| File: | lib/CodeGen/MachineInstr.cpp |
| Warning: | line 1760, column 7 Value stored to 'HaveSemi' is never read |
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| 1 | //===- lib/CodeGen/MachineInstr.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 | // |
| 9 | // Methods common to all machine instructions. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "llvm/CodeGen/MachineInstr.h" |
| 14 | #include "llvm/ADT/APFloat.h" |
| 15 | #include "llvm/ADT/ArrayRef.h" |
| 16 | #include "llvm/ADT/FoldingSet.h" |
| 17 | #include "llvm/ADT/Hashing.h" |
| 18 | #include "llvm/ADT/None.h" |
| 19 | #include "llvm/ADT/STLExtras.h" |
| 20 | #include "llvm/ADT/SmallBitVector.h" |
| 21 | #include "llvm/ADT/SmallString.h" |
| 22 | #include "llvm/ADT/SmallVector.h" |
| 23 | #include "llvm/Analysis/AliasAnalysis.h" |
| 24 | #include "llvm/Analysis/Loads.h" |
| 25 | #include "llvm/Analysis/MemoryLocation.h" |
| 26 | #include "llvm/CodeGen/GlobalISel/RegisterBank.h" |
| 27 | #include "llvm/CodeGen/MachineBasicBlock.h" |
| 28 | #include "llvm/CodeGen/MachineFrameInfo.h" |
| 29 | #include "llvm/CodeGen/MachineFunction.h" |
| 30 | #include "llvm/CodeGen/MachineInstrBuilder.h" |
| 31 | #include "llvm/CodeGen/MachineInstrBundle.h" |
| 32 | #include "llvm/CodeGen/MachineMemOperand.h" |
| 33 | #include "llvm/CodeGen/MachineModuleInfo.h" |
| 34 | #include "llvm/CodeGen/MachineOperand.h" |
| 35 | #include "llvm/CodeGen/MachineRegisterInfo.h" |
| 36 | #include "llvm/CodeGen/PseudoSourceValue.h" |
| 37 | #include "llvm/CodeGen/TargetInstrInfo.h" |
| 38 | #include "llvm/CodeGen/TargetRegisterInfo.h" |
| 39 | #include "llvm/CodeGen/TargetSubtargetInfo.h" |
| 40 | #include "llvm/Config/llvm-config.h" |
| 41 | #include "llvm/IR/Constants.h" |
| 42 | #include "llvm/IR/DebugInfoMetadata.h" |
| 43 | #include "llvm/IR/DebugLoc.h" |
| 44 | #include "llvm/IR/DerivedTypes.h" |
| 45 | #include "llvm/IR/Function.h" |
| 46 | #include "llvm/IR/InlineAsm.h" |
| 47 | #include "llvm/IR/InstrTypes.h" |
| 48 | #include "llvm/IR/Intrinsics.h" |
| 49 | #include "llvm/IR/LLVMContext.h" |
| 50 | #include "llvm/IR/Metadata.h" |
| 51 | #include "llvm/IR/Module.h" |
| 52 | #include "llvm/IR/ModuleSlotTracker.h" |
| 53 | #include "llvm/IR/Operator.h" |
| 54 | #include "llvm/IR/Type.h" |
| 55 | #include "llvm/IR/Value.h" |
| 56 | #include "llvm/MC/MCInstrDesc.h" |
| 57 | #include "llvm/MC/MCRegisterInfo.h" |
| 58 | #include "llvm/MC/MCSymbol.h" |
| 59 | #include "llvm/Support/Casting.h" |
| 60 | #include "llvm/Support/CommandLine.h" |
| 61 | #include "llvm/Support/Compiler.h" |
| 62 | #include "llvm/Support/Debug.h" |
| 63 | #include "llvm/Support/ErrorHandling.h" |
| 64 | #include "llvm/Support/LowLevelTypeImpl.h" |
| 65 | #include "llvm/Support/MathExtras.h" |
| 66 | #include "llvm/Support/raw_ostream.h" |
| 67 | #include "llvm/Target/TargetIntrinsicInfo.h" |
| 68 | #include "llvm/Target/TargetMachine.h" |
| 69 | #include <algorithm> |
| 70 | #include <cassert> |
| 71 | #include <cstddef> |
| 72 | #include <cstdint> |
| 73 | #include <cstring> |
| 74 | #include <iterator> |
| 75 | #include <utility> |
| 76 | |
| 77 | using namespace llvm; |
| 78 | |
| 79 | static const MachineFunction *getMFIfAvailable(const MachineInstr &MI) { |
| 80 | if (const MachineBasicBlock *MBB = MI.getParent()) |
| 81 | if (const MachineFunction *MF = MBB->getParent()) |
| 82 | return MF; |
| 83 | return nullptr; |
| 84 | } |
| 85 | |
| 86 | // Try to crawl up to the machine function and get TRI and IntrinsicInfo from |
| 87 | // it. |
| 88 | static void tryToGetTargetInfo(const MachineInstr &MI, |
| 89 | const TargetRegisterInfo *&TRI, |
| 90 | const MachineRegisterInfo *&MRI, |
| 91 | const TargetIntrinsicInfo *&IntrinsicInfo, |
| 92 | const TargetInstrInfo *&TII) { |
| 93 | |
| 94 | if (const MachineFunction *MF = getMFIfAvailable(MI)) { |
| 95 | TRI = MF->getSubtarget().getRegisterInfo(); |
| 96 | MRI = &MF->getRegInfo(); |
| 97 | IntrinsicInfo = MF->getTarget().getIntrinsicInfo(); |
| 98 | TII = MF->getSubtarget().getInstrInfo(); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | void MachineInstr::addImplicitDefUseOperands(MachineFunction &MF) { |
| 103 | if (MCID->ImplicitDefs) |
| 104 | for (const MCPhysReg *ImpDefs = MCID->getImplicitDefs(); *ImpDefs; |
| 105 | ++ImpDefs) |
| 106 | addOperand(MF, MachineOperand::CreateReg(*ImpDefs, true, true)); |
| 107 | if (MCID->ImplicitUses) |
| 108 | for (const MCPhysReg *ImpUses = MCID->getImplicitUses(); *ImpUses; |
| 109 | ++ImpUses) |
| 110 | addOperand(MF, MachineOperand::CreateReg(*ImpUses, false, true)); |
| 111 | } |
| 112 | |
| 113 | /// MachineInstr ctor - This constructor creates a MachineInstr and adds the |
| 114 | /// implicit operands. It reserves space for the number of operands specified by |
| 115 | /// the MCInstrDesc. |
| 116 | MachineInstr::MachineInstr(MachineFunction &MF, const MCInstrDesc &tid, |
| 117 | DebugLoc dl, bool NoImp) |
| 118 | : MCID(&tid), debugLoc(std::move(dl)) { |
| 119 | assert(debugLoc.hasTrivialDestructor() && "Expected trivial destructor")((debugLoc.hasTrivialDestructor() && "Expected trivial destructor" ) ? static_cast<void> (0) : __assert_fail ("debugLoc.hasTrivialDestructor() && \"Expected trivial destructor\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 119, __PRETTY_FUNCTION__)); |
| 120 | |
| 121 | // Reserve space for the expected number of operands. |
| 122 | if (unsigned NumOps = MCID->getNumOperands() + |
| 123 | MCID->getNumImplicitDefs() + MCID->getNumImplicitUses()) { |
| 124 | CapOperands = OperandCapacity::get(NumOps); |
| 125 | Operands = MF.allocateOperandArray(CapOperands); |
| 126 | } |
| 127 | |
| 128 | if (!NoImp) |
| 129 | addImplicitDefUseOperands(MF); |
| 130 | } |
| 131 | |
| 132 | /// MachineInstr ctor - Copies MachineInstr arg exactly |
| 133 | /// |
| 134 | MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI) |
| 135 | : MCID(&MI.getDesc()), Info(MI.Info), debugLoc(MI.getDebugLoc()) { |
| 136 | assert(debugLoc.hasTrivialDestructor() && "Expected trivial destructor")((debugLoc.hasTrivialDestructor() && "Expected trivial destructor" ) ? static_cast<void> (0) : __assert_fail ("debugLoc.hasTrivialDestructor() && \"Expected trivial destructor\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 136, __PRETTY_FUNCTION__)); |
| 137 | |
| 138 | CapOperands = OperandCapacity::get(MI.getNumOperands()); |
| 139 | Operands = MF.allocateOperandArray(CapOperands); |
| 140 | |
| 141 | // Copy operands. |
| 142 | for (const MachineOperand &MO : MI.operands()) |
| 143 | addOperand(MF, MO); |
| 144 | |
| 145 | // Copy all the sensible flags. |
| 146 | setFlags(MI.Flags); |
| 147 | } |
| 148 | |
| 149 | /// getRegInfo - If this instruction is embedded into a MachineFunction, |
| 150 | /// return the MachineRegisterInfo object for the current function, otherwise |
| 151 | /// return null. |
| 152 | MachineRegisterInfo *MachineInstr::getRegInfo() { |
| 153 | if (MachineBasicBlock *MBB = getParent()) |
| 154 | return &MBB->getParent()->getRegInfo(); |
| 155 | return nullptr; |
| 156 | } |
| 157 | |
| 158 | /// RemoveRegOperandsFromUseLists - Unlink all of the register operands in |
| 159 | /// this instruction from their respective use lists. This requires that the |
| 160 | /// operands already be on their use lists. |
| 161 | void MachineInstr::RemoveRegOperandsFromUseLists(MachineRegisterInfo &MRI) { |
| 162 | for (MachineOperand &MO : operands()) |
| 163 | if (MO.isReg()) |
| 164 | MRI.removeRegOperandFromUseList(&MO); |
| 165 | } |
| 166 | |
| 167 | /// AddRegOperandsToUseLists - Add all of the register operands in |
| 168 | /// this instruction from their respective use lists. This requires that the |
| 169 | /// operands not be on their use lists yet. |
| 170 | void MachineInstr::AddRegOperandsToUseLists(MachineRegisterInfo &MRI) { |
| 171 | for (MachineOperand &MO : operands()) |
| 172 | if (MO.isReg()) |
| 173 | MRI.addRegOperandToUseList(&MO); |
| 174 | } |
| 175 | |
| 176 | void MachineInstr::addOperand(const MachineOperand &Op) { |
| 177 | MachineBasicBlock *MBB = getParent(); |
| 178 | assert(MBB && "Use MachineInstrBuilder to add operands to dangling instrs")((MBB && "Use MachineInstrBuilder to add operands to dangling instrs" ) ? static_cast<void> (0) : __assert_fail ("MBB && \"Use MachineInstrBuilder to add operands to dangling instrs\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 178, __PRETTY_FUNCTION__)); |
| 179 | MachineFunction *MF = MBB->getParent(); |
| 180 | assert(MF && "Use MachineInstrBuilder to add operands to dangling instrs")((MF && "Use MachineInstrBuilder to add operands to dangling instrs" ) ? static_cast<void> (0) : __assert_fail ("MF && \"Use MachineInstrBuilder to add operands to dangling instrs\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 180, __PRETTY_FUNCTION__)); |
| 181 | addOperand(*MF, Op); |
| 182 | } |
| 183 | |
| 184 | /// Move NumOps MachineOperands from Src to Dst, with support for overlapping |
| 185 | /// ranges. If MRI is non-null also update use-def chains. |
| 186 | static void moveOperands(MachineOperand *Dst, MachineOperand *Src, |
| 187 | unsigned NumOps, MachineRegisterInfo *MRI) { |
| 188 | if (MRI) |
| 189 | return MRI->moveOperands(Dst, Src, NumOps); |
| 190 | |
| 191 | // MachineOperand is a trivially copyable type so we can just use memmove. |
| 192 | std::memmove(Dst, Src, NumOps * sizeof(MachineOperand)); |
| 193 | } |
| 194 | |
| 195 | /// addOperand - Add the specified operand to the instruction. If it is an |
| 196 | /// implicit operand, it is added to the end of the operand list. If it is |
| 197 | /// an explicit operand it is added at the end of the explicit operand list |
| 198 | /// (before the first implicit operand). |
| 199 | void MachineInstr::addOperand(MachineFunction &MF, const MachineOperand &Op) { |
| 200 | assert(MCID && "Cannot add operands before providing an instr descriptor")((MCID && "Cannot add operands before providing an instr descriptor" ) ? static_cast<void> (0) : __assert_fail ("MCID && \"Cannot add operands before providing an instr descriptor\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 200, __PRETTY_FUNCTION__)); |
| 201 | |
| 202 | // Check if we're adding one of our existing operands. |
| 203 | if (&Op >= Operands && &Op < Operands + NumOperands) { |
| 204 | // This is unusual: MI->addOperand(MI->getOperand(i)). |
| 205 | // If adding Op requires reallocating or moving existing operands around, |
| 206 | // the Op reference could go stale. Support it by copying Op. |
| 207 | MachineOperand CopyOp(Op); |
| 208 | return addOperand(MF, CopyOp); |
| 209 | } |
| 210 | |
| 211 | // Find the insert location for the new operand. Implicit registers go at |
| 212 | // the end, everything else goes before the implicit regs. |
| 213 | // |
| 214 | // FIXME: Allow mixed explicit and implicit operands on inline asm. |
| 215 | // InstrEmitter::EmitSpecialNode() is marking inline asm clobbers as |
| 216 | // implicit-defs, but they must not be moved around. See the FIXME in |
| 217 | // InstrEmitter.cpp. |
| 218 | unsigned OpNo = getNumOperands(); |
| 219 | bool isImpReg = Op.isReg() && Op.isImplicit(); |
| 220 | if (!isImpReg && !isInlineAsm()) { |
| 221 | while (OpNo && Operands[OpNo-1].isReg() && Operands[OpNo-1].isImplicit()) { |
| 222 | --OpNo; |
| 223 | assert(!Operands[OpNo].isTied() && "Cannot move tied operands")((!Operands[OpNo].isTied() && "Cannot move tied operands" ) ? static_cast<void> (0) : __assert_fail ("!Operands[OpNo].isTied() && \"Cannot move tied operands\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 223, __PRETTY_FUNCTION__)); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | #ifndef NDEBUG |
| 228 | bool isDebugOp = Op.getType() == MachineOperand::MO_Metadata || |
| 229 | Op.getType() == MachineOperand::MO_MCSymbol; |
| 230 | // OpNo now points as the desired insertion point. Unless this is a variadic |
| 231 | // instruction, only implicit regs are allowed beyond MCID->getNumOperands(). |
| 232 | // RegMask operands go between the explicit and implicit operands. |
| 233 | assert((isImpReg || Op.isRegMask() || MCID->isVariadic() ||(((isImpReg || Op.isRegMask() || MCID->isVariadic() || OpNo < MCID->getNumOperands() || isDebugOp) && "Trying to add an operand to a machine instr that is already done!" ) ? static_cast<void> (0) : __assert_fail ("(isImpReg || Op.isRegMask() || MCID->isVariadic() || OpNo < MCID->getNumOperands() || isDebugOp) && \"Trying to add an operand to a machine instr that is already done!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 235, __PRETTY_FUNCTION__)) |
| 234 | OpNo < MCID->getNumOperands() || isDebugOp) &&(((isImpReg || Op.isRegMask() || MCID->isVariadic() || OpNo < MCID->getNumOperands() || isDebugOp) && "Trying to add an operand to a machine instr that is already done!" ) ? static_cast<void> (0) : __assert_fail ("(isImpReg || Op.isRegMask() || MCID->isVariadic() || OpNo < MCID->getNumOperands() || isDebugOp) && \"Trying to add an operand to a machine instr that is already done!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 235, __PRETTY_FUNCTION__)) |
| 235 | "Trying to add an operand to a machine instr that is already done!")(((isImpReg || Op.isRegMask() || MCID->isVariadic() || OpNo < MCID->getNumOperands() || isDebugOp) && "Trying to add an operand to a machine instr that is already done!" ) ? static_cast<void> (0) : __assert_fail ("(isImpReg || Op.isRegMask() || MCID->isVariadic() || OpNo < MCID->getNumOperands() || isDebugOp) && \"Trying to add an operand to a machine instr that is already done!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 235, __PRETTY_FUNCTION__)); |
| 236 | #endif |
| 237 | |
| 238 | MachineRegisterInfo *MRI = getRegInfo(); |
| 239 | |
| 240 | // Determine if the Operands array needs to be reallocated. |
| 241 | // Save the old capacity and operand array. |
| 242 | OperandCapacity OldCap = CapOperands; |
| 243 | MachineOperand *OldOperands = Operands; |
| 244 | if (!OldOperands || OldCap.getSize() == getNumOperands()) { |
| 245 | CapOperands = OldOperands ? OldCap.getNext() : OldCap.get(1); |
| 246 | Operands = MF.allocateOperandArray(CapOperands); |
| 247 | // Move the operands before the insertion point. |
| 248 | if (OpNo) |
| 249 | moveOperands(Operands, OldOperands, OpNo, MRI); |
| 250 | } |
| 251 | |
| 252 | // Move the operands following the insertion point. |
| 253 | if (OpNo != NumOperands) |
| 254 | moveOperands(Operands + OpNo + 1, OldOperands + OpNo, NumOperands - OpNo, |
| 255 | MRI); |
| 256 | ++NumOperands; |
| 257 | |
| 258 | // Deallocate the old operand array. |
| 259 | if (OldOperands != Operands && OldOperands) |
| 260 | MF.deallocateOperandArray(OldCap, OldOperands); |
| 261 | |
| 262 | // Copy Op into place. It still needs to be inserted into the MRI use lists. |
| 263 | MachineOperand *NewMO = new (Operands + OpNo) MachineOperand(Op); |
| 264 | NewMO->ParentMI = this; |
| 265 | |
| 266 | // When adding a register operand, tell MRI about it. |
| 267 | if (NewMO->isReg()) { |
| 268 | // Ensure isOnRegUseList() returns false, regardless of Op's status. |
| 269 | NewMO->Contents.Reg.Prev = nullptr; |
| 270 | // Ignore existing ties. This is not a property that can be copied. |
| 271 | NewMO->TiedTo = 0; |
| 272 | // Add the new operand to MRI, but only for instructions in an MBB. |
| 273 | if (MRI) |
| 274 | MRI->addRegOperandToUseList(NewMO); |
| 275 | // The MCID operand information isn't accurate until we start adding |
| 276 | // explicit operands. The implicit operands are added first, then the |
| 277 | // explicits are inserted before them. |
| 278 | if (!isImpReg) { |
| 279 | // Tie uses to defs as indicated in MCInstrDesc. |
| 280 | if (NewMO->isUse()) { |
| 281 | int DefIdx = MCID->getOperandConstraint(OpNo, MCOI::TIED_TO); |
| 282 | if (DefIdx != -1) |
| 283 | tieOperands(DefIdx, OpNo); |
| 284 | } |
| 285 | // If the register operand is flagged as early, mark the operand as such. |
| 286 | if (MCID->getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1) |
| 287 | NewMO->setIsEarlyClobber(true); |
| 288 | } |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | /// RemoveOperand - Erase an operand from an instruction, leaving it with one |
| 293 | /// fewer operand than it started with. |
| 294 | /// |
| 295 | void MachineInstr::RemoveOperand(unsigned OpNo) { |
| 296 | assert(OpNo < getNumOperands() && "Invalid operand number")((OpNo < getNumOperands() && "Invalid operand number" ) ? static_cast<void> (0) : __assert_fail ("OpNo < getNumOperands() && \"Invalid operand number\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 296, __PRETTY_FUNCTION__)); |
| 297 | untieRegOperand(OpNo); |
| 298 | |
| 299 | #ifndef NDEBUG |
| 300 | // Moving tied operands would break the ties. |
| 301 | for (unsigned i = OpNo + 1, e = getNumOperands(); i != e; ++i) |
| 302 | if (Operands[i].isReg()) |
| 303 | assert(!Operands[i].isTied() && "Cannot move tied operands")((!Operands[i].isTied() && "Cannot move tied operands" ) ? static_cast<void> (0) : __assert_fail ("!Operands[i].isTied() && \"Cannot move tied operands\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 303, __PRETTY_FUNCTION__)); |
| 304 | #endif |
| 305 | |
| 306 | MachineRegisterInfo *MRI = getRegInfo(); |
| 307 | if (MRI && Operands[OpNo].isReg()) |
| 308 | MRI->removeRegOperandFromUseList(Operands + OpNo); |
| 309 | |
| 310 | // Don't call the MachineOperand destructor. A lot of this code depends on |
| 311 | // MachineOperand having a trivial destructor anyway, and adding a call here |
| 312 | // wouldn't make it 'destructor-correct'. |
| 313 | |
| 314 | if (unsigned N = NumOperands - 1 - OpNo) |
| 315 | moveOperands(Operands + OpNo, Operands + OpNo + 1, N, MRI); |
| 316 | --NumOperands; |
| 317 | } |
| 318 | |
| 319 | void MachineInstr::dropMemRefs(MachineFunction &MF) { |
| 320 | if (memoperands_empty()) |
| 321 | return; |
| 322 | |
| 323 | // See if we can just drop all of our extra info. |
| 324 | if (!getPreInstrSymbol() && !getPostInstrSymbol()) { |
| 325 | Info.clear(); |
| 326 | return; |
| 327 | } |
| 328 | if (!getPostInstrSymbol()) { |
| 329 | Info.set<EIIK_PreInstrSymbol>(getPreInstrSymbol()); |
| 330 | return; |
| 331 | } |
| 332 | if (!getPreInstrSymbol()) { |
| 333 | Info.set<EIIK_PostInstrSymbol>(getPostInstrSymbol()); |
| 334 | return; |
| 335 | } |
| 336 | |
| 337 | // Otherwise allocate a fresh extra info with just these symbols. |
| 338 | Info.set<EIIK_OutOfLine>( |
| 339 | MF.createMIExtraInfo({}, getPreInstrSymbol(), getPostInstrSymbol())); |
| 340 | } |
| 341 | |
| 342 | void MachineInstr::setMemRefs(MachineFunction &MF, |
| 343 | ArrayRef<MachineMemOperand *> MMOs) { |
| 344 | if (MMOs.empty()) { |
| 345 | dropMemRefs(MF); |
| 346 | return; |
| 347 | } |
| 348 | |
| 349 | // Try to store a single MMO inline. |
| 350 | if (MMOs.size() == 1 && !getPreInstrSymbol() && !getPostInstrSymbol()) { |
| 351 | Info.set<EIIK_MMO>(MMOs[0]); |
| 352 | return; |
| 353 | } |
| 354 | |
| 355 | // Otherwise create an extra info struct with all of our info. |
| 356 | Info.set<EIIK_OutOfLine>( |
| 357 | MF.createMIExtraInfo(MMOs, getPreInstrSymbol(), getPostInstrSymbol())); |
| 358 | } |
| 359 | |
| 360 | void MachineInstr::addMemOperand(MachineFunction &MF, |
| 361 | MachineMemOperand *MO) { |
| 362 | SmallVector<MachineMemOperand *, 2> MMOs; |
| 363 | MMOs.append(memoperands_begin(), memoperands_end()); |
| 364 | MMOs.push_back(MO); |
| 365 | setMemRefs(MF, MMOs); |
| 366 | } |
| 367 | |
| 368 | void MachineInstr::cloneMemRefs(MachineFunction &MF, const MachineInstr &MI) { |
| 369 | if (this == &MI) |
| 370 | // Nothing to do for a self-clone! |
| 371 | return; |
| 372 | |
| 373 | assert(&MF == MI.getMF() &&((&MF == MI.getMF() && "Invalid machine functions when cloning memory refrences!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MI.getMF() && \"Invalid machine functions when cloning memory refrences!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 374, __PRETTY_FUNCTION__)) |
| 374 | "Invalid machine functions when cloning memory refrences!")((&MF == MI.getMF() && "Invalid machine functions when cloning memory refrences!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MI.getMF() && \"Invalid machine functions when cloning memory refrences!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 374, __PRETTY_FUNCTION__)); |
| 375 | // See if we can just steal the extra info already allocated for the |
| 376 | // instruction. We can do this whenever the pre- and post-instruction symbols |
| 377 | // are the same (including null). |
| 378 | if (getPreInstrSymbol() == MI.getPreInstrSymbol() && |
| 379 | getPostInstrSymbol() == MI.getPostInstrSymbol()) { |
| 380 | Info = MI.Info; |
| 381 | return; |
| 382 | } |
| 383 | |
| 384 | // Otherwise, fall back on a copy-based clone. |
| 385 | setMemRefs(MF, MI.memoperands()); |
| 386 | } |
| 387 | |
| 388 | /// Check to see if the MMOs pointed to by the two MemRefs arrays are |
| 389 | /// identical. |
| 390 | static bool hasIdenticalMMOs(ArrayRef<MachineMemOperand *> LHS, |
| 391 | ArrayRef<MachineMemOperand *> RHS) { |
| 392 | if (LHS.size() != RHS.size()) |
| 393 | return false; |
| 394 | |
| 395 | auto LHSPointees = make_pointee_range(LHS); |
| 396 | auto RHSPointees = make_pointee_range(RHS); |
| 397 | return std::equal(LHSPointees.begin(), LHSPointees.end(), |
| 398 | RHSPointees.begin()); |
| 399 | } |
| 400 | |
| 401 | void MachineInstr::cloneMergedMemRefs(MachineFunction &MF, |
| 402 | ArrayRef<const MachineInstr *> MIs) { |
| 403 | // Try handling easy numbers of MIs with simpler mechanisms. |
| 404 | if (MIs.empty()) { |
| 405 | dropMemRefs(MF); |
| 406 | return; |
| 407 | } |
| 408 | if (MIs.size() == 1) { |
| 409 | cloneMemRefs(MF, *MIs[0]); |
| 410 | return; |
| 411 | } |
| 412 | // Because an empty memoperands list provides *no* information and must be |
| 413 | // handled conservatively (assuming the instruction can do anything), the only |
| 414 | // way to merge with it is to drop all other memoperands. |
| 415 | if (MIs[0]->memoperands_empty()) { |
| 416 | dropMemRefs(MF); |
| 417 | return; |
| 418 | } |
| 419 | |
| 420 | // Handle the general case. |
| 421 | SmallVector<MachineMemOperand *, 2> MergedMMOs; |
| 422 | // Start with the first instruction. |
| 423 | assert(&MF == MIs[0]->getMF() &&((&MF == MIs[0]->getMF() && "Invalid machine functions when cloning memory references!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MIs[0]->getMF() && \"Invalid machine functions when cloning memory references!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 424, __PRETTY_FUNCTION__)) |
| 424 | "Invalid machine functions when cloning memory references!")((&MF == MIs[0]->getMF() && "Invalid machine functions when cloning memory references!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MIs[0]->getMF() && \"Invalid machine functions when cloning memory references!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 424, __PRETTY_FUNCTION__)); |
| 425 | MergedMMOs.append(MIs[0]->memoperands_begin(), MIs[0]->memoperands_end()); |
| 426 | // Now walk all the other instructions and accumulate any different MMOs. |
| 427 | for (const MachineInstr &MI : make_pointee_range(MIs.slice(1))) { |
| 428 | assert(&MF == MI.getMF() &&((&MF == MI.getMF() && "Invalid machine functions when cloning memory references!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MI.getMF() && \"Invalid machine functions when cloning memory references!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 429, __PRETTY_FUNCTION__)) |
| 429 | "Invalid machine functions when cloning memory references!")((&MF == MI.getMF() && "Invalid machine functions when cloning memory references!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MI.getMF() && \"Invalid machine functions when cloning memory references!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 429, __PRETTY_FUNCTION__)); |
| 430 | |
| 431 | // Skip MIs with identical operands to the first. This is a somewhat |
| 432 | // arbitrary hack but will catch common cases without being quadratic. |
| 433 | // TODO: We could fully implement merge semantics here if needed. |
| 434 | if (hasIdenticalMMOs(MIs[0]->memoperands(), MI.memoperands())) |
| 435 | continue; |
| 436 | |
| 437 | // Because an empty memoperands list provides *no* information and must be |
| 438 | // handled conservatively (assuming the instruction can do anything), the |
| 439 | // only way to merge with it is to drop all other memoperands. |
| 440 | if (MI.memoperands_empty()) { |
| 441 | dropMemRefs(MF); |
| 442 | return; |
| 443 | } |
| 444 | |
| 445 | // Otherwise accumulate these into our temporary buffer of the merged state. |
| 446 | MergedMMOs.append(MI.memoperands_begin(), MI.memoperands_end()); |
| 447 | } |
| 448 | |
| 449 | setMemRefs(MF, MergedMMOs); |
| 450 | } |
| 451 | |
| 452 | void MachineInstr::setPreInstrSymbol(MachineFunction &MF, MCSymbol *Symbol) { |
| 453 | MCSymbol *OldSymbol = getPreInstrSymbol(); |
| 454 | if (OldSymbol == Symbol) |
| 455 | return; |
| 456 | if (OldSymbol && !Symbol) { |
| 457 | // We're removing a symbol rather than adding one. Try to clean up any |
| 458 | // extra info carried around. |
| 459 | if (Info.is<EIIK_PreInstrSymbol>()) { |
| 460 | Info.clear(); |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | if (memoperands_empty()) { |
| 465 | assert(getPostInstrSymbol() &&((getPostInstrSymbol() && "Should never have only a single symbol allocated out-of-line!" ) ? static_cast<void> (0) : __assert_fail ("getPostInstrSymbol() && \"Should never have only a single symbol allocated out-of-line!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 466, __PRETTY_FUNCTION__)) |
| 466 | "Should never have only a single symbol allocated out-of-line!")((getPostInstrSymbol() && "Should never have only a single symbol allocated out-of-line!" ) ? static_cast<void> (0) : __assert_fail ("getPostInstrSymbol() && \"Should never have only a single symbol allocated out-of-line!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 466, __PRETTY_FUNCTION__)); |
| 467 | Info.set<EIIK_PostInstrSymbol>(getPostInstrSymbol()); |
| 468 | return; |
| 469 | } |
| 470 | |
| 471 | // Otherwise fallback on the generic update. |
| 472 | } else if (!Info || Info.is<EIIK_PreInstrSymbol>()) { |
| 473 | // If we don't have any other extra info, we can store this inline. |
| 474 | Info.set<EIIK_PreInstrSymbol>(Symbol); |
| 475 | return; |
| 476 | } |
| 477 | |
| 478 | // Otherwise, allocate a full new set of extra info. |
| 479 | // FIXME: Maybe we should make the symbols in the extra info mutable? |
| 480 | Info.set<EIIK_OutOfLine>( |
| 481 | MF.createMIExtraInfo(memoperands(), Symbol, getPostInstrSymbol())); |
| 482 | } |
| 483 | |
| 484 | void MachineInstr::setPostInstrSymbol(MachineFunction &MF, MCSymbol *Symbol) { |
| 485 | MCSymbol *OldSymbol = getPostInstrSymbol(); |
| 486 | if (OldSymbol == Symbol) |
| 487 | return; |
| 488 | if (OldSymbol && !Symbol) { |
| 489 | // We're removing a symbol rather than adding one. Try to clean up any |
| 490 | // extra info carried around. |
| 491 | if (Info.is<EIIK_PostInstrSymbol>()) { |
| 492 | Info.clear(); |
| 493 | return; |
| 494 | } |
| 495 | |
| 496 | if (memoperands_empty()) { |
| 497 | assert(getPreInstrSymbol() &&((getPreInstrSymbol() && "Should never have only a single symbol allocated out-of-line!" ) ? static_cast<void> (0) : __assert_fail ("getPreInstrSymbol() && \"Should never have only a single symbol allocated out-of-line!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 498, __PRETTY_FUNCTION__)) |
| 498 | "Should never have only a single symbol allocated out-of-line!")((getPreInstrSymbol() && "Should never have only a single symbol allocated out-of-line!" ) ? static_cast<void> (0) : __assert_fail ("getPreInstrSymbol() && \"Should never have only a single symbol allocated out-of-line!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 498, __PRETTY_FUNCTION__)); |
| 499 | Info.set<EIIK_PreInstrSymbol>(getPreInstrSymbol()); |
| 500 | return; |
| 501 | } |
| 502 | |
| 503 | // Otherwise fallback on the generic update. |
| 504 | } else if (!Info || Info.is<EIIK_PostInstrSymbol>()) { |
| 505 | // If we don't have any other extra info, we can store this inline. |
| 506 | Info.set<EIIK_PostInstrSymbol>(Symbol); |
| 507 | return; |
| 508 | } |
| 509 | |
| 510 | // Otherwise, allocate a full new set of extra info. |
| 511 | // FIXME: Maybe we should make the symbols in the extra info mutable? |
| 512 | Info.set<EIIK_OutOfLine>( |
| 513 | MF.createMIExtraInfo(memoperands(), getPreInstrSymbol(), Symbol)); |
| 514 | } |
| 515 | |
| 516 | void MachineInstr::cloneInstrSymbols(MachineFunction &MF, |
| 517 | const MachineInstr &MI) { |
| 518 | if (this == &MI) |
| 519 | // Nothing to do for a self-clone! |
| 520 | return; |
| 521 | |
| 522 | assert(&MF == MI.getMF() &&((&MF == MI.getMF() && "Invalid machine functions when cloning instruction symbols!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MI.getMF() && \"Invalid machine functions when cloning instruction symbols!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 523, __PRETTY_FUNCTION__)) |
| 523 | "Invalid machine functions when cloning instruction symbols!")((&MF == MI.getMF() && "Invalid machine functions when cloning instruction symbols!" ) ? static_cast<void> (0) : __assert_fail ("&MF == MI.getMF() && \"Invalid machine functions when cloning instruction symbols!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 523, __PRETTY_FUNCTION__)); |
| 524 | |
| 525 | setPreInstrSymbol(MF, MI.getPreInstrSymbol()); |
| 526 | setPostInstrSymbol(MF, MI.getPostInstrSymbol()); |
| 527 | } |
| 528 | |
| 529 | uint16_t MachineInstr::mergeFlagsWith(const MachineInstr &Other) const { |
| 530 | // For now, the just return the union of the flags. If the flags get more |
| 531 | // complicated over time, we might need more logic here. |
| 532 | return getFlags() | Other.getFlags(); |
| 533 | } |
| 534 | |
| 535 | uint16_t MachineInstr::copyFlagsFromInstruction(const Instruction &I) { |
| 536 | uint16_t MIFlags = 0; |
| 537 | // Copy the wrapping flags. |
| 538 | if (const OverflowingBinaryOperator *OB = |
| 539 | dyn_cast<OverflowingBinaryOperator>(&I)) { |
| 540 | if (OB->hasNoSignedWrap()) |
| 541 | MIFlags |= MachineInstr::MIFlag::NoSWrap; |
| 542 | if (OB->hasNoUnsignedWrap()) |
| 543 | MIFlags |= MachineInstr::MIFlag::NoUWrap; |
| 544 | } |
| 545 | |
| 546 | // Copy the exact flag. |
| 547 | if (const PossiblyExactOperator *PE = dyn_cast<PossiblyExactOperator>(&I)) |
| 548 | if (PE->isExact()) |
| 549 | MIFlags |= MachineInstr::MIFlag::IsExact; |
| 550 | |
| 551 | // Copy the fast-math flags. |
| 552 | if (const FPMathOperator *FP = dyn_cast<FPMathOperator>(&I)) { |
| 553 | const FastMathFlags Flags = FP->getFastMathFlags(); |
| 554 | if (Flags.noNaNs()) |
| 555 | MIFlags |= MachineInstr::MIFlag::FmNoNans; |
| 556 | if (Flags.noInfs()) |
| 557 | MIFlags |= MachineInstr::MIFlag::FmNoInfs; |
| 558 | if (Flags.noSignedZeros()) |
| 559 | MIFlags |= MachineInstr::MIFlag::FmNsz; |
| 560 | if (Flags.allowReciprocal()) |
| 561 | MIFlags |= MachineInstr::MIFlag::FmArcp; |
| 562 | if (Flags.allowContract()) |
| 563 | MIFlags |= MachineInstr::MIFlag::FmContract; |
| 564 | if (Flags.approxFunc()) |
| 565 | MIFlags |= MachineInstr::MIFlag::FmAfn; |
| 566 | if (Flags.allowReassoc()) |
| 567 | MIFlags |= MachineInstr::MIFlag::FmReassoc; |
| 568 | } |
| 569 | |
| 570 | return MIFlags; |
| 571 | } |
| 572 | |
| 573 | void MachineInstr::copyIRFlags(const Instruction &I) { |
| 574 | Flags = copyFlagsFromInstruction(I); |
| 575 | } |
| 576 | |
| 577 | bool MachineInstr::hasPropertyInBundle(uint64_t Mask, QueryType Type) const { |
| 578 | assert(!isBundledWithPred() && "Must be called on bundle header")((!isBundledWithPred() && "Must be called on bundle header" ) ? static_cast<void> (0) : __assert_fail ("!isBundledWithPred() && \"Must be called on bundle header\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 578, __PRETTY_FUNCTION__)); |
| 579 | for (MachineBasicBlock::const_instr_iterator MII = getIterator();; ++MII) { |
| 580 | if (MII->getDesc().getFlags() & Mask) { |
| 581 | if (Type == AnyInBundle) |
| 582 | return true; |
| 583 | } else { |
| 584 | if (Type == AllInBundle && !MII->isBundle()) |
| 585 | return false; |
| 586 | } |
| 587 | // This was the last instruction in the bundle. |
| 588 | if (!MII->isBundledWithSucc()) |
| 589 | return Type == AllInBundle; |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | bool MachineInstr::isIdenticalTo(const MachineInstr &Other, |
| 594 | MICheckType Check) const { |
| 595 | // If opcodes or number of operands are not the same then the two |
| 596 | // instructions are obviously not identical. |
| 597 | if (Other.getOpcode() != getOpcode() || |
| 598 | Other.getNumOperands() != getNumOperands()) |
| 599 | return false; |
| 600 | |
| 601 | if (isBundle()) { |
| 602 | // We have passed the test above that both instructions have the same |
| 603 | // opcode, so we know that both instructions are bundles here. Let's compare |
| 604 | // MIs inside the bundle. |
| 605 | assert(Other.isBundle() && "Expected that both instructions are bundles.")((Other.isBundle() && "Expected that both instructions are bundles." ) ? static_cast<void> (0) : __assert_fail ("Other.isBundle() && \"Expected that both instructions are bundles.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 605, __PRETTY_FUNCTION__)); |
| 606 | MachineBasicBlock::const_instr_iterator I1 = getIterator(); |
| 607 | MachineBasicBlock::const_instr_iterator I2 = Other.getIterator(); |
| 608 | // Loop until we analysed the last intruction inside at least one of the |
| 609 | // bundles. |
| 610 | while (I1->isBundledWithSucc() && I2->isBundledWithSucc()) { |
| 611 | ++I1; |
| 612 | ++I2; |
| 613 | if (!I1->isIdenticalTo(*I2, Check)) |
| 614 | return false; |
| 615 | } |
| 616 | // If we've reached the end of just one of the two bundles, but not both, |
| 617 | // the instructions are not identical. |
| 618 | if (I1->isBundledWithSucc() || I2->isBundledWithSucc()) |
| 619 | return false; |
| 620 | } |
| 621 | |
| 622 | // Check operands to make sure they match. |
| 623 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { |
| 624 | const MachineOperand &MO = getOperand(i); |
| 625 | const MachineOperand &OMO = Other.getOperand(i); |
| 626 | if (!MO.isReg()) { |
| 627 | if (!MO.isIdenticalTo(OMO)) |
| 628 | return false; |
| 629 | continue; |
| 630 | } |
| 631 | |
| 632 | // Clients may or may not want to ignore defs when testing for equality. |
| 633 | // For example, machine CSE pass only cares about finding common |
| 634 | // subexpressions, so it's safe to ignore virtual register defs. |
| 635 | if (MO.isDef()) { |
| 636 | if (Check == IgnoreDefs) |
| 637 | continue; |
| 638 | else if (Check == IgnoreVRegDefs) { |
| 639 | if (!TargetRegisterInfo::isVirtualRegister(MO.getReg()) || |
| 640 | !TargetRegisterInfo::isVirtualRegister(OMO.getReg())) |
| 641 | if (!MO.isIdenticalTo(OMO)) |
| 642 | return false; |
| 643 | } else { |
| 644 | if (!MO.isIdenticalTo(OMO)) |
| 645 | return false; |
| 646 | if (Check == CheckKillDead && MO.isDead() != OMO.isDead()) |
| 647 | return false; |
| 648 | } |
| 649 | } else { |
| 650 | if (!MO.isIdenticalTo(OMO)) |
| 651 | return false; |
| 652 | if (Check == CheckKillDead && MO.isKill() != OMO.isKill()) |
| 653 | return false; |
| 654 | } |
| 655 | } |
| 656 | // If DebugLoc does not match then two debug instructions are not identical. |
| 657 | if (isDebugInstr()) |
| 658 | if (getDebugLoc() && Other.getDebugLoc() && |
| 659 | getDebugLoc() != Other.getDebugLoc()) |
| 660 | return false; |
| 661 | return true; |
| 662 | } |
| 663 | |
| 664 | const MachineFunction *MachineInstr::getMF() const { |
| 665 | return getParent()->getParent(); |
| 666 | } |
| 667 | |
| 668 | MachineInstr *MachineInstr::removeFromParent() { |
| 669 | assert(getParent() && "Not embedded in a basic block!")((getParent() && "Not embedded in a basic block!") ? static_cast <void> (0) : __assert_fail ("getParent() && \"Not embedded in a basic block!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 669, __PRETTY_FUNCTION__)); |
| 670 | return getParent()->remove(this); |
| 671 | } |
| 672 | |
| 673 | MachineInstr *MachineInstr::removeFromBundle() { |
| 674 | assert(getParent() && "Not embedded in a basic block!")((getParent() && "Not embedded in a basic block!") ? static_cast <void> (0) : __assert_fail ("getParent() && \"Not embedded in a basic block!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 674, __PRETTY_FUNCTION__)); |
| 675 | return getParent()->remove_instr(this); |
| 676 | } |
| 677 | |
| 678 | void MachineInstr::eraseFromParent() { |
| 679 | assert(getParent() && "Not embedded in a basic block!")((getParent() && "Not embedded in a basic block!") ? static_cast <void> (0) : __assert_fail ("getParent() && \"Not embedded in a basic block!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 679, __PRETTY_FUNCTION__)); |
| 680 | getParent()->erase(this); |
| 681 | } |
| 682 | |
| 683 | void MachineInstr::eraseFromParentAndMarkDBGValuesForRemoval() { |
| 684 | assert(getParent() && "Not embedded in a basic block!")((getParent() && "Not embedded in a basic block!") ? static_cast <void> (0) : __assert_fail ("getParent() && \"Not embedded in a basic block!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 684, __PRETTY_FUNCTION__)); |
| 685 | MachineBasicBlock *MBB = getParent(); |
| 686 | MachineFunction *MF = MBB->getParent(); |
| 687 | assert(MF && "Not embedded in a function!")((MF && "Not embedded in a function!") ? static_cast< void> (0) : __assert_fail ("MF && \"Not embedded in a function!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 687, __PRETTY_FUNCTION__)); |
| 688 | |
| 689 | MachineInstr *MI = (MachineInstr *)this; |
| 690 | MachineRegisterInfo &MRI = MF->getRegInfo(); |
| 691 | |
| 692 | for (const MachineOperand &MO : MI->operands()) { |
| 693 | if (!MO.isReg() || !MO.isDef()) |
| 694 | continue; |
| 695 | unsigned Reg = MO.getReg(); |
| 696 | if (!TargetRegisterInfo::isVirtualRegister(Reg)) |
| 697 | continue; |
| 698 | MRI.markUsesInDebugValueAsUndef(Reg); |
| 699 | } |
| 700 | MI->eraseFromParent(); |
| 701 | } |
| 702 | |
| 703 | void MachineInstr::eraseFromBundle() { |
| 704 | assert(getParent() && "Not embedded in a basic block!")((getParent() && "Not embedded in a basic block!") ? static_cast <void> (0) : __assert_fail ("getParent() && \"Not embedded in a basic block!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 704, __PRETTY_FUNCTION__)); |
| 705 | getParent()->erase_instr(this); |
| 706 | } |
| 707 | |
| 708 | unsigned MachineInstr::getNumExplicitOperands() const { |
| 709 | unsigned NumOperands = MCID->getNumOperands(); |
| 710 | if (!MCID->isVariadic()) |
| 711 | return NumOperands; |
| 712 | |
| 713 | for (unsigned I = NumOperands, E = getNumOperands(); I != E; ++I) { |
| 714 | const MachineOperand &MO = getOperand(I); |
| 715 | // The operands must always be in the following order: |
| 716 | // - explicit reg defs, |
| 717 | // - other explicit operands (reg uses, immediates, etc.), |
| 718 | // - implicit reg defs |
| 719 | // - implicit reg uses |
| 720 | if (MO.isReg() && MO.isImplicit()) |
| 721 | break; |
| 722 | ++NumOperands; |
| 723 | } |
| 724 | return NumOperands; |
| 725 | } |
| 726 | |
| 727 | unsigned MachineInstr::getNumExplicitDefs() const { |
| 728 | unsigned NumDefs = MCID->getNumDefs(); |
| 729 | if (!MCID->isVariadic()) |
| 730 | return NumDefs; |
| 731 | |
| 732 | for (unsigned I = NumDefs, E = getNumOperands(); I != E; ++I) { |
| 733 | const MachineOperand &MO = getOperand(I); |
| 734 | if (!MO.isReg() || !MO.isDef() || MO.isImplicit()) |
| 735 | break; |
| 736 | ++NumDefs; |
| 737 | } |
| 738 | return NumDefs; |
| 739 | } |
| 740 | |
| 741 | void MachineInstr::bundleWithPred() { |
| 742 | assert(!isBundledWithPred() && "MI is already bundled with its predecessor")((!isBundledWithPred() && "MI is already bundled with its predecessor" ) ? static_cast<void> (0) : __assert_fail ("!isBundledWithPred() && \"MI is already bundled with its predecessor\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 742, __PRETTY_FUNCTION__)); |
| 743 | setFlag(BundledPred); |
| 744 | MachineBasicBlock::instr_iterator Pred = getIterator(); |
| 745 | --Pred; |
| 746 | assert(!Pred->isBundledWithSucc() && "Inconsistent bundle flags")((!Pred->isBundledWithSucc() && "Inconsistent bundle flags" ) ? static_cast<void> (0) : __assert_fail ("!Pred->isBundledWithSucc() && \"Inconsistent bundle flags\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 746, __PRETTY_FUNCTION__)); |
| 747 | Pred->setFlag(BundledSucc); |
| 748 | } |
| 749 | |
| 750 | void MachineInstr::bundleWithSucc() { |
| 751 | assert(!isBundledWithSucc() && "MI is already bundled with its successor")((!isBundledWithSucc() && "MI is already bundled with its successor" ) ? static_cast<void> (0) : __assert_fail ("!isBundledWithSucc() && \"MI is already bundled with its successor\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 751, __PRETTY_FUNCTION__)); |
| 752 | setFlag(BundledSucc); |
| 753 | MachineBasicBlock::instr_iterator Succ = getIterator(); |
| 754 | ++Succ; |
| 755 | assert(!Succ->isBundledWithPred() && "Inconsistent bundle flags")((!Succ->isBundledWithPred() && "Inconsistent bundle flags" ) ? static_cast<void> (0) : __assert_fail ("!Succ->isBundledWithPred() && \"Inconsistent bundle flags\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 755, __PRETTY_FUNCTION__)); |
| 756 | Succ->setFlag(BundledPred); |
| 757 | } |
| 758 | |
| 759 | void MachineInstr::unbundleFromPred() { |
| 760 | assert(isBundledWithPred() && "MI isn't bundled with its predecessor")((isBundledWithPred() && "MI isn't bundled with its predecessor" ) ? static_cast<void> (0) : __assert_fail ("isBundledWithPred() && \"MI isn't bundled with its predecessor\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 760, __PRETTY_FUNCTION__)); |
| 761 | clearFlag(BundledPred); |
| 762 | MachineBasicBlock::instr_iterator Pred = getIterator(); |
| 763 | --Pred; |
| 764 | assert(Pred->isBundledWithSucc() && "Inconsistent bundle flags")((Pred->isBundledWithSucc() && "Inconsistent bundle flags" ) ? static_cast<void> (0) : __assert_fail ("Pred->isBundledWithSucc() && \"Inconsistent bundle flags\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 764, __PRETTY_FUNCTION__)); |
| 765 | Pred->clearFlag(BundledSucc); |
| 766 | } |
| 767 | |
| 768 | void MachineInstr::unbundleFromSucc() { |
| 769 | assert(isBundledWithSucc() && "MI isn't bundled with its successor")((isBundledWithSucc() && "MI isn't bundled with its successor" ) ? static_cast<void> (0) : __assert_fail ("isBundledWithSucc() && \"MI isn't bundled with its successor\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 769, __PRETTY_FUNCTION__)); |
| 770 | clearFlag(BundledSucc); |
| 771 | MachineBasicBlock::instr_iterator Succ = getIterator(); |
| 772 | ++Succ; |
| 773 | assert(Succ->isBundledWithPred() && "Inconsistent bundle flags")((Succ->isBundledWithPred() && "Inconsistent bundle flags" ) ? static_cast<void> (0) : __assert_fail ("Succ->isBundledWithPred() && \"Inconsistent bundle flags\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 773, __PRETTY_FUNCTION__)); |
| 774 | Succ->clearFlag(BundledPred); |
| 775 | } |
| 776 | |
| 777 | bool MachineInstr::isStackAligningInlineAsm() const { |
| 778 | if (isInlineAsm()) { |
| 779 | unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); |
| 780 | if (ExtraInfo & InlineAsm::Extra_IsAlignStack) |
| 781 | return true; |
| 782 | } |
| 783 | return false; |
| 784 | } |
| 785 | |
| 786 | InlineAsm::AsmDialect MachineInstr::getInlineAsmDialect() const { |
| 787 | assert(isInlineAsm() && "getInlineAsmDialect() only works for inline asms!")((isInlineAsm() && "getInlineAsmDialect() only works for inline asms!" ) ? static_cast<void> (0) : __assert_fail ("isInlineAsm() && \"getInlineAsmDialect() only works for inline asms!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 787, __PRETTY_FUNCTION__)); |
| 788 | unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); |
| 789 | return InlineAsm::AsmDialect((ExtraInfo & InlineAsm::Extra_AsmDialect) != 0); |
| 790 | } |
| 791 | |
| 792 | int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx, |
| 793 | unsigned *GroupNo) const { |
| 794 | assert(isInlineAsm() && "Expected an inline asm instruction")((isInlineAsm() && "Expected an inline asm instruction" ) ? static_cast<void> (0) : __assert_fail ("isInlineAsm() && \"Expected an inline asm instruction\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 794, __PRETTY_FUNCTION__)); |
| 795 | assert(OpIdx < getNumOperands() && "OpIdx out of range")((OpIdx < getNumOperands() && "OpIdx out of range" ) ? static_cast<void> (0) : __assert_fail ("OpIdx < getNumOperands() && \"OpIdx out of range\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 795, __PRETTY_FUNCTION__)); |
| 796 | |
| 797 | // Ignore queries about the initial operands. |
| 798 | if (OpIdx < InlineAsm::MIOp_FirstOperand) |
| 799 | return -1; |
| 800 | |
| 801 | unsigned Group = 0; |
| 802 | unsigned NumOps; |
| 803 | for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e; |
| 804 | i += NumOps) { |
| 805 | const MachineOperand &FlagMO = getOperand(i); |
| 806 | // If we reach the implicit register operands, stop looking. |
| 807 | if (!FlagMO.isImm()) |
| 808 | return -1; |
| 809 | NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm()); |
| 810 | if (i + NumOps > OpIdx) { |
| 811 | if (GroupNo) |
| 812 | *GroupNo = Group; |
| 813 | return i; |
| 814 | } |
| 815 | ++Group; |
| 816 | } |
| 817 | return -1; |
| 818 | } |
| 819 | |
| 820 | const DILabel *MachineInstr::getDebugLabel() const { |
| 821 | assert(isDebugLabel() && "not a DBG_LABEL")((isDebugLabel() && "not a DBG_LABEL") ? static_cast< void> (0) : __assert_fail ("isDebugLabel() && \"not a DBG_LABEL\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 821, __PRETTY_FUNCTION__)); |
| 822 | return cast<DILabel>(getOperand(0).getMetadata()); |
| 823 | } |
| 824 | |
| 825 | const DILocalVariable *MachineInstr::getDebugVariable() const { |
| 826 | assert(isDebugValue() && "not a DBG_VALUE")((isDebugValue() && "not a DBG_VALUE") ? static_cast< void> (0) : __assert_fail ("isDebugValue() && \"not a DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 826, __PRETTY_FUNCTION__)); |
| 827 | return cast<DILocalVariable>(getOperand(2).getMetadata()); |
| 828 | } |
| 829 | |
| 830 | const DIExpression *MachineInstr::getDebugExpression() const { |
| 831 | assert(isDebugValue() && "not a DBG_VALUE")((isDebugValue() && "not a DBG_VALUE") ? static_cast< void> (0) : __assert_fail ("isDebugValue() && \"not a DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 831, __PRETTY_FUNCTION__)); |
| 832 | return cast<DIExpression>(getOperand(3).getMetadata()); |
| 833 | } |
| 834 | |
| 835 | const TargetRegisterClass* |
| 836 | MachineInstr::getRegClassConstraint(unsigned OpIdx, |
| 837 | const TargetInstrInfo *TII, |
| 838 | const TargetRegisterInfo *TRI) const { |
| 839 | assert(getParent() && "Can't have an MBB reference here!")((getParent() && "Can't have an MBB reference here!") ? static_cast<void> (0) : __assert_fail ("getParent() && \"Can't have an MBB reference here!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 839, __PRETTY_FUNCTION__)); |
| 840 | assert(getMF() && "Can't have an MF reference here!")((getMF() && "Can't have an MF reference here!") ? static_cast <void> (0) : __assert_fail ("getMF() && \"Can't have an MF reference here!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 840, __PRETTY_FUNCTION__)); |
| 841 | const MachineFunction &MF = *getMF(); |
| 842 | |
| 843 | // Most opcodes have fixed constraints in their MCInstrDesc. |
| 844 | if (!isInlineAsm()) |
| 845 | return TII->getRegClass(getDesc(), OpIdx, TRI, MF); |
| 846 | |
| 847 | if (!getOperand(OpIdx).isReg()) |
| 848 | return nullptr; |
| 849 | |
| 850 | // For tied uses on inline asm, get the constraint from the def. |
| 851 | unsigned DefIdx; |
| 852 | if (getOperand(OpIdx).isUse() && isRegTiedToDefOperand(OpIdx, &DefIdx)) |
| 853 | OpIdx = DefIdx; |
| 854 | |
| 855 | // Inline asm stores register class constraints in the flag word. |
| 856 | int FlagIdx = findInlineAsmFlagIdx(OpIdx); |
| 857 | if (FlagIdx < 0) |
| 858 | return nullptr; |
| 859 | |
| 860 | unsigned Flag = getOperand(FlagIdx).getImm(); |
| 861 | unsigned RCID; |
| 862 | if ((InlineAsm::getKind(Flag) == InlineAsm::Kind_RegUse || |
| 863 | InlineAsm::getKind(Flag) == InlineAsm::Kind_RegDef || |
| 864 | InlineAsm::getKind(Flag) == InlineAsm::Kind_RegDefEarlyClobber) && |
| 865 | InlineAsm::hasRegClassConstraint(Flag, RCID)) |
| 866 | return TRI->getRegClass(RCID); |
| 867 | |
| 868 | // Assume that all registers in a memory operand are pointers. |
| 869 | if (InlineAsm::getKind(Flag) == InlineAsm::Kind_Mem) |
| 870 | return TRI->getPointerRegClass(MF); |
| 871 | |
| 872 | return nullptr; |
| 873 | } |
| 874 | |
| 875 | const TargetRegisterClass *MachineInstr::getRegClassConstraintEffectForVReg( |
| 876 | unsigned Reg, const TargetRegisterClass *CurRC, const TargetInstrInfo *TII, |
| 877 | const TargetRegisterInfo *TRI, bool ExploreBundle) const { |
| 878 | // Check every operands inside the bundle if we have |
| 879 | // been asked to. |
| 880 | if (ExploreBundle) |
| 881 | for (ConstMIBundleOperands OpndIt(*this); OpndIt.isValid() && CurRC; |
| 882 | ++OpndIt) |
| 883 | CurRC = OpndIt->getParent()->getRegClassConstraintEffectForVRegImpl( |
| 884 | OpndIt.getOperandNo(), Reg, CurRC, TII, TRI); |
| 885 | else |
| 886 | // Otherwise, just check the current operands. |
| 887 | for (unsigned i = 0, e = NumOperands; i < e && CurRC; ++i) |
| 888 | CurRC = getRegClassConstraintEffectForVRegImpl(i, Reg, CurRC, TII, TRI); |
| 889 | return CurRC; |
| 890 | } |
| 891 | |
| 892 | const TargetRegisterClass *MachineInstr::getRegClassConstraintEffectForVRegImpl( |
| 893 | unsigned OpIdx, unsigned Reg, const TargetRegisterClass *CurRC, |
| 894 | const TargetInstrInfo *TII, const TargetRegisterInfo *TRI) const { |
| 895 | assert(CurRC && "Invalid initial register class")((CurRC && "Invalid initial register class") ? static_cast <void> (0) : __assert_fail ("CurRC && \"Invalid initial register class\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 895, __PRETTY_FUNCTION__)); |
| 896 | // Check if Reg is constrained by some of its use/def from MI. |
| 897 | const MachineOperand &MO = getOperand(OpIdx); |
| 898 | if (!MO.isReg() || MO.getReg() != Reg) |
| 899 | return CurRC; |
| 900 | // If yes, accumulate the constraints through the operand. |
| 901 | return getRegClassConstraintEffect(OpIdx, CurRC, TII, TRI); |
| 902 | } |
| 903 | |
| 904 | const TargetRegisterClass *MachineInstr::getRegClassConstraintEffect( |
| 905 | unsigned OpIdx, const TargetRegisterClass *CurRC, |
| 906 | const TargetInstrInfo *TII, const TargetRegisterInfo *TRI) const { |
| 907 | const TargetRegisterClass *OpRC = getRegClassConstraint(OpIdx, TII, TRI); |
| 908 | const MachineOperand &MO = getOperand(OpIdx); |
| 909 | assert(MO.isReg() &&((MO.isReg() && "Cannot get register constraints for non-register operand" ) ? static_cast<void> (0) : __assert_fail ("MO.isReg() && \"Cannot get register constraints for non-register operand\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 910, __PRETTY_FUNCTION__)) |
| 910 | "Cannot get register constraints for non-register operand")((MO.isReg() && "Cannot get register constraints for non-register operand" ) ? static_cast<void> (0) : __assert_fail ("MO.isReg() && \"Cannot get register constraints for non-register operand\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 910, __PRETTY_FUNCTION__)); |
| 911 | assert(CurRC && "Invalid initial register class")((CurRC && "Invalid initial register class") ? static_cast <void> (0) : __assert_fail ("CurRC && \"Invalid initial register class\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 911, __PRETTY_FUNCTION__)); |
| 912 | if (unsigned SubIdx = MO.getSubReg()) { |
| 913 | if (OpRC) |
| 914 | CurRC = TRI->getMatchingSuperRegClass(CurRC, OpRC, SubIdx); |
| 915 | else |
| 916 | CurRC = TRI->getSubClassWithSubReg(CurRC, SubIdx); |
| 917 | } else if (OpRC) |
| 918 | CurRC = TRI->getCommonSubClass(CurRC, OpRC); |
| 919 | return CurRC; |
| 920 | } |
| 921 | |
| 922 | /// Return the number of instructions inside the MI bundle, not counting the |
| 923 | /// header instruction. |
| 924 | unsigned MachineInstr::getBundleSize() const { |
| 925 | MachineBasicBlock::const_instr_iterator I = getIterator(); |
| 926 | unsigned Size = 0; |
| 927 | while (I->isBundledWithSucc()) { |
| 928 | ++Size; |
| 929 | ++I; |
| 930 | } |
| 931 | return Size; |
| 932 | } |
| 933 | |
| 934 | /// Returns true if the MachineInstr has an implicit-use operand of exactly |
| 935 | /// the given register (not considering sub/super-registers). |
| 936 | bool MachineInstr::hasRegisterImplicitUseOperand(unsigned Reg) const { |
| 937 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { |
| 938 | const MachineOperand &MO = getOperand(i); |
| 939 | if (MO.isReg() && MO.isUse() && MO.isImplicit() && MO.getReg() == Reg) |
| 940 | return true; |
| 941 | } |
| 942 | return false; |
| 943 | } |
| 944 | |
| 945 | /// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of |
| 946 | /// the specific register or -1 if it is not found. It further tightens |
| 947 | /// the search criteria to a use that kills the register if isKill is true. |
| 948 | int MachineInstr::findRegisterUseOperandIdx( |
| 949 | unsigned Reg, bool isKill, const TargetRegisterInfo *TRI) const { |
| 950 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { |
| 951 | const MachineOperand &MO = getOperand(i); |
| 952 | if (!MO.isReg() || !MO.isUse()) |
| 953 | continue; |
| 954 | unsigned MOReg = MO.getReg(); |
| 955 | if (!MOReg) |
| 956 | continue; |
| 957 | if (MOReg == Reg || (TRI && Reg && MOReg && TRI->regsOverlap(MOReg, Reg))) |
| 958 | if (!isKill || MO.isKill()) |
| 959 | return i; |
| 960 | } |
| 961 | return -1; |
| 962 | } |
| 963 | |
| 964 | /// readsWritesVirtualRegister - Return a pair of bools (reads, writes) |
| 965 | /// indicating if this instruction reads or writes Reg. This also considers |
| 966 | /// partial defines. |
| 967 | std::pair<bool,bool> |
| 968 | MachineInstr::readsWritesVirtualRegister(unsigned Reg, |
| 969 | SmallVectorImpl<unsigned> *Ops) const { |
| 970 | bool PartDef = false; // Partial redefine. |
| 971 | bool FullDef = false; // Full define. |
| 972 | bool Use = false; |
| 973 | |
| 974 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { |
| 975 | const MachineOperand &MO = getOperand(i); |
| 976 | if (!MO.isReg() || MO.getReg() != Reg) |
| 977 | continue; |
| 978 | if (Ops) |
| 979 | Ops->push_back(i); |
| 980 | if (MO.isUse()) |
| 981 | Use |= !MO.isUndef(); |
| 982 | else if (MO.getSubReg() && !MO.isUndef()) |
| 983 | // A partial def undef doesn't count as reading the register. |
| 984 | PartDef = true; |
| 985 | else |
| 986 | FullDef = true; |
| 987 | } |
| 988 | // A partial redefine uses Reg unless there is also a full define. |
| 989 | return std::make_pair(Use || (PartDef && !FullDef), PartDef || FullDef); |
| 990 | } |
| 991 | |
| 992 | /// findRegisterDefOperandIdx() - Returns the operand index that is a def of |
| 993 | /// the specified register or -1 if it is not found. If isDead is true, defs |
| 994 | /// that are not dead are skipped. If TargetRegisterInfo is non-null, then it |
| 995 | /// also checks if there is a def of a super-register. |
| 996 | int |
| 997 | MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead, bool Overlap, |
| 998 | const TargetRegisterInfo *TRI) const { |
| 999 | bool isPhys = TargetRegisterInfo::isPhysicalRegister(Reg); |
| 1000 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { |
| 1001 | const MachineOperand &MO = getOperand(i); |
| 1002 | // Accept regmask operands when Overlap is set. |
| 1003 | // Ignore them when looking for a specific def operand (Overlap == false). |
| 1004 | if (isPhys && Overlap && MO.isRegMask() && MO.clobbersPhysReg(Reg)) |
| 1005 | return i; |
| 1006 | if (!MO.isReg() || !MO.isDef()) |
| 1007 | continue; |
| 1008 | unsigned MOReg = MO.getReg(); |
| 1009 | bool Found = (MOReg == Reg); |
| 1010 | if (!Found && TRI && isPhys && |
| 1011 | TargetRegisterInfo::isPhysicalRegister(MOReg)) { |
| 1012 | if (Overlap) |
| 1013 | Found = TRI->regsOverlap(MOReg, Reg); |
| 1014 | else |
| 1015 | Found = TRI->isSubRegister(MOReg, Reg); |
| 1016 | } |
| 1017 | if (Found && (!isDead || MO.isDead())) |
| 1018 | return i; |
| 1019 | } |
| 1020 | return -1; |
| 1021 | } |
| 1022 | |
| 1023 | /// findFirstPredOperandIdx() - Find the index of the first operand in the |
| 1024 | /// operand list that is used to represent the predicate. It returns -1 if |
| 1025 | /// none is found. |
| 1026 | int MachineInstr::findFirstPredOperandIdx() const { |
| 1027 | // Don't call MCID.findFirstPredOperandIdx() because this variant |
| 1028 | // is sometimes called on an instruction that's not yet complete, and |
| 1029 | // so the number of operands is less than the MCID indicates. In |
| 1030 | // particular, the PTX target does this. |
| 1031 | const MCInstrDesc &MCID = getDesc(); |
| 1032 | if (MCID.isPredicable()) { |
| 1033 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) |
| 1034 | if (MCID.OpInfo[i].isPredicate()) |
| 1035 | return i; |
| 1036 | } |
| 1037 | |
| 1038 | return -1; |
| 1039 | } |
| 1040 | |
| 1041 | // MachineOperand::TiedTo is 4 bits wide. |
| 1042 | const unsigned TiedMax = 15; |
| 1043 | |
| 1044 | /// tieOperands - Mark operands at DefIdx and UseIdx as tied to each other. |
| 1045 | /// |
| 1046 | /// Use and def operands can be tied together, indicated by a non-zero TiedTo |
| 1047 | /// field. TiedTo can have these values: |
| 1048 | /// |
| 1049 | /// 0: Operand is not tied to anything. |
| 1050 | /// 1 to TiedMax-1: Tied to getOperand(TiedTo-1). |
| 1051 | /// TiedMax: Tied to an operand >= TiedMax-1. |
| 1052 | /// |
| 1053 | /// The tied def must be one of the first TiedMax operands on a normal |
| 1054 | /// instruction. INLINEASM instructions allow more tied defs. |
| 1055 | /// |
| 1056 | void MachineInstr::tieOperands(unsigned DefIdx, unsigned UseIdx) { |
| 1057 | MachineOperand &DefMO = getOperand(DefIdx); |
| 1058 | MachineOperand &UseMO = getOperand(UseIdx); |
| 1059 | assert(DefMO.isDef() && "DefIdx must be a def operand")((DefMO.isDef() && "DefIdx must be a def operand") ? static_cast <void> (0) : __assert_fail ("DefMO.isDef() && \"DefIdx must be a def operand\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1059, __PRETTY_FUNCTION__)); |
| 1060 | assert(UseMO.isUse() && "UseIdx must be a use operand")((UseMO.isUse() && "UseIdx must be a use operand") ? static_cast <void> (0) : __assert_fail ("UseMO.isUse() && \"UseIdx must be a use operand\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1060, __PRETTY_FUNCTION__)); |
| 1061 | assert(!DefMO.isTied() && "Def is already tied to another use")((!DefMO.isTied() && "Def is already tied to another use" ) ? static_cast<void> (0) : __assert_fail ("!DefMO.isTied() && \"Def is already tied to another use\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1061, __PRETTY_FUNCTION__)); |
| 1062 | assert(!UseMO.isTied() && "Use is already tied to another def")((!UseMO.isTied() && "Use is already tied to another def" ) ? static_cast<void> (0) : __assert_fail ("!UseMO.isTied() && \"Use is already tied to another def\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1062, __PRETTY_FUNCTION__)); |
| 1063 | |
| 1064 | if (DefIdx < TiedMax) |
| 1065 | UseMO.TiedTo = DefIdx + 1; |
| 1066 | else { |
| 1067 | // Inline asm can use the group descriptors to find tied operands, but on |
| 1068 | // normal instruction, the tied def must be within the first TiedMax |
| 1069 | // operands. |
| 1070 | assert(isInlineAsm() && "DefIdx out of range")((isInlineAsm() && "DefIdx out of range") ? static_cast <void> (0) : __assert_fail ("isInlineAsm() && \"DefIdx out of range\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1070, __PRETTY_FUNCTION__)); |
| 1071 | UseMO.TiedTo = TiedMax; |
| 1072 | } |
| 1073 | |
| 1074 | // UseIdx can be out of range, we'll search for it in findTiedOperandIdx(). |
| 1075 | DefMO.TiedTo = std::min(UseIdx + 1, TiedMax); |
| 1076 | } |
| 1077 | |
| 1078 | /// Given the index of a tied register operand, find the operand it is tied to. |
| 1079 | /// Defs are tied to uses and vice versa. Returns the index of the tied operand |
| 1080 | /// which must exist. |
| 1081 | unsigned MachineInstr::findTiedOperandIdx(unsigned OpIdx) const { |
| 1082 | const MachineOperand &MO = getOperand(OpIdx); |
| 1083 | assert(MO.isTied() && "Operand isn't tied")((MO.isTied() && "Operand isn't tied") ? static_cast< void> (0) : __assert_fail ("MO.isTied() && \"Operand isn't tied\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1083, __PRETTY_FUNCTION__)); |
| 1084 | |
| 1085 | // Normally TiedTo is in range. |
| 1086 | if (MO.TiedTo < TiedMax) |
| 1087 | return MO.TiedTo - 1; |
| 1088 | |
| 1089 | // Uses on normal instructions can be out of range. |
| 1090 | if (!isInlineAsm()) { |
| 1091 | // Normal tied defs must be in the 0..TiedMax-1 range. |
| 1092 | if (MO.isUse()) |
| 1093 | return TiedMax - 1; |
| 1094 | // MO is a def. Search for the tied use. |
| 1095 | for (unsigned i = TiedMax - 1, e = getNumOperands(); i != e; ++i) { |
| 1096 | const MachineOperand &UseMO = getOperand(i); |
| 1097 | if (UseMO.isReg() && UseMO.isUse() && UseMO.TiedTo == OpIdx + 1) |
| 1098 | return i; |
| 1099 | } |
| 1100 | llvm_unreachable("Can't find tied use")::llvm::llvm_unreachable_internal("Can't find tied use", "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1100); |
| 1101 | } |
| 1102 | |
| 1103 | // Now deal with inline asm by parsing the operand group descriptor flags. |
| 1104 | // Find the beginning of each operand group. |
| 1105 | SmallVector<unsigned, 8> GroupIdx; |
| 1106 | unsigned OpIdxGroup = ~0u; |
| 1107 | unsigned NumOps; |
| 1108 | for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e; |
| 1109 | i += NumOps) { |
| 1110 | const MachineOperand &FlagMO = getOperand(i); |
| 1111 | assert(FlagMO.isImm() && "Invalid tied operand on inline asm")((FlagMO.isImm() && "Invalid tied operand on inline asm" ) ? static_cast<void> (0) : __assert_fail ("FlagMO.isImm() && \"Invalid tied operand on inline asm\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1111, __PRETTY_FUNCTION__)); |
| 1112 | unsigned CurGroup = GroupIdx.size(); |
| 1113 | GroupIdx.push_back(i); |
| 1114 | NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm()); |
| 1115 | // OpIdx belongs to this operand group. |
| 1116 | if (OpIdx > i && OpIdx < i + NumOps) |
| 1117 | OpIdxGroup = CurGroup; |
| 1118 | unsigned TiedGroup; |
| 1119 | if (!InlineAsm::isUseOperandTiedToDef(FlagMO.getImm(), TiedGroup)) |
| 1120 | continue; |
| 1121 | // Operands in this group are tied to operands in TiedGroup which must be |
| 1122 | // earlier. Find the number of operands between the two groups. |
| 1123 | unsigned Delta = i - GroupIdx[TiedGroup]; |
| 1124 | |
| 1125 | // OpIdx is a use tied to TiedGroup. |
| 1126 | if (OpIdxGroup == CurGroup) |
| 1127 | return OpIdx - Delta; |
| 1128 | |
| 1129 | // OpIdx is a def tied to this use group. |
| 1130 | if (OpIdxGroup == TiedGroup) |
| 1131 | return OpIdx + Delta; |
| 1132 | } |
| 1133 | llvm_unreachable("Invalid tied operand on inline asm")::llvm::llvm_unreachable_internal("Invalid tied operand on inline asm" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1133); |
| 1134 | } |
| 1135 | |
| 1136 | /// clearKillInfo - Clears kill flags on all operands. |
| 1137 | /// |
| 1138 | void MachineInstr::clearKillInfo() { |
| 1139 | for (MachineOperand &MO : operands()) { |
| 1140 | if (MO.isReg() && MO.isUse()) |
| 1141 | MO.setIsKill(false); |
| 1142 | } |
| 1143 | } |
| 1144 | |
| 1145 | void MachineInstr::substituteRegister(unsigned FromReg, unsigned ToReg, |
| 1146 | unsigned SubIdx, |
| 1147 | const TargetRegisterInfo &RegInfo) { |
| 1148 | if (TargetRegisterInfo::isPhysicalRegister(ToReg)) { |
| 1149 | if (SubIdx) |
| 1150 | ToReg = RegInfo.getSubReg(ToReg, SubIdx); |
| 1151 | for (MachineOperand &MO : operands()) { |
| 1152 | if (!MO.isReg() || MO.getReg() != FromReg) |
| 1153 | continue; |
| 1154 | MO.substPhysReg(ToReg, RegInfo); |
| 1155 | } |
| 1156 | } else { |
| 1157 | for (MachineOperand &MO : operands()) { |
| 1158 | if (!MO.isReg() || MO.getReg() != FromReg) |
| 1159 | continue; |
| 1160 | MO.substVirtReg(ToReg, SubIdx, RegInfo); |
| 1161 | } |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | /// isSafeToMove - Return true if it is safe to move this instruction. If |
| 1166 | /// SawStore is set to true, it means that there is a store (or call) between |
| 1167 | /// the instruction's location and its intended destination. |
| 1168 | bool MachineInstr::isSafeToMove(AliasAnalysis *AA, bool &SawStore) const { |
| 1169 | // Ignore stuff that we obviously can't move. |
| 1170 | // |
| 1171 | // Treat volatile loads as stores. This is not strictly necessary for |
| 1172 | // volatiles, but it is required for atomic loads. It is not allowed to move |
| 1173 | // a load across an atomic load with Ordering > Monotonic. |
| 1174 | if (mayStore() || isCall() || isPHI() || |
| 1175 | (mayLoad() && hasOrderedMemoryRef())) { |
| 1176 | SawStore = true; |
| 1177 | return false; |
| 1178 | } |
| 1179 | |
| 1180 | if (isPosition() || isDebugInstr() || isTerminator() || |
| 1181 | hasUnmodeledSideEffects()) |
| 1182 | return false; |
| 1183 | |
| 1184 | // See if this instruction does a load. If so, we have to guarantee that the |
| 1185 | // loaded value doesn't change between the load and the its intended |
| 1186 | // destination. The check for isInvariantLoad gives the targe the chance to |
| 1187 | // classify the load as always returning a constant, e.g. a constant pool |
| 1188 | // load. |
| 1189 | if (mayLoad() && !isDereferenceableInvariantLoad(AA)) |
| 1190 | // Otherwise, this is a real load. If there is a store between the load and |
| 1191 | // end of block, we can't move it. |
| 1192 | return !SawStore; |
| 1193 | |
| 1194 | return true; |
| 1195 | } |
| 1196 | |
| 1197 | bool MachineInstr::mayAlias(AliasAnalysis *AA, const MachineInstr &Other, |
| 1198 | bool UseTBAA) const { |
| 1199 | const MachineFunction *MF = getMF(); |
| 1200 | const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo(); |
| 1201 | const MachineFrameInfo &MFI = MF->getFrameInfo(); |
| 1202 | |
| 1203 | // If neither instruction stores to memory, they can't alias in any |
| 1204 | // meaningful way, even if they read from the same address. |
| 1205 | if (!mayStore() && !Other.mayStore()) |
| 1206 | return false; |
| 1207 | |
| 1208 | // Let the target decide if memory accesses cannot possibly overlap. |
| 1209 | if (TII->areMemAccessesTriviallyDisjoint(*this, Other, AA)) |
| 1210 | return false; |
| 1211 | |
| 1212 | // FIXME: Need to handle multiple memory operands to support all targets. |
| 1213 | if (!hasOneMemOperand() || !Other.hasOneMemOperand()) |
| 1214 | return true; |
| 1215 | |
| 1216 | MachineMemOperand *MMOa = *memoperands_begin(); |
| 1217 | MachineMemOperand *MMOb = *Other.memoperands_begin(); |
| 1218 | |
| 1219 | // The following interface to AA is fashioned after DAGCombiner::isAlias |
| 1220 | // and operates with MachineMemOperand offset with some important |
| 1221 | // assumptions: |
| 1222 | // - LLVM fundamentally assumes flat address spaces. |
| 1223 | // - MachineOperand offset can *only* result from legalization and |
| 1224 | // cannot affect queries other than the trivial case of overlap |
| 1225 | // checking. |
| 1226 | // - These offsets never wrap and never step outside |
| 1227 | // of allocated objects. |
| 1228 | // - There should never be any negative offsets here. |
| 1229 | // |
| 1230 | // FIXME: Modify API to hide this math from "user" |
| 1231 | // Even before we go to AA we can reason locally about some |
| 1232 | // memory objects. It can save compile time, and possibly catch some |
| 1233 | // corner cases not currently covered. |
| 1234 | |
| 1235 | int64_t OffsetA = MMOa->getOffset(); |
| 1236 | int64_t OffsetB = MMOb->getOffset(); |
| 1237 | int64_t MinOffset = std::min(OffsetA, OffsetB); |
| 1238 | |
| 1239 | uint64_t WidthA = MMOa->getSize(); |
| 1240 | uint64_t WidthB = MMOb->getSize(); |
| 1241 | bool KnownWidthA = WidthA != MemoryLocation::UnknownSize; |
| 1242 | bool KnownWidthB = WidthB != MemoryLocation::UnknownSize; |
| 1243 | |
| 1244 | const Value *ValA = MMOa->getValue(); |
| 1245 | const Value *ValB = MMOb->getValue(); |
| 1246 | bool SameVal = (ValA && ValB && (ValA == ValB)); |
| 1247 | if (!SameVal) { |
| 1248 | const PseudoSourceValue *PSVa = MMOa->getPseudoValue(); |
| 1249 | const PseudoSourceValue *PSVb = MMOb->getPseudoValue(); |
| 1250 | if (PSVa && ValB && !PSVa->mayAlias(&MFI)) |
| 1251 | return false; |
| 1252 | if (PSVb && ValA && !PSVb->mayAlias(&MFI)) |
| 1253 | return false; |
| 1254 | if (PSVa && PSVb && (PSVa == PSVb)) |
| 1255 | SameVal = true; |
| 1256 | } |
| 1257 | |
| 1258 | if (SameVal) { |
| 1259 | if (!KnownWidthA || !KnownWidthB) |
| 1260 | return true; |
| 1261 | int64_t MaxOffset = std::max(OffsetA, OffsetB); |
| 1262 | int64_t LowWidth = (MinOffset == OffsetA) ? WidthA : WidthB; |
| 1263 | return (MinOffset + LowWidth > MaxOffset); |
| 1264 | } |
| 1265 | |
| 1266 | if (!AA) |
| 1267 | return true; |
| 1268 | |
| 1269 | if (!ValA || !ValB) |
| 1270 | return true; |
| 1271 | |
| 1272 | assert((OffsetA >= 0) && "Negative MachineMemOperand offset")(((OffsetA >= 0) && "Negative MachineMemOperand offset" ) ? static_cast<void> (0) : __assert_fail ("(OffsetA >= 0) && \"Negative MachineMemOperand offset\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1272, __PRETTY_FUNCTION__)); |
| 1273 | assert((OffsetB >= 0) && "Negative MachineMemOperand offset")(((OffsetB >= 0) && "Negative MachineMemOperand offset" ) ? static_cast<void> (0) : __assert_fail ("(OffsetB >= 0) && \"Negative MachineMemOperand offset\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1273, __PRETTY_FUNCTION__)); |
| 1274 | |
| 1275 | int64_t OverlapA = KnownWidthA ? WidthA + OffsetA - MinOffset |
| 1276 | : MemoryLocation::UnknownSize; |
| 1277 | int64_t OverlapB = KnownWidthB ? WidthB + OffsetB - MinOffset |
| 1278 | : MemoryLocation::UnknownSize; |
| 1279 | |
| 1280 | AliasResult AAResult = AA->alias( |
| 1281 | MemoryLocation(ValA, OverlapA, |
| 1282 | UseTBAA ? MMOa->getAAInfo() : AAMDNodes()), |
| 1283 | MemoryLocation(ValB, OverlapB, |
| 1284 | UseTBAA ? MMOb->getAAInfo() : AAMDNodes())); |
| 1285 | |
| 1286 | return (AAResult != NoAlias); |
| 1287 | } |
| 1288 | |
| 1289 | /// hasOrderedMemoryRef - Return true if this instruction may have an ordered |
| 1290 | /// or volatile memory reference, or if the information describing the memory |
| 1291 | /// reference is not available. Return false if it is known to have no ordered |
| 1292 | /// memory references. |
| 1293 | bool MachineInstr::hasOrderedMemoryRef() const { |
| 1294 | // An instruction known never to access memory won't have a volatile access. |
| 1295 | if (!mayStore() && |
| 1296 | !mayLoad() && |
| 1297 | !isCall() && |
| 1298 | !hasUnmodeledSideEffects()) |
| 1299 | return false; |
| 1300 | |
| 1301 | // Otherwise, if the instruction has no memory reference information, |
| 1302 | // conservatively assume it wasn't preserved. |
| 1303 | if (memoperands_empty()) |
| 1304 | return true; |
| 1305 | |
| 1306 | // Check if any of our memory operands are ordered. |
| 1307 | return llvm::any_of(memoperands(), [](const MachineMemOperand *MMO) { |
| 1308 | return !MMO->isUnordered(); |
| 1309 | }); |
| 1310 | } |
| 1311 | |
| 1312 | /// isDereferenceableInvariantLoad - Return true if this instruction will never |
| 1313 | /// trap and is loading from a location whose value is invariant across a run of |
| 1314 | /// this function. |
| 1315 | bool MachineInstr::isDereferenceableInvariantLoad(AliasAnalysis *AA) const { |
| 1316 | // If the instruction doesn't load at all, it isn't an invariant load. |
| 1317 | if (!mayLoad()) |
| 1318 | return false; |
| 1319 | |
| 1320 | // If the instruction has lost its memoperands, conservatively assume that |
| 1321 | // it may not be an invariant load. |
| 1322 | if (memoperands_empty()) |
| 1323 | return false; |
| 1324 | |
| 1325 | const MachineFrameInfo &MFI = getParent()->getParent()->getFrameInfo(); |
| 1326 | |
| 1327 | for (MachineMemOperand *MMO : memoperands()) { |
| 1328 | if (!MMO->isUnordered()) |
| 1329 | // If the memory operand has ordering side effects, we can't move the |
| 1330 | // instruction. Such an instruction is technically an invariant load, |
| 1331 | // but the caller code would need updated to expect that. |
| 1332 | return false; |
| 1333 | if (MMO->isStore()) return false; |
| 1334 | if (MMO->isInvariant() && MMO->isDereferenceable()) |
| 1335 | continue; |
| 1336 | |
| 1337 | // A load from a constant PseudoSourceValue is invariant. |
| 1338 | if (const PseudoSourceValue *PSV = MMO->getPseudoValue()) |
| 1339 | if (PSV->isConstant(&MFI)) |
| 1340 | continue; |
| 1341 | |
| 1342 | if (const Value *V = MMO->getValue()) { |
| 1343 | // If we have an AliasAnalysis, ask it whether the memory is constant. |
| 1344 | if (AA && |
| 1345 | AA->pointsToConstantMemory( |
| 1346 | MemoryLocation(V, MMO->getSize(), MMO->getAAInfo()))) |
| 1347 | continue; |
| 1348 | } |
| 1349 | |
| 1350 | // Otherwise assume conservatively. |
| 1351 | return false; |
| 1352 | } |
| 1353 | |
| 1354 | // Everything checks out. |
| 1355 | return true; |
| 1356 | } |
| 1357 | |
| 1358 | /// isConstantValuePHI - If the specified instruction is a PHI that always |
| 1359 | /// merges together the same virtual register, return the register, otherwise |
| 1360 | /// return 0. |
| 1361 | unsigned MachineInstr::isConstantValuePHI() const { |
| 1362 | if (!isPHI()) |
| 1363 | return 0; |
| 1364 | assert(getNumOperands() >= 3 &&((getNumOperands() >= 3 && "It's illegal to have a PHI without source operands" ) ? static_cast<void> (0) : __assert_fail ("getNumOperands() >= 3 && \"It's illegal to have a PHI without source operands\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1365, __PRETTY_FUNCTION__)) |
| 1365 | "It's illegal to have a PHI without source operands")((getNumOperands() >= 3 && "It's illegal to have a PHI without source operands" ) ? static_cast<void> (0) : __assert_fail ("getNumOperands() >= 3 && \"It's illegal to have a PHI without source operands\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1365, __PRETTY_FUNCTION__)); |
| 1366 | |
| 1367 | unsigned Reg = getOperand(1).getReg(); |
| 1368 | for (unsigned i = 3, e = getNumOperands(); i < e; i += 2) |
| 1369 | if (getOperand(i).getReg() != Reg) |
| 1370 | return 0; |
| 1371 | return Reg; |
| 1372 | } |
| 1373 | |
| 1374 | bool MachineInstr::hasUnmodeledSideEffects() const { |
| 1375 | if (hasProperty(MCID::UnmodeledSideEffects)) |
| 1376 | return true; |
| 1377 | if (isInlineAsm()) { |
| 1378 | unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); |
| 1379 | if (ExtraInfo & InlineAsm::Extra_HasSideEffects) |
| 1380 | return true; |
| 1381 | } |
| 1382 | |
| 1383 | return false; |
| 1384 | } |
| 1385 | |
| 1386 | bool MachineInstr::isLoadFoldBarrier() const { |
| 1387 | return mayStore() || isCall() || hasUnmodeledSideEffects(); |
| 1388 | } |
| 1389 | |
| 1390 | /// allDefsAreDead - Return true if all the defs of this instruction are dead. |
| 1391 | /// |
| 1392 | bool MachineInstr::allDefsAreDead() const { |
| 1393 | for (const MachineOperand &MO : operands()) { |
| 1394 | if (!MO.isReg() || MO.isUse()) |
| 1395 | continue; |
| 1396 | if (!MO.isDead()) |
| 1397 | return false; |
| 1398 | } |
| 1399 | return true; |
| 1400 | } |
| 1401 | |
| 1402 | /// copyImplicitOps - Copy implicit register operands from specified |
| 1403 | /// instruction to this instruction. |
| 1404 | void MachineInstr::copyImplicitOps(MachineFunction &MF, |
| 1405 | const MachineInstr &MI) { |
| 1406 | for (unsigned i = MI.getDesc().getNumOperands(), e = MI.getNumOperands(); |
| 1407 | i != e; ++i) { |
| 1408 | const MachineOperand &MO = MI.getOperand(i); |
| 1409 | if ((MO.isReg() && MO.isImplicit()) || MO.isRegMask()) |
| 1410 | addOperand(MF, MO); |
| 1411 | } |
| 1412 | } |
| 1413 | |
| 1414 | bool MachineInstr::hasComplexRegisterTies() const { |
| 1415 | const MCInstrDesc &MCID = getDesc(); |
| 1416 | for (unsigned I = 0, E = getNumOperands(); I < E; ++I) { |
| 1417 | const auto &Operand = getOperand(I); |
| 1418 | if (!Operand.isReg() || Operand.isDef()) |
| 1419 | // Ignore the defined registers as MCID marks only the uses as tied. |
| 1420 | continue; |
| 1421 | int ExpectedTiedIdx = MCID.getOperandConstraint(I, MCOI::TIED_TO); |
| 1422 | int TiedIdx = Operand.isTied() ? int(findTiedOperandIdx(I)) : -1; |
| 1423 | if (ExpectedTiedIdx != TiedIdx) |
| 1424 | return true; |
| 1425 | } |
| 1426 | return false; |
| 1427 | } |
| 1428 | |
| 1429 | LLT MachineInstr::getTypeToPrint(unsigned OpIdx, SmallBitVector &PrintedTypes, |
| 1430 | const MachineRegisterInfo &MRI) const { |
| 1431 | const MachineOperand &Op = getOperand(OpIdx); |
| 1432 | if (!Op.isReg()) |
| 1433 | return LLT{}; |
| 1434 | |
| 1435 | if (isVariadic() || OpIdx >= getNumExplicitOperands()) |
| 1436 | return MRI.getType(Op.getReg()); |
| 1437 | |
| 1438 | auto &OpInfo = getDesc().OpInfo[OpIdx]; |
| 1439 | if (!OpInfo.isGenericType()) |
| 1440 | return MRI.getType(Op.getReg()); |
| 1441 | |
| 1442 | if (PrintedTypes[OpInfo.getGenericTypeIndex()]) |
| 1443 | return LLT{}; |
| 1444 | |
| 1445 | LLT TypeToPrint = MRI.getType(Op.getReg()); |
| 1446 | // Don't mark the type index printed if it wasn't actually printed: maybe |
| 1447 | // another operand with the same type index has an actual type attached: |
| 1448 | if (TypeToPrint.isValid()) |
| 1449 | PrintedTypes.set(OpInfo.getGenericTypeIndex()); |
| 1450 | return TypeToPrint; |
| 1451 | } |
| 1452 | |
| 1453 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
| 1454 | LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void MachineInstr::dump() const { |
| 1455 | dbgs() << " "; |
| 1456 | print(dbgs()); |
| 1457 | } |
| 1458 | #endif |
| 1459 | |
| 1460 | void MachineInstr::print(raw_ostream &OS, bool IsStandalone, bool SkipOpers, |
| 1461 | bool SkipDebugLoc, bool AddNewLine, |
| 1462 | const TargetInstrInfo *TII) const { |
| 1463 | const Module *M = nullptr; |
| 1464 | const Function *F = nullptr; |
| 1465 | if (const MachineFunction *MF = getMFIfAvailable(*this)) { |
| 1466 | F = &MF->getFunction(); |
| 1467 | M = F->getParent(); |
| 1468 | if (!TII) |
| 1469 | TII = MF->getSubtarget().getInstrInfo(); |
| 1470 | } |
| 1471 | |
| 1472 | ModuleSlotTracker MST(M); |
| 1473 | if (F) |
| 1474 | MST.incorporateFunction(*F); |
| 1475 | print(OS, MST, IsStandalone, SkipOpers, SkipDebugLoc, AddNewLine, TII); |
| 1476 | } |
| 1477 | |
| 1478 | void MachineInstr::print(raw_ostream &OS, ModuleSlotTracker &MST, |
| 1479 | bool IsStandalone, bool SkipOpers, bool SkipDebugLoc, |
| 1480 | bool AddNewLine, const TargetInstrInfo *TII) const { |
| 1481 | // We can be a bit tidier if we know the MachineFunction. |
| 1482 | const MachineFunction *MF = nullptr; |
| 1483 | const TargetRegisterInfo *TRI = nullptr; |
| 1484 | const MachineRegisterInfo *MRI = nullptr; |
| 1485 | const TargetIntrinsicInfo *IntrinsicInfo = nullptr; |
| 1486 | tryToGetTargetInfo(*this, TRI, MRI, IntrinsicInfo, TII); |
| 1487 | |
| 1488 | if (isCFIInstruction()) |
| 1489 | assert(getNumOperands() == 1 && "Expected 1 operand in CFI instruction")((getNumOperands() == 1 && "Expected 1 operand in CFI instruction" ) ? static_cast<void> (0) : __assert_fail ("getNumOperands() == 1 && \"Expected 1 operand in CFI instruction\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 1489, __PRETTY_FUNCTION__)); |
| 1490 | |
| 1491 | SmallBitVector PrintedTypes(8); |
| 1492 | bool ShouldPrintRegisterTies = IsStandalone || hasComplexRegisterTies(); |
| 1493 | auto getTiedOperandIdx = [&](unsigned OpIdx) { |
| 1494 | if (!ShouldPrintRegisterTies) |
| 1495 | return 0U; |
| 1496 | const MachineOperand &MO = getOperand(OpIdx); |
| 1497 | if (MO.isReg() && MO.isTied() && !MO.isDef()) |
| 1498 | return findTiedOperandIdx(OpIdx); |
| 1499 | return 0U; |
| 1500 | }; |
| 1501 | unsigned StartOp = 0; |
| 1502 | unsigned e = getNumOperands(); |
| 1503 | |
| 1504 | // Print explicitly defined operands on the left of an assignment syntax. |
| 1505 | while (StartOp < e) { |
| 1506 | const MachineOperand &MO = getOperand(StartOp); |
| 1507 | if (!MO.isReg() || !MO.isDef() || MO.isImplicit()) |
| 1508 | break; |
| 1509 | |
| 1510 | if (StartOp != 0) |
| 1511 | OS << ", "; |
| 1512 | |
| 1513 | LLT TypeToPrint = MRI ? getTypeToPrint(StartOp, PrintedTypes, *MRI) : LLT{}; |
| 1514 | unsigned TiedOperandIdx = getTiedOperandIdx(StartOp); |
| 1515 | MO.print(OS, MST, TypeToPrint, /*PrintDef=*/false, IsStandalone, |
| 1516 | ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo); |
| 1517 | ++StartOp; |
| 1518 | } |
| 1519 | |
| 1520 | if (StartOp != 0) |
| 1521 | OS << " = "; |
| 1522 | |
| 1523 | if (getFlag(MachineInstr::FrameSetup)) |
| 1524 | OS << "frame-setup "; |
| 1525 | if (getFlag(MachineInstr::FrameDestroy)) |
| 1526 | OS << "frame-destroy "; |
| 1527 | if (getFlag(MachineInstr::FmNoNans)) |
| 1528 | OS << "nnan "; |
| 1529 | if (getFlag(MachineInstr::FmNoInfs)) |
| 1530 | OS << "ninf "; |
| 1531 | if (getFlag(MachineInstr::FmNsz)) |
| 1532 | OS << "nsz "; |
| 1533 | if (getFlag(MachineInstr::FmArcp)) |
| 1534 | OS << "arcp "; |
| 1535 | if (getFlag(MachineInstr::FmContract)) |
| 1536 | OS << "contract "; |
| 1537 | if (getFlag(MachineInstr::FmAfn)) |
| 1538 | OS << "afn "; |
| 1539 | if (getFlag(MachineInstr::FmReassoc)) |
| 1540 | OS << "reassoc "; |
| 1541 | if (getFlag(MachineInstr::NoUWrap)) |
| 1542 | OS << "nuw "; |
| 1543 | if (getFlag(MachineInstr::NoSWrap)) |
| 1544 | OS << "nsw "; |
| 1545 | if (getFlag(MachineInstr::IsExact)) |
| 1546 | OS << "exact "; |
| 1547 | |
| 1548 | // Print the opcode name. |
| 1549 | if (TII) |
| 1550 | OS << TII->getName(getOpcode()); |
| 1551 | else |
| 1552 | OS << "UNKNOWN"; |
| 1553 | |
| 1554 | if (SkipOpers) |
| 1555 | return; |
| 1556 | |
| 1557 | // Print the rest of the operands. |
| 1558 | bool FirstOp = true; |
| 1559 | unsigned AsmDescOp = ~0u; |
| 1560 | unsigned AsmOpCount = 0; |
| 1561 | |
| 1562 | if (isInlineAsm() && e >= InlineAsm::MIOp_FirstOperand) { |
| 1563 | // Print asm string. |
| 1564 | OS << " "; |
| 1565 | const unsigned OpIdx = InlineAsm::MIOp_AsmString; |
| 1566 | LLT TypeToPrint = MRI ? getTypeToPrint(OpIdx, PrintedTypes, *MRI) : LLT{}; |
| 1567 | unsigned TiedOperandIdx = getTiedOperandIdx(OpIdx); |
| 1568 | getOperand(OpIdx).print(OS, MST, TypeToPrint, /*PrintDef=*/true, IsStandalone, |
| 1569 | ShouldPrintRegisterTies, TiedOperandIdx, TRI, |
| 1570 | IntrinsicInfo); |
| 1571 | |
| 1572 | // Print HasSideEffects, MayLoad, MayStore, IsAlignStack |
| 1573 | unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); |
| 1574 | if (ExtraInfo & InlineAsm::Extra_HasSideEffects) |
| 1575 | OS << " [sideeffect]"; |
| 1576 | if (ExtraInfo & InlineAsm::Extra_MayLoad) |
| 1577 | OS << " [mayload]"; |
| 1578 | if (ExtraInfo & InlineAsm::Extra_MayStore) |
| 1579 | OS << " [maystore]"; |
| 1580 | if (ExtraInfo & InlineAsm::Extra_IsConvergent) |
| 1581 | OS << " [isconvergent]"; |
| 1582 | if (ExtraInfo & InlineAsm::Extra_IsAlignStack) |
| 1583 | OS << " [alignstack]"; |
| 1584 | if (getInlineAsmDialect() == InlineAsm::AD_ATT) |
| 1585 | OS << " [attdialect]"; |
| 1586 | if (getInlineAsmDialect() == InlineAsm::AD_Intel) |
| 1587 | OS << " [inteldialect]"; |
| 1588 | |
| 1589 | StartOp = AsmDescOp = InlineAsm::MIOp_FirstOperand; |
| 1590 | FirstOp = false; |
| 1591 | } |
| 1592 | |
| 1593 | for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) { |
| 1594 | const MachineOperand &MO = getOperand(i); |
| 1595 | |
| 1596 | if (FirstOp) FirstOp = false; else OS << ","; |
| 1597 | OS << " "; |
| 1598 | |
| 1599 | if (isDebugValue() && MO.isMetadata()) { |
| 1600 | // Pretty print DBG_VALUE instructions. |
| 1601 | auto *DIV = dyn_cast<DILocalVariable>(MO.getMetadata()); |
| 1602 | if (DIV && !DIV->getName().empty()) |
| 1603 | OS << "!\"" << DIV->getName() << '\"'; |
| 1604 | else { |
| 1605 | LLT TypeToPrint = MRI ? getTypeToPrint(i, PrintedTypes, *MRI) : LLT{}; |
| 1606 | unsigned TiedOperandIdx = getTiedOperandIdx(i); |
| 1607 | MO.print(OS, MST, TypeToPrint, /*PrintDef=*/true, IsStandalone, |
| 1608 | ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo); |
| 1609 | } |
| 1610 | } else if (isDebugLabel() && MO.isMetadata()) { |
| 1611 | // Pretty print DBG_LABEL instructions. |
| 1612 | auto *DIL = dyn_cast<DILabel>(MO.getMetadata()); |
| 1613 | if (DIL && !DIL->getName().empty()) |
| 1614 | OS << "\"" << DIL->getName() << '\"'; |
| 1615 | else { |
| 1616 | LLT TypeToPrint = MRI ? getTypeToPrint(i, PrintedTypes, *MRI) : LLT{}; |
| 1617 | unsigned TiedOperandIdx = getTiedOperandIdx(i); |
| 1618 | MO.print(OS, MST, TypeToPrint, /*PrintDef=*/true, IsStandalone, |
| 1619 | ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo); |
| 1620 | } |
| 1621 | } else if (i == AsmDescOp && MO.isImm()) { |
| 1622 | // Pretty print the inline asm operand descriptor. |
| 1623 | OS << '$' << AsmOpCount++; |
| 1624 | unsigned Flag = MO.getImm(); |
| 1625 | switch (InlineAsm::getKind(Flag)) { |
| 1626 | case InlineAsm::Kind_RegUse: OS << ":[reguse"; break; |
| 1627 | case InlineAsm::Kind_RegDef: OS << ":[regdef"; break; |
| 1628 | case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec"; break; |
| 1629 | case InlineAsm::Kind_Clobber: OS << ":[clobber"; break; |
| 1630 | case InlineAsm::Kind_Imm: OS << ":[imm"; break; |
| 1631 | case InlineAsm::Kind_Mem: OS << ":[mem"; break; |
| 1632 | default: OS << ":[??" << InlineAsm::getKind(Flag); break; |
| 1633 | } |
| 1634 | |
| 1635 | unsigned RCID = 0; |
| 1636 | if (!InlineAsm::isImmKind(Flag) && !InlineAsm::isMemKind(Flag) && |
| 1637 | InlineAsm::hasRegClassConstraint(Flag, RCID)) { |
| 1638 | if (TRI) { |
| 1639 | OS << ':' << TRI->getRegClassName(TRI->getRegClass(RCID)); |
| 1640 | } else |
| 1641 | OS << ":RC" << RCID; |
| 1642 | } |
| 1643 | |
| 1644 | if (InlineAsm::isMemKind(Flag)) { |
| 1645 | unsigned MCID = InlineAsm::getMemoryConstraintID(Flag); |
| 1646 | switch (MCID) { |
| 1647 | case InlineAsm::Constraint_es: OS << ":es"; break; |
| 1648 | case InlineAsm::Constraint_i: OS << ":i"; break; |
| 1649 | case InlineAsm::Constraint_m: OS << ":m"; break; |
| 1650 | case InlineAsm::Constraint_o: OS << ":o"; break; |
| 1651 | case InlineAsm::Constraint_v: OS << ":v"; break; |
| 1652 | case InlineAsm::Constraint_Q: OS << ":Q"; break; |
| 1653 | case InlineAsm::Constraint_R: OS << ":R"; break; |
| 1654 | case InlineAsm::Constraint_S: OS << ":S"; break; |
| 1655 | case InlineAsm::Constraint_T: OS << ":T"; break; |
| 1656 | case InlineAsm::Constraint_Um: OS << ":Um"; break; |
| 1657 | case InlineAsm::Constraint_Un: OS << ":Un"; break; |
| 1658 | case InlineAsm::Constraint_Uq: OS << ":Uq"; break; |
| 1659 | case InlineAsm::Constraint_Us: OS << ":Us"; break; |
| 1660 | case InlineAsm::Constraint_Ut: OS << ":Ut"; break; |
| 1661 | case InlineAsm::Constraint_Uv: OS << ":Uv"; break; |
| 1662 | case InlineAsm::Constraint_Uy: OS << ":Uy"; break; |
| 1663 | case InlineAsm::Constraint_X: OS << ":X"; break; |
| 1664 | case InlineAsm::Constraint_Z: OS << ":Z"; break; |
| 1665 | case InlineAsm::Constraint_ZC: OS << ":ZC"; break; |
| 1666 | case InlineAsm::Constraint_Zy: OS << ":Zy"; break; |
| 1667 | default: OS << ":?"; break; |
| 1668 | } |
| 1669 | } |
| 1670 | |
| 1671 | unsigned TiedTo = 0; |
| 1672 | if (InlineAsm::isUseOperandTiedToDef(Flag, TiedTo)) |
| 1673 | OS << " tiedto:$" << TiedTo; |
| 1674 | |
| 1675 | OS << ']'; |
| 1676 | |
| 1677 | // Compute the index of the next operand descriptor. |
| 1678 | AsmDescOp += 1 + InlineAsm::getNumOperandRegisters(Flag); |
| 1679 | } else { |
| 1680 | LLT TypeToPrint = MRI ? getTypeToPrint(i, PrintedTypes, *MRI) : LLT{}; |
| 1681 | unsigned TiedOperandIdx = getTiedOperandIdx(i); |
| 1682 | if (MO.isImm() && isOperandSubregIdx(i)) |
| 1683 | MachineOperand::printSubRegIdx(OS, MO.getImm(), TRI); |
| 1684 | else |
| 1685 | MO.print(OS, MST, TypeToPrint, /*PrintDef=*/true, IsStandalone, |
| 1686 | ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo); |
| 1687 | } |
| 1688 | } |
| 1689 | |
| 1690 | // Print any optional symbols attached to this instruction as-if they were |
| 1691 | // operands. |
| 1692 | if (MCSymbol *PreInstrSymbol = getPreInstrSymbol()) { |
| 1693 | if (!FirstOp) { |
| 1694 | FirstOp = false; |
| 1695 | OS << ','; |
| 1696 | } |
| 1697 | OS << " pre-instr-symbol "; |
| 1698 | MachineOperand::printSymbol(OS, *PreInstrSymbol); |
| 1699 | } |
| 1700 | if (MCSymbol *PostInstrSymbol = getPostInstrSymbol()) { |
| 1701 | if (!FirstOp) { |
| 1702 | FirstOp = false; |
| 1703 | OS << ','; |
| 1704 | } |
| 1705 | OS << " post-instr-symbol "; |
| 1706 | MachineOperand::printSymbol(OS, *PostInstrSymbol); |
| 1707 | } |
| 1708 | |
| 1709 | if (!SkipDebugLoc) { |
| 1710 | if (const DebugLoc &DL = getDebugLoc()) { |
| 1711 | if (!FirstOp) |
| 1712 | OS << ','; |
| 1713 | OS << " debug-location "; |
| 1714 | DL->printAsOperand(OS, MST); |
| 1715 | } |
| 1716 | } |
| 1717 | |
| 1718 | if (!memoperands_empty()) { |
| 1719 | SmallVector<StringRef, 0> SSNs; |
| 1720 | const LLVMContext *Context = nullptr; |
| 1721 | std::unique_ptr<LLVMContext> CtxPtr; |
| 1722 | const MachineFrameInfo *MFI = nullptr; |
| 1723 | if (const MachineFunction *MF = getMFIfAvailable(*this)) { |
| 1724 | MFI = &MF->getFrameInfo(); |
| 1725 | Context = &MF->getFunction().getContext(); |
| 1726 | } else { |
| 1727 | CtxPtr = llvm::make_unique<LLVMContext>(); |
| 1728 | Context = CtxPtr.get(); |
| 1729 | } |
| 1730 | |
| 1731 | OS << " :: "; |
| 1732 | bool NeedComma = false; |
| 1733 | for (const MachineMemOperand *Op : memoperands()) { |
| 1734 | if (NeedComma) |
| 1735 | OS << ", "; |
| 1736 | Op->print(OS, MST, SSNs, *Context, MFI, TII); |
| 1737 | NeedComma = true; |
| 1738 | } |
| 1739 | } |
| 1740 | |
| 1741 | if (SkipDebugLoc) |
| 1742 | return; |
| 1743 | |
| 1744 | bool HaveSemi = false; |
| 1745 | |
| 1746 | // Print debug location information. |
| 1747 | if (const DebugLoc &DL = getDebugLoc()) { |
| 1748 | if (!HaveSemi) { |
| 1749 | OS << ';'; |
| 1750 | HaveSemi = true; |
| 1751 | } |
| 1752 | OS << ' '; |
| 1753 | DL.print(OS); |
| 1754 | } |
| 1755 | |
| 1756 | // Print extra comments for DEBUG_VALUE. |
| 1757 | if (isDebugValue() && getOperand(e - 2).isMetadata()) { |
| 1758 | if (!HaveSemi) { |
| 1759 | OS << ";"; |
| 1760 | HaveSemi = true; |
Value stored to 'HaveSemi' is never read | |
| 1761 | } |
| 1762 | auto *DV = cast<DILocalVariable>(getOperand(e - 2).getMetadata()); |
| 1763 | OS << " line no:" << DV->getLine(); |
| 1764 | if (auto *InlinedAt = debugLoc->getInlinedAt()) { |
| 1765 | DebugLoc InlinedAtDL(InlinedAt); |
| 1766 | if (InlinedAtDL && MF) { |
| 1767 | OS << " inlined @[ "; |
| 1768 | InlinedAtDL.print(OS); |
| 1769 | OS << " ]"; |
| 1770 | } |
| 1771 | } |
| 1772 | if (isIndirectDebugValue()) |
| 1773 | OS << " indirect"; |
| 1774 | } |
| 1775 | // TODO: DBG_LABEL |
| 1776 | |
| 1777 | if (AddNewLine) |
| 1778 | OS << '\n'; |
| 1779 | } |
| 1780 | |
| 1781 | bool MachineInstr::addRegisterKilled(unsigned IncomingReg, |
| 1782 | const TargetRegisterInfo *RegInfo, |
| 1783 | bool AddIfNotFound) { |
| 1784 | bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg); |
| 1785 | bool hasAliases = isPhysReg && |
| 1786 | MCRegAliasIterator(IncomingReg, RegInfo, false).isValid(); |
| 1787 | bool Found = false; |
| 1788 | SmallVector<unsigned,4> DeadOps; |
| 1789 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { |
| 1790 | MachineOperand &MO = getOperand(i); |
| 1791 | if (!MO.isReg() || !MO.isUse() || MO.isUndef()) |
| 1792 | continue; |
| 1793 | |
| 1794 | // DEBUG_VALUE nodes do not contribute to code generation and should |
| 1795 | // always be ignored. Failure to do so may result in trying to modify |
| 1796 | // KILL flags on DEBUG_VALUE nodes. |
| 1797 | if (MO.isDebug()) |
| 1798 | continue; |
| 1799 | |
| 1800 | unsigned Reg = MO.getReg(); |
| 1801 | if (!Reg) |
| 1802 | continue; |
| 1803 | |
| 1804 | if (Reg == IncomingReg) { |
| 1805 | if (!Found) { |
| 1806 | if (MO.isKill()) |
| 1807 | // The register is already marked kill. |
| 1808 | return true; |
| 1809 | if (isPhysReg && isRegTiedToDefOperand(i)) |
| 1810 | // Two-address uses of physregs must not be marked kill. |
| 1811 | return true; |
| 1812 | MO.setIsKill(); |
| 1813 | Found = true; |
| 1814 | } |
| 1815 | } else if (hasAliases && MO.isKill() && |
| 1816 | TargetRegisterInfo::isPhysicalRegister(Reg)) { |
| 1817 | // A super-register kill already exists. |
| 1818 | if (RegInfo->isSuperRegister(IncomingReg, Reg)) |
| 1819 | return true; |
| 1820 | if (RegInfo->isSubRegister(IncomingReg, Reg)) |
| 1821 | DeadOps.push_back(i); |
| 1822 | } |
| 1823 | } |
| 1824 | |
| 1825 | // Trim unneeded kill operands. |
| 1826 | while (!DeadOps.empty()) { |
| 1827 | unsigned OpIdx = DeadOps.back(); |
| 1828 | if (getOperand(OpIdx).isImplicit() && |
| 1829 | (!isInlineAsm() || findInlineAsmFlagIdx(OpIdx) < 0)) |
| 1830 | RemoveOperand(OpIdx); |
| 1831 | else |
| 1832 | getOperand(OpIdx).setIsKill(false); |
| 1833 | DeadOps.pop_back(); |
| 1834 | } |
| 1835 | |
| 1836 | // If not found, this means an alias of one of the operands is killed. Add a |
| 1837 | // new implicit operand if required. |
| 1838 | if (!Found && AddIfNotFound) { |
| 1839 | addOperand(MachineOperand::CreateReg(IncomingReg, |
| 1840 | false /*IsDef*/, |
| 1841 | true /*IsImp*/, |
| 1842 | true /*IsKill*/)); |
| 1843 | return true; |
| 1844 | } |
| 1845 | return Found; |
| 1846 | } |
| 1847 | |
| 1848 | void MachineInstr::clearRegisterKills(unsigned Reg, |
| 1849 | const TargetRegisterInfo *RegInfo) { |
| 1850 | if (!TargetRegisterInfo::isPhysicalRegister(Reg)) |
| 1851 | RegInfo = nullptr; |
| 1852 | for (MachineOperand &MO : operands()) { |
| 1853 | if (!MO.isReg() || !MO.isUse() || !MO.isKill()) |
| 1854 | continue; |
| 1855 | unsigned OpReg = MO.getReg(); |
| 1856 | if ((RegInfo && RegInfo->regsOverlap(Reg, OpReg)) || Reg == OpReg) |
| 1857 | MO.setIsKill(false); |
| 1858 | } |
| 1859 | } |
| 1860 | |
| 1861 | bool MachineInstr::addRegisterDead(unsigned Reg, |
| 1862 | const TargetRegisterInfo *RegInfo, |
| 1863 | bool AddIfNotFound) { |
| 1864 | bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(Reg); |
| 1865 | bool hasAliases = isPhysReg && |
| 1866 | MCRegAliasIterator(Reg, RegInfo, false).isValid(); |
| 1867 | bool Found = false; |
| 1868 | SmallVector<unsigned,4> DeadOps; |
| 1869 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { |
| 1870 | MachineOperand &MO = getOperand(i); |
| 1871 | if (!MO.isReg() || !MO.isDef()) |
| 1872 | continue; |
| 1873 | unsigned MOReg = MO.getReg(); |
| 1874 | if (!MOReg) |
| 1875 | continue; |
| 1876 | |
| 1877 | if (MOReg == Reg) { |
| 1878 | MO.setIsDead(); |
| 1879 | Found = true; |
| 1880 | } else if (hasAliases && MO.isDead() && |
| 1881 | TargetRegisterInfo::isPhysicalRegister(MOReg)) { |
| 1882 | // There exists a super-register that's marked dead. |
| 1883 | if (RegInfo->isSuperRegister(Reg, MOReg)) |
| 1884 | return true; |
| 1885 | if (RegInfo->isSubRegister(Reg, MOReg)) |
| 1886 | DeadOps.push_back(i); |
| 1887 | } |
| 1888 | } |
| 1889 | |
| 1890 | // Trim unneeded dead operands. |
| 1891 | while (!DeadOps.empty()) { |
| 1892 | unsigned OpIdx = DeadOps.back(); |
| 1893 | if (getOperand(OpIdx).isImplicit() && |
| 1894 | (!isInlineAsm() || findInlineAsmFlagIdx(OpIdx) < 0)) |
| 1895 | RemoveOperand(OpIdx); |
| 1896 | else |
| 1897 | getOperand(OpIdx).setIsDead(false); |
| 1898 | DeadOps.pop_back(); |
| 1899 | } |
| 1900 | |
| 1901 | // If not found, this means an alias of one of the operands is dead. Add a |
| 1902 | // new implicit operand if required. |
| 1903 | if (Found || !AddIfNotFound) |
| 1904 | return Found; |
| 1905 | |
| 1906 | addOperand(MachineOperand::CreateReg(Reg, |
| 1907 | true /*IsDef*/, |
| 1908 | true /*IsImp*/, |
| 1909 | false /*IsKill*/, |
| 1910 | true /*IsDead*/)); |
| 1911 | return true; |
| 1912 | } |
| 1913 | |
| 1914 | void MachineInstr::clearRegisterDeads(unsigned Reg) { |
| 1915 | for (MachineOperand &MO : operands()) { |
| 1916 | if (!MO.isReg() || !MO.isDef() || MO.getReg() != Reg) |
| 1917 | continue; |
| 1918 | MO.setIsDead(false); |
| 1919 | } |
| 1920 | } |
| 1921 | |
| 1922 | void MachineInstr::setRegisterDefReadUndef(unsigned Reg, bool IsUndef) { |
| 1923 | for (MachineOperand &MO : operands()) { |
| 1924 | if (!MO.isReg() || !MO.isDef() || MO.getReg() != Reg || MO.getSubReg() == 0) |
| 1925 | continue; |
| 1926 | MO.setIsUndef(IsUndef); |
| 1927 | } |
| 1928 | } |
| 1929 | |
| 1930 | void MachineInstr::addRegisterDefined(unsigned Reg, |
| 1931 | const TargetRegisterInfo *RegInfo) { |
| 1932 | if (TargetRegisterInfo::isPhysicalRegister(Reg)) { |
| 1933 | MachineOperand *MO = findRegisterDefOperand(Reg, false, false, RegInfo); |
| 1934 | if (MO) |
| 1935 | return; |
| 1936 | } else { |
| 1937 | for (const MachineOperand &MO : operands()) { |
| 1938 | if (MO.isReg() && MO.getReg() == Reg && MO.isDef() && |
| 1939 | MO.getSubReg() == 0) |
| 1940 | return; |
| 1941 | } |
| 1942 | } |
| 1943 | addOperand(MachineOperand::CreateReg(Reg, |
| 1944 | true /*IsDef*/, |
| 1945 | true /*IsImp*/)); |
| 1946 | } |
| 1947 | |
| 1948 | void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs, |
| 1949 | const TargetRegisterInfo &TRI) { |
| 1950 | bool HasRegMask = false; |
| 1951 | for (MachineOperand &MO : operands()) { |
| 1952 | if (MO.isRegMask()) { |
| 1953 | HasRegMask = true; |
| 1954 | continue; |
| 1955 | } |
| 1956 | if (!MO.isReg() || !MO.isDef()) continue; |
| 1957 | unsigned Reg = MO.getReg(); |
| 1958 | if (!TargetRegisterInfo::isPhysicalRegister(Reg)) continue; |
| 1959 | // If there are no uses, including partial uses, the def is dead. |
| 1960 | if (llvm::none_of(UsedRegs, |
| 1961 | [&](unsigned Use) { return TRI.regsOverlap(Use, Reg); })) |
| 1962 | MO.setIsDead(); |
| 1963 | } |
| 1964 | |
| 1965 | // This is a call with a register mask operand. |
| 1966 | // Mask clobbers are always dead, so add defs for the non-dead defines. |
| 1967 | if (HasRegMask) |
| 1968 | for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end(); |
| 1969 | I != E; ++I) |
| 1970 | addRegisterDefined(*I, &TRI); |
| 1971 | } |
| 1972 | |
| 1973 | unsigned |
| 1974 | MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) { |
| 1975 | // Build up a buffer of hash code components. |
| 1976 | SmallVector<size_t, 8> HashComponents; |
| 1977 | HashComponents.reserve(MI->getNumOperands() + 1); |
| 1978 | HashComponents.push_back(MI->getOpcode()); |
| 1979 | for (const MachineOperand &MO : MI->operands()) { |
| 1980 | if (MO.isReg() && MO.isDef() && |
| 1981 | TargetRegisterInfo::isVirtualRegister(MO.getReg())) |
| 1982 | continue; // Skip virtual register defs. |
| 1983 | |
| 1984 | HashComponents.push_back(hash_value(MO)); |
| 1985 | } |
| 1986 | return hash_combine_range(HashComponents.begin(), HashComponents.end()); |
| 1987 | } |
| 1988 | |
| 1989 | void MachineInstr::emitError(StringRef Msg) const { |
| 1990 | // Find the source location cookie. |
| 1991 | unsigned LocCookie = 0; |
| 1992 | const MDNode *LocMD = nullptr; |
| 1993 | for (unsigned i = getNumOperands(); i != 0; --i) { |
| 1994 | if (getOperand(i-1).isMetadata() && |
| 1995 | (LocMD = getOperand(i-1).getMetadata()) && |
| 1996 | LocMD->getNumOperands() != 0) { |
| 1997 | if (const ConstantInt *CI = |
| 1998 | mdconst::dyn_extract<ConstantInt>(LocMD->getOperand(0))) { |
| 1999 | LocCookie = CI->getZExtValue(); |
| 2000 | break; |
| 2001 | } |
| 2002 | } |
| 2003 | } |
| 2004 | |
| 2005 | if (const MachineBasicBlock *MBB = getParent()) |
| 2006 | if (const MachineFunction *MF = MBB->getParent()) |
| 2007 | return MF->getMMI().getModule()->getContext().emitError(LocCookie, Msg); |
| 2008 | report_fatal_error(Msg); |
| 2009 | } |
| 2010 | |
| 2011 | MachineInstrBuilder llvm::BuildMI(MachineFunction &MF, const DebugLoc &DL, |
| 2012 | const MCInstrDesc &MCID, bool IsIndirect, |
| 2013 | unsigned Reg, const MDNode *Variable, |
| 2014 | const MDNode *Expr) { |
| 2015 | assert(isa<DILocalVariable>(Variable) && "not a variable")((isa<DILocalVariable>(Variable) && "not a variable" ) ? static_cast<void> (0) : __assert_fail ("isa<DILocalVariable>(Variable) && \"not a variable\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2015, __PRETTY_FUNCTION__)); |
| 2016 | assert(cast<DIExpression>(Expr)->isValid() && "not an expression")((cast<DIExpression>(Expr)->isValid() && "not an expression" ) ? static_cast<void> (0) : __assert_fail ("cast<DIExpression>(Expr)->isValid() && \"not an expression\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2016, __PRETTY_FUNCTION__)); |
| 2017 | assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&((cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic (DL) && "Expected inlined-at fields to agree") ? static_cast <void> (0) : __assert_fail ("cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2018, __PRETTY_FUNCTION__)) |
| 2018 | "Expected inlined-at fields to agree")((cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic (DL) && "Expected inlined-at fields to agree") ? static_cast <void> (0) : __assert_fail ("cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2018, __PRETTY_FUNCTION__)); |
| 2019 | auto MIB = BuildMI(MF, DL, MCID).addReg(Reg, RegState::Debug); |
| 2020 | if (IsIndirect) |
| 2021 | MIB.addImm(0U); |
| 2022 | else |
| 2023 | MIB.addReg(0U, RegState::Debug); |
| 2024 | return MIB.addMetadata(Variable).addMetadata(Expr); |
| 2025 | } |
| 2026 | |
| 2027 | MachineInstrBuilder llvm::BuildMI(MachineFunction &MF, const DebugLoc &DL, |
| 2028 | const MCInstrDesc &MCID, bool IsIndirect, |
| 2029 | MachineOperand &MO, const MDNode *Variable, |
| 2030 | const MDNode *Expr) { |
| 2031 | assert(isa<DILocalVariable>(Variable) && "not a variable")((isa<DILocalVariable>(Variable) && "not a variable" ) ? static_cast<void> (0) : __assert_fail ("isa<DILocalVariable>(Variable) && \"not a variable\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2031, __PRETTY_FUNCTION__)); |
| 2032 | assert(cast<DIExpression>(Expr)->isValid() && "not an expression")((cast<DIExpression>(Expr)->isValid() && "not an expression" ) ? static_cast<void> (0) : __assert_fail ("cast<DIExpression>(Expr)->isValid() && \"not an expression\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2032, __PRETTY_FUNCTION__)); |
| 2033 | assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&((cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic (DL) && "Expected inlined-at fields to agree") ? static_cast <void> (0) : __assert_fail ("cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2034, __PRETTY_FUNCTION__)) |
| 2034 | "Expected inlined-at fields to agree")((cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic (DL) && "Expected inlined-at fields to agree") ? static_cast <void> (0) : __assert_fail ("cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2034, __PRETTY_FUNCTION__)); |
| 2035 | if (MO.isReg()) |
| 2036 | return BuildMI(MF, DL, MCID, IsIndirect, MO.getReg(), Variable, Expr); |
| 2037 | |
| 2038 | auto MIB = BuildMI(MF, DL, MCID).add(MO); |
| 2039 | if (IsIndirect) |
| 2040 | MIB.addImm(0U); |
| 2041 | else |
| 2042 | MIB.addReg(0U, RegState::Debug); |
| 2043 | return MIB.addMetadata(Variable).addMetadata(Expr); |
| 2044 | } |
| 2045 | |
| 2046 | MachineInstrBuilder llvm::BuildMI(MachineBasicBlock &BB, |
| 2047 | MachineBasicBlock::iterator I, |
| 2048 | const DebugLoc &DL, const MCInstrDesc &MCID, |
| 2049 | bool IsIndirect, unsigned Reg, |
| 2050 | const MDNode *Variable, const MDNode *Expr) { |
| 2051 | MachineFunction &MF = *BB.getParent(); |
| 2052 | MachineInstr *MI = BuildMI(MF, DL, MCID, IsIndirect, Reg, Variable, Expr); |
| 2053 | BB.insert(I, MI); |
| 2054 | return MachineInstrBuilder(MF, MI); |
| 2055 | } |
| 2056 | |
| 2057 | MachineInstrBuilder llvm::BuildMI(MachineBasicBlock &BB, |
| 2058 | MachineBasicBlock::iterator I, |
| 2059 | const DebugLoc &DL, const MCInstrDesc &MCID, |
| 2060 | bool IsIndirect, MachineOperand &MO, |
| 2061 | const MDNode *Variable, const MDNode *Expr) { |
| 2062 | MachineFunction &MF = *BB.getParent(); |
| 2063 | MachineInstr *MI = BuildMI(MF, DL, MCID, IsIndirect, MO, Variable, Expr); |
| 2064 | BB.insert(I, MI); |
| 2065 | return MachineInstrBuilder(MF, *MI); |
| 2066 | } |
| 2067 | |
| 2068 | /// Compute the new DIExpression to use with a DBG_VALUE for a spill slot. |
| 2069 | /// This prepends DW_OP_deref when spilling an indirect DBG_VALUE. |
| 2070 | static const DIExpression *computeExprForSpill(const MachineInstr &MI) { |
| 2071 | assert(MI.getOperand(0).isReg() && "can't spill non-register")((MI.getOperand(0).isReg() && "can't spill non-register" ) ? static_cast<void> (0) : __assert_fail ("MI.getOperand(0).isReg() && \"can't spill non-register\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2071, __PRETTY_FUNCTION__)); |
| 2072 | assert(MI.getDebugVariable()->isValidLocationForIntrinsic(MI.getDebugLoc()) &&((MI.getDebugVariable()->isValidLocationForIntrinsic(MI.getDebugLoc ()) && "Expected inlined-at fields to agree") ? static_cast <void> (0) : __assert_fail ("MI.getDebugVariable()->isValidLocationForIntrinsic(MI.getDebugLoc()) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2073, __PRETTY_FUNCTION__)) |
| 2073 | "Expected inlined-at fields to agree")((MI.getDebugVariable()->isValidLocationForIntrinsic(MI.getDebugLoc ()) && "Expected inlined-at fields to agree") ? static_cast <void> (0) : __assert_fail ("MI.getDebugVariable()->isValidLocationForIntrinsic(MI.getDebugLoc()) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2073, __PRETTY_FUNCTION__)); |
| 2074 | |
| 2075 | const DIExpression *Expr = MI.getDebugExpression(); |
| 2076 | if (MI.isIndirectDebugValue()) { |
| 2077 | assert(MI.getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset")((MI.getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset" ) ? static_cast<void> (0) : __assert_fail ("MI.getOperand(1).getImm() == 0 && \"DBG_VALUE with nonzero offset\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/MachineInstr.cpp" , 2077, __PRETTY_FUNCTION__)); |
| 2078 | Expr = DIExpression::prepend(Expr, DIExpression::DerefBefore); |
| 2079 | } |
| 2080 | return Expr; |
| 2081 | } |
| 2082 | |
| 2083 | MachineInstr *llvm::buildDbgValueForSpill(MachineBasicBlock &BB, |
| 2084 | MachineBasicBlock::iterator I, |
| 2085 | const MachineInstr &Orig, |
| 2086 | int FrameIndex) { |
| 2087 | const DIExpression *Expr = computeExprForSpill(Orig); |
| 2088 | return BuildMI(BB, I, Orig.getDebugLoc(), Orig.getDesc()) |
| 2089 | .addFrameIndex(FrameIndex) |
| 2090 | .addImm(0U) |
| 2091 | .addMetadata(Orig.getDebugVariable()) |
| 2092 | .addMetadata(Expr); |
| 2093 | } |
| 2094 | |
| 2095 | void llvm::updateDbgValueForSpill(MachineInstr &Orig, int FrameIndex) { |
| 2096 | const DIExpression *Expr = computeExprForSpill(Orig); |
| 2097 | Orig.getOperand(0).ChangeToFrameIndex(FrameIndex); |
| 2098 | Orig.getOperand(1).ChangeToImmediate(0U); |
| 2099 | Orig.getOperand(3).setMetadata(Expr); |
| 2100 | } |
| 2101 | |
| 2102 | void MachineInstr::collectDebugValues( |
| 2103 | SmallVectorImpl<MachineInstr *> &DbgValues) { |
| 2104 | MachineInstr &MI = *this; |
| 2105 | if (!MI.getOperand(0).isReg()) |
| 2106 | return; |
| 2107 | |
| 2108 | MachineBasicBlock::iterator DI = MI; ++DI; |
| 2109 | for (MachineBasicBlock::iterator DE = MI.getParent()->end(); |
| 2110 | DI != DE; ++DI) { |
| 2111 | if (!DI->isDebugValue()) |
| 2112 | return; |
| 2113 | if (DI->getOperand(0).isReg() && |
| 2114 | DI->getOperand(0).getReg() == MI.getOperand(0).getReg()) |
| 2115 | DbgValues.push_back(&*DI); |
| 2116 | } |
| 2117 | } |
| 2118 | |
| 2119 | void MachineInstr::changeDebugValuesDefReg(unsigned Reg) { |
| 2120 | // Collect matching debug values. |
| 2121 | SmallVector<MachineInstr *, 2> DbgValues; |
| 2122 | collectDebugValues(DbgValues); |
| 2123 | |
| 2124 | // Propagate Reg to debug value instructions. |
| 2125 | for (auto *DBI : DbgValues) |
| 2126 | DBI->getOperand(0).setReg(Reg); |
| 2127 | } |
| 2128 | |
| 2129 | using MMOList = SmallVector<const MachineMemOperand *, 2>; |
| 2130 | |
| 2131 | static unsigned getSpillSlotSize(MMOList &Accesses, |
| 2132 | const MachineFrameInfo &MFI) { |
| 2133 | unsigned Size = 0; |
| 2134 | for (auto A : Accesses) |
| 2135 | if (MFI.isSpillSlotObjectIndex( |
| 2136 | cast<FixedStackPseudoSourceValue>(A->getPseudoValue()) |
| 2137 | ->getFrameIndex())) |
| 2138 | Size += A->getSize(); |
| 2139 | return Size; |
| 2140 | } |
| 2141 | |
| 2142 | Optional<unsigned> |
| 2143 | MachineInstr::getSpillSize(const TargetInstrInfo *TII) const { |
| 2144 | int FI; |
| 2145 | if (TII->isStoreToStackSlotPostFE(*this, FI)) { |
| 2146 | const MachineFrameInfo &MFI = getMF()->getFrameInfo(); |
| 2147 | if (MFI.isSpillSlotObjectIndex(FI)) |
| 2148 | return (*memoperands_begin())->getSize(); |
| 2149 | } |
| 2150 | return None; |
| 2151 | } |
| 2152 | |
| 2153 | Optional<unsigned> |
| 2154 | MachineInstr::getFoldedSpillSize(const TargetInstrInfo *TII) const { |
| 2155 | MMOList Accesses; |
| 2156 | if (TII->hasStoreToStackSlot(*this, Accesses)) |
| 2157 | return getSpillSlotSize(Accesses, getMF()->getFrameInfo()); |
| 2158 | return None; |
| 2159 | } |
| 2160 | |
| 2161 | Optional<unsigned> |
| 2162 | MachineInstr::getRestoreSize(const TargetInstrInfo *TII) const { |
| 2163 | int FI; |
| 2164 | if (TII->isLoadFromStackSlotPostFE(*this, FI)) { |
| 2165 | const MachineFrameInfo &MFI = getMF()->getFrameInfo(); |
| 2166 | if (MFI.isSpillSlotObjectIndex(FI)) |
| 2167 | return (*memoperands_begin())->getSize(); |
| 2168 | } |
| 2169 | return None; |
| 2170 | } |
| 2171 | |
| 2172 | Optional<unsigned> |
| 2173 | MachineInstr::getFoldedRestoreSize(const TargetInstrInfo *TII) const { |
| 2174 | MMOList Accesses; |
| 2175 | if (TII->hasLoadFromStackSlot(*this, Accesses)) |
| 2176 | return getSpillSlotSize(Accesses, getMF()->getFrameInfo()); |
| 2177 | return None; |
| 2178 | } |