 2435 | bool CombinerHelper::matchUndefShuffleVectorMask(MachineInstr &MI) { | |||
| 2436 | assert(MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SHUFFLE_VECTOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2436, __extension__ __PRETTY_FUNCTION__)); | |||
| 2437 | ArrayRef<int> Mask = MI.getOperand(3).getShuffleMask(); | |||
| 2438 | return all_of(Mask, [](int Elt) { return Elt < 0; }); | |||
| 2439 | } | |||
| 2440 | ||||
| 2441 | bool CombinerHelper::matchUndefStore(MachineInstr &MI) { | |||
| 2442 | assert(MI.getOpcode() == TargetOpcode::G_STORE)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_STORE ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_STORE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2442, __extension__ __PRETTY_FUNCTION__)); | |||
| 2443 | return getOpcodeDef(TargetOpcode::G_IMPLICIT_DEF, MI.getOperand(0).getReg(), | |||
| 2444 | MRI); | |||
| 2445 | } | |||
| 2446 | ||||
| 2447 | bool CombinerHelper::matchUndefSelectCmp(MachineInstr &MI) { | |||
| 2448 | assert(MI.getOpcode() == TargetOpcode::G_SELECT)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SELECT ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SELECT" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2448, __extension__ __PRETTY_FUNCTION__)); | |||
| 2449 | return getOpcodeDef(TargetOpcode::G_IMPLICIT_DEF, MI.getOperand(1).getReg(), | |||
| 2450 | MRI); | |||
| 2451 | } | |||
| 2452 | ||||
| 2453 | bool CombinerHelper::matchInsertExtractVecEltOutOfBounds(MachineInstr &MI) { | |||
| 2454 | assert((MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT ||(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT || MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT) && "Expected an insert/extract element op") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT || MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT) && \"Expected an insert/extract element op\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2456, __extension__ __PRETTY_FUNCTION__)) | |||
| 2455 | MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT) &&(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT || MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT) && "Expected an insert/extract element op") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT || MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT) && \"Expected an insert/extract element op\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2456, __extension__ __PRETTY_FUNCTION__)) | |||
| 2456 | "Expected an insert/extract element op")(static_cast <bool> ((MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT || MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT) && "Expected an insert/extract element op") ? void (0) : __assert_fail ("(MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT || MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT) && \"Expected an insert/extract element op\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2456, __extension__ __PRETTY_FUNCTION__)); | |||
| 2457 | LLT VecTy = MRI.getType(MI.getOperand(1).getReg()); | |||
| 2458 | unsigned IdxIdx = | |||
| 2459 | MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT ? 2 : 3; | |||
| 2460 | auto Idx = getIConstantVRegVal(MI.getOperand(IdxIdx).getReg(), MRI); | |||
| 2461 | if (!Idx) | |||
| 2462 | return false; | |||
| 2463 | return Idx->getZExtValue() >= VecTy.getNumElements(); | |||
| 2464 | } | |||
| 2465 | ||||
| 2466 | bool CombinerHelper::matchConstantSelectCmp(MachineInstr &MI, unsigned &OpIdx) { | |||
| 2467 | GSelect &SelMI = cast<GSelect>(MI); | |||
| 2468 | auto Cst = | |||
| 2469 | isConstantOrConstantSplatVector(*MRI.getVRegDef(SelMI.getCondReg()), MRI); | |||
| 2470 | if (!Cst) | |||
| 2471 | return false; | |||
| 2472 | OpIdx = Cst->isZero() ? 3 : 2; | |||
| 2473 | return true; | |||
| 2474 | } | |||
| 2475 | ||||
| 2476 | bool CombinerHelper::eraseInst(MachineInstr &MI) { | |||
| 2477 | MI.eraseFromParent(); | |||
| 2478 | return true; | |||
| 2479 | } | |||
| 2480 | ||||
| 2481 | bool CombinerHelper::matchEqualDefs(const MachineOperand &MOP1, | |||
| 2482 | const MachineOperand &MOP2) { | |||
| 2483 | if (!MOP1.isReg() || !MOP2.isReg()) | |||
| 2484 | return false; | |||
| 2485 | auto InstAndDef1 = getDefSrcRegIgnoringCopies(MOP1.getReg(), MRI); | |||
| 2486 | if (!InstAndDef1) | |||
| 2487 | return false; | |||
| 2488 | auto InstAndDef2 = getDefSrcRegIgnoringCopies(MOP2.getReg(), MRI); | |||
| 2489 | if (!InstAndDef2) | |||
| 2490 | return false; | |||
| 2491 | MachineInstr *I1 = InstAndDef1->MI; | |||
| 2492 | MachineInstr *I2 = InstAndDef2->MI; | |||
| 2493 | ||||
| 2494 | // Handle a case like this: | |||
| 2495 | // | |||
| 2496 | // %0:_(s64), %1:_(s64) = G_UNMERGE_VALUES %2:_(<2 x s64>) | |||
| 2497 | // | |||
| 2498 | // Even though %0 and %1 are produced by the same instruction they are not | |||
| 2499 | // the same values. | |||
| 2500 | if (I1 == I2) | |||
| 2501 | return MOP1.getReg() == MOP2.getReg(); | |||
| 2502 | ||||
| 2503 | // If we have an instruction which loads or stores, we can't guarantee that | |||
| 2504 | // it is identical. | |||
| 2505 | // | |||
| 2506 | // For example, we may have | |||
| 2507 | // | |||
| 2508 | // %x1 = G_LOAD %addr (load N from @somewhere) | |||
| 2509 | // ... | |||
| 2510 | // call @foo | |||
| 2511 | // ... | |||
| 2512 | // %x2 = G_LOAD %addr (load N from @somewhere) | |||
| 2513 | // ... | |||
| 2514 | // %or = G_OR %x1, %x2 | |||
| 2515 | // | |||
| 2516 | // It's possible that @foo will modify whatever lives at the address we're | |||
| 2517 | // loading from. To be safe, let's just assume that all loads and stores | |||
| 2518 | // are different (unless we have something which is guaranteed to not | |||
| 2519 | // change.) | |||
| 2520 | if (I1->mayLoadOrStore() && !I1->isDereferenceableInvariantLoad()) | |||
| 2521 | return false; | |||
| 2522 | ||||
| 2523 | // If both instructions are loads or stores, they are equal only if both | |||
| 2524 | // are dereferenceable invariant loads with the same number of bits. | |||
| 2525 | if (I1->mayLoadOrStore() && I2->mayLoadOrStore()) { | |||
| 2526 | GLoadStore *LS1 = dyn_cast<GLoadStore>(I1); | |||
| 2527 | GLoadStore *LS2 = dyn_cast<GLoadStore>(I2); | |||
| 2528 | if (!LS1 || !LS2) | |||
| 2529 | return false; | |||
| 2530 | ||||
| 2531 | if (!I2->isDereferenceableInvariantLoad() || | |||
| 2532 | (LS1->getMemSizeInBits() != LS2->getMemSizeInBits())) | |||
| 2533 | return false; | |||
| 2534 | } | |||
| 2535 | ||||
| 2536 | // Check for physical registers on the instructions first to avoid cases | |||
| 2537 | // like this: | |||
| 2538 | // | |||
| 2539 | // %a = COPY $physreg | |||
| 2540 | // ... | |||
| 2541 | // SOMETHING implicit-def $physreg | |||
| 2542 | // ... | |||
| 2543 | // %b = COPY $physreg | |||
| 2544 | // | |||
| 2545 | // These copies are not equivalent. | |||
| 2546 | if (any_of(I1->uses(), [](const MachineOperand &MO) { | |||
| 2547 | return MO.isReg() && MO.getReg().isPhysical(); | |||
| 2548 | })) { | |||
| 2549 | // Check if we have a case like this: | |||
| 2550 | // | |||
| 2551 | // %a = COPY $physreg | |||
| 2552 | // %b = COPY %a | |||
| 2553 | // | |||
| 2554 | // In this case, I1 and I2 will both be equal to %a = COPY $physreg. | |||
| 2555 | // From that, we know that they must have the same value, since they must | |||
| 2556 | // have come from the same COPY. | |||
| 2557 | return I1->isIdenticalTo(*I2); | |||
| 2558 | } | |||
| 2559 | ||||
| 2560 | // We don't have any physical registers, so we don't necessarily need the | |||
| 2561 | // same vreg defs. | |||
| 2562 | // | |||
| 2563 | // On the off-chance that there's some target instruction feeding into the | |||
| 2564 | // instruction, let's use produceSameValue instead of isIdenticalTo. | |||
| 2565 | if (Builder.getTII().produceSameValue(*I1, *I2, &MRI)) { | |||
| 2566 | // Handle instructions with multiple defs that produce same values. Values | |||
| 2567 | // are same for operands with same index. | |||
| 2568 | // %0:_(s8), %1:_(s8), %2:_(s8), %3:_(s8) = G_UNMERGE_VALUES %4:_(<4 x s8>) | |||
| 2569 | // %5:_(s8), %6:_(s8), %7:_(s8), %8:_(s8) = G_UNMERGE_VALUES %4:_(<4 x s8>) | |||
| 2570 | // I1 and I2 are different instructions but produce same values, | |||
| 2571 | // %1 and %6 are same, %1 and %7 are not the same value. | |||
| 2572 | return I1->findRegisterDefOperandIdx(InstAndDef1->Reg) == | |||
| 2573 | I2->findRegisterDefOperandIdx(InstAndDef2->Reg); | |||
| 2574 | } | |||
| 2575 | return false; | |||
| 2576 | } | |||
| 2577 | ||||
| 2578 | bool CombinerHelper::matchConstantOp(const MachineOperand &MOP, int64_t C) { | |||
| 2579 | if (!MOP.isReg()) | |||
| 2580 | return false; | |||
| 2581 | auto *MI = MRI.getVRegDef(MOP.getReg()); | |||
| 2582 | auto MaybeCst = isConstantOrConstantSplatVector(*MI, MRI); | |||
| 2583 | return MaybeCst && MaybeCst->getBitWidth() <= 64 && | |||
| 2584 | MaybeCst->getSExtValue() == C; | |||
| 2585 | } | |||
| 2586 | ||||
| 2587 | bool CombinerHelper::replaceSingleDefInstWithOperand(MachineInstr &MI, | |||
| 2588 | unsigned OpIdx) { | |||
| 2589 | assert(MI.getNumExplicitDefs() == 1 && "Expected one explicit def?")(static_cast <bool> (MI.getNumExplicitDefs() == 1 && "Expected one explicit def?") ? void (0) : __assert_fail ("MI.getNumExplicitDefs() == 1 && \"Expected one explicit def?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2589, __extension__ __PRETTY_FUNCTION__)); | |||
| 2590 | Register OldReg = MI.getOperand(0).getReg(); | |||
| 2591 | Register Replacement = MI.getOperand(OpIdx).getReg(); | |||
| 2592 | assert(canReplaceReg(OldReg, Replacement, MRI) && "Cannot replace register?")(static_cast <bool> (canReplaceReg(OldReg, Replacement, MRI) && "Cannot replace register?") ? void (0) : __assert_fail ("canReplaceReg(OldReg, Replacement, MRI) && \"Cannot replace register?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2592, __extension__ __PRETTY_FUNCTION__)); | |||
| 2593 | MI.eraseFromParent(); | |||
| 2594 | replaceRegWith(MRI, OldReg, Replacement); | |||
| 2595 | return true; | |||
| 2596 | } | |||
| 2597 | ||||
| 2598 | bool CombinerHelper::replaceSingleDefInstWithReg(MachineInstr &MI, | |||
| 2599 | Register Replacement) { | |||
| 2600 | assert(MI.getNumExplicitDefs() == 1 && "Expected one explicit def?")(static_cast <bool> (MI.getNumExplicitDefs() == 1 && "Expected one explicit def?") ? void (0) : __assert_fail ("MI.getNumExplicitDefs() == 1 && \"Expected one explicit def?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2600, __extension__ __PRETTY_FUNCTION__)); | |||
| 2601 | Register OldReg = MI.getOperand(0).getReg(); | |||
| 2602 | assert(canReplaceReg(OldReg, Replacement, MRI) && "Cannot replace register?")(static_cast <bool> (canReplaceReg(OldReg, Replacement, MRI) && "Cannot replace register?") ? void (0) : __assert_fail ("canReplaceReg(OldReg, Replacement, MRI) && \"Cannot replace register?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2602, __extension__ __PRETTY_FUNCTION__)); | |||
| 2603 | MI.eraseFromParent(); | |||
| 2604 | replaceRegWith(MRI, OldReg, Replacement); | |||
| 2605 | return true; | |||
| 2606 | } | |||
| 2607 | ||||
| 2608 | bool CombinerHelper::matchSelectSameVal(MachineInstr &MI) { | |||
| 2609 | assert(MI.getOpcode() == TargetOpcode::G_SELECT)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SELECT ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SELECT" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2609, __extension__ __PRETTY_FUNCTION__)); | |||
| 2610 | // Match (cond ? x : x) | |||
| 2611 | return matchEqualDefs(MI.getOperand(2), MI.getOperand(3)) && | |||
| 2612 | canReplaceReg(MI.getOperand(0).getReg(), MI.getOperand(2).getReg(), | |||
| 2613 | MRI); | |||
| 2614 | } | |||
| 2615 | ||||
| 2616 | bool CombinerHelper::matchBinOpSameVal(MachineInstr &MI) { | |||
| 2617 | return matchEqualDefs(MI.getOperand(1), MI.getOperand(2)) && | |||
| 2618 | canReplaceReg(MI.getOperand(0).getReg(), MI.getOperand(1).getReg(), | |||
| 2619 | MRI); | |||
| 2620 | } | |||
| 2621 | ||||
| 2622 | bool CombinerHelper::matchOperandIsZero(MachineInstr &MI, unsigned OpIdx) { | |||
| 2623 | return matchConstantOp(MI.getOperand(OpIdx), 0) && | |||
| 2624 | canReplaceReg(MI.getOperand(0).getReg(), MI.getOperand(OpIdx).getReg(), | |||
| 2625 | MRI); | |||
| 2626 | } | |||
| 2627 | ||||
| 2628 | bool CombinerHelper::matchOperandIsUndef(MachineInstr &MI, unsigned OpIdx) { | |||
| 2629 | MachineOperand &MO = MI.getOperand(OpIdx); | |||
| 2630 | return MO.isReg() && | |||
| 2631 | getOpcodeDef(TargetOpcode::G_IMPLICIT_DEF, MO.getReg(), MRI); | |||
| 2632 | } | |||
| 2633 | ||||
| 2634 | bool CombinerHelper::matchOperandIsKnownToBeAPowerOfTwo(MachineInstr &MI, | |||
| 2635 | unsigned OpIdx) { | |||
| 2636 | MachineOperand &MO = MI.getOperand(OpIdx); | |||
| 2637 | return isKnownToBeAPowerOfTwo(MO.getReg(), MRI, KB); | |||
| 2638 | } | |||
| 2639 | ||||
| 2640 | bool CombinerHelper::replaceInstWithFConstant(MachineInstr &MI, double C) { | |||
| 2641 | assert(MI.getNumDefs() == 1 && "Expected only one def?")(static_cast <bool> (MI.getNumDefs() == 1 && "Expected only one def?" ) ? void (0) : __assert_fail ("MI.getNumDefs() == 1 && \"Expected only one def?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2641, __extension__ __PRETTY_FUNCTION__)); | |||
| 2642 | Builder.setInstr(MI); | |||
| 2643 | Builder.buildFConstant(MI.getOperand(0), C); | |||
| 2644 | MI.eraseFromParent(); | |||
| 2645 | return true; | |||
| 2646 | } | |||
| 2647 | ||||
| 2648 | bool CombinerHelper::replaceInstWithConstant(MachineInstr &MI, int64_t C) { | |||
| 2649 | assert(MI.getNumDefs() == 1 && "Expected only one def?")(static_cast <bool> (MI.getNumDefs() == 1 && "Expected only one def?" ) ? void (0) : __assert_fail ("MI.getNumDefs() == 1 && \"Expected only one def?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2649, __extension__ __PRETTY_FUNCTION__)); | |||
| 2650 | Builder.setInstr(MI); | |||
| 2651 | Builder.buildConstant(MI.getOperand(0), C); | |||
| 2652 | MI.eraseFromParent(); | |||
| 2653 | return true; | |||
| 2654 | } | |||
| 2655 | ||||
| 2656 | bool CombinerHelper::replaceInstWithConstant(MachineInstr &MI, APInt C) { | |||
| 2657 | assert(MI.getNumDefs() == 1 && "Expected only one def?")(static_cast <bool> (MI.getNumDefs() == 1 && "Expected only one def?" ) ? void (0) : __assert_fail ("MI.getNumDefs() == 1 && \"Expected only one def?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2657, __extension__ __PRETTY_FUNCTION__)); | |||
| 2658 | Builder.setInstr(MI); | |||
| 2659 | Builder.buildConstant(MI.getOperand(0), C); | |||
| 2660 | MI.eraseFromParent(); | |||
| 2661 | return true; | |||
| 2662 | } | |||
| 2663 | ||||
| 2664 | bool CombinerHelper::replaceInstWithUndef(MachineInstr &MI) { | |||
| 2665 | assert(MI.getNumDefs() == 1 && "Expected only one def?")(static_cast <bool> (MI.getNumDefs() == 1 && "Expected only one def?" ) ? void (0) : __assert_fail ("MI.getNumDefs() == 1 && \"Expected only one def?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2665, __extension__ __PRETTY_FUNCTION__)); | |||
| 2666 | Builder.setInstr(MI); | |||
| 2667 | Builder.buildUndef(MI.getOperand(0)); | |||
| 2668 | MI.eraseFromParent(); | |||
| 2669 | return true; | |||
| 2670 | } | |||
| 2671 | ||||
| 2672 | bool CombinerHelper::matchSimplifyAddToSub( | |||
| 2673 | MachineInstr &MI, std::tuple<Register, Register> &MatchInfo) { | |||
| 2674 | Register LHS = MI.getOperand(1).getReg(); | |||
| 2675 | Register RHS = MI.getOperand(2).getReg(); | |||
| 2676 | Register &NewLHS = std::get<0>(MatchInfo); | |||
| 2677 | Register &NewRHS = std::get<1>(MatchInfo); | |||
| 2678 | ||||
| 2679 | // Helper lambda to check for opportunities for | |||
| 2680 | // ((0-A) + B) -> B - A | |||
| 2681 | // (A + (0-B)) -> A - B | |||
| 2682 | auto CheckFold = [&](Register &MaybeSub, Register &MaybeNewLHS) { | |||
| 2683 | if (!mi_match(MaybeSub, MRI, m_Neg(m_Reg(NewRHS)))) | |||
| 2684 | return false; | |||
| 2685 | NewLHS = MaybeNewLHS; | |||
| 2686 | return true; | |||
| 2687 | }; | |||
| 2688 | ||||
| 2689 | return CheckFold(LHS, RHS) || CheckFold(RHS, LHS); | |||
| 2690 | } | |||
| 2691 | ||||
| 2692 | bool CombinerHelper::matchCombineInsertVecElts( | |||
| 2693 | MachineInstr &MI, SmallVectorImpl<Register> &MatchInfo) { | |||
| 2694 | assert(MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT &&(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT && "Invalid opcode") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT && \"Invalid opcode\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2695, __extension__ __PRETTY_FUNCTION__)) | |||
| 2695 | "Invalid opcode")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT && "Invalid opcode") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT && \"Invalid opcode\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2695, __extension__ __PRETTY_FUNCTION__)); | |||
| 2696 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 2697 | LLT DstTy = MRI.getType(DstReg); | |||
| 2698 | assert(DstTy.isVector() && "Invalid G_INSERT_VECTOR_ELT?")(static_cast <bool> (DstTy.isVector() && "Invalid G_INSERT_VECTOR_ELT?" ) ? void (0) : __assert_fail ("DstTy.isVector() && \"Invalid G_INSERT_VECTOR_ELT?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2698, __extension__ __PRETTY_FUNCTION__)); | |||
| 2699 | unsigned NumElts = DstTy.getNumElements(); | |||
| 2700 | // If this MI is part of a sequence of insert_vec_elts, then | |||
| 2701 | // don't do the combine in the middle of the sequence. | |||
| 2702 | if (MRI.hasOneUse(DstReg) && MRI.use_instr_begin(DstReg)->getOpcode() == | |||
| 2703 | TargetOpcode::G_INSERT_VECTOR_ELT) | |||
| 2704 | return false; | |||
| 2705 | MachineInstr *CurrInst = &MI; | |||
| 2706 | MachineInstr *TmpInst; | |||
| 2707 | int64_t IntImm; | |||
| 2708 | Register TmpReg; | |||
| 2709 | MatchInfo.resize(NumElts); | |||
| 2710 | while (mi_match( | |||
| 2711 | CurrInst->getOperand(0).getReg(), MRI, | |||
| 2712 | m_GInsertVecElt(m_MInstr(TmpInst), m_Reg(TmpReg), m_ICst(IntImm)))) { | |||
| 2713 | if (IntImm >= NumElts || IntImm < 0) | |||
| 2714 | return false; | |||
| 2715 | if (!MatchInfo[IntImm]) | |||
| 2716 | MatchInfo[IntImm] = TmpReg; | |||
| 2717 | CurrInst = TmpInst; | |||
| 2718 | } | |||
| 2719 | // Variable index. | |||
| 2720 | if (CurrInst->getOpcode() == TargetOpcode::G_INSERT_VECTOR_ELT) | |||
| 2721 | return false; | |||
| 2722 | if (TmpInst->getOpcode() == TargetOpcode::G_BUILD_VECTOR) { | |||
| 2723 | for (unsigned I = 1; I < TmpInst->getNumOperands(); ++I) { | |||
| 2724 | if (!MatchInfo[I - 1].isValid()) | |||
| 2725 | MatchInfo[I - 1] = TmpInst->getOperand(I).getReg(); | |||
| 2726 | } | |||
| 2727 | return true; | |||
| 2728 | } | |||
| 2729 | // If we didn't end in a G_IMPLICIT_DEF, bail out. | |||
| 2730 | return TmpInst->getOpcode() == TargetOpcode::G_IMPLICIT_DEF; | |||
| 2731 | } | |||
| 2732 | ||||
| 2733 | void CombinerHelper::applyCombineInsertVecElts( | |||
| 2734 | MachineInstr &MI, SmallVectorImpl<Register> &MatchInfo) { | |||
| 2735 | Builder.setInstr(MI); | |||
| 2736 | Register UndefReg; | |||
| 2737 | auto GetUndef = [&]() { | |||
| 2738 | if (UndefReg) | |||
| 2739 | return UndefReg; | |||
| 2740 | LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 2741 | UndefReg = Builder.buildUndef(DstTy.getScalarType()).getReg(0); | |||
| 2742 | return UndefReg; | |||
| 2743 | }; | |||
| 2744 | for (unsigned I = 0; I < MatchInfo.size(); ++I) { | |||
| 2745 | if (!MatchInfo[I]) | |||
| 2746 | MatchInfo[I] = GetUndef(); | |||
| 2747 | } | |||
| 2748 | Builder.buildBuildVector(MI.getOperand(0).getReg(), MatchInfo); | |||
| 2749 | MI.eraseFromParent(); | |||
| 2750 | } | |||
| 2751 | ||||
| 2752 | void CombinerHelper::applySimplifyAddToSub( | |||
| 2753 | MachineInstr &MI, std::tuple<Register, Register> &MatchInfo) { | |||
| 2754 | Builder.setInstr(MI); | |||
| 2755 | Register SubLHS, SubRHS; | |||
| 2756 | std::tie(SubLHS, SubRHS) = MatchInfo; | |||
| 2757 | Builder.buildSub(MI.getOperand(0).getReg(), SubLHS, SubRHS); | |||
| 2758 | MI.eraseFromParent(); | |||
| 2759 | } | |||
| 2760 | ||||
| 2761 | bool CombinerHelper::matchHoistLogicOpWithSameOpcodeHands( | |||
| 2762 | MachineInstr &MI, InstructionStepsMatchInfo &MatchInfo) { | |||
| 2763 | // Matches: logic (hand x, ...), (hand y, ...) -> hand (logic x, y), ... | |||
| 2764 | // | |||
| 2765 | // Creates the new hand + logic instruction (but does not insert them.) | |||
| 2766 | // | |||
| 2767 | // On success, MatchInfo is populated with the new instructions. These are | |||
| 2768 | // inserted in applyHoistLogicOpWithSameOpcodeHands. | |||
| 2769 | unsigned LogicOpcode = MI.getOpcode(); | |||
| 2770 | assert(LogicOpcode == TargetOpcode::G_AND ||(static_cast <bool> (LogicOpcode == TargetOpcode::G_AND || LogicOpcode == TargetOpcode::G_OR || LogicOpcode == TargetOpcode ::G_XOR) ? void (0) : __assert_fail ("LogicOpcode == TargetOpcode::G_AND || LogicOpcode == TargetOpcode::G_OR || LogicOpcode == TargetOpcode::G_XOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2772, __extension__ __PRETTY_FUNCTION__)) | |||
| 2771 | LogicOpcode == TargetOpcode::G_OR ||(static_cast <bool> (LogicOpcode == TargetOpcode::G_AND || LogicOpcode == TargetOpcode::G_OR || LogicOpcode == TargetOpcode ::G_XOR) ? void (0) : __assert_fail ("LogicOpcode == TargetOpcode::G_AND || LogicOpcode == TargetOpcode::G_OR || LogicOpcode == TargetOpcode::G_XOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2772, __extension__ __PRETTY_FUNCTION__)) | |||
| 2772 | LogicOpcode == TargetOpcode::G_XOR)(static_cast <bool> (LogicOpcode == TargetOpcode::G_AND || LogicOpcode == TargetOpcode::G_OR || LogicOpcode == TargetOpcode ::G_XOR) ? void (0) : __assert_fail ("LogicOpcode == TargetOpcode::G_AND || LogicOpcode == TargetOpcode::G_OR || LogicOpcode == TargetOpcode::G_XOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2772, __extension__ __PRETTY_FUNCTION__)); | |||
| 2773 | MachineIRBuilder MIB(MI); | |||
| 2774 | Register Dst = MI.getOperand(0).getReg(); | |||
| 2775 | Register LHSReg = MI.getOperand(1).getReg(); | |||
| 2776 | Register RHSReg = MI.getOperand(2).getReg(); | |||
| 2777 | ||||
| 2778 | // Don't recompute anything. | |||
| 2779 | if (!MRI.hasOneNonDBGUse(LHSReg) || !MRI.hasOneNonDBGUse(RHSReg)) | |||
| 2780 | return false; | |||
| 2781 | ||||
| 2782 | // Make sure we have (hand x, ...), (hand y, ...) | |||
| 2783 | MachineInstr *LeftHandInst = getDefIgnoringCopies(LHSReg, MRI); | |||
| 2784 | MachineInstr *RightHandInst = getDefIgnoringCopies(RHSReg, MRI); | |||
| 2785 | if (!LeftHandInst || !RightHandInst) | |||
| 2786 | return false; | |||
| 2787 | unsigned HandOpcode = LeftHandInst->getOpcode(); | |||
| 2788 | if (HandOpcode != RightHandInst->getOpcode()) | |||
| 2789 | return false; | |||
| 2790 | if (!LeftHandInst->getOperand(1).isReg() || | |||
| 2791 | !RightHandInst->getOperand(1).isReg()) | |||
| 2792 | return false; | |||
| 2793 | ||||
| 2794 | // Make sure the types match up, and if we're doing this post-legalization, | |||
| 2795 | // we end up with legal types. | |||
| 2796 | Register X = LeftHandInst->getOperand(1).getReg(); | |||
| 2797 | Register Y = RightHandInst->getOperand(1).getReg(); | |||
| 2798 | LLT XTy = MRI.getType(X); | |||
| 2799 | LLT YTy = MRI.getType(Y); | |||
| 2800 | if (!XTy.isValid() || XTy != YTy) | |||
| 2801 | return false; | |||
| 2802 | ||||
| 2803 | // Optional extra source register. | |||
| 2804 | Register ExtraHandOpSrcReg; | |||
| 2805 | switch (HandOpcode) { | |||
| 2806 | default: | |||
| 2807 | return false; | |||
| 2808 | case TargetOpcode::G_ANYEXT: | |||
| 2809 | case TargetOpcode::G_SEXT: | |||
| 2810 | case TargetOpcode::G_ZEXT: { | |||
| 2811 | // Match: logic (ext X), (ext Y) --> ext (logic X, Y) | |||
| 2812 | break; | |||
| 2813 | } | |||
| 2814 | case TargetOpcode::G_AND: | |||
| 2815 | case TargetOpcode::G_ASHR: | |||
| 2816 | case TargetOpcode::G_LSHR: | |||
| 2817 | case TargetOpcode::G_SHL: { | |||
| 2818 | // Match: logic (binop x, z), (binop y, z) -> binop (logic x, y), z | |||
| 2819 | MachineOperand &ZOp = LeftHandInst->getOperand(2); | |||
| 2820 | if (!matchEqualDefs(ZOp, RightHandInst->getOperand(2))) | |||
| 2821 | return false; | |||
| 2822 | ExtraHandOpSrcReg = ZOp.getReg(); | |||
| 2823 | break; | |||
| 2824 | } | |||
| 2825 | } | |||
| 2826 | ||||
| 2827 | if (!isLegalOrBeforeLegalizer({LogicOpcode, {XTy, YTy}})) | |||
| 2828 | return false; | |||
| 2829 | ||||
| 2830 | // Record the steps to build the new instructions. | |||
| 2831 | // | |||
| 2832 | // Steps to build (logic x, y) | |||
| 2833 | auto NewLogicDst = MRI.createGenericVirtualRegister(XTy); | |||
| 2834 | OperandBuildSteps LogicBuildSteps = { | |||
| 2835 | [=](MachineInstrBuilder &MIB) { MIB.addDef(NewLogicDst); }, | |||
| 2836 | [=](MachineInstrBuilder &MIB) { MIB.addReg(X); }, | |||
| 2837 | [=](MachineInstrBuilder &MIB) { MIB.addReg(Y); }}; | |||
| 2838 | InstructionBuildSteps LogicSteps(LogicOpcode, LogicBuildSteps); | |||
| 2839 | ||||
| 2840 | // Steps to build hand (logic x, y), ...z | |||
| 2841 | OperandBuildSteps HandBuildSteps = { | |||
| 2842 | [=](MachineInstrBuilder &MIB) { MIB.addDef(Dst); }, | |||
| 2843 | [=](MachineInstrBuilder &MIB) { MIB.addReg(NewLogicDst); }}; | |||
| 2844 | if (ExtraHandOpSrcReg.isValid()) | |||
| 2845 | HandBuildSteps.push_back( | |||
| 2846 | [=](MachineInstrBuilder &MIB) { MIB.addReg(ExtraHandOpSrcReg); }); | |||
| 2847 | InstructionBuildSteps HandSteps(HandOpcode, HandBuildSteps); | |||
| 2848 | ||||
| 2849 | MatchInfo = InstructionStepsMatchInfo({LogicSteps, HandSteps}); | |||
| 2850 | return true; | |||
| 2851 | } | |||
| 2852 | ||||
| 2853 | void CombinerHelper::applyBuildInstructionSteps( | |||
| 2854 | MachineInstr &MI, InstructionStepsMatchInfo &MatchInfo) { | |||
| 2855 | assert(MatchInfo.InstrsToBuild.size() &&(static_cast <bool> (MatchInfo.InstrsToBuild.size() && "Expected at least one instr to build?") ? void (0) : __assert_fail ("MatchInfo.InstrsToBuild.size() && \"Expected at least one instr to build?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2856, __extension__ __PRETTY_FUNCTION__)) | |||
| 2856 | "Expected at least one instr to build?")(static_cast <bool> (MatchInfo.InstrsToBuild.size() && "Expected at least one instr to build?") ? void (0) : __assert_fail ("MatchInfo.InstrsToBuild.size() && \"Expected at least one instr to build?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2856, __extension__ __PRETTY_FUNCTION__)); | |||
| 2857 | Builder.setInstr(MI); | |||
| 2858 | for (auto &InstrToBuild : MatchInfo.InstrsToBuild) { | |||
| 2859 | assert(InstrToBuild.Opcode && "Expected a valid opcode?")(static_cast <bool> (InstrToBuild.Opcode && "Expected a valid opcode?" ) ? void (0) : __assert_fail ("InstrToBuild.Opcode && \"Expected a valid opcode?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2859, __extension__ __PRETTY_FUNCTION__)); | |||
| 2860 | assert(InstrToBuild.OperandFns.size() && "Expected at least one operand?")(static_cast <bool> (InstrToBuild.OperandFns.size() && "Expected at least one operand?") ? void (0) : __assert_fail ("InstrToBuild.OperandFns.size() && \"Expected at least one operand?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2860, __extension__ __PRETTY_FUNCTION__)); | |||
| 2861 | MachineInstrBuilder Instr = Builder.buildInstr(InstrToBuild.Opcode); | |||
| 2862 | for (auto &OperandFn : InstrToBuild.OperandFns) | |||
| 2863 | OperandFn(Instr); | |||
| 2864 | } | |||
| 2865 | MI.eraseFromParent(); | |||
| 2866 | } | |||
| 2867 | ||||
| 2868 | bool CombinerHelper::matchAshrShlToSextInreg( | |||
| 2869 | MachineInstr &MI, std::tuple<Register, int64_t> &MatchInfo) { | |||
| 2870 | assert(MI.getOpcode() == TargetOpcode::G_ASHR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ASHR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ASHR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2870, __extension__ __PRETTY_FUNCTION__)); | |||
| 2871 | int64_t ShlCst, AshrCst; | |||
| 2872 | Register Src; | |||
| 2873 | if (!mi_match(MI.getOperand(0).getReg(), MRI, | |||
| 2874 | m_GAShr(m_GShl(m_Reg(Src), m_ICstOrSplat(ShlCst)), | |||
| 2875 | m_ICstOrSplat(AshrCst)))) | |||
| 2876 | return false; | |||
| 2877 | if (ShlCst != AshrCst) | |||
| 2878 | return false; | |||
| 2879 | if (!isLegalOrBeforeLegalizer( | |||
| 2880 | {TargetOpcode::G_SEXT_INREG, {MRI.getType(Src)}})) | |||
| 2881 | return false; | |||
| 2882 | MatchInfo = std::make_tuple(Src, ShlCst); | |||
| 2883 | return true; | |||
| 2884 | } | |||
| 2885 | ||||
| 2886 | void CombinerHelper::applyAshShlToSextInreg( | |||
| 2887 | MachineInstr &MI, std::tuple<Register, int64_t> &MatchInfo) { | |||
| 2888 | assert(MI.getOpcode() == TargetOpcode::G_ASHR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ASHR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ASHR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2888, __extension__ __PRETTY_FUNCTION__)); | |||
| 2889 | Register Src; | |||
| 2890 | int64_t ShiftAmt; | |||
| 2891 | std::tie(Src, ShiftAmt) = MatchInfo; | |||
| 2892 | unsigned Size = MRI.getType(Src).getScalarSizeInBits(); | |||
| 2893 | Builder.setInstrAndDebugLoc(MI); | |||
| 2894 | Builder.buildSExtInReg(MI.getOperand(0).getReg(), Src, Size - ShiftAmt); | |||
| 2895 | MI.eraseFromParent(); | |||
| 2896 | } | |||
| 2897 | ||||
| 2898 | /// and(and(x, C1), C2) -> C1&C2 ? and(x, C1&C2) : 0 | |||
| 2899 | bool CombinerHelper::matchOverlappingAnd( | |||
| 2900 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 2901 | assert(MI.getOpcode() == TargetOpcode::G_AND)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_AND ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_AND" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2901, __extension__ __PRETTY_FUNCTION__)); | |||
| 2902 | ||||
| 2903 | Register Dst = MI.getOperand(0).getReg(); | |||
| 2904 | LLT Ty = MRI.getType(Dst); | |||
| 2905 | ||||
| 2906 | Register R; | |||
| 2907 | int64_t C1; | |||
| 2908 | int64_t C2; | |||
| 2909 | if (!mi_match( | |||
| 2910 | Dst, MRI, | |||
| 2911 | m_GAnd(m_GAnd(m_Reg(R), m_ICst(C1)), m_ICst(C2)))) | |||
| 2912 | return false; | |||
| 2913 | ||||
| 2914 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 2915 | if (C1 & C2) { | |||
| 2916 | B.buildAnd(Dst, R, B.buildConstant(Ty, C1 & C2)); | |||
| 2917 | return; | |||
| 2918 | } | |||
| 2919 | auto Zero = B.buildConstant(Ty, 0); | |||
| 2920 | replaceRegWith(MRI, Dst, Zero->getOperand(0).getReg()); | |||
| 2921 | }; | |||
| 2922 | return true; | |||
| 2923 | } | |||
| 2924 | ||||
| 2925 | bool CombinerHelper::matchRedundantAnd(MachineInstr &MI, | |||
| 2926 | Register &Replacement) { | |||
| 2927 | // Given | |||
| 2928 | // | |||
| 2929 | // %y:_(sN) = G_SOMETHING | |||
| 2930 | // %x:_(sN) = G_SOMETHING | |||
| 2931 | // %res:_(sN) = G_AND %x, %y | |||
| 2932 | // | |||
| 2933 | // Eliminate the G_AND when it is known that x & y == x or x & y == y. | |||
| 2934 | // | |||
| 2935 | // Patterns like this can appear as a result of legalization. E.g. | |||
| 2936 | // | |||
| 2937 | // %cmp:_(s32) = G_ICMP intpred(pred), %x(s32), %y | |||
| 2938 | // %one:_(s32) = G_CONSTANT i32 1 | |||
| 2939 | // %and:_(s32) = G_AND %cmp, %one | |||
| 2940 | // | |||
| 2941 | // In this case, G_ICMP only produces a single bit, so x & 1 == x. | |||
| 2942 | assert(MI.getOpcode() == TargetOpcode::G_AND)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_AND ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_AND" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2942, __extension__ __PRETTY_FUNCTION__)); | |||
| 2943 | if (!KB) | |||
| 2944 | return false; | |||
| 2945 | ||||
| 2946 | Register AndDst = MI.getOperand(0).getReg(); | |||
| 2947 | Register LHS = MI.getOperand(1).getReg(); | |||
| 2948 | Register RHS = MI.getOperand(2).getReg(); | |||
| 2949 | KnownBits LHSBits = KB->getKnownBits(LHS); | |||
| 2950 | KnownBits RHSBits = KB->getKnownBits(RHS); | |||
| 2951 | ||||
| 2952 | // Check that x & Mask == x. | |||
| 2953 | // x & 1 == x, always | |||
| 2954 | // x & 0 == x, only if x is also 0 | |||
| 2955 | // Meaning Mask has no effect if every bit is either one in Mask or zero in x. | |||
| 2956 | // | |||
| 2957 | // Check if we can replace AndDst with the LHS of the G_AND | |||
| 2958 | if (canReplaceReg(AndDst, LHS, MRI) && | |||
| 2959 | (LHSBits.Zero | RHSBits.One).isAllOnes()) { | |||
| 2960 | Replacement = LHS; | |||
| 2961 | return true; | |||
| 2962 | } | |||
| 2963 | ||||
| 2964 | // Check if we can replace AndDst with the RHS of the G_AND | |||
| 2965 | if (canReplaceReg(AndDst, RHS, MRI) && | |||
| 2966 | (LHSBits.One | RHSBits.Zero).isAllOnes()) { | |||
| 2967 | Replacement = RHS; | |||
| 2968 | return true; | |||
| 2969 | } | |||
| 2970 | ||||
| 2971 | return false; | |||
| 2972 | } | |||
| 2973 | ||||
| 2974 | bool CombinerHelper::matchRedundantOr(MachineInstr &MI, Register &Replacement) { | |||
| 2975 | // Given | |||
| 2976 | // | |||
| 2977 | // %y:_(sN) = G_SOMETHING | |||
| 2978 | // %x:_(sN) = G_SOMETHING | |||
| 2979 | // %res:_(sN) = G_OR %x, %y | |||
| 2980 | // | |||
| 2981 | // Eliminate the G_OR when it is known that x | y == x or x | y == y. | |||
| 2982 | assert(MI.getOpcode() == TargetOpcode::G_OR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_OR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_OR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 2982, __extension__ __PRETTY_FUNCTION__)); | |||
| 2983 | if (!KB) | |||
| 2984 | return false; | |||
| 2985 | ||||
| 2986 | Register OrDst = MI.getOperand(0).getReg(); | |||
| 2987 | Register LHS = MI.getOperand(1).getReg(); | |||
| 2988 | Register RHS = MI.getOperand(2).getReg(); | |||
| 2989 | KnownBits LHSBits = KB->getKnownBits(LHS); | |||
| 2990 | KnownBits RHSBits = KB->getKnownBits(RHS); | |||
| 2991 | ||||
| 2992 | // Check that x | Mask == x. | |||
| 2993 | // x | 0 == x, always | |||
| 2994 | // x | 1 == x, only if x is also 1 | |||
| 2995 | // Meaning Mask has no effect if every bit is either zero in Mask or one in x. | |||
| 2996 | // | |||
| 2997 | // Check if we can replace OrDst with the LHS of the G_OR | |||
| 2998 | if (canReplaceReg(OrDst, LHS, MRI) && | |||
| 2999 | (LHSBits.One | RHSBits.Zero).isAllOnes()) { | |||
| 3000 | Replacement = LHS; | |||
| 3001 | return true; | |||
| 3002 | } | |||
| 3003 | ||||
| 3004 | // Check if we can replace OrDst with the RHS of the G_OR | |||
| 3005 | if (canReplaceReg(OrDst, RHS, MRI) && | |||
| 3006 | (LHSBits.Zero | RHSBits.One).isAllOnes()) { | |||
| 3007 | Replacement = RHS; | |||
| 3008 | return true; | |||
| 3009 | } | |||
| 3010 | ||||
| 3011 | return false; | |||
| 3012 | } | |||
| 3013 | ||||
| 3014 | bool CombinerHelper::matchRedundantSExtInReg(MachineInstr &MI) { | |||
| 3015 | // If the input is already sign extended, just drop the extension. | |||
| 3016 | Register Src = MI.getOperand(1).getReg(); | |||
| 3017 | unsigned ExtBits = MI.getOperand(2).getImm(); | |||
| 3018 | unsigned TypeSize = MRI.getType(Src).getScalarSizeInBits(); | |||
| 3019 | return KB->computeNumSignBits(Src) >= (TypeSize - ExtBits + 1); | |||
| 3020 | } | |||
| 3021 | ||||
| 3022 | static bool isConstValidTrue(const TargetLowering &TLI, unsigned ScalarSizeBits, | |||
| 3023 | int64_t Cst, bool IsVector, bool IsFP) { | |||
| 3024 | // For i1, Cst will always be -1 regardless of boolean contents. | |||
| 3025 | return (ScalarSizeBits == 1 && Cst == -1) || | |||
| 3026 | isConstTrueVal(TLI, Cst, IsVector, IsFP); | |||
| 3027 | } | |||
| 3028 | ||||
| 3029 | bool CombinerHelper::matchNotCmp(MachineInstr &MI, | |||
| 3030 | SmallVectorImpl<Register> &RegsToNegate) { | |||
| 3031 | assert(MI.getOpcode() == TargetOpcode::G_XOR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_XOR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_XOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3031, __extension__ __PRETTY_FUNCTION__)); | |||
| 3032 | LLT Ty = MRI.getType(MI.getOperand(0).getReg()); | |||
| 3033 | const auto &TLI = *Builder.getMF().getSubtarget().getTargetLowering(); | |||
| 3034 | Register XorSrc; | |||
| 3035 | Register CstReg; | |||
| 3036 | // We match xor(src, true) here. | |||
| 3037 | if (!mi_match(MI.getOperand(0).getReg(), MRI, | |||
| 3038 | m_GXor(m_Reg(XorSrc), m_Reg(CstReg)))) | |||
| 3039 | return false; | |||
| 3040 | ||||
| 3041 | if (!MRI.hasOneNonDBGUse(XorSrc)) | |||
| 3042 | return false; | |||
| 3043 | ||||
| 3044 | // Check that XorSrc is the root of a tree of comparisons combined with ANDs | |||
| 3045 | // and ORs. The suffix of RegsToNegate starting from index I is used a work | |||
| 3046 | // list of tree nodes to visit. | |||
| 3047 | RegsToNegate.push_back(XorSrc); | |||
| 3048 | // Remember whether the comparisons are all integer or all floating point. | |||
| 3049 | bool IsInt = false; | |||
| 3050 | bool IsFP = false; | |||
| 3051 | for (unsigned I = 0; I < RegsToNegate.size(); ++I) { | |||
| 3052 | Register Reg = RegsToNegate[I]; | |||
| 3053 | if (!MRI.hasOneNonDBGUse(Reg)) | |||
| 3054 | return false; | |||
| 3055 | MachineInstr *Def = MRI.getVRegDef(Reg); | |||
| 3056 | switch (Def->getOpcode()) { | |||
| 3057 | default: | |||
| 3058 | // Don't match if the tree contains anything other than ANDs, ORs and | |||
| 3059 | // comparisons. | |||
| 3060 | return false; | |||
| 3061 | case TargetOpcode::G_ICMP: | |||
| 3062 | if (IsFP) | |||
| 3063 | return false; | |||
| 3064 | IsInt = true; | |||
| 3065 | // When we apply the combine we will invert the predicate. | |||
| 3066 | break; | |||
| 3067 | case TargetOpcode::G_FCMP: | |||
| 3068 | if (IsInt) | |||
| 3069 | return false; | |||
| 3070 | IsFP = true; | |||
| 3071 | // When we apply the combine we will invert the predicate. | |||
| 3072 | break; | |||
| 3073 | case TargetOpcode::G_AND: | |||
| 3074 | case TargetOpcode::G_OR: | |||
| 3075 | // Implement De Morgan's laws: | |||
| 3076 | // ~(x & y) -> ~x | ~y | |||
| 3077 | // ~(x | y) -> ~x & ~y | |||
| 3078 | // When we apply the combine we will change the opcode and recursively | |||
| 3079 | // negate the operands. | |||
| 3080 | RegsToNegate.push_back(Def->getOperand(1).getReg()); | |||
| 3081 | RegsToNegate.push_back(Def->getOperand(2).getReg()); | |||
| 3082 | break; | |||
| 3083 | } | |||
| 3084 | } | |||
| 3085 | ||||
| 3086 | // Now we know whether the comparisons are integer or floating point, check | |||
| 3087 | // the constant in the xor. | |||
| 3088 | int64_t Cst; | |||
| 3089 | if (Ty.isVector()) { | |||
| 3090 | MachineInstr *CstDef = MRI.getVRegDef(CstReg); | |||
| 3091 | auto MaybeCst = getIConstantSplatSExtVal(*CstDef, MRI); | |||
| 3092 | if (!MaybeCst) | |||
| 3093 | return false; | |||
| 3094 | if (!isConstValidTrue(TLI, Ty.getScalarSizeInBits(), *MaybeCst, true, IsFP)) | |||
| 3095 | return false; | |||
| 3096 | } else { | |||
| 3097 | if (!mi_match(CstReg, MRI, m_ICst(Cst))) | |||
| 3098 | return false; | |||
| 3099 | if (!isConstValidTrue(TLI, Ty.getSizeInBits(), Cst, false, IsFP)) | |||
| 3100 | return false; | |||
| 3101 | } | |||
| 3102 | ||||
| 3103 | return true; | |||
| 3104 | } | |||
| 3105 | ||||
| 3106 | void CombinerHelper::applyNotCmp(MachineInstr &MI, | |||
| 3107 | SmallVectorImpl<Register> &RegsToNegate) { | |||
| 3108 | for (Register Reg : RegsToNegate) { | |||
| 3109 | MachineInstr *Def = MRI.getVRegDef(Reg); | |||
| 3110 | Observer.changingInstr(*Def); | |||
| 3111 | // For each comparison, invert the opcode. For each AND and OR, change the | |||
| 3112 | // opcode. | |||
| 3113 | switch (Def->getOpcode()) { | |||
| 3114 | default: | |||
| 3115 | llvm_unreachable("Unexpected opcode")::llvm::llvm_unreachable_internal("Unexpected opcode", "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp" , 3115); | |||
| 3116 | case TargetOpcode::G_ICMP: | |||
| 3117 | case TargetOpcode::G_FCMP: { | |||
| 3118 | MachineOperand &PredOp = Def->getOperand(1); | |||
| 3119 | CmpInst::Predicate NewP = CmpInst::getInversePredicate( | |||
| 3120 | (CmpInst::Predicate)PredOp.getPredicate()); | |||
| 3121 | PredOp.setPredicate(NewP); | |||
| 3122 | break; | |||
| 3123 | } | |||
| 3124 | case TargetOpcode::G_AND: | |||
| 3125 | Def->setDesc(Builder.getTII().get(TargetOpcode::G_OR)); | |||
| 3126 | break; | |||
| 3127 | case TargetOpcode::G_OR: | |||
| 3128 | Def->setDesc(Builder.getTII().get(TargetOpcode::G_AND)); | |||
| 3129 | break; | |||
| 3130 | } | |||
| 3131 | Observer.changedInstr(*Def); | |||
| 3132 | } | |||
| 3133 | ||||
| 3134 | replaceRegWith(MRI, MI.getOperand(0).getReg(), MI.getOperand(1).getReg()); | |||
| 3135 | MI.eraseFromParent(); | |||
| 3136 | } | |||
| 3137 | ||||
| 3138 | bool CombinerHelper::matchXorOfAndWithSameReg( | |||
| 3139 | MachineInstr &MI, std::pair<Register, Register> &MatchInfo) { | |||
| 3140 | // Match (xor (and x, y), y) (or any of its commuted cases) | |||
| 3141 | assert(MI.getOpcode() == TargetOpcode::G_XOR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_XOR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_XOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3141, __extension__ __PRETTY_FUNCTION__)); | |||
| 3142 | Register &X = MatchInfo.first; | |||
| 3143 | Register &Y = MatchInfo.second; | |||
| 3144 | Register AndReg = MI.getOperand(1).getReg(); | |||
| 3145 | Register SharedReg = MI.getOperand(2).getReg(); | |||
| 3146 | ||||
| 3147 | // Find a G_AND on either side of the G_XOR. | |||
| 3148 | // Look for one of | |||
| 3149 | // | |||
| 3150 | // (xor (and x, y), SharedReg) | |||
| 3151 | // (xor SharedReg, (and x, y)) | |||
| 3152 | if (!mi_match(AndReg, MRI, m_GAnd(m_Reg(X), m_Reg(Y)))) { | |||
| 3153 | std::swap(AndReg, SharedReg); | |||
| 3154 | if (!mi_match(AndReg, MRI, m_GAnd(m_Reg(X), m_Reg(Y)))) | |||
| 3155 | return false; | |||
| 3156 | } | |||
| 3157 | ||||
| 3158 | // Only do this if we'll eliminate the G_AND. | |||
| 3159 | if (!MRI.hasOneNonDBGUse(AndReg)) | |||
| 3160 | return false; | |||
| 3161 | ||||
| 3162 | // We can combine if SharedReg is the same as either the LHS or RHS of the | |||
| 3163 | // G_AND. | |||
| 3164 | if (Y != SharedReg) | |||
| 3165 | std::swap(X, Y); | |||
| 3166 | return Y == SharedReg; | |||
| 3167 | } | |||
| 3168 | ||||
| 3169 | void CombinerHelper::applyXorOfAndWithSameReg( | |||
| 3170 | MachineInstr &MI, std::pair<Register, Register> &MatchInfo) { | |||
| 3171 | // Fold (xor (and x, y), y) -> (and (not x), y) | |||
| 3172 | Builder.setInstrAndDebugLoc(MI); | |||
| 3173 | Register X, Y; | |||
| 3174 | std::tie(X, Y) = MatchInfo; | |||
| 3175 | auto Not = Builder.buildNot(MRI.getType(X), X); | |||
| 3176 | Observer.changingInstr(MI); | |||
| 3177 | MI.setDesc(Builder.getTII().get(TargetOpcode::G_AND)); | |||
| 3178 | MI.getOperand(1).setReg(Not->getOperand(0).getReg()); | |||
| 3179 | MI.getOperand(2).setReg(Y); | |||
| 3180 | Observer.changedInstr(MI); | |||
| 3181 | } | |||
| 3182 | ||||
| 3183 | bool CombinerHelper::matchPtrAddZero(MachineInstr &MI) { | |||
| 3184 | auto &PtrAdd = cast<GPtrAdd>(MI); | |||
| 3185 | Register DstReg = PtrAdd.getReg(0); | |||
| 3186 | LLT Ty = MRI.getType(DstReg); | |||
| 3187 | const DataLayout &DL = Builder.getMF().getDataLayout(); | |||
| 3188 | ||||
| 3189 | if (DL.isNonIntegralAddressSpace(Ty.getScalarType().getAddressSpace())) | |||
| 3190 | return false; | |||
| 3191 | ||||
| 3192 | if (Ty.isPointer()) { | |||
| 3193 | auto ConstVal = getIConstantVRegVal(PtrAdd.getBaseReg(), MRI); | |||
| 3194 | return ConstVal && *ConstVal == 0; | |||
| 3195 | } | |||
| 3196 | ||||
| 3197 | assert(Ty.isVector() && "Expecting a vector type")(static_cast <bool> (Ty.isVector() && "Expecting a vector type" ) ? void (0) : __assert_fail ("Ty.isVector() && \"Expecting a vector type\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3197, __extension__ __PRETTY_FUNCTION__)); | |||
| 3198 | const MachineInstr *VecMI = MRI.getVRegDef(PtrAdd.getBaseReg()); | |||
| 3199 | return isBuildVectorAllZeros(*VecMI, MRI); | |||
| 3200 | } | |||
| 3201 | ||||
| 3202 | void CombinerHelper::applyPtrAddZero(MachineInstr &MI) { | |||
| 3203 | auto &PtrAdd = cast<GPtrAdd>(MI); | |||
| 3204 | Builder.setInstrAndDebugLoc(PtrAdd); | |||
| 3205 | Builder.buildIntToPtr(PtrAdd.getReg(0), PtrAdd.getOffsetReg()); | |||
| 3206 | PtrAdd.eraseFromParent(); | |||
| 3207 | } | |||
| 3208 | ||||
| 3209 | /// The second source operand is known to be a power of 2. | |||
| 3210 | void CombinerHelper::applySimplifyURemByPow2(MachineInstr &MI) { | |||
| 3211 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 3212 | Register Src0 = MI.getOperand(1).getReg(); | |||
| 3213 | Register Pow2Src1 = MI.getOperand(2).getReg(); | |||
| 3214 | LLT Ty = MRI.getType(DstReg); | |||
| 3215 | Builder.setInstrAndDebugLoc(MI); | |||
| 3216 | ||||
| 3217 | // Fold (urem x, pow2) -> (and x, pow2-1) | |||
| 3218 | auto NegOne = Builder.buildConstant(Ty, -1); | |||
| 3219 | auto Add = Builder.buildAdd(Ty, Pow2Src1, NegOne); | |||
| 3220 | Builder.buildAnd(DstReg, Src0, Add); | |||
| 3221 | MI.eraseFromParent(); | |||
| 3222 | } | |||
| 3223 | ||||
| 3224 | bool CombinerHelper::matchFoldBinOpIntoSelect(MachineInstr &MI, | |||
| 3225 | unsigned &SelectOpNo) { | |||
| 3226 | Register LHS = MI.getOperand(1).getReg(); | |||
| 3227 | Register RHS = MI.getOperand(2).getReg(); | |||
| 3228 | ||||
| 3229 | Register OtherOperandReg = RHS; | |||
| 3230 | SelectOpNo = 1; | |||
| 3231 | MachineInstr *Select = MRI.getVRegDef(LHS); | |||
| 3232 | ||||
| 3233 | // Don't do this unless the old select is going away. We want to eliminate the | |||
| 3234 | // binary operator, not replace a binop with a select. | |||
| 3235 | if (Select->getOpcode() != TargetOpcode::G_SELECT || | |||
| 3236 | !MRI.hasOneNonDBGUse(LHS)) { | |||
| 3237 | OtherOperandReg = LHS; | |||
| 3238 | SelectOpNo = 2; | |||
| 3239 | Select = MRI.getVRegDef(RHS); | |||
| 3240 | if (Select->getOpcode() != TargetOpcode::G_SELECT || | |||
| 3241 | !MRI.hasOneNonDBGUse(RHS)) | |||
| 3242 | return false; | |||
| 3243 | } | |||
| 3244 | ||||
| 3245 | MachineInstr *SelectLHS = MRI.getVRegDef(Select->getOperand(2).getReg()); | |||
| 3246 | MachineInstr *SelectRHS = MRI.getVRegDef(Select->getOperand(3).getReg()); | |||
| 3247 | ||||
| 3248 | if (!isConstantOrConstantVector(*SelectLHS, MRI, | |||
| 3249 | /*AllowFP*/ true, | |||
| 3250 | /*AllowOpaqueConstants*/ false)) | |||
| 3251 | return false; | |||
| 3252 | if (!isConstantOrConstantVector(*SelectRHS, MRI, | |||
| 3253 | /*AllowFP*/ true, | |||
| 3254 | /*AllowOpaqueConstants*/ false)) | |||
| 3255 | return false; | |||
| 3256 | ||||
| 3257 | unsigned BinOpcode = MI.getOpcode(); | |||
| 3258 | ||||
| 3259 | // We know know one of the operands is a select of constants. Now verify that | |||
| 3260 | // the other binary operator operand is either a constant, or we can handle a | |||
| 3261 | // variable. | |||
| 3262 | bool CanFoldNonConst = | |||
| 3263 | (BinOpcode == TargetOpcode::G_AND || BinOpcode == TargetOpcode::G_OR) && | |||
| 3264 | (isNullOrNullSplat(*SelectLHS, MRI) || | |||
| 3265 | isAllOnesOrAllOnesSplat(*SelectLHS, MRI)) && | |||
| 3266 | (isNullOrNullSplat(*SelectRHS, MRI) || | |||
| 3267 | isAllOnesOrAllOnesSplat(*SelectRHS, MRI)); | |||
| 3268 | if (CanFoldNonConst) | |||
| 3269 | return true; | |||
| 3270 | ||||
| 3271 | return isConstantOrConstantVector(*MRI.getVRegDef(OtherOperandReg), MRI, | |||
| 3272 | /*AllowFP*/ true, | |||
| 3273 | /*AllowOpaqueConstants*/ false); | |||
| 3274 | } | |||
| 3275 | ||||
| 3276 | /// \p SelectOperand is the operand in binary operator \p MI that is the select | |||
| 3277 | /// to fold. | |||
| 3278 | bool CombinerHelper::applyFoldBinOpIntoSelect(MachineInstr &MI, | |||
| 3279 | const unsigned &SelectOperand) { | |||
| 3280 | Builder.setInstrAndDebugLoc(MI); | |||
| 3281 | ||||
| 3282 | Register Dst = MI.getOperand(0).getReg(); | |||
| 3283 | Register LHS = MI.getOperand(1).getReg(); | |||
| 3284 | Register RHS = MI.getOperand(2).getReg(); | |||
| 3285 | MachineInstr *Select = MRI.getVRegDef(MI.getOperand(SelectOperand).getReg()); | |||
| 3286 | ||||
| 3287 | Register SelectCond = Select->getOperand(1).getReg(); | |||
| 3288 | Register SelectTrue = Select->getOperand(2).getReg(); | |||
| 3289 | Register SelectFalse = Select->getOperand(3).getReg(); | |||
| 3290 | ||||
| 3291 | LLT Ty = MRI.getType(Dst); | |||
| 3292 | unsigned BinOpcode = MI.getOpcode(); | |||
| 3293 | ||||
| 3294 | Register FoldTrue, FoldFalse; | |||
| 3295 | ||||
| 3296 | // We have a select-of-constants followed by a binary operator with a | |||
| 3297 | // constant. Eliminate the binop by pulling the constant math into the select. | |||
| 3298 | // Example: add (select Cond, CT, CF), CBO --> select Cond, CT + CBO, CF + CBO | |||
| 3299 | if (SelectOperand == 1) { | |||
| 3300 | // TODO: SelectionDAG verifies this actually constant folds before | |||
| 3301 | // committing to the combine. | |||
| 3302 | ||||
| 3303 | FoldTrue = Builder.buildInstr(BinOpcode, {Ty}, {SelectTrue, RHS}).getReg(0); | |||
| 3304 | FoldFalse = | |||
| 3305 | Builder.buildInstr(BinOpcode, {Ty}, {SelectFalse, RHS}).getReg(0); | |||
| 3306 | } else { | |||
| 3307 | FoldTrue = Builder.buildInstr(BinOpcode, {Ty}, {LHS, SelectTrue}).getReg(0); | |||
| 3308 | FoldFalse = | |||
| 3309 | Builder.buildInstr(BinOpcode, {Ty}, {LHS, SelectFalse}).getReg(0); | |||
| 3310 | } | |||
| 3311 | ||||
| 3312 | Builder.buildSelect(Dst, SelectCond, FoldTrue, FoldFalse, MI.getFlags()); | |||
| 3313 | MI.eraseFromParent(); | |||
| 3314 | ||||
| 3315 | return true; | |||
| 3316 | } | |||
| 3317 | ||||
| 3318 | std::optional<SmallVector<Register, 8>> | |||
| 3319 | CombinerHelper::findCandidatesForLoadOrCombine(const MachineInstr *Root) const { | |||
| 3320 | assert(Root->getOpcode() == TargetOpcode::G_OR && "Expected G_OR only!")(static_cast <bool> (Root->getOpcode() == TargetOpcode ::G_OR && "Expected G_OR only!") ? void (0) : __assert_fail ("Root->getOpcode() == TargetOpcode::G_OR && \"Expected G_OR only!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3320, __extension__ __PRETTY_FUNCTION__)); | |||
| 3321 | // We want to detect if Root is part of a tree which represents a bunch | |||
| 3322 | // of loads being merged into a larger load. We'll try to recognize patterns | |||
| 3323 | // like, for example: | |||
| 3324 | // | |||
| 3325 | // Reg Reg | |||
| 3326 | // \ / | |||
| 3327 | // OR_1 Reg | |||
| 3328 | // \ / | |||
| 3329 | // OR_2 | |||
| 3330 | // \ Reg | |||
| 3331 | // .. / | |||
| 3332 | // Root | |||
| 3333 | // | |||
| 3334 | // Reg Reg Reg Reg | |||
| 3335 | // \ / \ / | |||
| 3336 | // OR_1 OR_2 | |||
| 3337 | // \ / | |||
| 3338 | // \ / | |||
| 3339 | // ... | |||
| 3340 | // Root | |||
| 3341 | // | |||
| 3342 | // Each "Reg" may have been produced by a load + some arithmetic. This | |||
| 3343 | // function will save each of them. | |||
| 3344 | SmallVector<Register, 8> RegsToVisit; | |||
| 3345 | SmallVector<const MachineInstr *, 7> Ors = {Root}; | |||
| 3346 | ||||
| 3347 | // In the "worst" case, we're dealing with a load for each byte. So, there | |||
| 3348 | // are at most #bytes - 1 ORs. | |||
| 3349 | const unsigned MaxIter = | |||
| 3350 | MRI.getType(Root->getOperand(0).getReg()).getSizeInBytes() - 1; | |||
| 3351 | for (unsigned Iter = 0; Iter < MaxIter; ++Iter) { | |||
| 3352 | if (Ors.empty()) | |||
| 3353 | break; | |||
| 3354 | const MachineInstr *Curr = Ors.pop_back_val(); | |||
| 3355 | Register OrLHS = Curr->getOperand(1).getReg(); | |||
| 3356 | Register OrRHS = Curr->getOperand(2).getReg(); | |||
| 3357 | ||||
| 3358 | // In the combine, we want to elimate the entire tree. | |||
| 3359 | if (!MRI.hasOneNonDBGUse(OrLHS) || !MRI.hasOneNonDBGUse(OrRHS)) | |||
| 3360 | return std::nullopt; | |||
| 3361 | ||||
| 3362 | // If it's a G_OR, save it and continue to walk. If it's not, then it's | |||
| 3363 | // something that may be a load + arithmetic. | |||
| 3364 | if (const MachineInstr *Or = getOpcodeDef(TargetOpcode::G_OR, OrLHS, MRI)) | |||
| 3365 | Ors.push_back(Or); | |||
| 3366 | else | |||
| 3367 | RegsToVisit.push_back(OrLHS); | |||
| 3368 | if (const MachineInstr *Or = getOpcodeDef(TargetOpcode::G_OR, OrRHS, MRI)) | |||
| 3369 | Ors.push_back(Or); | |||
| 3370 | else | |||
| 3371 | RegsToVisit.push_back(OrRHS); | |||
| 3372 | } | |||
| 3373 | ||||
| 3374 | // We're going to try and merge each register into a wider power-of-2 type, | |||
| 3375 | // so we ought to have an even number of registers. | |||
| 3376 | if (RegsToVisit.empty() || RegsToVisit.size() % 2 != 0) | |||
| 3377 | return std::nullopt; | |||
| 3378 | return RegsToVisit; | |||
| 3379 | } | |||
| 3380 | ||||
| 3381 | /// Helper function for findLoadOffsetsForLoadOrCombine. | |||
| 3382 | /// | |||
| 3383 | /// Check if \p Reg is the result of loading a \p MemSizeInBits wide value, | |||
| 3384 | /// and then moving that value into a specific byte offset. | |||
| 3385 | /// | |||
| 3386 | /// e.g. x[i] << 24 | |||
| 3387 | /// | |||
| 3388 | /// \returns The load instruction and the byte offset it is moved into. | |||
| 3389 | static std::optional<std::pair<GZExtLoad *, int64_t>> | |||
| 3390 | matchLoadAndBytePosition(Register Reg, unsigned MemSizeInBits, | |||
| 3391 | const MachineRegisterInfo &MRI) { | |||
| 3392 | assert(MRI.hasOneNonDBGUse(Reg) &&(static_cast <bool> (MRI.hasOneNonDBGUse(Reg) && "Expected Reg to only have one non-debug use?") ? void (0) : __assert_fail ("MRI.hasOneNonDBGUse(Reg) && \"Expected Reg to only have one non-debug use?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3393, __extension__ __PRETTY_FUNCTION__)) | |||
| 3393 | "Expected Reg to only have one non-debug use?")(static_cast <bool> (MRI.hasOneNonDBGUse(Reg) && "Expected Reg to only have one non-debug use?") ? void (0) : __assert_fail ("MRI.hasOneNonDBGUse(Reg) && \"Expected Reg to only have one non-debug use?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3393, __extension__ __PRETTY_FUNCTION__)); | |||
| 3394 | Register MaybeLoad; | |||
| 3395 | int64_t Shift; | |||
| 3396 | if (!mi_match(Reg, MRI, | |||
| 3397 | m_OneNonDBGUse(m_GShl(m_Reg(MaybeLoad), m_ICst(Shift))))) { | |||
| 3398 | Shift = 0; | |||
| 3399 | MaybeLoad = Reg; | |||
| 3400 | } | |||
| 3401 | ||||
| 3402 | if (Shift % MemSizeInBits != 0) | |||
| 3403 | return std::nullopt; | |||
| 3404 | ||||
| 3405 | // TODO: Handle other types of loads. | |||
| 3406 | auto *Load = getOpcodeDef<GZExtLoad>(MaybeLoad, MRI); | |||
| 3407 | if (!Load) | |||
| 3408 | return std::nullopt; | |||
| 3409 | ||||
| 3410 | if (!Load->isUnordered() || Load->getMemSizeInBits() != MemSizeInBits) | |||
| 3411 | return std::nullopt; | |||
| 3412 | ||||
| 3413 | return std::make_pair(Load, Shift / MemSizeInBits); | |||
| 3414 | } | |||
| 3415 | ||||
| 3416 | std::optional<std::tuple<GZExtLoad *, int64_t, GZExtLoad *>> | |||
| 3417 | CombinerHelper::findLoadOffsetsForLoadOrCombine( | |||
| 3418 | SmallDenseMap<int64_t, int64_t, 8> &MemOffset2Idx, | |||
| 3419 | const SmallVector<Register, 8> &RegsToVisit, const unsigned MemSizeInBits) { | |||
| 3420 | ||||
| 3421 | // Each load found for the pattern. There should be one for each RegsToVisit. | |||
| 3422 | SmallSetVector<const MachineInstr *, 8> Loads; | |||
| 3423 | ||||
| 3424 | // The lowest index used in any load. (The lowest "i" for each x[i].) | |||
| 3425 | int64_t LowestIdx = INT64_MAX(9223372036854775807L); | |||
| 3426 | ||||
| 3427 | // The load which uses the lowest index. | |||
| 3428 | GZExtLoad *LowestIdxLoad = nullptr; | |||
| 3429 | ||||
| 3430 | // Keeps track of the load indices we see. We shouldn't see any indices twice. | |||
| 3431 | SmallSet<int64_t, 8> SeenIdx; | |||
| 3432 | ||||
| 3433 | // Ensure each load is in the same MBB. | |||
| 3434 | // TODO: Support multiple MachineBasicBlocks. | |||
| 3435 | MachineBasicBlock *MBB = nullptr; | |||
| 3436 | const MachineMemOperand *MMO = nullptr; | |||
| 3437 | ||||
| 3438 | // Earliest instruction-order load in the pattern. | |||
| 3439 | GZExtLoad *EarliestLoad = nullptr; | |||
| 3440 | ||||
| 3441 | // Latest instruction-order load in the pattern. | |||
| 3442 | GZExtLoad *LatestLoad = nullptr; | |||
| 3443 | ||||
| 3444 | // Base pointer which every load should share. | |||
| 3445 | Register BasePtr; | |||
| 3446 | ||||
| 3447 | // We want to find a load for each register. Each load should have some | |||
| 3448 | // appropriate bit twiddling arithmetic. During this loop, we will also keep | |||
| 3449 | // track of the load which uses the lowest index. Later, we will check if we | |||
| 3450 | // can use its pointer in the final, combined load. | |||
| 3451 | for (auto Reg : RegsToVisit) { | |||
| 3452 | // Find the load, and find the position that it will end up in (e.g. a | |||
| 3453 | // shifted) value. | |||
| 3454 | auto LoadAndPos = matchLoadAndBytePosition(Reg, MemSizeInBits, MRI); | |||
| 3455 | if (!LoadAndPos) | |||
| 3456 | return std::nullopt; | |||
| 3457 | GZExtLoad *Load; | |||
| 3458 | int64_t DstPos; | |||
| 3459 | std::tie(Load, DstPos) = *LoadAndPos; | |||
| 3460 | ||||
| 3461 | // TODO: Handle multiple MachineBasicBlocks. Currently not handled because | |||
| 3462 | // it is difficult to check for stores/calls/etc between loads. | |||
| 3463 | MachineBasicBlock *LoadMBB = Load->getParent(); | |||
| 3464 | if (!MBB) | |||
| 3465 | MBB = LoadMBB; | |||
| 3466 | if (LoadMBB != MBB) | |||
| 3467 | return std::nullopt; | |||
| 3468 | ||||
| 3469 | // Make sure that the MachineMemOperands of every seen load are compatible. | |||
| 3470 | auto &LoadMMO = Load->getMMO(); | |||
| 3471 | if (!MMO) | |||
| 3472 | MMO = &LoadMMO; | |||
| 3473 | if (MMO->getAddrSpace() != LoadMMO.getAddrSpace()) | |||
| 3474 | return std::nullopt; | |||
| 3475 | ||||
| 3476 | // Find out what the base pointer and index for the load is. | |||
| 3477 | Register LoadPtr; | |||
| 3478 | int64_t Idx; | |||
| 3479 | if (!mi_match(Load->getOperand(1).getReg(), MRI, | |||
| 3480 | m_GPtrAdd(m_Reg(LoadPtr), m_ICst(Idx)))) { | |||
| 3481 | LoadPtr = Load->getOperand(1).getReg(); | |||
| 3482 | Idx = 0; | |||
| 3483 | } | |||
| 3484 | ||||
| 3485 | // Don't combine things like a[i], a[i] -> a bigger load. | |||
| 3486 | if (!SeenIdx.insert(Idx).second) | |||
| 3487 | return std::nullopt; | |||
| 3488 | ||||
| 3489 | // Every load must share the same base pointer; don't combine things like: | |||
| 3490 | // | |||
| 3491 | // a[i], b[i + 1] -> a bigger load. | |||
| 3492 | if (!BasePtr.isValid()) | |||
| 3493 | BasePtr = LoadPtr; | |||
| 3494 | if (BasePtr != LoadPtr) | |||
| 3495 | return std::nullopt; | |||
| 3496 | ||||
| 3497 | if (Idx < LowestIdx) { | |||
| 3498 | LowestIdx = Idx; | |||
| 3499 | LowestIdxLoad = Load; | |||
| 3500 | } | |||
| 3501 | ||||
| 3502 | // Keep track of the byte offset that this load ends up at. If we have seen | |||
| 3503 | // the byte offset, then stop here. We do not want to combine: | |||
| 3504 | // | |||
| 3505 | // a[i] << 16, a[i + k] << 16 -> a bigger load. | |||
| 3506 | if (!MemOffset2Idx.try_emplace(DstPos, Idx).second) | |||
| 3507 | return std::nullopt; | |||
| 3508 | Loads.insert(Load); | |||
| 3509 | ||||
| 3510 | // Keep track of the position of the earliest/latest loads in the pattern. | |||
| 3511 | // We will check that there are no load fold barriers between them later | |||
| 3512 | // on. | |||
| 3513 | // | |||
| 3514 | // FIXME: Is there a better way to check for load fold barriers? | |||
| 3515 | if (!EarliestLoad || dominates(*Load, *EarliestLoad)) | |||
| 3516 | EarliestLoad = Load; | |||
| 3517 | if (!LatestLoad || dominates(*LatestLoad, *Load)) | |||
| 3518 | LatestLoad = Load; | |||
| 3519 | } | |||
| 3520 | ||||
| 3521 | // We found a load for each register. Let's check if each load satisfies the | |||
| 3522 | // pattern. | |||
| 3523 | assert(Loads.size() == RegsToVisit.size() &&(static_cast <bool> (Loads.size() == RegsToVisit.size() && "Expected to find a load for each register?") ? void (0) : __assert_fail ("Loads.size() == RegsToVisit.size() && \"Expected to find a load for each register?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3524, __extension__ __PRETTY_FUNCTION__)) | |||
| 3524 | "Expected to find a load for each register?")(static_cast <bool> (Loads.size() == RegsToVisit.size() && "Expected to find a load for each register?") ? void (0) : __assert_fail ("Loads.size() == RegsToVisit.size() && \"Expected to find a load for each register?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3524, __extension__ __PRETTY_FUNCTION__)); | |||
| 3525 | assert(EarliestLoad != LatestLoad && EarliestLoad &&(static_cast <bool> (EarliestLoad != LatestLoad && EarliestLoad && LatestLoad && "Expected at least two loads?" ) ? void (0) : __assert_fail ("EarliestLoad != LatestLoad && EarliestLoad && LatestLoad && \"Expected at least two loads?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3526, __extension__ __PRETTY_FUNCTION__)) | |||
| 3526 | LatestLoad && "Expected at least two loads?")(static_cast <bool> (EarliestLoad != LatestLoad && EarliestLoad && LatestLoad && "Expected at least two loads?" ) ? void (0) : __assert_fail ("EarliestLoad != LatestLoad && EarliestLoad && LatestLoad && \"Expected at least two loads?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3526, __extension__ __PRETTY_FUNCTION__)); | |||
| 3527 | ||||
| 3528 | // Check if there are any stores, calls, etc. between any of the loads. If | |||
| 3529 | // there are, then we can't safely perform the combine. | |||
| 3530 | // | |||
| 3531 | // MaxIter is chosen based off the (worst case) number of iterations it | |||
| 3532 | // typically takes to succeed in the LLVM test suite plus some padding. | |||
| 3533 | // | |||
| 3534 | // FIXME: Is there a better way to check for load fold barriers? | |||
| 3535 | const unsigned MaxIter = 20; | |||
| 3536 | unsigned Iter = 0; | |||
| 3537 | for (const auto &MI : instructionsWithoutDebug(EarliestLoad->getIterator(), | |||
| 3538 | LatestLoad->getIterator())) { | |||
| 3539 | if (Loads.count(&MI)) | |||
| 3540 | continue; | |||
| 3541 | if (MI.isLoadFoldBarrier()) | |||
| 3542 | return std::nullopt; | |||
| 3543 | if (Iter++ == MaxIter) | |||
| 3544 | return std::nullopt; | |||
| 3545 | } | |||
| 3546 | ||||
| 3547 | return std::make_tuple(LowestIdxLoad, LowestIdx, LatestLoad); | |||
| 3548 | } | |||
| 3549 | ||||
| 3550 | bool CombinerHelper::matchLoadOrCombine( | |||
| 3551 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 3552 | assert(MI.getOpcode() == TargetOpcode::G_OR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_OR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_OR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3552, __extension__ __PRETTY_FUNCTION__)); | |||
| 3553 | MachineFunction &MF = *MI.getMF(); | |||
| 3554 | // Assuming a little-endian target, transform: | |||
| 3555 | // s8 *a = ... | |||
| 3556 | // s32 val = a[0] | (a[1] << 8) | (a[2] << 16) | (a[3] << 24) | |||
| 3557 | // => | |||
| 3558 | // s32 val = *((i32)a) | |||
| 3559 | // | |||
| 3560 | // s8 *a = ... | |||
| 3561 | // s32 val = (a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3] | |||
| 3562 | // => | |||
| 3563 | // s32 val = BSWAP(*((s32)a)) | |||
| 3564 | Register Dst = MI.getOperand(0).getReg(); | |||
| 3565 | LLT Ty = MRI.getType(Dst); | |||
| 3566 | if (Ty.isVector()) | |||
| 3567 | return false; | |||
| 3568 | ||||
| 3569 | // We need to combine at least two loads into this type. Since the smallest | |||
| 3570 | // possible load is into a byte, we need at least a 16-bit wide type. | |||
| 3571 | const unsigned WideMemSizeInBits = Ty.getSizeInBits(); | |||
| 3572 | if (WideMemSizeInBits < 16 || WideMemSizeInBits % 8 != 0) | |||
| 3573 | return false; | |||
| 3574 | ||||
| 3575 | // Match a collection of non-OR instructions in the pattern. | |||
| 3576 | auto RegsToVisit = findCandidatesForLoadOrCombine(&MI); | |||
| 3577 | if (!RegsToVisit) | |||
| 3578 | return false; | |||
| 3579 | ||||
| 3580 | // We have a collection of non-OR instructions. Figure out how wide each of | |||
| 3581 | // the small loads should be based off of the number of potential loads we | |||
| 3582 | // found. | |||
| 3583 | const unsigned NarrowMemSizeInBits = WideMemSizeInBits / RegsToVisit->size(); | |||
| 3584 | if (NarrowMemSizeInBits % 8 != 0) | |||
| 3585 | return false; | |||
| 3586 | ||||
| 3587 | // Check if each register feeding into each OR is a load from the same | |||
| 3588 | // base pointer + some arithmetic. | |||
| 3589 | // | |||
| 3590 | // e.g. a[0], a[1] << 8, a[2] << 16, etc. | |||
| 3591 | // | |||
| 3592 | // Also verify that each of these ends up putting a[i] into the same memory | |||
| 3593 | // offset as a load into a wide type would. | |||
| 3594 | SmallDenseMap<int64_t, int64_t, 8> MemOffset2Idx; | |||
| 3595 | GZExtLoad *LowestIdxLoad, *LatestLoad; | |||
| 3596 | int64_t LowestIdx; | |||
| 3597 | auto MaybeLoadInfo = findLoadOffsetsForLoadOrCombine( | |||
| 3598 | MemOffset2Idx, *RegsToVisit, NarrowMemSizeInBits); | |||
| 3599 | if (!MaybeLoadInfo) | |||
| 3600 | return false; | |||
| 3601 | std::tie(LowestIdxLoad, LowestIdx, LatestLoad) = *MaybeLoadInfo; | |||
| 3602 | ||||
| 3603 | // We have a bunch of loads being OR'd together. Using the addresses + offsets | |||
| 3604 | // we found before, check if this corresponds to a big or little endian byte | |||
| 3605 | // pattern. If it does, then we can represent it using a load + possibly a | |||
| 3606 | // BSWAP. | |||
| 3607 | bool IsBigEndianTarget = MF.getDataLayout().isBigEndian(); | |||
| 3608 | std::optional<bool> IsBigEndian = isBigEndian(MemOffset2Idx, LowestIdx); | |||
| 3609 | if (!IsBigEndian) | |||
| 3610 | return false; | |||
| 3611 | bool NeedsBSwap = IsBigEndianTarget != *IsBigEndian; | |||
| 3612 | if (NeedsBSwap && !isLegalOrBeforeLegalizer({TargetOpcode::G_BSWAP, {Ty}})) | |||
| 3613 | return false; | |||
| 3614 | ||||
| 3615 | // Make sure that the load from the lowest index produces offset 0 in the | |||
| 3616 | // final value. | |||
| 3617 | // | |||
| 3618 | // This ensures that we won't combine something like this: | |||
| 3619 | // | |||
| 3620 | // load x[i] -> byte 2 | |||
| 3621 | // load x[i+1] -> byte 0 ---> wide_load x[i] | |||
| 3622 | // load x[i+2] -> byte 1 | |||
| 3623 | const unsigned NumLoadsInTy = WideMemSizeInBits / NarrowMemSizeInBits; | |||
| 3624 | const unsigned ZeroByteOffset = | |||
| 3625 | *IsBigEndian | |||
| 3626 | ? bigEndianByteAt(NumLoadsInTy, 0) | |||
| 3627 | : littleEndianByteAt(NumLoadsInTy, 0); | |||
| 3628 | auto ZeroOffsetIdx = MemOffset2Idx.find(ZeroByteOffset); | |||
| 3629 | if (ZeroOffsetIdx == MemOffset2Idx.end() || | |||
| 3630 | ZeroOffsetIdx->second != LowestIdx) | |||
| 3631 | return false; | |||
| 3632 | ||||
| 3633 | // We wil reuse the pointer from the load which ends up at byte offset 0. It | |||
| 3634 | // may not use index 0. | |||
| 3635 | Register Ptr = LowestIdxLoad->getPointerReg(); | |||
| 3636 | const MachineMemOperand &MMO = LowestIdxLoad->getMMO(); | |||
| 3637 | LegalityQuery::MemDesc MMDesc(MMO); | |||
| 3638 | MMDesc.MemoryTy = Ty; | |||
| 3639 | if (!isLegalOrBeforeLegalizer( | |||
| 3640 | {TargetOpcode::G_LOAD, {Ty, MRI.getType(Ptr)}, {MMDesc}})) | |||
| 3641 | return false; | |||
| 3642 | auto PtrInfo = MMO.getPointerInfo(); | |||
| 3643 | auto *NewMMO = MF.getMachineMemOperand(&MMO, PtrInfo, WideMemSizeInBits / 8); | |||
| 3644 | ||||
| 3645 | // Load must be allowed and fast on the target. | |||
| 3646 | LLVMContext &C = MF.getFunction().getContext(); | |||
| 3647 | auto &DL = MF.getDataLayout(); | |||
| 3648 | unsigned Fast = 0; | |||
| 3649 | if (!getTargetLowering().allowsMemoryAccess(C, DL, Ty, *NewMMO, &Fast) || | |||
| 3650 | !Fast) | |||
| 3651 | return false; | |||
| 3652 | ||||
| 3653 | MatchInfo = [=](MachineIRBuilder &MIB) { | |||
| 3654 | MIB.setInstrAndDebugLoc(*LatestLoad); | |||
| 3655 | Register LoadDst = NeedsBSwap ? MRI.cloneVirtualRegister(Dst) : Dst; | |||
| 3656 | MIB.buildLoad(LoadDst, Ptr, *NewMMO); | |||
| 3657 | if (NeedsBSwap) | |||
| 3658 | MIB.buildBSwap(Dst, LoadDst); | |||
| 3659 | }; | |||
| 3660 | return true; | |||
| 3661 | } | |||
| 3662 | ||||
| 3663 | bool CombinerHelper::matchExtendThroughPhis(MachineInstr &MI, | |||
| 3664 | MachineInstr *&ExtMI) { | |||
| 3665 | assert(MI.getOpcode() == TargetOpcode::G_PHI)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_PHI ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_PHI" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3665, __extension__ __PRETTY_FUNCTION__)); | |||
| 3666 | ||||
| 3667 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 3668 | ||||
| 3669 | // TODO: Extending a vector may be expensive, don't do this until heuristics | |||
| 3670 | // are better. | |||
| 3671 | if (MRI.getType(DstReg).isVector()) | |||
| 3672 | return false; | |||
| 3673 | ||||
| 3674 | // Try to match a phi, whose only use is an extend. | |||
| 3675 | if (!MRI.hasOneNonDBGUse(DstReg)) | |||
| 3676 | return false; | |||
| 3677 | ExtMI = &*MRI.use_instr_nodbg_begin(DstReg); | |||
| 3678 | switch (ExtMI->getOpcode()) { | |||
| 3679 | case TargetOpcode::G_ANYEXT: | |||
| 3680 | return true; // G_ANYEXT is usually free. | |||
| 3681 | case TargetOpcode::G_ZEXT: | |||
| 3682 | case TargetOpcode::G_SEXT: | |||
| 3683 | break; | |||
| 3684 | default: | |||
| 3685 | return false; | |||
| 3686 | } | |||
| 3687 | ||||
| 3688 | // If the target is likely to fold this extend away, don't propagate. | |||
| 3689 | if (Builder.getTII().isExtendLikelyToBeFolded(*ExtMI, MRI)) | |||
| 3690 | return false; | |||
| 3691 | ||||
| 3692 | // We don't want to propagate the extends unless there's a good chance that | |||
| 3693 | // they'll be optimized in some way. | |||
| 3694 | // Collect the unique incoming values. | |||
| 3695 | SmallPtrSet<MachineInstr *, 4> InSrcs; | |||
| 3696 | for (unsigned Idx = 1; Idx < MI.getNumOperands(); Idx += 2) { | |||
| 3697 | auto *DefMI = getDefIgnoringCopies(MI.getOperand(Idx).getReg(), MRI); | |||
| 3698 | switch (DefMI->getOpcode()) { | |||
| 3699 | case TargetOpcode::G_LOAD: | |||
| 3700 | case TargetOpcode::G_TRUNC: | |||
| 3701 | case TargetOpcode::G_SEXT: | |||
| 3702 | case TargetOpcode::G_ZEXT: | |||
| 3703 | case TargetOpcode::G_ANYEXT: | |||
| 3704 | case TargetOpcode::G_CONSTANT: | |||
| 3705 | InSrcs.insert(getDefIgnoringCopies(MI.getOperand(Idx).getReg(), MRI)); | |||
| 3706 | // Don't try to propagate if there are too many places to create new | |||
| 3707 | // extends, chances are it'll increase code size. | |||
| 3708 | if (InSrcs.size() > 2) | |||
| 3709 | return false; | |||
| 3710 | break; | |||
| 3711 | default: | |||
| 3712 | return false; | |||
| 3713 | } | |||
| 3714 | } | |||
| 3715 | return true; | |||
| 3716 | } | |||
| 3717 | ||||
| 3718 | void CombinerHelper::applyExtendThroughPhis(MachineInstr &MI, | |||
| 3719 | MachineInstr *&ExtMI) { | |||
| 3720 | assert(MI.getOpcode() == TargetOpcode::G_PHI)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_PHI ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_PHI" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3720, __extension__ __PRETTY_FUNCTION__)); | |||
| 3721 | Register DstReg = ExtMI->getOperand(0).getReg(); | |||
| 3722 | LLT ExtTy = MRI.getType(DstReg); | |||
| 3723 | ||||
| 3724 | // Propagate the extension into the block of each incoming reg's block. | |||
| 3725 | // Use a SetVector here because PHIs can have duplicate edges, and we want | |||
| 3726 | // deterministic iteration order. | |||
| 3727 | SmallSetVector<MachineInstr *, 8> SrcMIs; | |||
| 3728 | SmallDenseMap<MachineInstr *, MachineInstr *, 8> OldToNewSrcMap; | |||
| 3729 | for (unsigned SrcIdx = 1; SrcIdx < MI.getNumOperands(); SrcIdx += 2) { | |||
| 3730 | auto *SrcMI = MRI.getVRegDef(MI.getOperand(SrcIdx).getReg()); | |||
| 3731 | if (!SrcMIs.insert(SrcMI)) | |||
| 3732 | continue; | |||
| 3733 | ||||
| 3734 | // Build an extend after each src inst. | |||
| 3735 | auto *MBB = SrcMI->getParent(); | |||
| 3736 | MachineBasicBlock::iterator InsertPt = ++SrcMI->getIterator(); | |||
| 3737 | if (InsertPt != MBB->end() && InsertPt->isPHI()) | |||
| 3738 | InsertPt = MBB->getFirstNonPHI(); | |||
| 3739 | ||||
| 3740 | Builder.setInsertPt(*SrcMI->getParent(), InsertPt); | |||
| 3741 | Builder.setDebugLoc(MI.getDebugLoc()); | |||
| 3742 | auto NewExt = Builder.buildExtOrTrunc(ExtMI->getOpcode(), ExtTy, | |||
| 3743 | SrcMI->getOperand(0).getReg()); | |||
| 3744 | OldToNewSrcMap[SrcMI] = NewExt; | |||
| 3745 | } | |||
| 3746 | ||||
| 3747 | // Create a new phi with the extended inputs. | |||
| 3748 | Builder.setInstrAndDebugLoc(MI); | |||
| 3749 | auto NewPhi = Builder.buildInstrNoInsert(TargetOpcode::G_PHI); | |||
| 3750 | NewPhi.addDef(DstReg); | |||
| 3751 | for (const MachineOperand &MO : llvm::drop_begin(MI.operands())) { | |||
| 3752 | if (!MO.isReg()) { | |||
| 3753 | NewPhi.addMBB(MO.getMBB()); | |||
| 3754 | continue; | |||
| 3755 | } | |||
| 3756 | auto *NewSrc = OldToNewSrcMap[MRI.getVRegDef(MO.getReg())]; | |||
| 3757 | NewPhi.addUse(NewSrc->getOperand(0).getReg()); | |||
| 3758 | } | |||
| 3759 | Builder.insertInstr(NewPhi); | |||
| 3760 | ExtMI->eraseFromParent(); | |||
| 3761 | } | |||
| 3762 | ||||
| 3763 | bool CombinerHelper::matchExtractVecEltBuildVec(MachineInstr &MI, | |||
| 3764 | Register &Reg) { | |||
| 3765 | assert(MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_EXTRACT_VECTOR_ELT" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3765, __extension__ __PRETTY_FUNCTION__)); | |||
| 3766 | // If we have a constant index, look for a G_BUILD_VECTOR source | |||
| 3767 | // and find the source register that the index maps to. | |||
| 3768 | Register SrcVec = MI.getOperand(1).getReg(); | |||
| 3769 | LLT SrcTy = MRI.getType(SrcVec); | |||
| 3770 | ||||
| 3771 | auto Cst = getIConstantVRegValWithLookThrough(MI.getOperand(2).getReg(), MRI); | |||
| 3772 | if (!Cst || Cst->Value.getZExtValue() >= SrcTy.getNumElements()) | |||
| 3773 | return false; | |||
| 3774 | ||||
| 3775 | unsigned VecIdx = Cst->Value.getZExtValue(); | |||
| 3776 | ||||
| 3777 | // Check if we have a build_vector or build_vector_trunc with an optional | |||
| 3778 | // trunc in front. | |||
| 3779 | MachineInstr *SrcVecMI = MRI.getVRegDef(SrcVec); | |||
| 3780 | if (SrcVecMI->getOpcode() == TargetOpcode::G_TRUNC) { | |||
| 3781 | SrcVecMI = MRI.getVRegDef(SrcVecMI->getOperand(1).getReg()); | |||
| 3782 | } | |||
| 3783 | ||||
| 3784 | if (SrcVecMI->getOpcode() != TargetOpcode::G_BUILD_VECTOR && | |||
| 3785 | SrcVecMI->getOpcode() != TargetOpcode::G_BUILD_VECTOR_TRUNC) | |||
| 3786 | return false; | |||
| 3787 | ||||
| 3788 | EVT Ty(getMVTForLLT(SrcTy)); | |||
| 3789 | if (!MRI.hasOneNonDBGUse(SrcVec) && | |||
| 3790 | !getTargetLowering().aggressivelyPreferBuildVectorSources(Ty)) | |||
| 3791 | return false; | |||
| 3792 | ||||
| 3793 | Reg = SrcVecMI->getOperand(VecIdx + 1).getReg(); | |||
| 3794 | return true; | |||
| 3795 | } | |||
| 3796 | ||||
| 3797 | void CombinerHelper::applyExtractVecEltBuildVec(MachineInstr &MI, | |||
| 3798 | Register &Reg) { | |||
| 3799 | // Check the type of the register, since it may have come from a | |||
| 3800 | // G_BUILD_VECTOR_TRUNC. | |||
| 3801 | LLT ScalarTy = MRI.getType(Reg); | |||
| 3802 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 3803 | LLT DstTy = MRI.getType(DstReg); | |||
| 3804 | ||||
| 3805 | Builder.setInstrAndDebugLoc(MI); | |||
| 3806 | if (ScalarTy != DstTy) { | |||
| 3807 | assert(ScalarTy.getSizeInBits() > DstTy.getSizeInBits())(static_cast <bool> (ScalarTy.getSizeInBits() > DstTy .getSizeInBits()) ? void (0) : __assert_fail ("ScalarTy.getSizeInBits() > DstTy.getSizeInBits()" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3807, __extension__ __PRETTY_FUNCTION__)); | |||
| 3808 | Builder.buildTrunc(DstReg, Reg); | |||
| 3809 | MI.eraseFromParent(); | |||
| 3810 | return; | |||
| 3811 | } | |||
| 3812 | replaceSingleDefInstWithReg(MI, Reg); | |||
| 3813 | } | |||
| 3814 | ||||
| 3815 | bool CombinerHelper::matchExtractAllEltsFromBuildVector( | |||
| 3816 | MachineInstr &MI, | |||
| 3817 | SmallVectorImpl<std::pair<Register, MachineInstr *>> &SrcDstPairs) { | |||
| 3818 | assert(MI.getOpcode() == TargetOpcode::G_BUILD_VECTOR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_BUILD_VECTOR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_BUILD_VECTOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3818, __extension__ __PRETTY_FUNCTION__)); | |||
| 3819 | // This combine tries to find build_vector's which have every source element | |||
| 3820 | // extracted using G_EXTRACT_VECTOR_ELT. This can happen when transforms like | |||
| 3821 | // the masked load scalarization is run late in the pipeline. There's already | |||
| 3822 | // a combine for a similar pattern starting from the extract, but that | |||
| 3823 | // doesn't attempt to do it if there are multiple uses of the build_vector, | |||
| 3824 | // which in this case is true. Starting the combine from the build_vector | |||
| 3825 | // feels more natural than trying to find sibling nodes of extracts. | |||
| 3826 | // E.g. | |||
| 3827 | // %vec(<4 x s32>) = G_BUILD_VECTOR %s1(s32), %s2, %s3, %s4 | |||
| 3828 | // %ext1 = G_EXTRACT_VECTOR_ELT %vec, 0 | |||
| 3829 | // %ext2 = G_EXTRACT_VECTOR_ELT %vec, 1 | |||
| 3830 | // %ext3 = G_EXTRACT_VECTOR_ELT %vec, 2 | |||
| 3831 | // %ext4 = G_EXTRACT_VECTOR_ELT %vec, 3 | |||
| 3832 | // ==> | |||
| 3833 | // replace ext{1,2,3,4} with %s{1,2,3,4} | |||
| 3834 | ||||
| 3835 | Register DstReg = MI.getOperand(0).getReg(); | |||
| 3836 | LLT DstTy = MRI.getType(DstReg); | |||
| 3837 | unsigned NumElts = DstTy.getNumElements(); | |||
| 3838 | ||||
| 3839 | SmallBitVector ExtractedElts(NumElts); | |||
| 3840 | for (MachineInstr &II : MRI.use_nodbg_instructions(DstReg)) { | |||
| 3841 | if (II.getOpcode() != TargetOpcode::G_EXTRACT_VECTOR_ELT) | |||
| 3842 | return false; | |||
| 3843 | auto Cst = getIConstantVRegVal(II.getOperand(2).getReg(), MRI); | |||
| 3844 | if (!Cst) | |||
| 3845 | return false; | |||
| 3846 | unsigned Idx = Cst->getZExtValue(); | |||
| 3847 | if (Idx >= NumElts) | |||
| 3848 | return false; // Out of range. | |||
| 3849 | ExtractedElts.set(Idx); | |||
| 3850 | SrcDstPairs.emplace_back( | |||
| 3851 | std::make_pair(MI.getOperand(Idx + 1).getReg(), &II)); | |||
| 3852 | } | |||
| 3853 | // Match if every element was extracted. | |||
| 3854 | return ExtractedElts.all(); | |||
| 3855 | } | |||
| 3856 | ||||
| 3857 | void CombinerHelper::applyExtractAllEltsFromBuildVector( | |||
| 3858 | MachineInstr &MI, | |||
| 3859 | SmallVectorImpl<std::pair<Register, MachineInstr *>> &SrcDstPairs) { | |||
| 3860 | assert(MI.getOpcode() == TargetOpcode::G_BUILD_VECTOR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_BUILD_VECTOR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_BUILD_VECTOR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3860, __extension__ __PRETTY_FUNCTION__)); | |||
| 3861 | for (auto &Pair : SrcDstPairs) { | |||
| 3862 | auto *ExtMI = Pair.second; | |||
| 3863 | replaceRegWith(MRI, ExtMI->getOperand(0).getReg(), Pair.first); | |||
| 3864 | ExtMI->eraseFromParent(); | |||
| 3865 | } | |||
| 3866 | MI.eraseFromParent(); | |||
| 3867 | } | |||
| 3868 | ||||
| 3869 | void CombinerHelper::applyBuildFn( | |||
| 3870 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 3871 | Builder.setInstrAndDebugLoc(MI); | |||
| 3872 | MatchInfo(Builder); | |||
| 3873 | MI.eraseFromParent(); | |||
| 3874 | } | |||
| 3875 | ||||
| 3876 | void CombinerHelper::applyBuildFnNoErase( | |||
| 3877 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 3878 | Builder.setInstrAndDebugLoc(MI); | |||
| 3879 | MatchInfo(Builder); | |||
| 3880 | } | |||
| 3881 | ||||
| 3882 | bool CombinerHelper::matchOrShiftToFunnelShift(MachineInstr &MI, | |||
| 3883 | BuildFnTy &MatchInfo) { | |||
| 3884 | assert(MI.getOpcode() == TargetOpcode::G_OR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_OR ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_OR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3884, __extension__ __PRETTY_FUNCTION__)); | |||
| 3885 | ||||
| 3886 | Register Dst = MI.getOperand(0).getReg(); | |||
| 3887 | LLT Ty = MRI.getType(Dst); | |||
| 3888 | unsigned BitWidth = Ty.getScalarSizeInBits(); | |||
| 3889 | ||||
| 3890 | Register ShlSrc, ShlAmt, LShrSrc, LShrAmt, Amt; | |||
| 3891 | unsigned FshOpc = 0; | |||
| 3892 | ||||
| 3893 | // Match (or (shl ...), (lshr ...)). | |||
| 3894 | if (!mi_match(Dst, MRI, | |||
| 3895 | // m_GOr() handles the commuted version as well. | |||
| 3896 | m_GOr(m_GShl(m_Reg(ShlSrc), m_Reg(ShlAmt)), | |||
| 3897 | m_GLShr(m_Reg(LShrSrc), m_Reg(LShrAmt))))) | |||
| 3898 | return false; | |||
| 3899 | ||||
| 3900 | // Given constants C0 and C1 such that C0 + C1 is bit-width: | |||
| 3901 | // (or (shl x, C0), (lshr y, C1)) -> (fshl x, y, C0) or (fshr x, y, C1) | |||
| 3902 | int64_t CstShlAmt, CstLShrAmt; | |||
| 3903 | if (mi_match(ShlAmt, MRI, m_ICstOrSplat(CstShlAmt)) && | |||
| 3904 | mi_match(LShrAmt, MRI, m_ICstOrSplat(CstLShrAmt)) && | |||
| 3905 | CstShlAmt + CstLShrAmt == BitWidth) { | |||
| 3906 | FshOpc = TargetOpcode::G_FSHR; | |||
| 3907 | Amt = LShrAmt; | |||
| 3908 | ||||
| 3909 | } else if (mi_match(LShrAmt, MRI, | |||
| 3910 | m_GSub(m_SpecificICstOrSplat(BitWidth), m_Reg(Amt))) && | |||
| 3911 | ShlAmt == Amt) { | |||
| 3912 | // (or (shl x, amt), (lshr y, (sub bw, amt))) -> (fshl x, y, amt) | |||
| 3913 | FshOpc = TargetOpcode::G_FSHL; | |||
| 3914 | ||||
| 3915 | } else if (mi_match(ShlAmt, MRI, | |||
| 3916 | m_GSub(m_SpecificICstOrSplat(BitWidth), m_Reg(Amt))) && | |||
| 3917 | LShrAmt == Amt) { | |||
| 3918 | // (or (shl x, (sub bw, amt)), (lshr y, amt)) -> (fshr x, y, amt) | |||
| 3919 | FshOpc = TargetOpcode::G_FSHR; | |||
| 3920 | ||||
| 3921 | } else { | |||
| 3922 | return false; | |||
| 3923 | } | |||
| 3924 | ||||
| 3925 | LLT AmtTy = MRI.getType(Amt); | |||
| 3926 | if (!isLegalOrBeforeLegalizer({FshOpc, {Ty, AmtTy}})) | |||
| 3927 | return false; | |||
| 3928 | ||||
| 3929 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 3930 | B.buildInstr(FshOpc, {Dst}, {ShlSrc, LShrSrc, Amt}); | |||
| 3931 | }; | |||
| 3932 | return true; | |||
| 3933 | } | |||
| 3934 | ||||
| 3935 | /// Match an FSHL or FSHR that can be combined to a ROTR or ROTL rotate. | |||
| 3936 | bool CombinerHelper::matchFunnelShiftToRotate(MachineInstr &MI) { | |||
| 3937 | unsigned Opc = MI.getOpcode(); | |||
| 3938 | assert(Opc == TargetOpcode::G_FSHL || Opc == TargetOpcode::G_FSHR)(static_cast <bool> (Opc == TargetOpcode::G_FSHL || Opc == TargetOpcode::G_FSHR) ? void (0) : __assert_fail ("Opc == TargetOpcode::G_FSHL || Opc == TargetOpcode::G_FSHR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3938, __extension__ __PRETTY_FUNCTION__)); | |||
| 3939 | Register X = MI.getOperand(1).getReg(); | |||
| 3940 | Register Y = MI.getOperand(2).getReg(); | |||
| 3941 | if (X != Y) | |||
| 3942 | return false; | |||
| 3943 | unsigned RotateOpc = | |||
| 3944 | Opc == TargetOpcode::G_FSHL ? TargetOpcode::G_ROTL : TargetOpcode::G_ROTR; | |||
| 3945 | return isLegalOrBeforeLegalizer({RotateOpc, {MRI.getType(X), MRI.getType(Y)}}); | |||
| 3946 | } | |||
| 3947 | ||||
| 3948 | void CombinerHelper::applyFunnelShiftToRotate(MachineInstr &MI) { | |||
| 3949 | unsigned Opc = MI.getOpcode(); | |||
| 3950 | assert(Opc == TargetOpcode::G_FSHL || Opc == TargetOpcode::G_FSHR)(static_cast <bool> (Opc == TargetOpcode::G_FSHL || Opc == TargetOpcode::G_FSHR) ? void (0) : __assert_fail ("Opc == TargetOpcode::G_FSHL || Opc == TargetOpcode::G_FSHR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3950, __extension__ __PRETTY_FUNCTION__)); | |||
| 3951 | bool IsFSHL = Opc == TargetOpcode::G_FSHL; | |||
| 3952 | Observer.changingInstr(MI); | |||
| 3953 | MI.setDesc(Builder.getTII().get(IsFSHL ? TargetOpcode::G_ROTL | |||
| 3954 | : TargetOpcode::G_ROTR)); | |||
| 3955 | MI.removeOperand(2); | |||
| 3956 | Observer.changedInstr(MI); | |||
| 3957 | } | |||
| 3958 | ||||
| 3959 | // Fold (rot x, c) -> (rot x, c % BitSize) | |||
| 3960 | bool CombinerHelper::matchRotateOutOfRange(MachineInstr &MI) { | |||
| 3961 | assert(MI.getOpcode() == TargetOpcode::G_ROTL ||(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3962, __extension__ __PRETTY_FUNCTION__)) | |||
| 3962 | MI.getOpcode() == TargetOpcode::G_ROTR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3962, __extension__ __PRETTY_FUNCTION__)); | |||
| 3963 | unsigned Bitsize = | |||
| 3964 | MRI.getType(MI.getOperand(0).getReg()).getScalarSizeInBits(); | |||
| 3965 | Register AmtReg = MI.getOperand(2).getReg(); | |||
| 3966 | bool OutOfRange = false; | |||
| 3967 | auto MatchOutOfRange = [Bitsize, &OutOfRange](const Constant *C) { | |||
| 3968 | if (auto *CI = dyn_cast<ConstantInt>(C)) | |||
| 3969 | OutOfRange |= CI->getValue().uge(Bitsize); | |||
| 3970 | return true; | |||
| 3971 | }; | |||
| 3972 | return matchUnaryPredicate(MRI, AmtReg, MatchOutOfRange) && OutOfRange; | |||
| 3973 | } | |||
| 3974 | ||||
| 3975 | void CombinerHelper::applyRotateOutOfRange(MachineInstr &MI) { | |||
| 3976 | assert(MI.getOpcode() == TargetOpcode::G_ROTL ||(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3977, __extension__ __PRETTY_FUNCTION__)) | |||
| 3977 | MI.getOpcode() == TargetOpcode::G_ROTR)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ROTL || MI.getOpcode() == TargetOpcode::G_ROTR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3977, __extension__ __PRETTY_FUNCTION__)); | |||
| 3978 | unsigned Bitsize = | |||
| 3979 | MRI.getType(MI.getOperand(0).getReg()).getScalarSizeInBits(); | |||
| 3980 | Builder.setInstrAndDebugLoc(MI); | |||
| 3981 | Register Amt = MI.getOperand(2).getReg(); | |||
| 3982 | LLT AmtTy = MRI.getType(Amt); | |||
| 3983 | auto Bits = Builder.buildConstant(AmtTy, Bitsize); | |||
| 3984 | Amt = Builder.buildURem(AmtTy, MI.getOperand(2).getReg(), Bits).getReg(0); | |||
| 3985 | Observer.changingInstr(MI); | |||
| 3986 | MI.getOperand(2).setReg(Amt); | |||
| 3987 | Observer.changedInstr(MI); | |||
| 3988 | } | |||
| 3989 | ||||
| 3990 | bool CombinerHelper::matchICmpToTrueFalseKnownBits(MachineInstr &MI, | |||
| 3991 | int64_t &MatchInfo) { | |||
| 3992 | assert(MI.getOpcode() == TargetOpcode::G_ICMP)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ICMP ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ICMP" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3992, __extension__ __PRETTY_FUNCTION__)); | |||
| 3993 | auto Pred = static_cast<CmpInst::Predicate>(MI.getOperand(1).getPredicate()); | |||
| 3994 | auto KnownLHS = KB->getKnownBits(MI.getOperand(2).getReg()); | |||
| 3995 | auto KnownRHS = KB->getKnownBits(MI.getOperand(3).getReg()); | |||
| 3996 | std::optional<bool> KnownVal; | |||
| 3997 | switch (Pred) { | |||
| 3998 | default: | |||
| 3999 | llvm_unreachable("Unexpected G_ICMP predicate?")::llvm::llvm_unreachable_internal("Unexpected G_ICMP predicate?" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 3999); | |||
| 4000 | case CmpInst::ICMP_EQ: | |||
| 4001 | KnownVal = KnownBits::eq(KnownLHS, KnownRHS); | |||
| 4002 | break; | |||
| 4003 | case CmpInst::ICMP_NE: | |||
| 4004 | KnownVal = KnownBits::ne(KnownLHS, KnownRHS); | |||
| 4005 | break; | |||
| 4006 | case CmpInst::ICMP_SGE: | |||
| 4007 | KnownVal = KnownBits::sge(KnownLHS, KnownRHS); | |||
| 4008 | break; | |||
| 4009 | case CmpInst::ICMP_SGT: | |||
| 4010 | KnownVal = KnownBits::sgt(KnownLHS, KnownRHS); | |||
| 4011 | break; | |||
| 4012 | case CmpInst::ICMP_SLE: | |||
| 4013 | KnownVal = KnownBits::sle(KnownLHS, KnownRHS); | |||
| 4014 | break; | |||
| 4015 | case CmpInst::ICMP_SLT: | |||
| 4016 | KnownVal = KnownBits::slt(KnownLHS, KnownRHS); | |||
| 4017 | break; | |||
| 4018 | case CmpInst::ICMP_UGE: | |||
| 4019 | KnownVal = KnownBits::uge(KnownLHS, KnownRHS); | |||
| 4020 | break; | |||
| 4021 | case CmpInst::ICMP_UGT: | |||
| 4022 | KnownVal = KnownBits::ugt(KnownLHS, KnownRHS); | |||
| 4023 | break; | |||
| 4024 | case CmpInst::ICMP_ULE: | |||
| 4025 | KnownVal = KnownBits::ule(KnownLHS, KnownRHS); | |||
| 4026 | break; | |||
| 4027 | case CmpInst::ICMP_ULT: | |||
| 4028 | KnownVal = KnownBits::ult(KnownLHS, KnownRHS); | |||
| 4029 | break; | |||
| 4030 | } | |||
| 4031 | if (!KnownVal) | |||
| 4032 | return false; | |||
| 4033 | MatchInfo = | |||
| 4034 | *KnownVal | |||
| 4035 | ? getICmpTrueVal(getTargetLowering(), | |||
| 4036 | /*IsVector = */ | |||
| 4037 | MRI.getType(MI.getOperand(0).getReg()).isVector(), | |||
| 4038 | /* IsFP = */ false) | |||
| 4039 | : 0; | |||
| 4040 | return true; | |||
| 4041 | } | |||
| 4042 | ||||
| 4043 | bool CombinerHelper::matchICmpToLHSKnownBits( | |||
| 4044 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 4045 | assert(MI.getOpcode() == TargetOpcode::G_ICMP)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ICMP ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ICMP" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4045, __extension__ __PRETTY_FUNCTION__)); | |||
| 4046 | // Given: | |||
| 4047 | // | |||
| 4048 | // %x = G_WHATEVER (... x is known to be 0 or 1 ...) | |||
| 4049 | // %cmp = G_ICMP ne %x, 0 | |||
| 4050 | // | |||
| 4051 | // Or: | |||
| 4052 | // | |||
| 4053 | // %x = G_WHATEVER (... x is known to be 0 or 1 ...) | |||
| 4054 | // %cmp = G_ICMP eq %x, 1 | |||
| 4055 | // | |||
| 4056 | // We can replace %cmp with %x assuming true is 1 on the target. | |||
| 4057 | auto Pred = static_cast<CmpInst::Predicate>(MI.getOperand(1).getPredicate()); | |||
| 4058 | if (!CmpInst::isEquality(Pred)) | |||
| 4059 | return false; | |||
| 4060 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4061 | LLT DstTy = MRI.getType(Dst); | |||
| 4062 | if (getICmpTrueVal(getTargetLowering(), DstTy.isVector(), | |||
| 4063 | /* IsFP = */ false) != 1) | |||
| 4064 | return false; | |||
| 4065 | int64_t OneOrZero = Pred == CmpInst::ICMP_EQ; | |||
| 4066 | if (!mi_match(MI.getOperand(3).getReg(), MRI, m_SpecificICst(OneOrZero))) | |||
| 4067 | return false; | |||
| 4068 | Register LHS = MI.getOperand(2).getReg(); | |||
| 4069 | auto KnownLHS = KB->getKnownBits(LHS); | |||
| 4070 | if (KnownLHS.getMinValue() != 0 || KnownLHS.getMaxValue() != 1) | |||
| 4071 | return false; | |||
| 4072 | // Make sure replacing Dst with the LHS is a legal operation. | |||
| 4073 | LLT LHSTy = MRI.getType(LHS); | |||
| 4074 | unsigned LHSSize = LHSTy.getSizeInBits(); | |||
| 4075 | unsigned DstSize = DstTy.getSizeInBits(); | |||
| 4076 | unsigned Op = TargetOpcode::COPY; | |||
| 4077 | if (DstSize != LHSSize) | |||
| 4078 | Op = DstSize < LHSSize ? TargetOpcode::G_TRUNC : TargetOpcode::G_ZEXT; | |||
| 4079 | if (!isLegalOrBeforeLegalizer({Op, {DstTy, LHSTy}})) | |||
| 4080 | return false; | |||
| 4081 | MatchInfo = [=](MachineIRBuilder &B) { B.buildInstr(Op, {Dst}, {LHS}); }; | |||
| 4082 | return true; | |||
| 4083 | } | |||
| 4084 | ||||
| 4085 | // Replace (and (or x, c1), c2) with (and x, c2) iff c1 & c2 == 0 | |||
| 4086 | bool CombinerHelper::matchAndOrDisjointMask( | |||
| 4087 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 4088 | assert(MI.getOpcode() == TargetOpcode::G_AND)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_AND ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_AND" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4088, __extension__ __PRETTY_FUNCTION__)); | |||
| 4089 | ||||
| 4090 | // Ignore vector types to simplify matching the two constants. | |||
| 4091 | // TODO: do this for vectors and scalars via a demanded bits analysis. | |||
| 4092 | LLT Ty = MRI.getType(MI.getOperand(0).getReg()); | |||
| 4093 | if (Ty.isVector()) | |||
| 4094 | return false; | |||
| 4095 | ||||
| 4096 | Register Src; | |||
| 4097 | Register AndMaskReg; | |||
| 4098 | int64_t AndMaskBits; | |||
| 4099 | int64_t OrMaskBits; | |||
| 4100 | if (!mi_match(MI, MRI, | |||
| 4101 | m_GAnd(m_GOr(m_Reg(Src), m_ICst(OrMaskBits)), | |||
| 4102 | m_all_of(m_ICst(AndMaskBits), m_Reg(AndMaskReg))))) | |||
| 4103 | return false; | |||
| 4104 | ||||
| 4105 | // Check if OrMask could turn on any bits in Src. | |||
| 4106 | if (AndMaskBits & OrMaskBits) | |||
| 4107 | return false; | |||
| 4108 | ||||
| 4109 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 4110 | Observer.changingInstr(MI); | |||
| 4111 | // Canonicalize the result to have the constant on the RHS. | |||
| 4112 | if (MI.getOperand(1).getReg() == AndMaskReg) | |||
| 4113 | MI.getOperand(2).setReg(AndMaskReg); | |||
| 4114 | MI.getOperand(1).setReg(Src); | |||
| 4115 | Observer.changedInstr(MI); | |||
| 4116 | }; | |||
| 4117 | return true; | |||
| 4118 | } | |||
| 4119 | ||||
| 4120 | /// Form a G_SBFX from a G_SEXT_INREG fed by a right shift. | |||
| 4121 | bool CombinerHelper::matchBitfieldExtractFromSExtInReg( | |||
| 4122 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 4123 | assert(MI.getOpcode() == TargetOpcode::G_SEXT_INREG)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SEXT_INREG ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SEXT_INREG" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4123, __extension__ __PRETTY_FUNCTION__)); | |||
| 4124 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4125 | Register Src = MI.getOperand(1).getReg(); | |||
| 4126 | LLT Ty = MRI.getType(Src); | |||
| 4127 | LLT ExtractTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4128 | if (!LI || !LI->isLegalOrCustom({TargetOpcode::G_SBFX, {Ty, ExtractTy}})) | |||
| 4129 | return false; | |||
| 4130 | int64_t Width = MI.getOperand(2).getImm(); | |||
| 4131 | Register ShiftSrc; | |||
| 4132 | int64_t ShiftImm; | |||
| 4133 | if (!mi_match( | |||
| 4134 | Src, MRI, | |||
| 4135 | m_OneNonDBGUse(m_any_of(m_GAShr(m_Reg(ShiftSrc), m_ICst(ShiftImm)), | |||
| 4136 | m_GLShr(m_Reg(ShiftSrc), m_ICst(ShiftImm)))))) | |||
| 4137 | return false; | |||
| 4138 | if (ShiftImm < 0 || ShiftImm + Width > Ty.getScalarSizeInBits()) | |||
| 4139 | return false; | |||
| 4140 | ||||
| 4141 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4142 | auto Cst1 = B.buildConstant(ExtractTy, ShiftImm); | |||
| 4143 | auto Cst2 = B.buildConstant(ExtractTy, Width); | |||
| 4144 | B.buildSbfx(Dst, ShiftSrc, Cst1, Cst2); | |||
| 4145 | }; | |||
| 4146 | return true; | |||
| 4147 | } | |||
| 4148 | ||||
| 4149 | /// Form a G_UBFX from "(a srl b) & mask", where b and mask are constants. | |||
| 4150 | bool CombinerHelper::matchBitfieldExtractFromAnd( | |||
| 4151 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 4152 | assert(MI.getOpcode() == TargetOpcode::G_AND)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_AND ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_AND" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4152, __extension__ __PRETTY_FUNCTION__)); | |||
| 4153 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4154 | LLT Ty = MRI.getType(Dst); | |||
| 4155 | LLT ExtractTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4156 | if (!getTargetLowering().isConstantUnsignedBitfieldExtractLegal( | |||
| 4157 | TargetOpcode::G_UBFX, Ty, ExtractTy)) | |||
| 4158 | return false; | |||
| 4159 | ||||
| 4160 | int64_t AndImm, LSBImm; | |||
| 4161 | Register ShiftSrc; | |||
| 4162 | const unsigned Size = Ty.getScalarSizeInBits(); | |||
| 4163 | if (!mi_match(MI.getOperand(0).getReg(), MRI, | |||
| 4164 | m_GAnd(m_OneNonDBGUse(m_GLShr(m_Reg(ShiftSrc), m_ICst(LSBImm))), | |||
| 4165 | m_ICst(AndImm)))) | |||
| 4166 | return false; | |||
| 4167 | ||||
| 4168 | // The mask is a mask of the low bits iff imm & (imm+1) == 0. | |||
| 4169 | auto MaybeMask = static_cast<uint64_t>(AndImm); | |||
| 4170 | if (MaybeMask & (MaybeMask + 1)) | |||
| 4171 | return false; | |||
| 4172 | ||||
| 4173 | // LSB must fit within the register. | |||
| 4174 | if (static_cast<uint64_t>(LSBImm) >= Size) | |||
| 4175 | return false; | |||
| 4176 | ||||
| 4177 | uint64_t Width = APInt(Size, AndImm).countr_one(); | |||
| 4178 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4179 | auto WidthCst = B.buildConstant(ExtractTy, Width); | |||
| 4180 | auto LSBCst = B.buildConstant(ExtractTy, LSBImm); | |||
| 4181 | B.buildInstr(TargetOpcode::G_UBFX, {Dst}, {ShiftSrc, LSBCst, WidthCst}); | |||
| 4182 | }; | |||
| 4183 | return true; | |||
| 4184 | } | |||
| 4185 | ||||
| 4186 | bool CombinerHelper::matchBitfieldExtractFromShr( | |||
| 4187 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 4188 | const unsigned Opcode = MI.getOpcode(); | |||
| 4189 | assert(Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR)(static_cast <bool> (Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR) ? void (0) : __assert_fail ("Opcode == TargetOpcode::G_ASHR || Opcode == TargetOpcode::G_LSHR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4189, __extension__ __PRETTY_FUNCTION__)); | |||
| 4190 | ||||
| 4191 | const Register Dst = MI.getOperand(0).getReg(); | |||
| 4192 | ||||
| 4193 | const unsigned ExtrOpcode = Opcode == TargetOpcode::G_ASHR | |||
| 4194 | ? TargetOpcode::G_SBFX | |||
| 4195 | : TargetOpcode::G_UBFX; | |||
| 4196 | ||||
| 4197 | // Check if the type we would use for the extract is legal | |||
| 4198 | LLT Ty = MRI.getType(Dst); | |||
| 4199 | LLT ExtractTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4200 | if (!LI || !LI->isLegalOrCustom({ExtrOpcode, {Ty, ExtractTy}})) | |||
| 4201 | return false; | |||
| 4202 | ||||
| 4203 | Register ShlSrc; | |||
| 4204 | int64_t ShrAmt; | |||
| 4205 | int64_t ShlAmt; | |||
| 4206 | const unsigned Size = Ty.getScalarSizeInBits(); | |||
| 4207 | ||||
| 4208 | // Try to match shr (shl x, c1), c2 | |||
| 4209 | if (!mi_match(Dst, MRI, | |||
| 4210 | m_BinOp(Opcode, | |||
| 4211 | m_OneNonDBGUse(m_GShl(m_Reg(ShlSrc), m_ICst(ShlAmt))), | |||
| 4212 | m_ICst(ShrAmt)))) | |||
| 4213 | return false; | |||
| 4214 | ||||
| 4215 | // Make sure that the shift sizes can fit a bitfield extract | |||
| 4216 | if (ShlAmt < 0 || ShlAmt > ShrAmt || ShrAmt >= Size) | |||
| 4217 | return false; | |||
| 4218 | ||||
| 4219 | // Skip this combine if the G_SEXT_INREG combine could handle it | |||
| 4220 | if (Opcode == TargetOpcode::G_ASHR && ShlAmt == ShrAmt) | |||
| 4221 | return false; | |||
| 4222 | ||||
| 4223 | // Calculate start position and width of the extract | |||
| 4224 | const int64_t Pos = ShrAmt - ShlAmt; | |||
| 4225 | const int64_t Width = Size - ShrAmt; | |||
| 4226 | ||||
| 4227 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4228 | auto WidthCst = B.buildConstant(ExtractTy, Width); | |||
| 4229 | auto PosCst = B.buildConstant(ExtractTy, Pos); | |||
| 4230 | B.buildInstr(ExtrOpcode, {Dst}, {ShlSrc, PosCst, WidthCst}); | |||
| 4231 | }; | |||
| 4232 | return true; | |||
| 4233 | } | |||
| 4234 | ||||
| 4235 | bool CombinerHelper::matchBitfieldExtractFromShrAnd( | |||
| 4236 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 4237 | const unsigned Opcode = MI.getOpcode(); | |||
| 4238 | assert(Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_ASHR)(static_cast <bool> (Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_ASHR) ? void (0) : __assert_fail ("Opcode == TargetOpcode::G_LSHR || Opcode == TargetOpcode::G_ASHR" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4238, __extension__ __PRETTY_FUNCTION__)); | |||
| 4239 | ||||
| 4240 | const Register Dst = MI.getOperand(0).getReg(); | |||
| 4241 | LLT Ty = MRI.getType(Dst); | |||
| 4242 | LLT ExtractTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4243 | if (!getTargetLowering().isConstantUnsignedBitfieldExtractLegal( | |||
| 4244 | TargetOpcode::G_UBFX, Ty, ExtractTy)) | |||
| 4245 | return false; | |||
| 4246 | ||||
| 4247 | // Try to match shr (and x, c1), c2 | |||
| 4248 | Register AndSrc; | |||
| 4249 | int64_t ShrAmt; | |||
| 4250 | int64_t SMask; | |||
| 4251 | if (!mi_match(Dst, MRI, | |||
| 4252 | m_BinOp(Opcode, | |||
| 4253 | m_OneNonDBGUse(m_GAnd(m_Reg(AndSrc), m_ICst(SMask))), | |||
| 4254 | m_ICst(ShrAmt)))) | |||
| 4255 | return false; | |||
| 4256 | ||||
| 4257 | const unsigned Size = Ty.getScalarSizeInBits(); | |||
| 4258 | if (ShrAmt < 0 || ShrAmt >= Size) | |||
| 4259 | return false; | |||
| 4260 | ||||
| 4261 | // If the shift subsumes the mask, emit the 0 directly. | |||
| 4262 | if (0 == (SMask >> ShrAmt)) { | |||
| 4263 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4264 | B.buildConstant(Dst, 0); | |||
| 4265 | }; | |||
| 4266 | return true; | |||
| 4267 | } | |||
| 4268 | ||||
| 4269 | // Check that ubfx can do the extraction, with no holes in the mask. | |||
| 4270 | uint64_t UMask = SMask; | |||
| 4271 | UMask |= maskTrailingOnes<uint64_t>(ShrAmt); | |||
| 4272 | UMask &= maskTrailingOnes<uint64_t>(Size); | |||
| 4273 | if (!isMask_64(UMask)) | |||
| 4274 | return false; | |||
| 4275 | ||||
| 4276 | // Calculate start position and width of the extract. | |||
| 4277 | const int64_t Pos = ShrAmt; | |||
| 4278 | const int64_t Width = llvm::countr_one(UMask) - ShrAmt; | |||
| 4279 | ||||
| 4280 | // It's preferable to keep the shift, rather than form G_SBFX. | |||
| 4281 | // TODO: remove the G_AND via demanded bits analysis. | |||
| 4282 | if (Opcode == TargetOpcode::G_ASHR && Width + ShrAmt == Size) | |||
| 4283 | return false; | |||
| 4284 | ||||
| 4285 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4286 | auto WidthCst = B.buildConstant(ExtractTy, Width); | |||
| 4287 | auto PosCst = B.buildConstant(ExtractTy, Pos); | |||
| 4288 | B.buildInstr(TargetOpcode::G_UBFX, {Dst}, {AndSrc, PosCst, WidthCst}); | |||
| 4289 | }; | |||
| 4290 | return true; | |||
| 4291 | } | |||
| 4292 | ||||
| 4293 | bool CombinerHelper::reassociationCanBreakAddressingModePattern( | |||
| 4294 | MachineInstr &PtrAdd) { | |||
| 4295 | assert(PtrAdd.getOpcode() == TargetOpcode::G_PTR_ADD)(static_cast <bool> (PtrAdd.getOpcode() == TargetOpcode ::G_PTR_ADD) ? void (0) : __assert_fail ("PtrAdd.getOpcode() == TargetOpcode::G_PTR_ADD" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4295, __extension__ __PRETTY_FUNCTION__)); | |||
| 4296 | ||||
| 4297 | Register Src1Reg = PtrAdd.getOperand(1).getReg(); | |||
| 4298 | MachineInstr *Src1Def = getOpcodeDef(TargetOpcode::G_PTR_ADD, Src1Reg, MRI); | |||
| 4299 | if (!Src1Def) | |||
| 4300 | return false; | |||
| 4301 | ||||
| 4302 | Register Src2Reg = PtrAdd.getOperand(2).getReg(); | |||
| 4303 | ||||
| 4304 | if (MRI.hasOneNonDBGUse(Src1Reg)) | |||
| 4305 | return false; | |||
| 4306 | ||||
| 4307 | auto C1 = getIConstantVRegVal(Src1Def->getOperand(2).getReg(), MRI); | |||
| 4308 | if (!C1) | |||
| 4309 | return false; | |||
| 4310 | auto C2 = getIConstantVRegVal(Src2Reg, MRI); | |||
| 4311 | if (!C2) | |||
| 4312 | return false; | |||
| 4313 | ||||
| 4314 | const APInt &C1APIntVal = *C1; | |||
| 4315 | const APInt &C2APIntVal = *C2; | |||
| 4316 | const int64_t CombinedValue = (C1APIntVal + C2APIntVal).getSExtValue(); | |||
| 4317 | ||||
| 4318 | for (auto &UseMI : MRI.use_nodbg_instructions(Src1Reg)) { | |||
| 4319 | // This combine may end up running before ptrtoint/inttoptr combines | |||
| 4320 | // manage to eliminate redundant conversions, so try to look through them. | |||
| 4321 | MachineInstr *ConvUseMI = &UseMI; | |||
| 4322 | unsigned ConvUseOpc = ConvUseMI->getOpcode(); | |||
| 4323 | while (ConvUseOpc == TargetOpcode::G_INTTOPTR || | |||
| 4324 | ConvUseOpc == TargetOpcode::G_PTRTOINT) { | |||
| 4325 | Register DefReg = ConvUseMI->getOperand(0).getReg(); | |||
| 4326 | if (!MRI.hasOneNonDBGUse(DefReg)) | |||
| 4327 | break; | |||
| 4328 | ConvUseMI = &*MRI.use_instr_nodbg_begin(DefReg); | |||
| 4329 | ConvUseOpc = ConvUseMI->getOpcode(); | |||
| 4330 | } | |||
| 4331 | auto LoadStore = ConvUseOpc == TargetOpcode::G_LOAD || | |||
| 4332 | ConvUseOpc == TargetOpcode::G_STORE; | |||
| 4333 | if (!LoadStore) | |||
| 4334 | continue; | |||
| 4335 | // Is x[offset2] already not a legal addressing mode? If so then | |||
| 4336 | // reassociating the constants breaks nothing (we test offset2 because | |||
| 4337 | // that's the one we hope to fold into the load or store). | |||
| 4338 | TargetLoweringBase::AddrMode AM; | |||
| 4339 | AM.HasBaseReg = true; | |||
| 4340 | AM.BaseOffs = C2APIntVal.getSExtValue(); | |||
| 4341 | unsigned AS = | |||
| 4342 | MRI.getType(ConvUseMI->getOperand(1).getReg()).getAddressSpace(); | |||
| 4343 | Type *AccessTy = | |||
| 4344 | getTypeForLLT(MRI.getType(ConvUseMI->getOperand(0).getReg()), | |||
| 4345 | PtrAdd.getMF()->getFunction().getContext()); | |||
| 4346 | const auto &TLI = *PtrAdd.getMF()->getSubtarget().getTargetLowering(); | |||
| 4347 | if (!TLI.isLegalAddressingMode(PtrAdd.getMF()->getDataLayout(), AM, | |||
| 4348 | AccessTy, AS)) | |||
| 4349 | continue; | |||
| 4350 | ||||
| 4351 | // Would x[offset1+offset2] still be a legal addressing mode? | |||
| 4352 | AM.BaseOffs = CombinedValue; | |||
| 4353 | if (!TLI.isLegalAddressingMode(PtrAdd.getMF()->getDataLayout(), AM, | |||
| 4354 | AccessTy, AS)) | |||
| 4355 | return true; | |||
| 4356 | } | |||
| 4357 | ||||
| 4358 | return false; | |||
| 4359 | } | |||
| 4360 | ||||
| 4361 | bool CombinerHelper::matchReassocConstantInnerRHS(GPtrAdd &MI, | |||
| 4362 | MachineInstr *RHS, | |||
| 4363 | BuildFnTy &MatchInfo) { | |||
| 4364 | // G_PTR_ADD(BASE, G_ADD(X, C)) -> G_PTR_ADD(G_PTR_ADD(BASE, X), C) | |||
| 4365 | Register Src1Reg = MI.getOperand(1).getReg(); | |||
| 4366 | if (RHS->getOpcode() != TargetOpcode::G_ADD) | |||
| 4367 | return false; | |||
| 4368 | auto C2 = getIConstantVRegVal(RHS->getOperand(2).getReg(), MRI); | |||
| 4369 | if (!C2) | |||
| 4370 | return false; | |||
| 4371 | ||||
| 4372 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 4373 | LLT PtrTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 4374 | ||||
| 4375 | auto NewBase = | |||
| 4376 | Builder.buildPtrAdd(PtrTy, Src1Reg, RHS->getOperand(1).getReg()); | |||
| 4377 | Observer.changingInstr(MI); | |||
| 4378 | MI.getOperand(1).setReg(NewBase.getReg(0)); | |||
| 4379 | MI.getOperand(2).setReg(RHS->getOperand(2).getReg()); | |||
| 4380 | Observer.changedInstr(MI); | |||
| 4381 | }; | |||
| 4382 | return !reassociationCanBreakAddressingModePattern(MI); | |||
| 4383 | } | |||
| 4384 | ||||
| 4385 | bool CombinerHelper::matchReassocConstantInnerLHS(GPtrAdd &MI, | |||
| 4386 | MachineInstr *LHS, | |||
| 4387 | MachineInstr *RHS, | |||
| 4388 | BuildFnTy &MatchInfo) { | |||
| 4389 | // G_PTR_ADD (G_PTR_ADD X, C), Y) -> (G_PTR_ADD (G_PTR_ADD(X, Y), C) | |||
| 4390 | // if and only if (G_PTR_ADD X, C) has one use. | |||
| 4391 | Register LHSBase; | |||
| 4392 | std::optional<ValueAndVReg> LHSCstOff; | |||
| 4393 | if (!mi_match(MI.getBaseReg(), MRI, | |||
| 4394 | m_OneNonDBGUse(m_GPtrAdd(m_Reg(LHSBase), m_GCst(LHSCstOff))))) | |||
| 4395 | return false; | |||
| 4396 | ||||
| 4397 | auto *LHSPtrAdd = cast<GPtrAdd>(LHS); | |||
| 4398 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 4399 | // When we change LHSPtrAdd's offset register we might cause it to use a reg | |||
| 4400 | // before its def. Sink the instruction so the outer PTR_ADD to ensure this | |||
| 4401 | // doesn't happen. | |||
| 4402 | LHSPtrAdd->moveBefore(&MI); | |||
| 4403 | Register RHSReg = MI.getOffsetReg(); | |||
| 4404 | // set VReg will cause type mismatch if it comes from extend/trunc | |||
| 4405 | auto NewCst = B.buildConstant(MRI.getType(RHSReg), LHSCstOff->Value); | |||
| 4406 | Observer.changingInstr(MI); | |||
| 4407 | MI.getOperand(2).setReg(NewCst.getReg(0)); | |||
| 4408 | Observer.changedInstr(MI); | |||
| 4409 | Observer.changingInstr(*LHSPtrAdd); | |||
| 4410 | LHSPtrAdd->getOperand(2).setReg(RHSReg); | |||
| 4411 | Observer.changedInstr(*LHSPtrAdd); | |||
| 4412 | }; | |||
| 4413 | return !reassociationCanBreakAddressingModePattern(MI); | |||
| 4414 | } | |||
| 4415 | ||||
| 4416 | bool CombinerHelper::matchReassocFoldConstantsInSubTree(GPtrAdd &MI, | |||
| 4417 | MachineInstr *LHS, | |||
| 4418 | MachineInstr *RHS, | |||
| 4419 | BuildFnTy &MatchInfo) { | |||
| 4420 | // G_PTR_ADD(G_PTR_ADD(BASE, C1), C2) -> G_PTR_ADD(BASE, C1+C2) | |||
| 4421 | auto *LHSPtrAdd = dyn_cast<GPtrAdd>(LHS); | |||
| 4422 | if (!LHSPtrAdd) | |||
| 4423 | return false; | |||
| 4424 | ||||
| 4425 | Register Src2Reg = MI.getOperand(2).getReg(); | |||
| 4426 | Register LHSSrc1 = LHSPtrAdd->getBaseReg(); | |||
| 4427 | Register LHSSrc2 = LHSPtrAdd->getOffsetReg(); | |||
| 4428 | auto C1 = getIConstantVRegVal(LHSSrc2, MRI); | |||
| 4429 | if (!C1) | |||
| 4430 | return false; | |||
| 4431 | auto C2 = getIConstantVRegVal(Src2Reg, MRI); | |||
| 4432 | if (!C2) | |||
| 4433 | return false; | |||
| 4434 | ||||
| 4435 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 4436 | auto NewCst = B.buildConstant(MRI.getType(Src2Reg), *C1 + *C2); | |||
| 4437 | Observer.changingInstr(MI); | |||
| 4438 | MI.getOperand(1).setReg(LHSSrc1); | |||
| 4439 | MI.getOperand(2).setReg(NewCst.getReg(0)); | |||
| 4440 | Observer.changedInstr(MI); | |||
| 4441 | }; | |||
| 4442 | return !reassociationCanBreakAddressingModePattern(MI); | |||
| 4443 | } | |||
| 4444 | ||||
| 4445 | bool CombinerHelper::matchReassocPtrAdd(MachineInstr &MI, | |||
| 4446 | BuildFnTy &MatchInfo) { | |||
| 4447 | auto &PtrAdd = cast<GPtrAdd>(MI); | |||
| 4448 | // We're trying to match a few pointer computation patterns here for | |||
| 4449 | // re-association opportunities. | |||
| 4450 | // 1) Isolating a constant operand to be on the RHS, e.g.: | |||
| 4451 | // G_PTR_ADD(BASE, G_ADD(X, C)) -> G_PTR_ADD(G_PTR_ADD(BASE, X), C) | |||
| 4452 | // | |||
| 4453 | // 2) Folding two constants in each sub-tree as long as such folding | |||
| 4454 | // doesn't break a legal addressing mode. | |||
| 4455 | // G_PTR_ADD(G_PTR_ADD(BASE, C1), C2) -> G_PTR_ADD(BASE, C1+C2) | |||
| 4456 | // | |||
| 4457 | // 3) Move a constant from the LHS of an inner op to the RHS of the outer. | |||
| 4458 | // G_PTR_ADD (G_PTR_ADD X, C), Y) -> G_PTR_ADD (G_PTR_ADD(X, Y), C) | |||
| 4459 | // iif (G_PTR_ADD X, C) has one use. | |||
| 4460 | MachineInstr *LHS = MRI.getVRegDef(PtrAdd.getBaseReg()); | |||
| 4461 | MachineInstr *RHS = MRI.getVRegDef(PtrAdd.getOffsetReg()); | |||
| 4462 | ||||
| 4463 | // Try to match example 2. | |||
| 4464 | if (matchReassocFoldConstantsInSubTree(PtrAdd, LHS, RHS, MatchInfo)) | |||
| 4465 | return true; | |||
| 4466 | ||||
| 4467 | // Try to match example 3. | |||
| 4468 | if (matchReassocConstantInnerLHS(PtrAdd, LHS, RHS, MatchInfo)) | |||
| 4469 | return true; | |||
| 4470 | ||||
| 4471 | // Try to match example 1. | |||
| 4472 | if (matchReassocConstantInnerRHS(PtrAdd, RHS, MatchInfo)) | |||
| 4473 | return true; | |||
| 4474 | ||||
| 4475 | return false; | |||
| 4476 | } | |||
| 4477 | ||||
| 4478 | bool CombinerHelper::matchConstantFold(MachineInstr &MI, APInt &MatchInfo) { | |||
| 4479 | Register Op1 = MI.getOperand(1).getReg(); | |||
| 4480 | Register Op2 = MI.getOperand(2).getReg(); | |||
| 4481 | auto MaybeCst = ConstantFoldBinOp(MI.getOpcode(), Op1, Op2, MRI); | |||
| 4482 | if (!MaybeCst) | |||
| 4483 | return false; | |||
| 4484 | MatchInfo = *MaybeCst; | |||
| 4485 | return true; | |||
| 4486 | } | |||
| 4487 | ||||
| 4488 | bool CombinerHelper::matchNarrowBinopFeedingAnd( | |||
| 4489 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 4490 | // Look for a binop feeding into an AND with a mask: | |||
| 4491 | // | |||
| 4492 | // %add = G_ADD %lhs, %rhs | |||
| 4493 | // %and = G_AND %add, 000...11111111 | |||
| 4494 | // | |||
| 4495 | // Check if it's possible to perform the binop at a narrower width and zext | |||
| 4496 | // back to the original width like so: | |||
| 4497 | // | |||
| 4498 | // %narrow_lhs = G_TRUNC %lhs | |||
| 4499 | // %narrow_rhs = G_TRUNC %rhs | |||
| 4500 | // %narrow_add = G_ADD %narrow_lhs, %narrow_rhs | |||
| 4501 | // %new_add = G_ZEXT %narrow_add | |||
| 4502 | // %and = G_AND %new_add, 000...11111111 | |||
| 4503 | // | |||
| 4504 | // This can allow later combines to eliminate the G_AND if it turns out | |||
| 4505 | // that the mask is irrelevant. | |||
| 4506 | assert(MI.getOpcode() == TargetOpcode::G_AND)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_AND ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_AND" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4506, __extension__ __PRETTY_FUNCTION__)); | |||
| 4507 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4508 | Register AndLHS = MI.getOperand(1).getReg(); | |||
| 4509 | Register AndRHS = MI.getOperand(2).getReg(); | |||
| 4510 | LLT WideTy = MRI.getType(Dst); | |||
| 4511 | ||||
| 4512 | // If the potential binop has more than one use, then it's possible that one | |||
| 4513 | // of those uses will need its full width. | |||
| 4514 | if (!WideTy.isScalar() || !MRI.hasOneNonDBGUse(AndLHS)) | |||
| 4515 | return false; | |||
| 4516 | ||||
| 4517 | // Check if the LHS feeding the AND is impacted by the high bits that we're | |||
| 4518 | // masking out. | |||
| 4519 | // | |||
| 4520 | // e.g. for 64-bit x, y: | |||
| 4521 | // | |||
| 4522 | // add_64(x, y) & 65535 == zext(add_16(trunc(x), trunc(y))) & 65535 | |||
| 4523 | MachineInstr *LHSInst = getDefIgnoringCopies(AndLHS, MRI); | |||
| 4524 | if (!LHSInst) | |||
| 4525 | return false; | |||
| 4526 | unsigned LHSOpc = LHSInst->getOpcode(); | |||
| 4527 | switch (LHSOpc) { | |||
| 4528 | default: | |||
| 4529 | return false; | |||
| 4530 | case TargetOpcode::G_ADD: | |||
| 4531 | case TargetOpcode::G_SUB: | |||
| 4532 | case TargetOpcode::G_MUL: | |||
| 4533 | case TargetOpcode::G_AND: | |||
| 4534 | case TargetOpcode::G_OR: | |||
| 4535 | case TargetOpcode::G_XOR: | |||
| 4536 | break; | |||
| 4537 | } | |||
| 4538 | ||||
| 4539 | // Find the mask on the RHS. | |||
| 4540 | auto Cst = getIConstantVRegValWithLookThrough(AndRHS, MRI); | |||
| 4541 | if (!Cst) | |||
| 4542 | return false; | |||
| 4543 | auto Mask = Cst->Value; | |||
| 4544 | if (!Mask.isMask()) | |||
| 4545 | return false; | |||
| 4546 | ||||
| 4547 | // No point in combining if there's nothing to truncate. | |||
| 4548 | unsigned NarrowWidth = Mask.countr_one(); | |||
| 4549 | if (NarrowWidth == WideTy.getSizeInBits()) | |||
| 4550 | return false; | |||
| 4551 | LLT NarrowTy = LLT::scalar(NarrowWidth); | |||
| 4552 | ||||
| 4553 | // Check if adding the zext + truncates could be harmful. | |||
| 4554 | auto &MF = *MI.getMF(); | |||
| 4555 | const auto &TLI = getTargetLowering(); | |||
| 4556 | LLVMContext &Ctx = MF.getFunction().getContext(); | |||
| 4557 | auto &DL = MF.getDataLayout(); | |||
| 4558 | if (!TLI.isTruncateFree(WideTy, NarrowTy, DL, Ctx) || | |||
| 4559 | !TLI.isZExtFree(NarrowTy, WideTy, DL, Ctx)) | |||
| 4560 | return false; | |||
| 4561 | if (!isLegalOrBeforeLegalizer({TargetOpcode::G_TRUNC, {NarrowTy, WideTy}}) || | |||
| 4562 | !isLegalOrBeforeLegalizer({TargetOpcode::G_ZEXT, {WideTy, NarrowTy}})) | |||
| 4563 | return false; | |||
| 4564 | Register BinOpLHS = LHSInst->getOperand(1).getReg(); | |||
| 4565 | Register BinOpRHS = LHSInst->getOperand(2).getReg(); | |||
| 4566 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 4567 | auto NarrowLHS = Builder.buildTrunc(NarrowTy, BinOpLHS); | |||
| 4568 | auto NarrowRHS = Builder.buildTrunc(NarrowTy, BinOpRHS); | |||
| 4569 | auto NarrowBinOp = | |||
| 4570 | Builder.buildInstr(LHSOpc, {NarrowTy}, {NarrowLHS, NarrowRHS}); | |||
| 4571 | auto Ext = Builder.buildZExt(WideTy, NarrowBinOp); | |||
| 4572 | Observer.changingInstr(MI); | |||
| 4573 | MI.getOperand(1).setReg(Ext.getReg(0)); | |||
| 4574 | Observer.changedInstr(MI); | |||
| 4575 | }; | |||
| 4576 | return true; | |||
| 4577 | } | |||
| 4578 | ||||
| 4579 | bool CombinerHelper::matchMulOBy2(MachineInstr &MI, BuildFnTy &MatchInfo) { | |||
| 4580 | unsigned Opc = MI.getOpcode(); | |||
| 4581 | assert(Opc == TargetOpcode::G_UMULO || Opc == TargetOpcode::G_SMULO)(static_cast <bool> (Opc == TargetOpcode::G_UMULO || Opc == TargetOpcode::G_SMULO) ? void (0) : __assert_fail ("Opc == TargetOpcode::G_UMULO || Opc == TargetOpcode::G_SMULO" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4581, __extension__ __PRETTY_FUNCTION__)); | |||
| 4582 | ||||
| 4583 | if (!mi_match(MI.getOperand(3).getReg(), MRI, m_SpecificICstOrSplat(2))) | |||
| 4584 | return false; | |||
| 4585 | ||||
| 4586 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 4587 | Observer.changingInstr(MI); | |||
| 4588 | unsigned NewOpc = Opc == TargetOpcode::G_UMULO ? TargetOpcode::G_UADDO | |||
| 4589 | : TargetOpcode::G_SADDO; | |||
| 4590 | MI.setDesc(Builder.getTII().get(NewOpc)); | |||
| 4591 | MI.getOperand(3).setReg(MI.getOperand(2).getReg()); | |||
| 4592 | Observer.changedInstr(MI); | |||
| 4593 | }; | |||
| 4594 | return true; | |||
| 4595 | } | |||
| 4596 | ||||
| 4597 | bool CombinerHelper::matchMulOBy0(MachineInstr &MI, BuildFnTy &MatchInfo) { | |||
| 4598 | // (G_*MULO x, 0) -> 0 + no carry out | |||
| 4599 | assert(MI.getOpcode() == TargetOpcode::G_UMULO ||(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UMULO || MI.getOpcode() == TargetOpcode::G_SMULO) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UMULO || MI.getOpcode() == TargetOpcode::G_SMULO" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4600, __extension__ __PRETTY_FUNCTION__)) | |||
| 4600 | MI.getOpcode() == TargetOpcode::G_SMULO)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UMULO || MI.getOpcode() == TargetOpcode::G_SMULO) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UMULO || MI.getOpcode() == TargetOpcode::G_SMULO" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4600, __extension__ __PRETTY_FUNCTION__)); | |||
| 4601 | if (!mi_match(MI.getOperand(3).getReg(), MRI, m_SpecificICstOrSplat(0))) | |||
| 4602 | return false; | |||
| 4603 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4604 | Register Carry = MI.getOperand(1).getReg(); | |||
| 4605 | if (!isConstantLegalOrBeforeLegalizer(MRI.getType(Dst)) || | |||
| 4606 | !isConstantLegalOrBeforeLegalizer(MRI.getType(Carry))) | |||
| 4607 | return false; | |||
| 4608 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4609 | B.buildConstant(Dst, 0); | |||
| 4610 | B.buildConstant(Carry, 0); | |||
| 4611 | }; | |||
| 4612 | return true; | |||
| 4613 | } | |||
| 4614 | ||||
| 4615 | bool CombinerHelper::matchAddOBy0(MachineInstr &MI, BuildFnTy &MatchInfo) { | |||
| 4616 | // (G_*ADDO x, 0) -> x + no carry out | |||
| 4617 | assert(MI.getOpcode() == TargetOpcode::G_UADDO ||(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UADDO || MI.getOpcode() == TargetOpcode::G_SADDO) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UADDO || MI.getOpcode() == TargetOpcode::G_SADDO" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4618, __extension__ __PRETTY_FUNCTION__)) | |||
| 4618 | MI.getOpcode() == TargetOpcode::G_SADDO)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UADDO || MI.getOpcode() == TargetOpcode::G_SADDO) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UADDO || MI.getOpcode() == TargetOpcode::G_SADDO" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4618, __extension__ __PRETTY_FUNCTION__)); | |||
| 4619 | if (!mi_match(MI.getOperand(3).getReg(), MRI, m_SpecificICstOrSplat(0))) | |||
| 4620 | return false; | |||
| 4621 | Register Carry = MI.getOperand(1).getReg(); | |||
| 4622 | if (!isConstantLegalOrBeforeLegalizer(MRI.getType(Carry))) | |||
| 4623 | return false; | |||
| 4624 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4625 | Register LHS = MI.getOperand(2).getReg(); | |||
| 4626 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4627 | B.buildCopy(Dst, LHS); | |||
| 4628 | B.buildConstant(Carry, 0); | |||
| 4629 | }; | |||
| 4630 | return true; | |||
| 4631 | } | |||
| 4632 | ||||
| 4633 | bool CombinerHelper::matchAddEToAddO(MachineInstr &MI, BuildFnTy &MatchInfo) { | |||
| 4634 | // (G_*ADDE x, y, 0) -> (G_*ADDO x, y) | |||
| 4635 | // (G_*SUBE x, y, 0) -> (G_*SUBO x, y) | |||
| 4636 | assert(MI.getOpcode() == TargetOpcode::G_UADDE ||(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode:: G_SSUBE) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode::G_SSUBE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4639, __extension__ __PRETTY_FUNCTION__)) | |||
| 4637 | MI.getOpcode() == TargetOpcode::G_SADDE ||(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode:: G_SSUBE) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode::G_SSUBE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4639, __extension__ __PRETTY_FUNCTION__)) | |||
| 4638 | MI.getOpcode() == TargetOpcode::G_USUBE ||(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode:: G_SSUBE) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode::G_SSUBE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4639, __extension__ __PRETTY_FUNCTION__)) | |||
| 4639 | MI.getOpcode() == TargetOpcode::G_SSUBE)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode:: G_SSUBE) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UADDE || MI.getOpcode() == TargetOpcode::G_SADDE || MI.getOpcode() == TargetOpcode::G_USUBE || MI.getOpcode() == TargetOpcode::G_SSUBE" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4639, __extension__ __PRETTY_FUNCTION__)); | |||
| 4640 | if (!mi_match(MI.getOperand(4).getReg(), MRI, m_SpecificICstOrSplat(0))) | |||
| 4641 | return false; | |||
| 4642 | MatchInfo = [&](MachineIRBuilder &B) { | |||
| 4643 | unsigned NewOpcode; | |||
| ||||
| 4644 | switch (MI.getOpcode()) { | |||
| 4645 | case TargetOpcode::G_UADDE: | |||
| 4646 | NewOpcode = TargetOpcode::G_UADDO; | |||
| 4647 | break; | |||
| 4648 | case TargetOpcode::G_SADDE: | |||
| 4649 | NewOpcode = TargetOpcode::G_SADDO; | |||
| 4650 | break; | |||
| 4651 | case TargetOpcode::G_USUBE: | |||
| 4652 | NewOpcode = TargetOpcode::G_USUBO; | |||
| 4653 | break; | |||
| 4654 | case TargetOpcode::G_SSUBE: | |||
| 4655 | NewOpcode = TargetOpcode::G_SSUBO; | |||
| 4656 | break; | |||
| 4657 | } | |||
| 4658 | Observer.changingInstr(MI); | |||
| 4659 | MI.setDesc(B.getTII().get(NewOpcode)); | |||
| ||||
| 4660 | MI.removeOperand(4); | |||
| 4661 | Observer.changedInstr(MI); | |||
| 4662 | }; | |||
| 4663 | return true; | |||
| 4664 | } | |||
| 4665 | ||||
| 4666 | bool CombinerHelper::matchSubAddSameReg(MachineInstr &MI, | |||
| 4667 | BuildFnTy &MatchInfo) { | |||
| 4668 | assert(MI.getOpcode() == TargetOpcode::G_SUB)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SUB ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SUB" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4668, __extension__ __PRETTY_FUNCTION__)); | |||
| 4669 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4670 | // (x + y) - z -> x (if y == z) | |||
| 4671 | // (x + y) - z -> y (if x == z) | |||
| 4672 | Register X, Y, Z; | |||
| 4673 | if (mi_match(Dst, MRI, m_GSub(m_GAdd(m_Reg(X), m_Reg(Y)), m_Reg(Z)))) { | |||
| 4674 | Register ReplaceReg; | |||
| 4675 | int64_t CstX, CstY; | |||
| 4676 | if (Y == Z || (mi_match(Y, MRI, m_ICstOrSplat(CstY)) && | |||
| 4677 | mi_match(Z, MRI, m_SpecificICstOrSplat(CstY)))) | |||
| 4678 | ReplaceReg = X; | |||
| 4679 | else if (X == Z || (mi_match(X, MRI, m_ICstOrSplat(CstX)) && | |||
| 4680 | mi_match(Z, MRI, m_SpecificICstOrSplat(CstX)))) | |||
| 4681 | ReplaceReg = Y; | |||
| 4682 | if (ReplaceReg) { | |||
| 4683 | MatchInfo = [=](MachineIRBuilder &B) { B.buildCopy(Dst, ReplaceReg); }; | |||
| 4684 | return true; | |||
| 4685 | } | |||
| 4686 | } | |||
| 4687 | ||||
| 4688 | // x - (y + z) -> 0 - y (if x == z) | |||
| 4689 | // x - (y + z) -> 0 - z (if x == y) | |||
| 4690 | if (mi_match(Dst, MRI, m_GSub(m_Reg(X), m_GAdd(m_Reg(Y), m_Reg(Z))))) { | |||
| 4691 | Register ReplaceReg; | |||
| 4692 | int64_t CstX; | |||
| 4693 | if (X == Z || (mi_match(X, MRI, m_ICstOrSplat(CstX)) && | |||
| 4694 | mi_match(Z, MRI, m_SpecificICstOrSplat(CstX)))) | |||
| 4695 | ReplaceReg = Y; | |||
| 4696 | else if (X == Y || (mi_match(X, MRI, m_ICstOrSplat(CstX)) && | |||
| 4697 | mi_match(Y, MRI, m_SpecificICstOrSplat(CstX)))) | |||
| 4698 | ReplaceReg = Z; | |||
| 4699 | if (ReplaceReg) { | |||
| 4700 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 4701 | auto Zero = B.buildConstant(MRI.getType(Dst), 0); | |||
| 4702 | B.buildSub(Dst, Zero, ReplaceReg); | |||
| 4703 | }; | |||
| 4704 | return true; | |||
| 4705 | } | |||
| 4706 | } | |||
| 4707 | return false; | |||
| 4708 | } | |||
| 4709 | ||||
| 4710 | MachineInstr *CombinerHelper::buildUDivUsingMul(MachineInstr &MI) { | |||
| 4711 | assert(MI.getOpcode() == TargetOpcode::G_UDIV)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UDIV ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UDIV" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4711, __extension__ __PRETTY_FUNCTION__)); | |||
| 4712 | auto &UDiv = cast<GenericMachineInstr>(MI); | |||
| 4713 | Register Dst = UDiv.getReg(0); | |||
| 4714 | Register LHS = UDiv.getReg(1); | |||
| 4715 | Register RHS = UDiv.getReg(2); | |||
| 4716 | LLT Ty = MRI.getType(Dst); | |||
| 4717 | LLT ScalarTy = Ty.getScalarType(); | |||
| 4718 | const unsigned EltBits = ScalarTy.getScalarSizeInBits(); | |||
| 4719 | LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4720 | LLT ScalarShiftAmtTy = ShiftAmtTy.getScalarType(); | |||
| 4721 | auto &MIB = Builder; | |||
| 4722 | MIB.setInstrAndDebugLoc(MI); | |||
| 4723 | ||||
| 4724 | bool UseNPQ = false; | |||
| 4725 | SmallVector<Register, 16> PreShifts, PostShifts, MagicFactors, NPQFactors; | |||
| 4726 | ||||
| 4727 | auto BuildUDIVPattern = [&](const Constant *C) { | |||
| 4728 | auto *CI = cast<ConstantInt>(C); | |||
| 4729 | const APInt &Divisor = CI->getValue(); | |||
| 4730 | ||||
| 4731 | bool SelNPQ = false; | |||
| 4732 | APInt Magic(Divisor.getBitWidth(), 0); | |||
| 4733 | unsigned PreShift = 0, PostShift = 0; | |||
| 4734 | ||||
| 4735 | // Magic algorithm doesn't work for division by 1. We need to emit a select | |||
| 4736 | // at the end. | |||
| 4737 | // TODO: Use undef values for divisor of 1. | |||
| 4738 | if (!Divisor.isOne()) { | |||
| 4739 | UnsignedDivisionByConstantInfo magics = | |||
| 4740 | UnsignedDivisionByConstantInfo::get(Divisor); | |||
| 4741 | ||||
| 4742 | Magic = std::move(magics.Magic); | |||
| 4743 | ||||
| 4744 | assert(magics.PreShift < Divisor.getBitWidth() &&(static_cast <bool> (magics.PreShift < Divisor.getBitWidth () && "We shouldn't generate an undefined shift!") ? void (0) : __assert_fail ("magics.PreShift < Divisor.getBitWidth() && \"We shouldn't generate an undefined shift!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4745, __extension__ __PRETTY_FUNCTION__)) | |||
| 4745 | "We shouldn't generate an undefined shift!")(static_cast <bool> (magics.PreShift < Divisor.getBitWidth () && "We shouldn't generate an undefined shift!") ? void (0) : __assert_fail ("magics.PreShift < Divisor.getBitWidth() && \"We shouldn't generate an undefined shift!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4745, __extension__ __PRETTY_FUNCTION__)); | |||
| 4746 | assert(magics.PostShift < Divisor.getBitWidth() &&(static_cast <bool> (magics.PostShift < Divisor.getBitWidth () && "We shouldn't generate an undefined shift!") ? void (0) : __assert_fail ("magics.PostShift < Divisor.getBitWidth() && \"We shouldn't generate an undefined shift!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4747, __extension__ __PRETTY_FUNCTION__)) | |||
| 4747 | "We shouldn't generate an undefined shift!")(static_cast <bool> (magics.PostShift < Divisor.getBitWidth () && "We shouldn't generate an undefined shift!") ? void (0) : __assert_fail ("magics.PostShift < Divisor.getBitWidth() && \"We shouldn't generate an undefined shift!\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4747, __extension__ __PRETTY_FUNCTION__)); | |||
| 4748 | assert((!magics.IsAdd || magics.PreShift == 0) && "Unexpected pre-shift")(static_cast <bool> ((!magics.IsAdd || magics.PreShift == 0) && "Unexpected pre-shift") ? void (0) : __assert_fail ("(!magics.IsAdd || magics.PreShift == 0) && \"Unexpected pre-shift\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4748, __extension__ __PRETTY_FUNCTION__)); | |||
| 4749 | PreShift = magics.PreShift; | |||
| 4750 | PostShift = magics.PostShift; | |||
| 4751 | SelNPQ = magics.IsAdd; | |||
| 4752 | } | |||
| 4753 | ||||
| 4754 | PreShifts.push_back( | |||
| 4755 | MIB.buildConstant(ScalarShiftAmtTy, PreShift).getReg(0)); | |||
| 4756 | MagicFactors.push_back(MIB.buildConstant(ScalarTy, Magic).getReg(0)); | |||
| 4757 | NPQFactors.push_back( | |||
| 4758 | MIB.buildConstant(ScalarTy, | |||
| 4759 | SelNPQ ? APInt::getOneBitSet(EltBits, EltBits - 1) | |||
| 4760 | : APInt::getZero(EltBits)) | |||
| 4761 | .getReg(0)); | |||
| 4762 | PostShifts.push_back( | |||
| 4763 | MIB.buildConstant(ScalarShiftAmtTy, PostShift).getReg(0)); | |||
| 4764 | UseNPQ |= SelNPQ; | |||
| 4765 | return true; | |||
| 4766 | }; | |||
| 4767 | ||||
| 4768 | // Collect the shifts/magic values from each element. | |||
| 4769 | bool Matched = matchUnaryPredicate(MRI, RHS, BuildUDIVPattern); | |||
| 4770 | (void)Matched; | |||
| 4771 | assert(Matched && "Expected unary predicate match to succeed")(static_cast <bool> (Matched && "Expected unary predicate match to succeed" ) ? void (0) : __assert_fail ("Matched && \"Expected unary predicate match to succeed\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4771, __extension__ __PRETTY_FUNCTION__)); | |||
| 4772 | ||||
| 4773 | Register PreShift, PostShift, MagicFactor, NPQFactor; | |||
| 4774 | auto *RHSDef = getOpcodeDef<GBuildVector>(RHS, MRI); | |||
| 4775 | if (RHSDef) { | |||
| 4776 | PreShift = MIB.buildBuildVector(ShiftAmtTy, PreShifts).getReg(0); | |||
| 4777 | MagicFactor = MIB.buildBuildVector(Ty, MagicFactors).getReg(0); | |||
| 4778 | NPQFactor = MIB.buildBuildVector(Ty, NPQFactors).getReg(0); | |||
| 4779 | PostShift = MIB.buildBuildVector(ShiftAmtTy, PostShifts).getReg(0); | |||
| 4780 | } else { | |||
| 4781 | assert(MRI.getType(RHS).isScalar() &&(static_cast <bool> (MRI.getType(RHS).isScalar() && "Non-build_vector operation should have been a scalar") ? void (0) : __assert_fail ("MRI.getType(RHS).isScalar() && \"Non-build_vector operation should have been a scalar\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4782, __extension__ __PRETTY_FUNCTION__)) | |||
| 4782 | "Non-build_vector operation should have been a scalar")(static_cast <bool> (MRI.getType(RHS).isScalar() && "Non-build_vector operation should have been a scalar") ? void (0) : __assert_fail ("MRI.getType(RHS).isScalar() && \"Non-build_vector operation should have been a scalar\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4782, __extension__ __PRETTY_FUNCTION__)); | |||
| 4783 | PreShift = PreShifts[0]; | |||
| 4784 | MagicFactor = MagicFactors[0]; | |||
| 4785 | PostShift = PostShifts[0]; | |||
| 4786 | } | |||
| 4787 | ||||
| 4788 | Register Q = LHS; | |||
| 4789 | Q = MIB.buildLShr(Ty, Q, PreShift).getReg(0); | |||
| 4790 | ||||
| 4791 | // Multiply the numerator (operand 0) by the magic value. | |||
| 4792 | Q = MIB.buildUMulH(Ty, Q, MagicFactor).getReg(0); | |||
| 4793 | ||||
| 4794 | if (UseNPQ) { | |||
| 4795 | Register NPQ = MIB.buildSub(Ty, LHS, Q).getReg(0); | |||
| 4796 | ||||
| 4797 | // For vectors we might have a mix of non-NPQ/NPQ paths, so use | |||
| 4798 | // G_UMULH to act as a SRL-by-1 for NPQ, else multiply by zero. | |||
| 4799 | if (Ty.isVector()) | |||
| 4800 | NPQ = MIB.buildUMulH(Ty, NPQ, NPQFactor).getReg(0); | |||
| 4801 | else | |||
| 4802 | NPQ = MIB.buildLShr(Ty, NPQ, MIB.buildConstant(ShiftAmtTy, 1)).getReg(0); | |||
| 4803 | ||||
| 4804 | Q = MIB.buildAdd(Ty, NPQ, Q).getReg(0); | |||
| 4805 | } | |||
| 4806 | ||||
| 4807 | Q = MIB.buildLShr(Ty, Q, PostShift).getReg(0); | |||
| 4808 | auto One = MIB.buildConstant(Ty, 1); | |||
| 4809 | auto IsOne = MIB.buildICmp( | |||
| 4810 | CmpInst::Predicate::ICMP_EQ, | |||
| 4811 | Ty.isScalar() ? LLT::scalar(1) : Ty.changeElementSize(1), RHS, One); | |||
| 4812 | return MIB.buildSelect(Ty, IsOne, LHS, Q); | |||
| 4813 | } | |||
| 4814 | ||||
| 4815 | bool CombinerHelper::matchUDivByConst(MachineInstr &MI) { | |||
| 4816 | assert(MI.getOpcode() == TargetOpcode::G_UDIV)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UDIV ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UDIV" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4816, __extension__ __PRETTY_FUNCTION__)); | |||
| 4817 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4818 | Register RHS = MI.getOperand(2).getReg(); | |||
| 4819 | LLT DstTy = MRI.getType(Dst); | |||
| 4820 | auto *RHSDef = MRI.getVRegDef(RHS); | |||
| 4821 | if (!isConstantOrConstantVector(*RHSDef, MRI)) | |||
| 4822 | return false; | |||
| 4823 | ||||
| 4824 | auto &MF = *MI.getMF(); | |||
| 4825 | AttributeList Attr = MF.getFunction().getAttributes(); | |||
| 4826 | const auto &TLI = getTargetLowering(); | |||
| 4827 | LLVMContext &Ctx = MF.getFunction().getContext(); | |||
| 4828 | auto &DL = MF.getDataLayout(); | |||
| 4829 | if (TLI.isIntDivCheap(getApproximateEVTForLLT(DstTy, DL, Ctx), Attr)) | |||
| 4830 | return false; | |||
| 4831 | ||||
| 4832 | // Don't do this for minsize because the instruction sequence is usually | |||
| 4833 | // larger. | |||
| 4834 | if (MF.getFunction().hasMinSize()) | |||
| 4835 | return false; | |||
| 4836 | ||||
| 4837 | // Don't do this if the types are not going to be legal. | |||
| 4838 | if (LI) { | |||
| 4839 | if (!isLegalOrBeforeLegalizer({TargetOpcode::G_MUL, {DstTy, DstTy}})) | |||
| 4840 | return false; | |||
| 4841 | if (!isLegalOrBeforeLegalizer({TargetOpcode::G_UMULH, {DstTy}})) | |||
| 4842 | return false; | |||
| 4843 | if (!isLegalOrBeforeLegalizer( | |||
| 4844 | {TargetOpcode::G_ICMP, | |||
| 4845 | {DstTy.isVector() ? DstTy.changeElementSize(1) : LLT::scalar(1), | |||
| 4846 | DstTy}})) | |||
| 4847 | return false; | |||
| 4848 | } | |||
| 4849 | ||||
| 4850 | auto CheckEltValue = [&](const Constant *C) { | |||
| 4851 | if (auto *CI = dyn_cast_or_null<ConstantInt>(C)) | |||
| 4852 | return !CI->isZero(); | |||
| 4853 | return false; | |||
| 4854 | }; | |||
| 4855 | return matchUnaryPredicate(MRI, RHS, CheckEltValue); | |||
| 4856 | } | |||
| 4857 | ||||
| 4858 | void CombinerHelper::applyUDivByConst(MachineInstr &MI) { | |||
| 4859 | auto *NewMI = buildUDivUsingMul(MI); | |||
| 4860 | replaceSingleDefInstWithReg(MI, NewMI->getOperand(0).getReg()); | |||
| 4861 | } | |||
| 4862 | ||||
| 4863 | bool CombinerHelper::matchSDivByConst(MachineInstr &MI) { | |||
| 4864 | assert(MI.getOpcode() == TargetOpcode::G_SDIV && "Expected SDIV")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SDIV && "Expected SDIV") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SDIV && \"Expected SDIV\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4864, __extension__ __PRETTY_FUNCTION__)); | |||
| 4865 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4866 | Register RHS = MI.getOperand(2).getReg(); | |||
| 4867 | LLT DstTy = MRI.getType(Dst); | |||
| 4868 | ||||
| 4869 | auto &MF = *MI.getMF(); | |||
| 4870 | AttributeList Attr = MF.getFunction().getAttributes(); | |||
| 4871 | const auto &TLI = getTargetLowering(); | |||
| 4872 | LLVMContext &Ctx = MF.getFunction().getContext(); | |||
| 4873 | auto &DL = MF.getDataLayout(); | |||
| 4874 | if (TLI.isIntDivCheap(getApproximateEVTForLLT(DstTy, DL, Ctx), Attr)) | |||
| 4875 | return false; | |||
| 4876 | ||||
| 4877 | // Don't do this for minsize because the instruction sequence is usually | |||
| 4878 | // larger. | |||
| 4879 | if (MF.getFunction().hasMinSize()) | |||
| 4880 | return false; | |||
| 4881 | ||||
| 4882 | // If the sdiv has an 'exact' flag we can use a simpler lowering. | |||
| 4883 | if (MI.getFlag(MachineInstr::MIFlag::IsExact)) { | |||
| 4884 | return matchUnaryPredicate( | |||
| 4885 | MRI, RHS, [](const Constant *C) { return C && !C->isZeroValue(); }); | |||
| 4886 | } | |||
| 4887 | ||||
| 4888 | // Don't support the general case for now. | |||
| 4889 | return false; | |||
| 4890 | } | |||
| 4891 | ||||
| 4892 | void CombinerHelper::applySDivByConst(MachineInstr &MI) { | |||
| 4893 | auto *NewMI = buildSDivUsingMul(MI); | |||
| 4894 | replaceSingleDefInstWithReg(MI, NewMI->getOperand(0).getReg()); | |||
| 4895 | } | |||
| 4896 | ||||
| 4897 | MachineInstr *CombinerHelper::buildSDivUsingMul(MachineInstr &MI) { | |||
| 4898 | assert(MI.getOpcode() == TargetOpcode::G_SDIV && "Expected SDIV")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SDIV && "Expected SDIV") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SDIV && \"Expected SDIV\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4898, __extension__ __PRETTY_FUNCTION__)); | |||
| 4899 | auto &SDiv = cast<GenericMachineInstr>(MI); | |||
| 4900 | Register Dst = SDiv.getReg(0); | |||
| 4901 | Register LHS = SDiv.getReg(1); | |||
| 4902 | Register RHS = SDiv.getReg(2); | |||
| 4903 | LLT Ty = MRI.getType(Dst); | |||
| 4904 | LLT ScalarTy = Ty.getScalarType(); | |||
| 4905 | LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4906 | LLT ScalarShiftAmtTy = ShiftAmtTy.getScalarType(); | |||
| 4907 | auto &MIB = Builder; | |||
| 4908 | MIB.setInstrAndDebugLoc(MI); | |||
| 4909 | ||||
| 4910 | bool UseSRA = false; | |||
| 4911 | SmallVector<Register, 16> Shifts, Factors; | |||
| 4912 | ||||
| 4913 | auto *RHSDef = cast<GenericMachineInstr>(getDefIgnoringCopies(RHS, MRI)); | |||
| 4914 | bool IsSplat = getIConstantSplatVal(*RHSDef, MRI).has_value(); | |||
| 4915 | ||||
| 4916 | auto BuildSDIVPattern = [&](const Constant *C) { | |||
| 4917 | // Don't recompute inverses for each splat element. | |||
| 4918 | if (IsSplat && !Factors.empty()) { | |||
| 4919 | Shifts.push_back(Shifts[0]); | |||
| 4920 | Factors.push_back(Factors[0]); | |||
| 4921 | return true; | |||
| 4922 | } | |||
| 4923 | ||||
| 4924 | auto *CI = cast<ConstantInt>(C); | |||
| 4925 | APInt Divisor = CI->getValue(); | |||
| 4926 | unsigned Shift = Divisor.countr_zero(); | |||
| 4927 | if (Shift) { | |||
| 4928 | Divisor.ashrInPlace(Shift); | |||
| 4929 | UseSRA = true; | |||
| 4930 | } | |||
| 4931 | ||||
| 4932 | // Calculate the multiplicative inverse modulo BW. | |||
| 4933 | // 2^W requires W + 1 bits, so we have to extend and then truncate. | |||
| 4934 | unsigned W = Divisor.getBitWidth(); | |||
| 4935 | APInt Factor = Divisor.zext(W + 1) | |||
| 4936 | .multiplicativeInverse(APInt::getSignedMinValue(W + 1)) | |||
| 4937 | .trunc(W); | |||
| 4938 | Shifts.push_back(MIB.buildConstant(ScalarShiftAmtTy, Shift).getReg(0)); | |||
| 4939 | Factors.push_back(MIB.buildConstant(ScalarTy, Factor).getReg(0)); | |||
| 4940 | return true; | |||
| 4941 | }; | |||
| 4942 | ||||
| 4943 | // Collect all magic values from the build vector. | |||
| 4944 | bool Matched = matchUnaryPredicate(MRI, RHS, BuildSDIVPattern); | |||
| 4945 | (void)Matched; | |||
| 4946 | assert(Matched && "Expected unary predicate match to succeed")(static_cast <bool> (Matched && "Expected unary predicate match to succeed" ) ? void (0) : __assert_fail ("Matched && \"Expected unary predicate match to succeed\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4946, __extension__ __PRETTY_FUNCTION__)); | |||
| 4947 | ||||
| 4948 | Register Shift, Factor; | |||
| 4949 | if (Ty.isVector()) { | |||
| 4950 | Shift = MIB.buildBuildVector(ShiftAmtTy, Shifts).getReg(0); | |||
| 4951 | Factor = MIB.buildBuildVector(Ty, Factors).getReg(0); | |||
| 4952 | } else { | |||
| 4953 | Shift = Shifts[0]; | |||
| 4954 | Factor = Factors[0]; | |||
| 4955 | } | |||
| 4956 | ||||
| 4957 | Register Res = LHS; | |||
| 4958 | ||||
| 4959 | if (UseSRA) | |||
| 4960 | Res = MIB.buildAShr(Ty, Res, Shift, MachineInstr::IsExact).getReg(0); | |||
| 4961 | ||||
| 4962 | return MIB.buildMul(Ty, Res, Factor); | |||
| 4963 | } | |||
| 4964 | ||||
| 4965 | bool CombinerHelper::matchUMulHToLShr(MachineInstr &MI) { | |||
| 4966 | assert(MI.getOpcode() == TargetOpcode::G_UMULH)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_UMULH ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_UMULH" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 4966, __extension__ __PRETTY_FUNCTION__)); | |||
| 4967 | Register RHS = MI.getOperand(2).getReg(); | |||
| 4968 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4969 | LLT Ty = MRI.getType(Dst); | |||
| 4970 | LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4971 | auto MatchPow2ExceptOne = [&](const Constant *C) { | |||
| 4972 | if (auto *CI = dyn_cast<ConstantInt>(C)) | |||
| 4973 | return CI->getValue().isPowerOf2() && !CI->getValue().isOne(); | |||
| 4974 | return false; | |||
| 4975 | }; | |||
| 4976 | if (!matchUnaryPredicate(MRI, RHS, MatchPow2ExceptOne, false)) | |||
| 4977 | return false; | |||
| 4978 | return isLegalOrBeforeLegalizer({TargetOpcode::G_LSHR, {Ty, ShiftAmtTy}}); | |||
| 4979 | } | |||
| 4980 | ||||
| 4981 | void CombinerHelper::applyUMulHToLShr(MachineInstr &MI) { | |||
| 4982 | Register LHS = MI.getOperand(1).getReg(); | |||
| 4983 | Register RHS = MI.getOperand(2).getReg(); | |||
| 4984 | Register Dst = MI.getOperand(0).getReg(); | |||
| 4985 | LLT Ty = MRI.getType(Dst); | |||
| 4986 | LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty); | |||
| 4987 | unsigned NumEltBits = Ty.getScalarSizeInBits(); | |||
| 4988 | ||||
| 4989 | Builder.setInstrAndDebugLoc(MI); | |||
| 4990 | auto LogBase2 = buildLogBase2(RHS, Builder); | |||
| 4991 | auto ShiftAmt = | |||
| 4992 | Builder.buildSub(Ty, Builder.buildConstant(Ty, NumEltBits), LogBase2); | |||
| 4993 | auto Trunc = Builder.buildZExtOrTrunc(ShiftAmtTy, ShiftAmt); | |||
| 4994 | Builder.buildLShr(Dst, LHS, Trunc); | |||
| 4995 | MI.eraseFromParent(); | |||
| 4996 | } | |||
| 4997 | ||||
| 4998 | bool CombinerHelper::matchRedundantNegOperands(MachineInstr &MI, | |||
| 4999 | BuildFnTy &MatchInfo) { | |||
| 5000 | unsigned Opc = MI.getOpcode(); | |||
| 5001 | assert(Opc == TargetOpcode::G_FADD || Opc == TargetOpcode::G_FSUB ||(static_cast <bool> (Opc == TargetOpcode::G_FADD || Opc == TargetOpcode::G_FSUB || Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV || Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA) ? void (0) : __assert_fail ("Opc == TargetOpcode::G_FADD || Opc == TargetOpcode::G_FSUB || Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV || Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5003, __extension__ __PRETTY_FUNCTION__)) | |||
| 5002 | Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV ||(static_cast <bool> (Opc == TargetOpcode::G_FADD || Opc == TargetOpcode::G_FSUB || Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV || Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA) ? void (0) : __assert_fail ("Opc == TargetOpcode::G_FADD || Opc == TargetOpcode::G_FSUB || Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV || Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5003, __extension__ __PRETTY_FUNCTION__)) | |||
| 5003 | Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA)(static_cast <bool> (Opc == TargetOpcode::G_FADD || Opc == TargetOpcode::G_FSUB || Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV || Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA) ? void (0) : __assert_fail ("Opc == TargetOpcode::G_FADD || Opc == TargetOpcode::G_FSUB || Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV || Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5003, __extension__ __PRETTY_FUNCTION__)); | |||
| 5004 | ||||
| 5005 | Register Dst = MI.getOperand(0).getReg(); | |||
| 5006 | Register X = MI.getOperand(1).getReg(); | |||
| 5007 | Register Y = MI.getOperand(2).getReg(); | |||
| 5008 | LLT Type = MRI.getType(Dst); | |||
| 5009 | ||||
| 5010 | // fold (fadd x, fneg(y)) -> (fsub x, y) | |||
| 5011 | // fold (fadd fneg(y), x) -> (fsub x, y) | |||
| 5012 | // G_ADD is commutative so both cases are checked by m_GFAdd | |||
| 5013 | if (mi_match(Dst, MRI, m_GFAdd(m_Reg(X), m_GFNeg(m_Reg(Y)))) && | |||
| 5014 | isLegalOrBeforeLegalizer({TargetOpcode::G_FSUB, {Type}})) { | |||
| 5015 | Opc = TargetOpcode::G_FSUB; | |||
| 5016 | } | |||
| 5017 | /// fold (fsub x, fneg(y)) -> (fadd x, y) | |||
| 5018 | else if (mi_match(Dst, MRI, m_GFSub(m_Reg(X), m_GFNeg(m_Reg(Y)))) && | |||
| 5019 | isLegalOrBeforeLegalizer({TargetOpcode::G_FADD, {Type}})) { | |||
| 5020 | Opc = TargetOpcode::G_FADD; | |||
| 5021 | } | |||
| 5022 | // fold (fmul fneg(x), fneg(y)) -> (fmul x, y) | |||
| 5023 | // fold (fdiv fneg(x), fneg(y)) -> (fdiv x, y) | |||
| 5024 | // fold (fmad fneg(x), fneg(y), z) -> (fmad x, y, z) | |||
| 5025 | // fold (fma fneg(x), fneg(y), z) -> (fma x, y, z) | |||
| 5026 | else if ((Opc == TargetOpcode::G_FMUL || Opc == TargetOpcode::G_FDIV || | |||
| 5027 | Opc == TargetOpcode::G_FMAD || Opc == TargetOpcode::G_FMA) && | |||
| 5028 | mi_match(X, MRI, m_GFNeg(m_Reg(X))) && | |||
| 5029 | mi_match(Y, MRI, m_GFNeg(m_Reg(Y)))) { | |||
| 5030 | // no opcode change | |||
| 5031 | } else | |||
| 5032 | return false; | |||
| 5033 | ||||
| 5034 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5035 | Observer.changingInstr(MI); | |||
| 5036 | MI.setDesc(B.getTII().get(Opc)); | |||
| 5037 | MI.getOperand(1).setReg(X); | |||
| 5038 | MI.getOperand(2).setReg(Y); | |||
| 5039 | Observer.changedInstr(MI); | |||
| 5040 | }; | |||
| 5041 | return true; | |||
| 5042 | } | |||
| 5043 | ||||
| 5044 | bool CombinerHelper::matchFsubToFneg(MachineInstr &MI, Register &MatchInfo) { | |||
| 5045 | assert(MI.getOpcode() == TargetOpcode::G_FSUB)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FSUB ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FSUB" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5045, __extension__ __PRETTY_FUNCTION__)); | |||
| 5046 | ||||
| 5047 | Register LHS = MI.getOperand(1).getReg(); | |||
| 5048 | MatchInfo = MI.getOperand(2).getReg(); | |||
| 5049 | LLT Ty = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5050 | ||||
| 5051 | const auto LHSCst = Ty.isVector() | |||
| 5052 | ? getFConstantSplat(LHS, MRI, /* allowUndef */ true) | |||
| 5053 | : getFConstantVRegValWithLookThrough(LHS, MRI); | |||
| 5054 | if (!LHSCst) | |||
| 5055 | return false; | |||
| 5056 | ||||
| 5057 | // -0.0 is always allowed | |||
| 5058 | if (LHSCst->Value.isNegZero()) | |||
| 5059 | return true; | |||
| 5060 | ||||
| 5061 | // +0.0 is only allowed if nsz is set. | |||
| 5062 | if (LHSCst->Value.isPosZero()) | |||
| 5063 | return MI.getFlag(MachineInstr::FmNsz); | |||
| 5064 | ||||
| 5065 | return false; | |||
| 5066 | } | |||
| 5067 | ||||
| 5068 | void CombinerHelper::applyFsubToFneg(MachineInstr &MI, Register &MatchInfo) { | |||
| 5069 | Builder.setInstrAndDebugLoc(MI); | |||
| 5070 | Register Dst = MI.getOperand(0).getReg(); | |||
| 5071 | Builder.buildFNeg( | |||
| 5072 | Dst, Builder.buildFCanonicalize(MRI.getType(Dst), MatchInfo).getReg(0)); | |||
| 5073 | eraseInst(MI); | |||
| 5074 | } | |||
| 5075 | ||||
| 5076 | /// Checks if \p MI is TargetOpcode::G_FMUL and contractable either | |||
| 5077 | /// due to global flags or MachineInstr flags. | |||
| 5078 | static bool isContractableFMul(MachineInstr &MI, bool AllowFusionGlobally) { | |||
| 5079 | if (MI.getOpcode() != TargetOpcode::G_FMUL) | |||
| 5080 | return false; | |||
| 5081 | return AllowFusionGlobally || MI.getFlag(MachineInstr::MIFlag::FmContract); | |||
| 5082 | } | |||
| 5083 | ||||
| 5084 | static bool hasMoreUses(const MachineInstr &MI0, const MachineInstr &MI1, | |||
| 5085 | const MachineRegisterInfo &MRI) { | |||
| 5086 | return std::distance(MRI.use_instr_nodbg_begin(MI0.getOperand(0).getReg()), | |||
| 5087 | MRI.use_instr_nodbg_end()) > | |||
| 5088 | std::distance(MRI.use_instr_nodbg_begin(MI1.getOperand(0).getReg()), | |||
| 5089 | MRI.use_instr_nodbg_end()); | |||
| 5090 | } | |||
| 5091 | ||||
| 5092 | bool CombinerHelper::canCombineFMadOrFMA(MachineInstr &MI, | |||
| 5093 | bool &AllowFusionGlobally, | |||
| 5094 | bool &HasFMAD, bool &Aggressive, | |||
| 5095 | bool CanReassociate) { | |||
| 5096 | ||||
| 5097 | auto *MF = MI.getMF(); | |||
| 5098 | const auto &TLI = *MF->getSubtarget().getTargetLowering(); | |||
| 5099 | const TargetOptions &Options = MF->getTarget().Options; | |||
| 5100 | LLT DstType = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5101 | ||||
| 5102 | if (CanReassociate && | |||
| 5103 | !(Options.UnsafeFPMath || MI.getFlag(MachineInstr::MIFlag::FmReassoc))) | |||
| 5104 | return false; | |||
| 5105 | ||||
| 5106 | // Floating-point multiply-add with intermediate rounding. | |||
| 5107 | HasFMAD = (!isPreLegalize() && TLI.isFMADLegal(MI, DstType)); | |||
| 5108 | // Floating-point multiply-add without intermediate rounding. | |||
| 5109 | bool HasFMA = TLI.isFMAFasterThanFMulAndFAdd(*MF, DstType) && | |||
| 5110 | isLegalOrBeforeLegalizer({TargetOpcode::G_FMA, {DstType}}); | |||
| 5111 | // No valid opcode, do not combine. | |||
| 5112 | if (!HasFMAD && !HasFMA) | |||
| 5113 | return false; | |||
| 5114 | ||||
| 5115 | AllowFusionGlobally = Options.AllowFPOpFusion == FPOpFusion::Fast || | |||
| 5116 | Options.UnsafeFPMath || HasFMAD; | |||
| 5117 | // If the addition is not contractable, do not combine. | |||
| 5118 | if (!AllowFusionGlobally && !MI.getFlag(MachineInstr::MIFlag::FmContract)) | |||
| 5119 | return false; | |||
| 5120 | ||||
| 5121 | Aggressive = TLI.enableAggressiveFMAFusion(DstType); | |||
| 5122 | return true; | |||
| 5123 | } | |||
| 5124 | ||||
| 5125 | bool CombinerHelper::matchCombineFAddFMulToFMadOrFMA( | |||
| 5126 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5127 | assert(MI.getOpcode() == TargetOpcode::G_FADD)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FADD ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FADD" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5127, __extension__ __PRETTY_FUNCTION__)); | |||
| 5128 | ||||
| 5129 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5130 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive)) | |||
| 5131 | return false; | |||
| 5132 | ||||
| 5133 | Register Op1 = MI.getOperand(1).getReg(); | |||
| 5134 | Register Op2 = MI.getOperand(2).getReg(); | |||
| 5135 | DefinitionAndSourceRegister LHS = {MRI.getVRegDef(Op1), Op1}; | |||
| 5136 | DefinitionAndSourceRegister RHS = {MRI.getVRegDef(Op2), Op2}; | |||
| 5137 | unsigned PreferredFusedOpcode = | |||
| 5138 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5139 | ||||
| 5140 | // If we have two choices trying to fold (fadd (fmul u, v), (fmul x, y)), | |||
| 5141 | // prefer to fold the multiply with fewer uses. | |||
| 5142 | if (Aggressive && isContractableFMul(*LHS.MI, AllowFusionGlobally) && | |||
| 5143 | isContractableFMul(*RHS.MI, AllowFusionGlobally)) { | |||
| 5144 | if (hasMoreUses(*LHS.MI, *RHS.MI, MRI)) | |||
| 5145 | std::swap(LHS, RHS); | |||
| 5146 | } | |||
| 5147 | ||||
| 5148 | // fold (fadd (fmul x, y), z) -> (fma x, y, z) | |||
| 5149 | if (isContractableFMul(*LHS.MI, AllowFusionGlobally) && | |||
| 5150 | (Aggressive || MRI.hasOneNonDBGUse(LHS.Reg))) { | |||
| 5151 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5152 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5153 | {LHS.MI->getOperand(1).getReg(), | |||
| 5154 | LHS.MI->getOperand(2).getReg(), RHS.Reg}); | |||
| 5155 | }; | |||
| 5156 | return true; | |||
| 5157 | } | |||
| 5158 | ||||
| 5159 | // fold (fadd x, (fmul y, z)) -> (fma y, z, x) | |||
| 5160 | if (isContractableFMul(*RHS.MI, AllowFusionGlobally) && | |||
| 5161 | (Aggressive || MRI.hasOneNonDBGUse(RHS.Reg))) { | |||
| 5162 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5163 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5164 | {RHS.MI->getOperand(1).getReg(), | |||
| 5165 | RHS.MI->getOperand(2).getReg(), LHS.Reg}); | |||
| 5166 | }; | |||
| 5167 | return true; | |||
| 5168 | } | |||
| 5169 | ||||
| 5170 | return false; | |||
| 5171 | } | |||
| 5172 | ||||
| 5173 | bool CombinerHelper::matchCombineFAddFpExtFMulToFMadOrFMA( | |||
| 5174 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5175 | assert(MI.getOpcode() == TargetOpcode::G_FADD)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FADD ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FADD" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5175, __extension__ __PRETTY_FUNCTION__)); | |||
| 5176 | ||||
| 5177 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5178 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive)) | |||
| 5179 | return false; | |||
| 5180 | ||||
| 5181 | const auto &TLI = *MI.getMF()->getSubtarget().getTargetLowering(); | |||
| 5182 | Register Op1 = MI.getOperand(1).getReg(); | |||
| 5183 | Register Op2 = MI.getOperand(2).getReg(); | |||
| 5184 | DefinitionAndSourceRegister LHS = {MRI.getVRegDef(Op1), Op1}; | |||
| 5185 | DefinitionAndSourceRegister RHS = {MRI.getVRegDef(Op2), Op2}; | |||
| 5186 | LLT DstType = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5187 | ||||
| 5188 | unsigned PreferredFusedOpcode = | |||
| 5189 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5190 | ||||
| 5191 | // If we have two choices trying to fold (fadd (fmul u, v), (fmul x, y)), | |||
| 5192 | // prefer to fold the multiply with fewer uses. | |||
| 5193 | if (Aggressive && isContractableFMul(*LHS.MI, AllowFusionGlobally) && | |||
| 5194 | isContractableFMul(*RHS.MI, AllowFusionGlobally)) { | |||
| 5195 | if (hasMoreUses(*LHS.MI, *RHS.MI, MRI)) | |||
| 5196 | std::swap(LHS, RHS); | |||
| 5197 | } | |||
| 5198 | ||||
| 5199 | // fold (fadd (fpext (fmul x, y)), z) -> (fma (fpext x), (fpext y), z) | |||
| 5200 | MachineInstr *FpExtSrc; | |||
| 5201 | if (mi_match(LHS.Reg, MRI, m_GFPExt(m_MInstr(FpExtSrc))) && | |||
| 5202 | isContractableFMul(*FpExtSrc, AllowFusionGlobally) && | |||
| 5203 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstType, | |||
| 5204 | MRI.getType(FpExtSrc->getOperand(1).getReg()))) { | |||
| 5205 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5206 | auto FpExtX = B.buildFPExt(DstType, FpExtSrc->getOperand(1).getReg()); | |||
| 5207 | auto FpExtY = B.buildFPExt(DstType, FpExtSrc->getOperand(2).getReg()); | |||
| 5208 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5209 | {FpExtX.getReg(0), FpExtY.getReg(0), RHS.Reg}); | |||
| 5210 | }; | |||
| 5211 | return true; | |||
| 5212 | } | |||
| 5213 | ||||
| 5214 | // fold (fadd z, (fpext (fmul x, y))) -> (fma (fpext x), (fpext y), z) | |||
| 5215 | // Note: Commutes FADD operands. | |||
| 5216 | if (mi_match(RHS.Reg, MRI, m_GFPExt(m_MInstr(FpExtSrc))) && | |||
| 5217 | isContractableFMul(*FpExtSrc, AllowFusionGlobally) && | |||
| 5218 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstType, | |||
| 5219 | MRI.getType(FpExtSrc->getOperand(1).getReg()))) { | |||
| 5220 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5221 | auto FpExtX = B.buildFPExt(DstType, FpExtSrc->getOperand(1).getReg()); | |||
| 5222 | auto FpExtY = B.buildFPExt(DstType, FpExtSrc->getOperand(2).getReg()); | |||
| 5223 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5224 | {FpExtX.getReg(0), FpExtY.getReg(0), LHS.Reg}); | |||
| 5225 | }; | |||
| 5226 | return true; | |||
| 5227 | } | |||
| 5228 | ||||
| 5229 | return false; | |||
| 5230 | } | |||
| 5231 | ||||
| 5232 | bool CombinerHelper::matchCombineFAddFMAFMulToFMadOrFMA( | |||
| 5233 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5234 | assert(MI.getOpcode() == TargetOpcode::G_FADD)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FADD ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FADD" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5234, __extension__ __PRETTY_FUNCTION__)); | |||
| 5235 | ||||
| 5236 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5237 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive, true)) | |||
| 5238 | return false; | |||
| 5239 | ||||
| 5240 | Register Op1 = MI.getOperand(1).getReg(); | |||
| 5241 | Register Op2 = MI.getOperand(2).getReg(); | |||
| 5242 | DefinitionAndSourceRegister LHS = {MRI.getVRegDef(Op1), Op1}; | |||
| 5243 | DefinitionAndSourceRegister RHS = {MRI.getVRegDef(Op2), Op2}; | |||
| 5244 | LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5245 | ||||
| 5246 | unsigned PreferredFusedOpcode = | |||
| 5247 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5248 | ||||
| 5249 | // If we have two choices trying to fold (fadd (fmul u, v), (fmul x, y)), | |||
| 5250 | // prefer to fold the multiply with fewer uses. | |||
| 5251 | if (Aggressive && isContractableFMul(*LHS.MI, AllowFusionGlobally) && | |||
| 5252 | isContractableFMul(*RHS.MI, AllowFusionGlobally)) { | |||
| 5253 | if (hasMoreUses(*LHS.MI, *RHS.MI, MRI)) | |||
| 5254 | std::swap(LHS, RHS); | |||
| 5255 | } | |||
| 5256 | ||||
| 5257 | MachineInstr *FMA = nullptr; | |||
| 5258 | Register Z; | |||
| 5259 | // fold (fadd (fma x, y, (fmul u, v)), z) -> (fma x, y, (fma u, v, z)) | |||
| 5260 | if (LHS.MI->getOpcode() == PreferredFusedOpcode && | |||
| 5261 | (MRI.getVRegDef(LHS.MI->getOperand(3).getReg())->getOpcode() == | |||
| 5262 | TargetOpcode::G_FMUL) && | |||
| 5263 | MRI.hasOneNonDBGUse(LHS.MI->getOperand(0).getReg()) && | |||
| 5264 | MRI.hasOneNonDBGUse(LHS.MI->getOperand(3).getReg())) { | |||
| 5265 | FMA = LHS.MI; | |||
| 5266 | Z = RHS.Reg; | |||
| 5267 | } | |||
| 5268 | // fold (fadd z, (fma x, y, (fmul u, v))) -> (fma x, y, (fma u, v, z)) | |||
| 5269 | else if (RHS.MI->getOpcode() == PreferredFusedOpcode && | |||
| 5270 | (MRI.getVRegDef(RHS.MI->getOperand(3).getReg())->getOpcode() == | |||
| 5271 | TargetOpcode::G_FMUL) && | |||
| 5272 | MRI.hasOneNonDBGUse(RHS.MI->getOperand(0).getReg()) && | |||
| 5273 | MRI.hasOneNonDBGUse(RHS.MI->getOperand(3).getReg())) { | |||
| 5274 | Z = LHS.Reg; | |||
| 5275 | FMA = RHS.MI; | |||
| 5276 | } | |||
| 5277 | ||||
| 5278 | if (FMA) { | |||
| 5279 | MachineInstr *FMulMI = MRI.getVRegDef(FMA->getOperand(3).getReg()); | |||
| 5280 | Register X = FMA->getOperand(1).getReg(); | |||
| 5281 | Register Y = FMA->getOperand(2).getReg(); | |||
| 5282 | Register U = FMulMI->getOperand(1).getReg(); | |||
| 5283 | Register V = FMulMI->getOperand(2).getReg(); | |||
| 5284 | ||||
| 5285 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5286 | Register InnerFMA = MRI.createGenericVirtualRegister(DstTy); | |||
| 5287 | B.buildInstr(PreferredFusedOpcode, {InnerFMA}, {U, V, Z}); | |||
| 5288 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5289 | {X, Y, InnerFMA}); | |||
| 5290 | }; | |||
| 5291 | return true; | |||
| 5292 | } | |||
| 5293 | ||||
| 5294 | return false; | |||
| 5295 | } | |||
| 5296 | ||||
| 5297 | bool CombinerHelper::matchCombineFAddFpExtFMulToFMadOrFMAAggressive( | |||
| 5298 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5299 | assert(MI.getOpcode() == TargetOpcode::G_FADD)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FADD ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FADD" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5299, __extension__ __PRETTY_FUNCTION__)); | |||
| 5300 | ||||
| 5301 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5302 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive)) | |||
| 5303 | return false; | |||
| 5304 | ||||
| 5305 | if (!Aggressive) | |||
| 5306 | return false; | |||
| 5307 | ||||
| 5308 | const auto &TLI = *MI.getMF()->getSubtarget().getTargetLowering(); | |||
| 5309 | LLT DstType = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5310 | Register Op1 = MI.getOperand(1).getReg(); | |||
| 5311 | Register Op2 = MI.getOperand(2).getReg(); | |||
| 5312 | DefinitionAndSourceRegister LHS = {MRI.getVRegDef(Op1), Op1}; | |||
| 5313 | DefinitionAndSourceRegister RHS = {MRI.getVRegDef(Op2), Op2}; | |||
| 5314 | ||||
| 5315 | unsigned PreferredFusedOpcode = | |||
| 5316 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5317 | ||||
| 5318 | // If we have two choices trying to fold (fadd (fmul u, v), (fmul x, y)), | |||
| 5319 | // prefer to fold the multiply with fewer uses. | |||
| 5320 | if (Aggressive && isContractableFMul(*LHS.MI, AllowFusionGlobally) && | |||
| 5321 | isContractableFMul(*RHS.MI, AllowFusionGlobally)) { | |||
| 5322 | if (hasMoreUses(*LHS.MI, *RHS.MI, MRI)) | |||
| 5323 | std::swap(LHS, RHS); | |||
| 5324 | } | |||
| 5325 | ||||
| 5326 | // Builds: (fma x, y, (fma (fpext u), (fpext v), z)) | |||
| 5327 | auto buildMatchInfo = [=, &MI](Register U, Register V, Register Z, Register X, | |||
| 5328 | Register Y, MachineIRBuilder &B) { | |||
| 5329 | Register FpExtU = B.buildFPExt(DstType, U).getReg(0); | |||
| 5330 | Register FpExtV = B.buildFPExt(DstType, V).getReg(0); | |||
| 5331 | Register InnerFMA = | |||
| 5332 | B.buildInstr(PreferredFusedOpcode, {DstType}, {FpExtU, FpExtV, Z}) | |||
| 5333 | .getReg(0); | |||
| 5334 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5335 | {X, Y, InnerFMA}); | |||
| 5336 | }; | |||
| 5337 | ||||
| 5338 | MachineInstr *FMulMI, *FMAMI; | |||
| 5339 | // fold (fadd (fma x, y, (fpext (fmul u, v))), z) | |||
| 5340 | // -> (fma x, y, (fma (fpext u), (fpext v), z)) | |||
| 5341 | if (LHS.MI->getOpcode() == PreferredFusedOpcode && | |||
| 5342 | mi_match(LHS.MI->getOperand(3).getReg(), MRI, | |||
| 5343 | m_GFPExt(m_MInstr(FMulMI))) && | |||
| 5344 | isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5345 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstType, | |||
| 5346 | MRI.getType(FMulMI->getOperand(0).getReg()))) { | |||
| 5347 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 5348 | buildMatchInfo(FMulMI->getOperand(1).getReg(), | |||
| 5349 | FMulMI->getOperand(2).getReg(), RHS.Reg, | |||
| 5350 | LHS.MI->getOperand(1).getReg(), | |||
| 5351 | LHS.MI->getOperand(2).getReg(), B); | |||
| 5352 | }; | |||
| 5353 | return true; | |||
| 5354 | } | |||
| 5355 | ||||
| 5356 | // fold (fadd (fpext (fma x, y, (fmul u, v))), z) | |||
| 5357 | // -> (fma (fpext x), (fpext y), (fma (fpext u), (fpext v), z)) | |||
| 5358 | // FIXME: This turns two single-precision and one double-precision | |||
| 5359 | // operation into two double-precision operations, which might not be | |||
| 5360 | // interesting for all targets, especially GPUs. | |||
| 5361 | if (mi_match(LHS.Reg, MRI, m_GFPExt(m_MInstr(FMAMI))) && | |||
| 5362 | FMAMI->getOpcode() == PreferredFusedOpcode) { | |||
| 5363 | MachineInstr *FMulMI = MRI.getVRegDef(FMAMI->getOperand(3).getReg()); | |||
| 5364 | if (isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5365 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstType, | |||
| 5366 | MRI.getType(FMAMI->getOperand(0).getReg()))) { | |||
| 5367 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 5368 | Register X = FMAMI->getOperand(1).getReg(); | |||
| 5369 | Register Y = FMAMI->getOperand(2).getReg(); | |||
| 5370 | X = B.buildFPExt(DstType, X).getReg(0); | |||
| 5371 | Y = B.buildFPExt(DstType, Y).getReg(0); | |||
| 5372 | buildMatchInfo(FMulMI->getOperand(1).getReg(), | |||
| 5373 | FMulMI->getOperand(2).getReg(), RHS.Reg, X, Y, B); | |||
| 5374 | }; | |||
| 5375 | ||||
| 5376 | return true; | |||
| 5377 | } | |||
| 5378 | } | |||
| 5379 | ||||
| 5380 | // fold (fadd z, (fma x, y, (fpext (fmul u, v))) | |||
| 5381 | // -> (fma x, y, (fma (fpext u), (fpext v), z)) | |||
| 5382 | if (RHS.MI->getOpcode() == PreferredFusedOpcode && | |||
| 5383 | mi_match(RHS.MI->getOperand(3).getReg(), MRI, | |||
| 5384 | m_GFPExt(m_MInstr(FMulMI))) && | |||
| 5385 | isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5386 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstType, | |||
| 5387 | MRI.getType(FMulMI->getOperand(0).getReg()))) { | |||
| 5388 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 5389 | buildMatchInfo(FMulMI->getOperand(1).getReg(), | |||
| 5390 | FMulMI->getOperand(2).getReg(), LHS.Reg, | |||
| 5391 | RHS.MI->getOperand(1).getReg(), | |||
| 5392 | RHS.MI->getOperand(2).getReg(), B); | |||
| 5393 | }; | |||
| 5394 | return true; | |||
| 5395 | } | |||
| 5396 | ||||
| 5397 | // fold (fadd z, (fpext (fma x, y, (fmul u, v))) | |||
| 5398 | // -> (fma (fpext x), (fpext y), (fma (fpext u), (fpext v), z)) | |||
| 5399 | // FIXME: This turns two single-precision and one double-precision | |||
| 5400 | // operation into two double-precision operations, which might not be | |||
| 5401 | // interesting for all targets, especially GPUs. | |||
| 5402 | if (mi_match(RHS.Reg, MRI, m_GFPExt(m_MInstr(FMAMI))) && | |||
| 5403 | FMAMI->getOpcode() == PreferredFusedOpcode) { | |||
| 5404 | MachineInstr *FMulMI = MRI.getVRegDef(FMAMI->getOperand(3).getReg()); | |||
| 5405 | if (isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5406 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstType, | |||
| 5407 | MRI.getType(FMAMI->getOperand(0).getReg()))) { | |||
| 5408 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 5409 | Register X = FMAMI->getOperand(1).getReg(); | |||
| 5410 | Register Y = FMAMI->getOperand(2).getReg(); | |||
| 5411 | X = B.buildFPExt(DstType, X).getReg(0); | |||
| 5412 | Y = B.buildFPExt(DstType, Y).getReg(0); | |||
| 5413 | buildMatchInfo(FMulMI->getOperand(1).getReg(), | |||
| 5414 | FMulMI->getOperand(2).getReg(), LHS.Reg, X, Y, B); | |||
| 5415 | }; | |||
| 5416 | return true; | |||
| 5417 | } | |||
| 5418 | } | |||
| 5419 | ||||
| 5420 | return false; | |||
| 5421 | } | |||
| 5422 | ||||
| 5423 | bool CombinerHelper::matchCombineFSubFMulToFMadOrFMA( | |||
| 5424 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5425 | assert(MI.getOpcode() == TargetOpcode::G_FSUB)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FSUB ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FSUB" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5425, __extension__ __PRETTY_FUNCTION__)); | |||
| 5426 | ||||
| 5427 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5428 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive)) | |||
| 5429 | return false; | |||
| 5430 | ||||
| 5431 | Register Op1 = MI.getOperand(1).getReg(); | |||
| 5432 | Register Op2 = MI.getOperand(2).getReg(); | |||
| 5433 | DefinitionAndSourceRegister LHS = {MRI.getVRegDef(Op1), Op1}; | |||
| 5434 | DefinitionAndSourceRegister RHS = {MRI.getVRegDef(Op2), Op2}; | |||
| 5435 | LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5436 | ||||
| 5437 | // If we have two choices trying to fold (fadd (fmul u, v), (fmul x, y)), | |||
| 5438 | // prefer to fold the multiply with fewer uses. | |||
| 5439 | int FirstMulHasFewerUses = true; | |||
| 5440 | if (isContractableFMul(*LHS.MI, AllowFusionGlobally) && | |||
| 5441 | isContractableFMul(*RHS.MI, AllowFusionGlobally) && | |||
| 5442 | hasMoreUses(*LHS.MI, *RHS.MI, MRI)) | |||
| 5443 | FirstMulHasFewerUses = false; | |||
| 5444 | ||||
| 5445 | unsigned PreferredFusedOpcode = | |||
| 5446 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5447 | ||||
| 5448 | // fold (fsub (fmul x, y), z) -> (fma x, y, -z) | |||
| 5449 | if (FirstMulHasFewerUses && | |||
| 5450 | (isContractableFMul(*LHS.MI, AllowFusionGlobally) && | |||
| 5451 | (Aggressive || MRI.hasOneNonDBGUse(LHS.Reg)))) { | |||
| 5452 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5453 | Register NegZ = B.buildFNeg(DstTy, RHS.Reg).getReg(0); | |||
| 5454 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5455 | {LHS.MI->getOperand(1).getReg(), | |||
| 5456 | LHS.MI->getOperand(2).getReg(), NegZ}); | |||
| 5457 | }; | |||
| 5458 | return true; | |||
| 5459 | } | |||
| 5460 | // fold (fsub x, (fmul y, z)) -> (fma -y, z, x) | |||
| 5461 | else if ((isContractableFMul(*RHS.MI, AllowFusionGlobally) && | |||
| 5462 | (Aggressive || MRI.hasOneNonDBGUse(RHS.Reg)))) { | |||
| 5463 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5464 | Register NegY = | |||
| 5465 | B.buildFNeg(DstTy, RHS.MI->getOperand(1).getReg()).getReg(0); | |||
| 5466 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5467 | {NegY, RHS.MI->getOperand(2).getReg(), LHS.Reg}); | |||
| 5468 | }; | |||
| 5469 | return true; | |||
| 5470 | } | |||
| 5471 | ||||
| 5472 | return false; | |||
| 5473 | } | |||
| 5474 | ||||
| 5475 | bool CombinerHelper::matchCombineFSubFNegFMulToFMadOrFMA( | |||
| 5476 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5477 | assert(MI.getOpcode() == TargetOpcode::G_FSUB)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FSUB ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FSUB" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5477, __extension__ __PRETTY_FUNCTION__)); | |||
| 5478 | ||||
| 5479 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5480 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive)) | |||
| 5481 | return false; | |||
| 5482 | ||||
| 5483 | Register LHSReg = MI.getOperand(1).getReg(); | |||
| 5484 | Register RHSReg = MI.getOperand(2).getReg(); | |||
| 5485 | LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5486 | ||||
| 5487 | unsigned PreferredFusedOpcode = | |||
| 5488 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5489 | ||||
| 5490 | MachineInstr *FMulMI; | |||
| 5491 | // fold (fsub (fneg (fmul x, y)), z) -> (fma (fneg x), y, (fneg z)) | |||
| 5492 | if (mi_match(LHSReg, MRI, m_GFNeg(m_MInstr(FMulMI))) && | |||
| 5493 | (Aggressive || (MRI.hasOneNonDBGUse(LHSReg) && | |||
| 5494 | MRI.hasOneNonDBGUse(FMulMI->getOperand(0).getReg()))) && | |||
| 5495 | isContractableFMul(*FMulMI, AllowFusionGlobally)) { | |||
| 5496 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5497 | Register NegX = | |||
| 5498 | B.buildFNeg(DstTy, FMulMI->getOperand(1).getReg()).getReg(0); | |||
| 5499 | Register NegZ = B.buildFNeg(DstTy, RHSReg).getReg(0); | |||
| 5500 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5501 | {NegX, FMulMI->getOperand(2).getReg(), NegZ}); | |||
| 5502 | }; | |||
| 5503 | return true; | |||
| 5504 | } | |||
| 5505 | ||||
| 5506 | // fold (fsub x, (fneg (fmul, y, z))) -> (fma y, z, x) | |||
| 5507 | if (mi_match(RHSReg, MRI, m_GFNeg(m_MInstr(FMulMI))) && | |||
| 5508 | (Aggressive || (MRI.hasOneNonDBGUse(RHSReg) && | |||
| 5509 | MRI.hasOneNonDBGUse(FMulMI->getOperand(0).getReg()))) && | |||
| 5510 | isContractableFMul(*FMulMI, AllowFusionGlobally)) { | |||
| 5511 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5512 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5513 | {FMulMI->getOperand(1).getReg(), | |||
| 5514 | FMulMI->getOperand(2).getReg(), LHSReg}); | |||
| 5515 | }; | |||
| 5516 | return true; | |||
| 5517 | } | |||
| 5518 | ||||
| 5519 | return false; | |||
| 5520 | } | |||
| 5521 | ||||
| 5522 | bool CombinerHelper::matchCombineFSubFpExtFMulToFMadOrFMA( | |||
| 5523 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5524 | assert(MI.getOpcode() == TargetOpcode::G_FSUB)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FSUB ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FSUB" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5524, __extension__ __PRETTY_FUNCTION__)); | |||
| 5525 | ||||
| 5526 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5527 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive)) | |||
| 5528 | return false; | |||
| 5529 | ||||
| 5530 | Register LHSReg = MI.getOperand(1).getReg(); | |||
| 5531 | Register RHSReg = MI.getOperand(2).getReg(); | |||
| 5532 | LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5533 | ||||
| 5534 | unsigned PreferredFusedOpcode = | |||
| 5535 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5536 | ||||
| 5537 | MachineInstr *FMulMI; | |||
| 5538 | // fold (fsub (fpext (fmul x, y)), z) -> (fma (fpext x), (fpext y), (fneg z)) | |||
| 5539 | if (mi_match(LHSReg, MRI, m_GFPExt(m_MInstr(FMulMI))) && | |||
| 5540 | isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5541 | (Aggressive || MRI.hasOneNonDBGUse(LHSReg))) { | |||
| 5542 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5543 | Register FpExtX = | |||
| 5544 | B.buildFPExt(DstTy, FMulMI->getOperand(1).getReg()).getReg(0); | |||
| 5545 | Register FpExtY = | |||
| 5546 | B.buildFPExt(DstTy, FMulMI->getOperand(2).getReg()).getReg(0); | |||
| 5547 | Register NegZ = B.buildFNeg(DstTy, RHSReg).getReg(0); | |||
| 5548 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5549 | {FpExtX, FpExtY, NegZ}); | |||
| 5550 | }; | |||
| 5551 | return true; | |||
| 5552 | } | |||
| 5553 | ||||
| 5554 | // fold (fsub x, (fpext (fmul y, z))) -> (fma (fneg (fpext y)), (fpext z), x) | |||
| 5555 | if (mi_match(RHSReg, MRI, m_GFPExt(m_MInstr(FMulMI))) && | |||
| 5556 | isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5557 | (Aggressive || MRI.hasOneNonDBGUse(RHSReg))) { | |||
| 5558 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5559 | Register FpExtY = | |||
| 5560 | B.buildFPExt(DstTy, FMulMI->getOperand(1).getReg()).getReg(0); | |||
| 5561 | Register NegY = B.buildFNeg(DstTy, FpExtY).getReg(0); | |||
| 5562 | Register FpExtZ = | |||
| 5563 | B.buildFPExt(DstTy, FMulMI->getOperand(2).getReg()).getReg(0); | |||
| 5564 | B.buildInstr(PreferredFusedOpcode, {MI.getOperand(0).getReg()}, | |||
| 5565 | {NegY, FpExtZ, LHSReg}); | |||
| 5566 | }; | |||
| 5567 | return true; | |||
| 5568 | } | |||
| 5569 | ||||
| 5570 | return false; | |||
| 5571 | } | |||
| 5572 | ||||
| 5573 | bool CombinerHelper::matchCombineFSubFpExtFNegFMulToFMadOrFMA( | |||
| 5574 | MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) { | |||
| 5575 | assert(MI.getOpcode() == TargetOpcode::G_FSUB)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_FSUB ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_FSUB" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5575, __extension__ __PRETTY_FUNCTION__)); | |||
| 5576 | ||||
| 5577 | bool AllowFusionGlobally, HasFMAD, Aggressive; | |||
| 5578 | if (!canCombineFMadOrFMA(MI, AllowFusionGlobally, HasFMAD, Aggressive)) | |||
| 5579 | return false; | |||
| 5580 | ||||
| 5581 | const auto &TLI = *MI.getMF()->getSubtarget().getTargetLowering(); | |||
| 5582 | LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5583 | Register LHSReg = MI.getOperand(1).getReg(); | |||
| 5584 | Register RHSReg = MI.getOperand(2).getReg(); | |||
| 5585 | ||||
| 5586 | unsigned PreferredFusedOpcode = | |||
| 5587 | HasFMAD ? TargetOpcode::G_FMAD : TargetOpcode::G_FMA; | |||
| 5588 | ||||
| 5589 | auto buildMatchInfo = [=](Register Dst, Register X, Register Y, Register Z, | |||
| 5590 | MachineIRBuilder &B) { | |||
| 5591 | Register FpExtX = B.buildFPExt(DstTy, X).getReg(0); | |||
| 5592 | Register FpExtY = B.buildFPExt(DstTy, Y).getReg(0); | |||
| 5593 | B.buildInstr(PreferredFusedOpcode, {Dst}, {FpExtX, FpExtY, Z}); | |||
| 5594 | }; | |||
| 5595 | ||||
| 5596 | MachineInstr *FMulMI; | |||
| 5597 | // fold (fsub (fpext (fneg (fmul x, y))), z) -> | |||
| 5598 | // (fneg (fma (fpext x), (fpext y), z)) | |||
| 5599 | // fold (fsub (fneg (fpext (fmul x, y))), z) -> | |||
| 5600 | // (fneg (fma (fpext x), (fpext y), z)) | |||
| 5601 | if ((mi_match(LHSReg, MRI, m_GFPExt(m_GFNeg(m_MInstr(FMulMI)))) || | |||
| 5602 | mi_match(LHSReg, MRI, m_GFNeg(m_GFPExt(m_MInstr(FMulMI))))) && | |||
| 5603 | isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5604 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstTy, | |||
| 5605 | MRI.getType(FMulMI->getOperand(0).getReg()))) { | |||
| 5606 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5607 | Register FMAReg = MRI.createGenericVirtualRegister(DstTy); | |||
| 5608 | buildMatchInfo(FMAReg, FMulMI->getOperand(1).getReg(), | |||
| 5609 | FMulMI->getOperand(2).getReg(), RHSReg, B); | |||
| 5610 | B.buildFNeg(MI.getOperand(0).getReg(), FMAReg); | |||
| 5611 | }; | |||
| 5612 | return true; | |||
| 5613 | } | |||
| 5614 | ||||
| 5615 | // fold (fsub x, (fpext (fneg (fmul y, z)))) -> (fma (fpext y), (fpext z), x) | |||
| 5616 | // fold (fsub x, (fneg (fpext (fmul y, z)))) -> (fma (fpext y), (fpext z), x) | |||
| 5617 | if ((mi_match(RHSReg, MRI, m_GFPExt(m_GFNeg(m_MInstr(FMulMI)))) || | |||
| 5618 | mi_match(RHSReg, MRI, m_GFNeg(m_GFPExt(m_MInstr(FMulMI))))) && | |||
| 5619 | isContractableFMul(*FMulMI, AllowFusionGlobally) && | |||
| 5620 | TLI.isFPExtFoldable(MI, PreferredFusedOpcode, DstTy, | |||
| 5621 | MRI.getType(FMulMI->getOperand(0).getReg()))) { | |||
| 5622 | MatchInfo = [=, &MI](MachineIRBuilder &B) { | |||
| 5623 | buildMatchInfo(MI.getOperand(0).getReg(), FMulMI->getOperand(1).getReg(), | |||
| 5624 | FMulMI->getOperand(2).getReg(), LHSReg, B); | |||
| 5625 | }; | |||
| 5626 | return true; | |||
| 5627 | } | |||
| 5628 | ||||
| 5629 | return false; | |||
| 5630 | } | |||
| 5631 | ||||
| 5632 | bool CombinerHelper::matchSelectToLogical(MachineInstr &MI, | |||
| 5633 | BuildFnTy &MatchInfo) { | |||
| 5634 | GSelect &Sel = cast<GSelect>(MI); | |||
| 5635 | Register DstReg = Sel.getReg(0); | |||
| 5636 | Register Cond = Sel.getCondReg(); | |||
| 5637 | Register TrueReg = Sel.getTrueReg(); | |||
| 5638 | Register FalseReg = Sel.getFalseReg(); | |||
| 5639 | ||||
| 5640 | auto *TrueDef = getDefIgnoringCopies(TrueReg, MRI); | |||
| 5641 | auto *FalseDef = getDefIgnoringCopies(FalseReg, MRI); | |||
| 5642 | ||||
| 5643 | const LLT CondTy = MRI.getType(Cond); | |||
| 5644 | const LLT OpTy = MRI.getType(TrueReg); | |||
| 5645 | if (CondTy != OpTy || OpTy.getScalarSizeInBits() != 1) | |||
| 5646 | return false; | |||
| 5647 | ||||
| 5648 | // We have a boolean select. | |||
| 5649 | ||||
| 5650 | // select Cond, Cond, F --> or Cond, F | |||
| 5651 | // select Cond, 1, F --> or Cond, F | |||
| 5652 | auto MaybeCstTrue = isConstantOrConstantSplatVector(*TrueDef, MRI); | |||
| 5653 | if (Cond == TrueReg || (MaybeCstTrue && MaybeCstTrue->isOne())) { | |||
| 5654 | MatchInfo = [=](MachineIRBuilder &MIB) { | |||
| 5655 | MIB.buildOr(DstReg, Cond, FalseReg); | |||
| 5656 | }; | |||
| 5657 | return true; | |||
| 5658 | } | |||
| 5659 | ||||
| 5660 | // select Cond, T, Cond --> and Cond, T | |||
| 5661 | // select Cond, T, 0 --> and Cond, T | |||
| 5662 | auto MaybeCstFalse = isConstantOrConstantSplatVector(*FalseDef, MRI); | |||
| 5663 | if (Cond == FalseReg || (MaybeCstFalse && MaybeCstFalse->isZero())) { | |||
| 5664 | MatchInfo = [=](MachineIRBuilder &MIB) { | |||
| 5665 | MIB.buildAnd(DstReg, Cond, TrueReg); | |||
| 5666 | }; | |||
| 5667 | return true; | |||
| 5668 | } | |||
| 5669 | ||||
| 5670 | // select Cond, T, 1 --> or (not Cond), T | |||
| 5671 | if (MaybeCstFalse && MaybeCstFalse->isOne()) { | |||
| 5672 | MatchInfo = [=](MachineIRBuilder &MIB) { | |||
| 5673 | MIB.buildOr(DstReg, MIB.buildNot(OpTy, Cond), TrueReg); | |||
| 5674 | }; | |||
| 5675 | return true; | |||
| 5676 | } | |||
| 5677 | ||||
| 5678 | // select Cond, 0, F --> and (not Cond), F | |||
| 5679 | if (MaybeCstTrue && MaybeCstTrue->isZero()) { | |||
| 5680 | MatchInfo = [=](MachineIRBuilder &MIB) { | |||
| 5681 | MIB.buildAnd(DstReg, MIB.buildNot(OpTy, Cond), FalseReg); | |||
| 5682 | }; | |||
| 5683 | return true; | |||
| 5684 | } | |||
| 5685 | return false; | |||
| 5686 | } | |||
| 5687 | ||||
| 5688 | bool CombinerHelper::matchCombineFMinMaxNaN(MachineInstr &MI, | |||
| 5689 | unsigned &IdxToPropagate) { | |||
| 5690 | bool PropagateNaN; | |||
| 5691 | switch (MI.getOpcode()) { | |||
| 5692 | default: | |||
| 5693 | return false; | |||
| 5694 | case TargetOpcode::G_FMINNUM: | |||
| 5695 | case TargetOpcode::G_FMAXNUM: | |||
| 5696 | PropagateNaN = false; | |||
| 5697 | break; | |||
| 5698 | case TargetOpcode::G_FMINIMUM: | |||
| 5699 | case TargetOpcode::G_FMAXIMUM: | |||
| 5700 | PropagateNaN = true; | |||
| 5701 | break; | |||
| 5702 | } | |||
| 5703 | ||||
| 5704 | auto MatchNaN = [&](unsigned Idx) { | |||
| 5705 | Register MaybeNaNReg = MI.getOperand(Idx).getReg(); | |||
| 5706 | const ConstantFP *MaybeCst = getConstantFPVRegVal(MaybeNaNReg, MRI); | |||
| 5707 | if (!MaybeCst || !MaybeCst->getValueAPF().isNaN()) | |||
| 5708 | return false; | |||
| 5709 | IdxToPropagate = PropagateNaN ? Idx : (Idx == 1 ? 2 : 1); | |||
| 5710 | return true; | |||
| 5711 | }; | |||
| 5712 | ||||
| 5713 | return MatchNaN(1) || MatchNaN(2); | |||
| 5714 | } | |||
| 5715 | ||||
| 5716 | bool CombinerHelper::matchAddSubSameReg(MachineInstr &MI, Register &Src) { | |||
| 5717 | assert(MI.getOpcode() == TargetOpcode::G_ADD && "Expected a G_ADD")(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ADD && "Expected a G_ADD") ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ADD && \"Expected a G_ADD\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5717, __extension__ __PRETTY_FUNCTION__)); | |||
| 5718 | Register LHS = MI.getOperand(1).getReg(); | |||
| 5719 | Register RHS = MI.getOperand(2).getReg(); | |||
| 5720 | ||||
| 5721 | // Helper lambda to check for opportunities for | |||
| 5722 | // A + (B - A) -> B | |||
| 5723 | // (B - A) + A -> B | |||
| 5724 | auto CheckFold = [&](Register MaybeSub, Register MaybeSameReg) { | |||
| 5725 | Register Reg; | |||
| 5726 | return mi_match(MaybeSub, MRI, m_GSub(m_Reg(Src), m_Reg(Reg))) && | |||
| 5727 | Reg == MaybeSameReg; | |||
| 5728 | }; | |||
| 5729 | return CheckFold(LHS, RHS) || CheckFold(RHS, LHS); | |||
| 5730 | } | |||
| 5731 | ||||
| 5732 | bool CombinerHelper::matchBuildVectorIdentityFold(MachineInstr &MI, | |||
| 5733 | Register &MatchInfo) { | |||
| 5734 | // This combine folds the following patterns: | |||
| 5735 | // | |||
| 5736 | // G_BUILD_VECTOR_TRUNC (G_BITCAST(x), G_LSHR(G_BITCAST(x), k)) | |||
| 5737 | // G_BUILD_VECTOR(G_TRUNC(G_BITCAST(x)), G_TRUNC(G_LSHR(G_BITCAST(x), k))) | |||
| 5738 | // into | |||
| 5739 | // x | |||
| 5740 | // if | |||
| 5741 | // k == sizeof(VecEltTy)/2 | |||
| 5742 | // type(x) == type(dst) | |||
| 5743 | // | |||
| 5744 | // G_BUILD_VECTOR(G_TRUNC(G_BITCAST(x)), undef) | |||
| 5745 | // into | |||
| 5746 | // x | |||
| 5747 | // if | |||
| 5748 | // type(x) == type(dst) | |||
| 5749 | ||||
| 5750 | LLT DstVecTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5751 | LLT DstEltTy = DstVecTy.getElementType(); | |||
| 5752 | ||||
| 5753 | Register Lo, Hi; | |||
| 5754 | ||||
| 5755 | if (mi_match( | |||
| 5756 | MI, MRI, | |||
| 5757 | m_GBuildVector(m_GTrunc(m_GBitcast(m_Reg(Lo))), m_GImplicitDef()))) { | |||
| 5758 | MatchInfo = Lo; | |||
| 5759 | return MRI.getType(MatchInfo) == DstVecTy; | |||
| 5760 | } | |||
| 5761 | ||||
| 5762 | std::optional<ValueAndVReg> ShiftAmount; | |||
| 5763 | const auto LoPattern = m_GBitcast(m_Reg(Lo)); | |||
| 5764 | const auto HiPattern = m_GLShr(m_GBitcast(m_Reg(Hi)), m_GCst(ShiftAmount)); | |||
| 5765 | if (mi_match( | |||
| 5766 | MI, MRI, | |||
| 5767 | m_any_of(m_GBuildVectorTrunc(LoPattern, HiPattern), | |||
| 5768 | m_GBuildVector(m_GTrunc(LoPattern), m_GTrunc(HiPattern))))) { | |||
| 5769 | if (Lo == Hi && ShiftAmount->Value == DstEltTy.getSizeInBits()) { | |||
| 5770 | MatchInfo = Lo; | |||
| 5771 | return MRI.getType(MatchInfo) == DstVecTy; | |||
| 5772 | } | |||
| 5773 | } | |||
| 5774 | ||||
| 5775 | return false; | |||
| 5776 | } | |||
| 5777 | ||||
| 5778 | bool CombinerHelper::matchTruncBuildVectorFold(MachineInstr &MI, | |||
| 5779 | Register &MatchInfo) { | |||
| 5780 | // Replace (G_TRUNC (G_BITCAST (G_BUILD_VECTOR x, y)) with just x | |||
| 5781 | // if type(x) == type(G_TRUNC) | |||
| 5782 | if (!mi_match(MI.getOperand(1).getReg(), MRI, | |||
| 5783 | m_GBitcast(m_GBuildVector(m_Reg(MatchInfo), m_Reg())))) | |||
| 5784 | return false; | |||
| 5785 | ||||
| 5786 | return MRI.getType(MatchInfo) == MRI.getType(MI.getOperand(0).getReg()); | |||
| 5787 | } | |||
| 5788 | ||||
| 5789 | bool CombinerHelper::matchTruncLshrBuildVectorFold(MachineInstr &MI, | |||
| 5790 | Register &MatchInfo) { | |||
| 5791 | // Replace (G_TRUNC (G_LSHR (G_BITCAST (G_BUILD_VECTOR x, y)), K)) with | |||
| 5792 | // y if K == size of vector element type | |||
| 5793 | std::optional<ValueAndVReg> ShiftAmt; | |||
| 5794 | if (!mi_match(MI.getOperand(1).getReg(), MRI, | |||
| 5795 | m_GLShr(m_GBitcast(m_GBuildVector(m_Reg(), m_Reg(MatchInfo))), | |||
| 5796 | m_GCst(ShiftAmt)))) | |||
| 5797 | return false; | |||
| 5798 | ||||
| 5799 | LLT MatchTy = MRI.getType(MatchInfo); | |||
| 5800 | return ShiftAmt->Value.getZExtValue() == MatchTy.getSizeInBits() && | |||
| 5801 | MatchTy == MRI.getType(MI.getOperand(0).getReg()); | |||
| 5802 | } | |||
| 5803 | ||||
| 5804 | unsigned CombinerHelper::getFPMinMaxOpcForSelect( | |||
| 5805 | CmpInst::Predicate Pred, LLT DstTy, | |||
| 5806 | SelectPatternNaNBehaviour VsNaNRetVal) const { | |||
| 5807 | assert(VsNaNRetVal != SelectPatternNaNBehaviour::NOT_APPLICABLE &&(static_cast <bool> (VsNaNRetVal != SelectPatternNaNBehaviour ::NOT_APPLICABLE && "Expected a NaN behaviour?") ? void (0) : __assert_fail ("VsNaNRetVal != SelectPatternNaNBehaviour::NOT_APPLICABLE && \"Expected a NaN behaviour?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5808, __extension__ __PRETTY_FUNCTION__)) | |||
| 5808 | "Expected a NaN behaviour?")(static_cast <bool> (VsNaNRetVal != SelectPatternNaNBehaviour ::NOT_APPLICABLE && "Expected a NaN behaviour?") ? void (0) : __assert_fail ("VsNaNRetVal != SelectPatternNaNBehaviour::NOT_APPLICABLE && \"Expected a NaN behaviour?\"" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5808, __extension__ __PRETTY_FUNCTION__)); | |||
| 5809 | // Choose an opcode based off of legality or the behaviour when one of the | |||
| 5810 | // LHS/RHS may be NaN. | |||
| 5811 | switch (Pred) { | |||
| 5812 | default: | |||
| 5813 | return 0; | |||
| 5814 | case CmpInst::FCMP_UGT: | |||
| 5815 | case CmpInst::FCMP_UGE: | |||
| 5816 | case CmpInst::FCMP_OGT: | |||
| 5817 | case CmpInst::FCMP_OGE: | |||
| 5818 | if (VsNaNRetVal == SelectPatternNaNBehaviour::RETURNS_OTHER) | |||
| 5819 | return TargetOpcode::G_FMAXNUM; | |||
| 5820 | if (VsNaNRetVal == SelectPatternNaNBehaviour::RETURNS_NAN) | |||
| 5821 | return TargetOpcode::G_FMAXIMUM; | |||
| 5822 | if (isLegal({TargetOpcode::G_FMAXNUM, {DstTy}})) | |||
| 5823 | return TargetOpcode::G_FMAXNUM; | |||
| 5824 | if (isLegal({TargetOpcode::G_FMAXIMUM, {DstTy}})) | |||
| 5825 | return TargetOpcode::G_FMAXIMUM; | |||
| 5826 | return 0; | |||
| 5827 | case CmpInst::FCMP_ULT: | |||
| 5828 | case CmpInst::FCMP_ULE: | |||
| 5829 | case CmpInst::FCMP_OLT: | |||
| 5830 | case CmpInst::FCMP_OLE: | |||
| 5831 | if (VsNaNRetVal == SelectPatternNaNBehaviour::RETURNS_OTHER) | |||
| 5832 | return TargetOpcode::G_FMINNUM; | |||
| 5833 | if (VsNaNRetVal == SelectPatternNaNBehaviour::RETURNS_NAN) | |||
| 5834 | return TargetOpcode::G_FMINIMUM; | |||
| 5835 | if (isLegal({TargetOpcode::G_FMINNUM, {DstTy}})) | |||
| 5836 | return TargetOpcode::G_FMINNUM; | |||
| 5837 | if (!isLegal({TargetOpcode::G_FMINIMUM, {DstTy}})) | |||
| 5838 | return 0; | |||
| 5839 | return TargetOpcode::G_FMINIMUM; | |||
| 5840 | } | |||
| 5841 | } | |||
| 5842 | ||||
| 5843 | CombinerHelper::SelectPatternNaNBehaviour | |||
| 5844 | CombinerHelper::computeRetValAgainstNaN(Register LHS, Register RHS, | |||
| 5845 | bool IsOrderedComparison) const { | |||
| 5846 | bool LHSSafe = isKnownNeverNaN(LHS, MRI); | |||
| 5847 | bool RHSSafe = isKnownNeverNaN(RHS, MRI); | |||
| 5848 | // Completely unsafe. | |||
| 5849 | if (!LHSSafe && !RHSSafe) | |||
| 5850 | return SelectPatternNaNBehaviour::NOT_APPLICABLE; | |||
| 5851 | if (LHSSafe && RHSSafe) | |||
| 5852 | return SelectPatternNaNBehaviour::RETURNS_ANY; | |||
| 5853 | // An ordered comparison will return false when given a NaN, so it | |||
| 5854 | // returns the RHS. | |||
| 5855 | if (IsOrderedComparison) | |||
| 5856 | return LHSSafe ? SelectPatternNaNBehaviour::RETURNS_NAN | |||
| 5857 | : SelectPatternNaNBehaviour::RETURNS_OTHER; | |||
| 5858 | // An unordered comparison will return true when given a NaN, so it | |||
| 5859 | // returns the LHS. | |||
| 5860 | return LHSSafe ? SelectPatternNaNBehaviour::RETURNS_OTHER | |||
| 5861 | : SelectPatternNaNBehaviour::RETURNS_NAN; | |||
| 5862 | } | |||
| 5863 | ||||
| 5864 | bool CombinerHelper::matchFPSelectToMinMax(Register Dst, Register Cond, | |||
| 5865 | Register TrueVal, Register FalseVal, | |||
| 5866 | BuildFnTy &MatchInfo) { | |||
| 5867 | // Match: select (fcmp cond x, y) x, y | |||
| 5868 | // select (fcmp cond x, y) y, x | |||
| 5869 | // And turn it into fminnum/fmaxnum or fmin/fmax based off of the condition. | |||
| 5870 | LLT DstTy = MRI.getType(Dst); | |||
| 5871 | // Bail out early on pointers, since we'll never want to fold to a min/max. | |||
| 5872 | if (DstTy.isPointer()) | |||
| 5873 | return false; | |||
| 5874 | // Match a floating point compare with a less-than/greater-than predicate. | |||
| 5875 | // TODO: Allow multiple users of the compare if they are all selects. | |||
| 5876 | CmpInst::Predicate Pred; | |||
| 5877 | Register CmpLHS, CmpRHS; | |||
| 5878 | if (!mi_match(Cond, MRI, | |||
| 5879 | m_OneNonDBGUse( | |||
| 5880 | m_GFCmp(m_Pred(Pred), m_Reg(CmpLHS), m_Reg(CmpRHS)))) || | |||
| 5881 | CmpInst::isEquality(Pred)) | |||
| 5882 | return false; | |||
| 5883 | SelectPatternNaNBehaviour ResWithKnownNaNInfo = | |||
| 5884 | computeRetValAgainstNaN(CmpLHS, CmpRHS, CmpInst::isOrdered(Pred)); | |||
| 5885 | if (ResWithKnownNaNInfo == SelectPatternNaNBehaviour::NOT_APPLICABLE) | |||
| 5886 | return false; | |||
| 5887 | if (TrueVal == CmpRHS && FalseVal == CmpLHS) { | |||
| 5888 | std::swap(CmpLHS, CmpRHS); | |||
| 5889 | Pred = CmpInst::getSwappedPredicate(Pred); | |||
| 5890 | if (ResWithKnownNaNInfo == SelectPatternNaNBehaviour::RETURNS_NAN) | |||
| 5891 | ResWithKnownNaNInfo = SelectPatternNaNBehaviour::RETURNS_OTHER; | |||
| 5892 | else if (ResWithKnownNaNInfo == SelectPatternNaNBehaviour::RETURNS_OTHER) | |||
| 5893 | ResWithKnownNaNInfo = SelectPatternNaNBehaviour::RETURNS_NAN; | |||
| 5894 | } | |||
| 5895 | if (TrueVal != CmpLHS || FalseVal != CmpRHS) | |||
| 5896 | return false; | |||
| 5897 | // Decide what type of max/min this should be based off of the predicate. | |||
| 5898 | unsigned Opc = getFPMinMaxOpcForSelect(Pred, DstTy, ResWithKnownNaNInfo); | |||
| 5899 | if (!Opc || !isLegal({Opc, {DstTy}})) | |||
| 5900 | return false; | |||
| 5901 | // Comparisons between signed zero and zero may have different results... | |||
| 5902 | // unless we have fmaximum/fminimum. In that case, we know -0 < 0. | |||
| 5903 | if (Opc != TargetOpcode::G_FMAXIMUM && Opc != TargetOpcode::G_FMINIMUM) { | |||
| 5904 | // We don't know if a comparison between two 0s will give us a consistent | |||
| 5905 | // result. Be conservative and only proceed if at least one side is | |||
| 5906 | // non-zero. | |||
| 5907 | auto KnownNonZeroSide = getFConstantVRegValWithLookThrough(CmpLHS, MRI); | |||
| 5908 | if (!KnownNonZeroSide || !KnownNonZeroSide->Value.isNonZero()) { | |||
| 5909 | KnownNonZeroSide = getFConstantVRegValWithLookThrough(CmpRHS, MRI); | |||
| 5910 | if (!KnownNonZeroSide || !KnownNonZeroSide->Value.isNonZero()) | |||
| 5911 | return false; | |||
| 5912 | } | |||
| 5913 | } | |||
| 5914 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 5915 | B.buildInstr(Opc, {Dst}, {CmpLHS, CmpRHS}); | |||
| 5916 | }; | |||
| 5917 | return true; | |||
| 5918 | } | |||
| 5919 | ||||
| 5920 | bool CombinerHelper::matchSimplifySelectToMinMax(MachineInstr &MI, | |||
| 5921 | BuildFnTy &MatchInfo) { | |||
| 5922 | // TODO: Handle integer cases. | |||
| 5923 | assert(MI.getOpcode() == TargetOpcode::G_SELECT)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_SELECT ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_SELECT" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5923, __extension__ __PRETTY_FUNCTION__)); | |||
| 5924 | // Condition may be fed by a truncated compare. | |||
| 5925 | Register Cond = MI.getOperand(1).getReg(); | |||
| 5926 | Register MaybeTrunc; | |||
| 5927 | if (mi_match(Cond, MRI, m_OneNonDBGUse(m_GTrunc(m_Reg(MaybeTrunc))))) | |||
| 5928 | Cond = MaybeTrunc; | |||
| 5929 | Register Dst = MI.getOperand(0).getReg(); | |||
| 5930 | Register TrueVal = MI.getOperand(2).getReg(); | |||
| 5931 | Register FalseVal = MI.getOperand(3).getReg(); | |||
| 5932 | return matchFPSelectToMinMax(Dst, Cond, TrueVal, FalseVal, MatchInfo); | |||
| 5933 | } | |||
| 5934 | ||||
| 5935 | bool CombinerHelper::matchRedundantBinOpInEquality(MachineInstr &MI, | |||
| 5936 | BuildFnTy &MatchInfo) { | |||
| 5937 | assert(MI.getOpcode() == TargetOpcode::G_ICMP)(static_cast <bool> (MI.getOpcode() == TargetOpcode::G_ICMP ) ? void (0) : __assert_fail ("MI.getOpcode() == TargetOpcode::G_ICMP" , "llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp", 5937, __extension__ __PRETTY_FUNCTION__)); | |||
| 5938 | // (X + Y) == X --> Y == 0 | |||
| 5939 | // (X + Y) != X --> Y != 0 | |||
| 5940 | // (X - Y) == X --> Y == 0 | |||
| 5941 | // (X - Y) != X --> Y != 0 | |||
| 5942 | // (X ^ Y) == X --> Y == 0 | |||
| 5943 | // (X ^ Y) != X --> Y != 0 | |||
| 5944 | Register Dst = MI.getOperand(0).getReg(); | |||
| 5945 | CmpInst::Predicate Pred; | |||
| 5946 | Register X, Y, OpLHS, OpRHS; | |||
| 5947 | bool MatchedSub = mi_match( | |||
| 5948 | Dst, MRI, | |||
| 5949 | m_c_GICmp(m_Pred(Pred), m_Reg(X), m_GSub(m_Reg(OpLHS), m_Reg(Y)))); | |||
| 5950 | if (MatchedSub && X != OpLHS) | |||
| 5951 | return false; | |||
| 5952 | if (!MatchedSub) { | |||
| 5953 | if (!mi_match(Dst, MRI, | |||
| 5954 | m_c_GICmp(m_Pred(Pred), m_Reg(X), | |||
| 5955 | m_any_of(m_GAdd(m_Reg(OpLHS), m_Reg(OpRHS)), | |||
| 5956 | m_GXor(m_Reg(OpLHS), m_Reg(OpRHS)))))) | |||
| 5957 | return false; | |||
| 5958 | Y = X == OpLHS ? OpRHS : X == OpRHS ? OpLHS : Register(); | |||
| 5959 | } | |||
| 5960 | MatchInfo = [=](MachineIRBuilder &B) { | |||
| 5961 | auto Zero = B.buildConstant(MRI.getType(Y), 0); | |||
| 5962 | B.buildICmp(Pred, Dst, Y, Zero); | |||
| 5963 | }; | |||
| 5964 | return CmpInst::isEquality(Pred) && Y.isValid(); | |||
| 5965 | } | |||
| 5966 | ||||
| 5967 | bool CombinerHelper::matchShiftsTooBig(MachineInstr &MI) { | |||
| 5968 | Register ShiftReg = MI.getOperand(2).getReg(); | |||
| 5969 | LLT ResTy = MRI.getType(MI.getOperand(0).getReg()); | |||
| 5970 | auto IsShiftTooBig = [&](const Constant *C) { | |||
| 5971 | auto *CI = dyn_cast<ConstantInt>(C); | |||
| 5972 | return CI && CI->uge(ResTy.getScalarSizeInBits()); | |||
| 5973 | }; | |||
| 5974 | return matchUnaryPredicate(MRI, ShiftReg, IsShiftTooBig); | |||
| 5975 | } | |||
| 5976 | ||||
| 5977 | bool CombinerHelper::tryCombine(MachineInstr &MI) { | |||
| 5978 | if (tryCombineCopy(MI)) | |||
| 5979 | return true; | |||
| 5980 | if (tryCombineExtendingLoads(MI)) | |||
| 5981 | return true; | |||
| 5982 | if (tryCombineIndexedLoadStore(MI)) | |||
| 5983 | return true; | |||
| 5984 | return false; | |||
| 5985 | } |