| File: | llvm/lib/Transforms/Scalar/LICM.cpp |
| Warning: | line 1207, column 33 Called C++ object pointer is null |
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| 1 | //===-- LICM.cpp - Loop Invariant Code Motion Pass ------------------------===// | ||||||||
| 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 | // This pass performs loop invariant code motion, attempting to remove as much | ||||||||
| 10 | // code from the body of a loop as possible. It does this by either hoisting | ||||||||
| 11 | // code into the preheader block, or by sinking code to the exit blocks if it is | ||||||||
| 12 | // safe. This pass also promotes must-aliased memory locations in the loop to | ||||||||
| 13 | // live in registers, thus hoisting and sinking "invariant" loads and stores. | ||||||||
| 14 | // | ||||||||
| 15 | // Hoisting operations out of loops is a canonicalization transform. It | ||||||||
| 16 | // enables and simplifies subsequent optimizations in the middle-end. | ||||||||
| 17 | // Rematerialization of hoisted instructions to reduce register pressure is the | ||||||||
| 18 | // responsibility of the back-end, which has more accurate information about | ||||||||
| 19 | // register pressure and also handles other optimizations than LICM that | ||||||||
| 20 | // increase live-ranges. | ||||||||
| 21 | // | ||||||||
| 22 | // This pass uses alias analysis for two purposes: | ||||||||
| 23 | // | ||||||||
| 24 | // 1. Moving loop invariant loads and calls out of loops. If we can determine | ||||||||
| 25 | // that a load or call inside of a loop never aliases anything stored to, | ||||||||
| 26 | // we can hoist it or sink it like any other instruction. | ||||||||
| 27 | // 2. Scalar Promotion of Memory - If there is a store instruction inside of | ||||||||
| 28 | // the loop, we try to move the store to happen AFTER the loop instead of | ||||||||
| 29 | // inside of the loop. This can only happen if a few conditions are true: | ||||||||
| 30 | // A. The pointer stored through is loop invariant | ||||||||
| 31 | // B. There are no stores or loads in the loop which _may_ alias the | ||||||||
| 32 | // pointer. There are no calls in the loop which mod/ref the pointer. | ||||||||
| 33 | // If these conditions are true, we can promote the loads and stores in the | ||||||||
| 34 | // loop of the pointer to use a temporary alloca'd variable. We then use | ||||||||
| 35 | // the SSAUpdater to construct the appropriate SSA form for the value. | ||||||||
| 36 | // | ||||||||
| 37 | //===----------------------------------------------------------------------===// | ||||||||
| 38 | |||||||||
| 39 | #include "llvm/Transforms/Scalar/LICM.h" | ||||||||
| 40 | #include "llvm/ADT/SetOperations.h" | ||||||||
| 41 | #include "llvm/ADT/Statistic.h" | ||||||||
| 42 | #include "llvm/Analysis/AliasAnalysis.h" | ||||||||
| 43 | #include "llvm/Analysis/AliasSetTracker.h" | ||||||||
| 44 | #include "llvm/Analysis/BasicAliasAnalysis.h" | ||||||||
| 45 | #include "llvm/Analysis/BlockFrequencyInfo.h" | ||||||||
| 46 | #include "llvm/Analysis/CaptureTracking.h" | ||||||||
| 47 | #include "llvm/Analysis/ConstantFolding.h" | ||||||||
| 48 | #include "llvm/Analysis/GlobalsModRef.h" | ||||||||
| 49 | #include "llvm/Analysis/GuardUtils.h" | ||||||||
| 50 | #include "llvm/Analysis/LazyBlockFrequencyInfo.h" | ||||||||
| 51 | #include "llvm/Analysis/Loads.h" | ||||||||
| 52 | #include "llvm/Analysis/LoopInfo.h" | ||||||||
| 53 | #include "llvm/Analysis/LoopIterator.h" | ||||||||
| 54 | #include "llvm/Analysis/LoopPass.h" | ||||||||
| 55 | #include "llvm/Analysis/MemoryBuiltins.h" | ||||||||
| 56 | #include "llvm/Analysis/MemorySSA.h" | ||||||||
| 57 | #include "llvm/Analysis/MemorySSAUpdater.h" | ||||||||
| 58 | #include "llvm/Analysis/MustExecute.h" | ||||||||
| 59 | #include "llvm/Analysis/OptimizationRemarkEmitter.h" | ||||||||
| 60 | #include "llvm/Analysis/ScalarEvolution.h" | ||||||||
| 61 | #include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h" | ||||||||
| 62 | #include "llvm/Analysis/TargetLibraryInfo.h" | ||||||||
| 63 | #include "llvm/Analysis/ValueTracking.h" | ||||||||
| 64 | #include "llvm/IR/CFG.h" | ||||||||
| 65 | #include "llvm/IR/Constants.h" | ||||||||
| 66 | #include "llvm/IR/DataLayout.h" | ||||||||
| 67 | #include "llvm/IR/DebugInfoMetadata.h" | ||||||||
| 68 | #include "llvm/IR/DerivedTypes.h" | ||||||||
| 69 | #include "llvm/IR/Dominators.h" | ||||||||
| 70 | #include "llvm/IR/Instructions.h" | ||||||||
| 71 | #include "llvm/IR/IntrinsicInst.h" | ||||||||
| 72 | #include "llvm/IR/LLVMContext.h" | ||||||||
| 73 | #include "llvm/IR/Metadata.h" | ||||||||
| 74 | #include "llvm/IR/PatternMatch.h" | ||||||||
| 75 | #include "llvm/IR/PredIteratorCache.h" | ||||||||
| 76 | #include "llvm/InitializePasses.h" | ||||||||
| 77 | #include "llvm/Support/CommandLine.h" | ||||||||
| 78 | #include "llvm/Support/Debug.h" | ||||||||
| 79 | #include "llvm/Support/raw_ostream.h" | ||||||||
| 80 | #include "llvm/Transforms/Scalar.h" | ||||||||
| 81 | #include "llvm/Transforms/Scalar/LoopPassManager.h" | ||||||||
| 82 | #include "llvm/Transforms/Utils/AssumeBundleBuilder.h" | ||||||||
| 83 | #include "llvm/Transforms/Utils/BasicBlockUtils.h" | ||||||||
| 84 | #include "llvm/Transforms/Utils/Local.h" | ||||||||
| 85 | #include "llvm/Transforms/Utils/LoopUtils.h" | ||||||||
| 86 | #include "llvm/Transforms/Utils/SSAUpdater.h" | ||||||||
| 87 | #include <algorithm> | ||||||||
| 88 | #include <utility> | ||||||||
| 89 | using namespace llvm; | ||||||||
| 90 | |||||||||
| 91 | #define DEBUG_TYPE"licm" "licm" | ||||||||
| 92 | |||||||||
| 93 | STATISTIC(NumCreatedBlocks, "Number of blocks created")static llvm::Statistic NumCreatedBlocks = {"licm", "NumCreatedBlocks" , "Number of blocks created"}; | ||||||||
| 94 | STATISTIC(NumClonedBranches, "Number of branches cloned")static llvm::Statistic NumClonedBranches = {"licm", "NumClonedBranches" , "Number of branches cloned"}; | ||||||||
| 95 | STATISTIC(NumSunk, "Number of instructions sunk out of loop")static llvm::Statistic NumSunk = {"licm", "NumSunk", "Number of instructions sunk out of loop" }; | ||||||||
| 96 | STATISTIC(NumHoisted, "Number of instructions hoisted out of loop")static llvm::Statistic NumHoisted = {"licm", "NumHoisted", "Number of instructions hoisted out of loop" }; | ||||||||
| 97 | STATISTIC(NumMovedLoads, "Number of load insts hoisted or sunk")static llvm::Statistic NumMovedLoads = {"licm", "NumMovedLoads" , "Number of load insts hoisted or sunk"}; | ||||||||
| 98 | STATISTIC(NumMovedCalls, "Number of call insts hoisted or sunk")static llvm::Statistic NumMovedCalls = {"licm", "NumMovedCalls" , "Number of call insts hoisted or sunk"}; | ||||||||
| 99 | STATISTIC(NumPromoted, "Number of memory locations promoted to registers")static llvm::Statistic NumPromoted = {"licm", "NumPromoted", "Number of memory locations promoted to registers" }; | ||||||||
| 100 | |||||||||
| 101 | /// Memory promotion is enabled by default. | ||||||||
| 102 | static cl::opt<bool> | ||||||||
| 103 | DisablePromotion("disable-licm-promotion", cl::Hidden, cl::init(false), | ||||||||
| 104 | cl::desc("Disable memory promotion in LICM pass")); | ||||||||
| 105 | |||||||||
| 106 | static cl::opt<bool> ControlFlowHoisting( | ||||||||
| 107 | "licm-control-flow-hoisting", cl::Hidden, cl::init(false), | ||||||||
| 108 | cl::desc("Enable control flow (and PHI) hoisting in LICM")); | ||||||||
| 109 | |||||||||
| 110 | static cl::opt<unsigned> HoistSinkColdnessThreshold( | ||||||||
| 111 | "licm-coldness-threshold", cl::Hidden, cl::init(4), | ||||||||
| 112 | cl::desc("Relative coldness Threshold of hoisting/sinking destination " | ||||||||
| 113 | "block for LICM to be considered beneficial")); | ||||||||
| 114 | |||||||||
| 115 | static cl::opt<uint32_t> MaxNumUsesTraversed( | ||||||||
| 116 | "licm-max-num-uses-traversed", cl::Hidden, cl::init(8), | ||||||||
| 117 | cl::desc("Max num uses visited for identifying load " | ||||||||
| 118 | "invariance in loop using invariant start (default = 8)")); | ||||||||
| 119 | |||||||||
| 120 | // Default value of zero implies we use the regular alias set tracker mechanism | ||||||||
| 121 | // instead of the cross product using AA to identify aliasing of the memory | ||||||||
| 122 | // location we are interested in. | ||||||||
| 123 | static cl::opt<int> | ||||||||
| 124 | LICMN2Theshold("licm-n2-threshold", cl::Hidden, cl::init(0), | ||||||||
| 125 | cl::desc("How many instruction to cross product using AA")); | ||||||||
| 126 | |||||||||
| 127 | // Experimental option to allow imprecision in LICM in pathological cases, in | ||||||||
| 128 | // exchange for faster compile. This is to be removed if MemorySSA starts to | ||||||||
| 129 | // address the same issue. This flag applies only when LICM uses MemorySSA | ||||||||
| 130 | // instead on AliasSetTracker. LICM calls MemorySSAWalker's | ||||||||
| 131 | // getClobberingMemoryAccess, up to the value of the Cap, getting perfect | ||||||||
| 132 | // accuracy. Afterwards, LICM will call into MemorySSA's getDefiningAccess, | ||||||||
| 133 | // which may not be precise, since optimizeUses is capped. The result is | ||||||||
| 134 | // correct, but we may not get as "far up" as possible to get which access is | ||||||||
| 135 | // clobbering the one queried. | ||||||||
| 136 | cl::opt<unsigned> llvm::SetLicmMssaOptCap( | ||||||||
| 137 | "licm-mssa-optimization-cap", cl::init(100), cl::Hidden, | ||||||||
| 138 | cl::desc("Enable imprecision in LICM in pathological cases, in exchange " | ||||||||
| 139 | "for faster compile. Caps the MemorySSA clobbering calls.")); | ||||||||
| 140 | |||||||||
| 141 | // Experimentally, memory promotion carries less importance than sinking and | ||||||||
| 142 | // hoisting. Limit when we do promotion when using MemorySSA, in order to save | ||||||||
| 143 | // compile time. | ||||||||
| 144 | cl::opt<unsigned> llvm::SetLicmMssaNoAccForPromotionCap( | ||||||||
| 145 | "licm-mssa-max-acc-promotion", cl::init(250), cl::Hidden, | ||||||||
| 146 | cl::desc("[LICM & MemorySSA] When MSSA in LICM is disabled, this has no " | ||||||||
| 147 | "effect. When MSSA in LICM is enabled, then this is the maximum " | ||||||||
| 148 | "number of accesses allowed to be present in a loop in order to " | ||||||||
| 149 | "enable memory promotion.")); | ||||||||
| 150 | |||||||||
| 151 | static bool inSubLoop(BasicBlock *BB, Loop *CurLoop, LoopInfo *LI); | ||||||||
| 152 | static bool isNotUsedOrFreeInLoop(const Instruction &I, const Loop *CurLoop, | ||||||||
| 153 | const LoopSafetyInfo *SafetyInfo, | ||||||||
| 154 | TargetTransformInfo *TTI, bool &FreeInLoop); | ||||||||
| 155 | static void hoist(Instruction &I, const DominatorTree *DT, const Loop *CurLoop, | ||||||||
| 156 | BasicBlock *Dest, ICFLoopSafetyInfo *SafetyInfo, | ||||||||
| 157 | MemorySSAUpdater *MSSAU, ScalarEvolution *SE, | ||||||||
| 158 | OptimizationRemarkEmitter *ORE); | ||||||||
| 159 | static bool sink(Instruction &I, LoopInfo *LI, DominatorTree *DT, | ||||||||
| 160 | BlockFrequencyInfo *BFI, const Loop *CurLoop, | ||||||||
| 161 | ICFLoopSafetyInfo *SafetyInfo, MemorySSAUpdater *MSSAU, | ||||||||
| 162 | OptimizationRemarkEmitter *ORE); | ||||||||
| 163 | static bool isSafeToExecuteUnconditionally(Instruction &Inst, | ||||||||
| 164 | const DominatorTree *DT, | ||||||||
| 165 | const TargetLibraryInfo *TLI, | ||||||||
| 166 | const Loop *CurLoop, | ||||||||
| 167 | const LoopSafetyInfo *SafetyInfo, | ||||||||
| 168 | OptimizationRemarkEmitter *ORE, | ||||||||
| 169 | const Instruction *CtxI = nullptr); | ||||||||
| 170 | static bool pointerInvalidatedByLoop(MemoryLocation MemLoc, | ||||||||
| 171 | AliasSetTracker *CurAST, Loop *CurLoop, | ||||||||
| 172 | AAResults *AA); | ||||||||
| 173 | static bool pointerInvalidatedByLoopWithMSSA(MemorySSA *MSSA, MemoryUse *MU, | ||||||||
| 174 | Loop *CurLoop, Instruction &I, | ||||||||
| 175 | SinkAndHoistLICMFlags &Flags); | ||||||||
| 176 | static bool pointerInvalidatedByBlockWithMSSA(BasicBlock &BB, MemorySSA &MSSA, | ||||||||
| 177 | MemoryUse &MU); | ||||||||
| 178 | static Instruction *cloneInstructionInExitBlock( | ||||||||
| 179 | Instruction &I, BasicBlock &ExitBlock, PHINode &PN, const LoopInfo *LI, | ||||||||
| 180 | const LoopSafetyInfo *SafetyInfo, MemorySSAUpdater *MSSAU); | ||||||||
| 181 | |||||||||
| 182 | static void eraseInstruction(Instruction &I, ICFLoopSafetyInfo &SafetyInfo, | ||||||||
| 183 | AliasSetTracker *AST, MemorySSAUpdater *MSSAU); | ||||||||
| 184 | |||||||||
| 185 | static void moveInstructionBefore(Instruction &I, Instruction &Dest, | ||||||||
| 186 | ICFLoopSafetyInfo &SafetyInfo, | ||||||||
| 187 | MemorySSAUpdater *MSSAU, ScalarEvolution *SE); | ||||||||
| 188 | |||||||||
| 189 | static void foreachMemoryAccess(MemorySSA *MSSA, Loop *L, | ||||||||
| 190 | function_ref<void(Instruction *)> Fn); | ||||||||
| 191 | static SmallVector<SmallSetVector<Value *, 8>, 0> | ||||||||
| 192 | collectPromotionCandidates(MemorySSA *MSSA, AliasAnalysis *AA, Loop *L, | ||||||||
| 193 | SmallVectorImpl<Instruction *> &MaybePromotable); | ||||||||
| 194 | |||||||||
| 195 | namespace { | ||||||||
| 196 | struct LoopInvariantCodeMotion { | ||||||||
| 197 | bool runOnLoop(Loop *L, AAResults *AA, LoopInfo *LI, DominatorTree *DT, | ||||||||
| 198 | BlockFrequencyInfo *BFI, TargetLibraryInfo *TLI, | ||||||||
| 199 | TargetTransformInfo *TTI, ScalarEvolution *SE, MemorySSA *MSSA, | ||||||||
| 200 | OptimizationRemarkEmitter *ORE); | ||||||||
| 201 | |||||||||
| 202 | LoopInvariantCodeMotion(unsigned LicmMssaOptCap, | ||||||||
| 203 | unsigned LicmMssaNoAccForPromotionCap) | ||||||||
| 204 | : LicmMssaOptCap(LicmMssaOptCap), | ||||||||
| 205 | LicmMssaNoAccForPromotionCap(LicmMssaNoAccForPromotionCap) {} | ||||||||
| 206 | |||||||||
| 207 | private: | ||||||||
| 208 | unsigned LicmMssaOptCap; | ||||||||
| 209 | unsigned LicmMssaNoAccForPromotionCap; | ||||||||
| 210 | |||||||||
| 211 | std::unique_ptr<AliasSetTracker> | ||||||||
| 212 | collectAliasInfoForLoop(Loop *L, LoopInfo *LI, AAResults *AA); | ||||||||
| 213 | }; | ||||||||
| 214 | |||||||||
| 215 | struct LegacyLICMPass : public LoopPass { | ||||||||
| 216 | static char ID; // Pass identification, replacement for typeid | ||||||||
| 217 | LegacyLICMPass( | ||||||||
| 218 | unsigned LicmMssaOptCap = SetLicmMssaOptCap, | ||||||||
| 219 | unsigned LicmMssaNoAccForPromotionCap = SetLicmMssaNoAccForPromotionCap) | ||||||||
| 220 | : LoopPass(ID), LICM(LicmMssaOptCap, LicmMssaNoAccForPromotionCap) { | ||||||||
| 221 | initializeLegacyLICMPassPass(*PassRegistry::getPassRegistry()); | ||||||||
| 222 | } | ||||||||
| 223 | |||||||||
| 224 | bool runOnLoop(Loop *L, LPPassManager &LPM) override { | ||||||||
| 225 | if (skipLoop(L)) | ||||||||
| 226 | return false; | ||||||||
| 227 | |||||||||
| 228 | LLVM_DEBUG(dbgs() << "Perform LICM on Loop with header at block "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "Perform LICM on Loop with header at block " << L->getHeader()->getNameOrAsOperand() << "\n"; } } while (false) | ||||||||
| 229 | << L->getHeader()->getNameOrAsOperand() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "Perform LICM on Loop with header at block " << L->getHeader()->getNameOrAsOperand() << "\n"; } } while (false); | ||||||||
| 230 | |||||||||
| 231 | auto *SE = getAnalysisIfAvailable<ScalarEvolutionWrapperPass>(); | ||||||||
| 232 | MemorySSA *MSSA = EnableMSSALoopDependency | ||||||||
| 233 | ? (&getAnalysis<MemorySSAWrapperPass>().getMSSA()) | ||||||||
| 234 | : nullptr; | ||||||||
| 235 | bool hasProfileData = L->getHeader()->getParent()->hasProfileData(); | ||||||||
| 236 | BlockFrequencyInfo *BFI = | ||||||||
| 237 | hasProfileData ? &getAnalysis<LazyBlockFrequencyInfoPass>().getBFI() | ||||||||
| 238 | : nullptr; | ||||||||
| 239 | // For the old PM, we can't use OptimizationRemarkEmitter as an analysis | ||||||||
| 240 | // pass. Function analyses need to be preserved across loop transformations | ||||||||
| 241 | // but ORE cannot be preserved (see comment before the pass definition). | ||||||||
| 242 | OptimizationRemarkEmitter ORE(L->getHeader()->getParent()); | ||||||||
| 243 | return LICM.runOnLoop( | ||||||||
| 244 | L, &getAnalysis<AAResultsWrapperPass>().getAAResults(), | ||||||||
| 245 | &getAnalysis<LoopInfoWrapperPass>().getLoopInfo(), | ||||||||
| 246 | &getAnalysis<DominatorTreeWrapperPass>().getDomTree(), BFI, | ||||||||
| 247 | &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI( | ||||||||
| 248 | *L->getHeader()->getParent()), | ||||||||
| 249 | &getAnalysis<TargetTransformInfoWrapperPass>().getTTI( | ||||||||
| 250 | *L->getHeader()->getParent()), | ||||||||
| 251 | SE ? &SE->getSE() : nullptr, MSSA, &ORE); | ||||||||
| 252 | } | ||||||||
| 253 | |||||||||
| 254 | /// This transformation requires natural loop information & requires that | ||||||||
| 255 | /// loop preheaders be inserted into the CFG... | ||||||||
| 256 | /// | ||||||||
| 257 | void getAnalysisUsage(AnalysisUsage &AU) const override { | ||||||||
| 258 | AU.addPreserved<DominatorTreeWrapperPass>(); | ||||||||
| 259 | AU.addPreserved<LoopInfoWrapperPass>(); | ||||||||
| 260 | AU.addRequired<TargetLibraryInfoWrapperPass>(); | ||||||||
| 261 | if (EnableMSSALoopDependency) { | ||||||||
| 262 | AU.addRequired<MemorySSAWrapperPass>(); | ||||||||
| 263 | AU.addPreserved<MemorySSAWrapperPass>(); | ||||||||
| 264 | } | ||||||||
| 265 | AU.addRequired<TargetTransformInfoWrapperPass>(); | ||||||||
| 266 | getLoopAnalysisUsage(AU); | ||||||||
| 267 | LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AU); | ||||||||
| 268 | AU.addPreserved<LazyBlockFrequencyInfoPass>(); | ||||||||
| 269 | AU.addPreserved<LazyBranchProbabilityInfoPass>(); | ||||||||
| 270 | } | ||||||||
| 271 | |||||||||
| 272 | private: | ||||||||
| 273 | LoopInvariantCodeMotion LICM; | ||||||||
| 274 | }; | ||||||||
| 275 | } // namespace | ||||||||
| 276 | |||||||||
| 277 | PreservedAnalyses LICMPass::run(Loop &L, LoopAnalysisManager &AM, | ||||||||
| 278 | LoopStandardAnalysisResults &AR, LPMUpdater &) { | ||||||||
| 279 | // For the new PM, we also can't use OptimizationRemarkEmitter as an analysis | ||||||||
| 280 | // pass. Function analyses need to be preserved across loop transformations | ||||||||
| 281 | // but ORE cannot be preserved (see comment before the pass definition). | ||||||||
| 282 | OptimizationRemarkEmitter ORE(L.getHeader()->getParent()); | ||||||||
| 283 | |||||||||
| 284 | LoopInvariantCodeMotion LICM(LicmMssaOptCap, LicmMssaNoAccForPromotionCap); | ||||||||
| 285 | if (!LICM.runOnLoop(&L, &AR.AA, &AR.LI, &AR.DT, AR.BFI, &AR.TLI, &AR.TTI, | ||||||||
| 286 | &AR.SE, AR.MSSA, &ORE)) | ||||||||
| 287 | return PreservedAnalyses::all(); | ||||||||
| 288 | |||||||||
| 289 | auto PA = getLoopPassPreservedAnalyses(); | ||||||||
| 290 | |||||||||
| 291 | PA.preserve<DominatorTreeAnalysis>(); | ||||||||
| 292 | PA.preserve<LoopAnalysis>(); | ||||||||
| 293 | if (AR.MSSA) | ||||||||
| 294 | PA.preserve<MemorySSAAnalysis>(); | ||||||||
| 295 | |||||||||
| 296 | return PA; | ||||||||
| 297 | } | ||||||||
| 298 | |||||||||
| 299 | char LegacyLICMPass::ID = 0; | ||||||||
| 300 | INITIALIZE_PASS_BEGIN(LegacyLICMPass, "licm", "Loop Invariant Code Motion",static void *initializeLegacyLICMPassPassOnce(PassRegistry & Registry) { | ||||||||
| 301 | false, false)static void *initializeLegacyLICMPassPassOnce(PassRegistry & Registry) { | ||||||||
| 302 | INITIALIZE_PASS_DEPENDENCY(LoopPass)initializeLoopPassPass(Registry); | ||||||||
| 303 | INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)initializeTargetLibraryInfoWrapperPassPass(Registry); | ||||||||
| 304 | INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)initializeTargetTransformInfoWrapperPassPass(Registry); | ||||||||
| 305 | INITIALIZE_PASS_DEPENDENCY(MemorySSAWrapperPass)initializeMemorySSAWrapperPassPass(Registry); | ||||||||
| 306 | INITIALIZE_PASS_DEPENDENCY(LazyBFIPass)initializeLazyBFIPassPass(Registry); | ||||||||
| 307 | INITIALIZE_PASS_END(LegacyLICMPass, "licm", "Loop Invariant Code Motion", false,PassInfo *PI = new PassInfo( "Loop Invariant Code Motion", "licm" , &LegacyLICMPass::ID, PassInfo::NormalCtor_t(callDefaultCtor <LegacyLICMPass>), false, false); Registry.registerPass (*PI, true); return PI; } static llvm::once_flag InitializeLegacyLICMPassPassFlag ; void llvm::initializeLegacyLICMPassPass(PassRegistry &Registry ) { llvm::call_once(InitializeLegacyLICMPassPassFlag, initializeLegacyLICMPassPassOnce , std::ref(Registry)); } | ||||||||
| 308 | false)PassInfo *PI = new PassInfo( "Loop Invariant Code Motion", "licm" , &LegacyLICMPass::ID, PassInfo::NormalCtor_t(callDefaultCtor <LegacyLICMPass>), false, false); Registry.registerPass (*PI, true); return PI; } static llvm::once_flag InitializeLegacyLICMPassPassFlag ; void llvm::initializeLegacyLICMPassPass(PassRegistry &Registry ) { llvm::call_once(InitializeLegacyLICMPassPassFlag, initializeLegacyLICMPassPassOnce , std::ref(Registry)); } | ||||||||
| 309 | |||||||||
| 310 | Pass *llvm::createLICMPass() { return new LegacyLICMPass(); } | ||||||||
| 311 | Pass *llvm::createLICMPass(unsigned LicmMssaOptCap, | ||||||||
| 312 | unsigned LicmMssaNoAccForPromotionCap) { | ||||||||
| 313 | return new LegacyLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap); | ||||||||
| 314 | } | ||||||||
| 315 | |||||||||
| 316 | llvm::SinkAndHoistLICMFlags::SinkAndHoistLICMFlags(bool IsSink, Loop *L, | ||||||||
| 317 | MemorySSA *MSSA) | ||||||||
| 318 | : SinkAndHoistLICMFlags(SetLicmMssaOptCap, SetLicmMssaNoAccForPromotionCap, | ||||||||
| 319 | IsSink, L, MSSA) {} | ||||||||
| 320 | |||||||||
| 321 | llvm::SinkAndHoistLICMFlags::SinkAndHoistLICMFlags( | ||||||||
| 322 | unsigned LicmMssaOptCap, unsigned LicmMssaNoAccForPromotionCap, bool IsSink, | ||||||||
| 323 | Loop *L, MemorySSA *MSSA) | ||||||||
| 324 | : LicmMssaOptCap(LicmMssaOptCap), | ||||||||
| 325 | LicmMssaNoAccForPromotionCap(LicmMssaNoAccForPromotionCap), | ||||||||
| 326 | IsSink(IsSink) { | ||||||||
| 327 | assert(((L != nullptr) == (MSSA != nullptr)) &&((((L != nullptr) == (MSSA != nullptr)) && "Unexpected values for SinkAndHoistLICMFlags" ) ? static_cast<void> (0) : __assert_fail ("((L != nullptr) == (MSSA != nullptr)) && \"Unexpected values for SinkAndHoistLICMFlags\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 328, __PRETTY_FUNCTION__)) | ||||||||
| 328 | "Unexpected values for SinkAndHoistLICMFlags")((((L != nullptr) == (MSSA != nullptr)) && "Unexpected values for SinkAndHoistLICMFlags" ) ? static_cast<void> (0) : __assert_fail ("((L != nullptr) == (MSSA != nullptr)) && \"Unexpected values for SinkAndHoistLICMFlags\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 328, __PRETTY_FUNCTION__)); | ||||||||
| 329 | if (!MSSA) | ||||||||
| 330 | return; | ||||||||
| 331 | |||||||||
| 332 | unsigned AccessCapCount = 0; | ||||||||
| 333 | for (auto *BB : L->getBlocks()) | ||||||||
| 334 | if (const auto *Accesses = MSSA->getBlockAccesses(BB)) | ||||||||
| 335 | for (const auto &MA : *Accesses) { | ||||||||
| 336 | (void)MA; | ||||||||
| 337 | ++AccessCapCount; | ||||||||
| 338 | if (AccessCapCount > LicmMssaNoAccForPromotionCap) { | ||||||||
| 339 | NoOfMemAccTooLarge = true; | ||||||||
| 340 | return; | ||||||||
| 341 | } | ||||||||
| 342 | } | ||||||||
| 343 | } | ||||||||
| 344 | |||||||||
| 345 | /// Hoist expressions out of the specified loop. Note, alias info for inner | ||||||||
| 346 | /// loop is not preserved so it is not a good idea to run LICM multiple | ||||||||
| 347 | /// times on one loop. | ||||||||
| 348 | bool LoopInvariantCodeMotion::runOnLoop( | ||||||||
| 349 | Loop *L, AAResults *AA, LoopInfo *LI, DominatorTree *DT, | ||||||||
| 350 | BlockFrequencyInfo *BFI, TargetLibraryInfo *TLI, TargetTransformInfo *TTI, | ||||||||
| 351 | ScalarEvolution *SE, MemorySSA *MSSA, OptimizationRemarkEmitter *ORE) { | ||||||||
| 352 | bool Changed = false; | ||||||||
| 353 | |||||||||
| 354 | assert(L->isLCSSAForm(*DT) && "Loop is not in LCSSA form.")((L->isLCSSAForm(*DT) && "Loop is not in LCSSA form." ) ? static_cast<void> (0) : __assert_fail ("L->isLCSSAForm(*DT) && \"Loop is not in LCSSA form.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 354, __PRETTY_FUNCTION__)); | ||||||||
| 355 | |||||||||
| 356 | // If this loop has metadata indicating that LICM is not to be performed then | ||||||||
| 357 | // just exit. | ||||||||
| 358 | if (hasDisableLICMTransformsHint(L)) { | ||||||||
| 359 | return false; | ||||||||
| 360 | } | ||||||||
| 361 | |||||||||
| 362 | std::unique_ptr<AliasSetTracker> CurAST; | ||||||||
| 363 | std::unique_ptr<MemorySSAUpdater> MSSAU; | ||||||||
| 364 | std::unique_ptr<SinkAndHoistLICMFlags> Flags; | ||||||||
| 365 | |||||||||
| 366 | // Don't sink stores from loops with coroutine suspend instructions. | ||||||||
| 367 | // LICM would sink instructions into the default destination of | ||||||||
| 368 | // the coroutine switch. The default destination of the switch is to | ||||||||
| 369 | // handle the case where the coroutine is suspended, by which point the | ||||||||
| 370 | // coroutine frame may have been destroyed. No instruction can be sunk there. | ||||||||
| 371 | // FIXME: This would unfortunately hurt the performance of coroutines, however | ||||||||
| 372 | // there is currently no general solution for this. Similar issues could also | ||||||||
| 373 | // potentially happen in other passes where instructions are being moved | ||||||||
| 374 | // across that edge. | ||||||||
| 375 | bool HasCoroSuspendInst = llvm::any_of(L->getBlocks(), [](BasicBlock *BB) { | ||||||||
| 376 | return llvm::any_of(*BB, [](Instruction &I) { | ||||||||
| 377 | IntrinsicInst *II = dyn_cast<IntrinsicInst>(&I); | ||||||||
| 378 | return II && II->getIntrinsicID() == Intrinsic::coro_suspend; | ||||||||
| 379 | }); | ||||||||
| 380 | }); | ||||||||
| 381 | |||||||||
| 382 | if (!MSSA) { | ||||||||
| 383 | LLVM_DEBUG(dbgs() << "LICM: Using Alias Set Tracker.\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM: Using Alias Set Tracker.\n" ; } } while (false); | ||||||||
| 384 | CurAST = collectAliasInfoForLoop(L, LI, AA); | ||||||||
| 385 | Flags = std::make_unique<SinkAndHoistLICMFlags>( | ||||||||
| 386 | LicmMssaOptCap, LicmMssaNoAccForPromotionCap, /*IsSink=*/true); | ||||||||
| 387 | } else { | ||||||||
| 388 | LLVM_DEBUG(dbgs() << "LICM: Using MemorySSA.\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM: Using MemorySSA.\n"; } } while (false); | ||||||||
| 389 | MSSAU = std::make_unique<MemorySSAUpdater>(MSSA); | ||||||||
| 390 | Flags = std::make_unique<SinkAndHoistLICMFlags>( | ||||||||
| 391 | LicmMssaOptCap, LicmMssaNoAccForPromotionCap, /*IsSink=*/true, L, MSSA); | ||||||||
| 392 | } | ||||||||
| 393 | |||||||||
| 394 | // Get the preheader block to move instructions into... | ||||||||
| 395 | BasicBlock *Preheader = L->getLoopPreheader(); | ||||||||
| 396 | |||||||||
| 397 | // Compute loop safety information. | ||||||||
| 398 | ICFLoopSafetyInfo SafetyInfo; | ||||||||
| 399 | SafetyInfo.computeLoopSafetyInfo(L); | ||||||||
| 400 | |||||||||
| 401 | // We want to visit all of the instructions in this loop... that are not parts | ||||||||
| 402 | // of our subloops (they have already had their invariants hoisted out of | ||||||||
| 403 | // their loop, into this loop, so there is no need to process the BODIES of | ||||||||
| 404 | // the subloops). | ||||||||
| 405 | // | ||||||||
| 406 | // Traverse the body of the loop in depth first order on the dominator tree so | ||||||||
| 407 | // that we are guaranteed to see definitions before we see uses. This allows | ||||||||
| 408 | // us to sink instructions in one pass, without iteration. After sinking | ||||||||
| 409 | // instructions, we perform another pass to hoist them out of the loop. | ||||||||
| 410 | if (L->hasDedicatedExits()) | ||||||||
| 411 | Changed |= | ||||||||
| 412 | sinkRegion(DT->getNode(L->getHeader()), AA, LI, DT, BFI, TLI, TTI, L, | ||||||||
| 413 | CurAST.get(), MSSAU.get(), &SafetyInfo, *Flags.get(), ORE); | ||||||||
| 414 | Flags->setIsSink(false); | ||||||||
| 415 | if (Preheader) | ||||||||
| 416 | Changed |= hoistRegion(DT->getNode(L->getHeader()), AA, LI, DT, BFI, TLI, L, | ||||||||
| 417 | CurAST.get(), MSSAU.get(), SE, &SafetyInfo, | ||||||||
| 418 | *Flags.get(), ORE); | ||||||||
| 419 | |||||||||
| 420 | // Now that all loop invariants have been removed from the loop, promote any | ||||||||
| 421 | // memory references to scalars that we can. | ||||||||
| 422 | // Don't sink stores from loops without dedicated block exits. Exits | ||||||||
| 423 | // containing indirect branches are not transformed by loop simplify, | ||||||||
| 424 | // make sure we catch that. An additional load may be generated in the | ||||||||
| 425 | // preheader for SSA updater, so also avoid sinking when no preheader | ||||||||
| 426 | // is available. | ||||||||
| 427 | if (!DisablePromotion && Preheader && L->hasDedicatedExits() && | ||||||||
| 428 | !Flags->tooManyMemoryAccesses() && !HasCoroSuspendInst) { | ||||||||
| 429 | // Figure out the loop exits and their insertion points | ||||||||
| 430 | SmallVector<BasicBlock *, 8> ExitBlocks; | ||||||||
| 431 | L->getUniqueExitBlocks(ExitBlocks); | ||||||||
| 432 | |||||||||
| 433 | // We can't insert into a catchswitch. | ||||||||
| 434 | bool HasCatchSwitch = llvm::any_of(ExitBlocks, [](BasicBlock *Exit) { | ||||||||
| 435 | return isa<CatchSwitchInst>(Exit->getTerminator()); | ||||||||
| 436 | }); | ||||||||
| 437 | |||||||||
| 438 | if (!HasCatchSwitch) { | ||||||||
| 439 | SmallVector<Instruction *, 8> InsertPts; | ||||||||
| 440 | SmallVector<MemoryAccess *, 8> MSSAInsertPts; | ||||||||
| 441 | InsertPts.reserve(ExitBlocks.size()); | ||||||||
| 442 | if (MSSAU) | ||||||||
| 443 | MSSAInsertPts.reserve(ExitBlocks.size()); | ||||||||
| 444 | for (BasicBlock *ExitBlock : ExitBlocks) { | ||||||||
| 445 | InsertPts.push_back(&*ExitBlock->getFirstInsertionPt()); | ||||||||
| 446 | if (MSSAU) | ||||||||
| 447 | MSSAInsertPts.push_back(nullptr); | ||||||||
| 448 | } | ||||||||
| 449 | |||||||||
| 450 | PredIteratorCache PIC; | ||||||||
| 451 | |||||||||
| 452 | bool Promoted = false; | ||||||||
| 453 | if (CurAST.get()) { | ||||||||
| 454 | // Loop over all of the alias sets in the tracker object. | ||||||||
| 455 | for (AliasSet &AS : *CurAST) { | ||||||||
| 456 | // We can promote this alias set if it has a store, if it is a "Must" | ||||||||
| 457 | // alias set, if the pointer is loop invariant, and if we are not | ||||||||
| 458 | // eliminating any volatile loads or stores. | ||||||||
| 459 | if (AS.isForwardingAliasSet() || !AS.isMod() || !AS.isMustAlias() || | ||||||||
| 460 | !L->isLoopInvariant(AS.begin()->getValue())) | ||||||||
| 461 | continue; | ||||||||
| 462 | |||||||||
| 463 | assert(((!AS.empty() && "Must alias set should have at least one pointer element in it!" ) ? static_cast<void> (0) : __assert_fail ("!AS.empty() && \"Must alias set should have at least one pointer element in it!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 465, __PRETTY_FUNCTION__)) | ||||||||
| 464 | !AS.empty() &&((!AS.empty() && "Must alias set should have at least one pointer element in it!" ) ? static_cast<void> (0) : __assert_fail ("!AS.empty() && \"Must alias set should have at least one pointer element in it!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 465, __PRETTY_FUNCTION__)) | ||||||||
| 465 | "Must alias set should have at least one pointer element in it!")((!AS.empty() && "Must alias set should have at least one pointer element in it!" ) ? static_cast<void> (0) : __assert_fail ("!AS.empty() && \"Must alias set should have at least one pointer element in it!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 465, __PRETTY_FUNCTION__)); | ||||||||
| 466 | |||||||||
| 467 | SmallSetVector<Value *, 8> PointerMustAliases; | ||||||||
| 468 | for (const auto &ASI : AS) | ||||||||
| 469 | PointerMustAliases.insert(ASI.getValue()); | ||||||||
| 470 | |||||||||
| 471 | Promoted |= promoteLoopAccessesToScalars( | ||||||||
| 472 | PointerMustAliases, ExitBlocks, InsertPts, MSSAInsertPts, PIC, LI, | ||||||||
| 473 | DT, TLI, L, CurAST.get(), MSSAU.get(), &SafetyInfo, ORE); | ||||||||
| 474 | } | ||||||||
| 475 | } else { | ||||||||
| 476 | SmallVector<Instruction *, 16> MaybePromotable; | ||||||||
| 477 | foreachMemoryAccess(MSSA, L, [&](Instruction *I) { | ||||||||
| 478 | MaybePromotable.push_back(I); | ||||||||
| 479 | }); | ||||||||
| 480 | |||||||||
| 481 | // Promoting one set of accesses may make the pointers for another set | ||||||||
| 482 | // loop invariant, so run this in a loop (with the MaybePromotable set | ||||||||
| 483 | // decreasing in size over time). | ||||||||
| 484 | bool LocalPromoted; | ||||||||
| 485 | do { | ||||||||
| 486 | LocalPromoted = false; | ||||||||
| 487 | for (const SmallSetVector<Value *, 8> &PointerMustAliases : | ||||||||
| 488 | collectPromotionCandidates(MSSA, AA, L, MaybePromotable)) { | ||||||||
| 489 | LocalPromoted |= promoteLoopAccessesToScalars( | ||||||||
| 490 | PointerMustAliases, ExitBlocks, InsertPts, MSSAInsertPts, PIC, | ||||||||
| 491 | LI, DT, TLI, L, /*AST*/nullptr, MSSAU.get(), &SafetyInfo, ORE); | ||||||||
| 492 | } | ||||||||
| 493 | Promoted |= LocalPromoted; | ||||||||
| 494 | } while (LocalPromoted); | ||||||||
| 495 | } | ||||||||
| 496 | |||||||||
| 497 | // Once we have promoted values across the loop body we have to | ||||||||
| 498 | // recursively reform LCSSA as any nested loop may now have values defined | ||||||||
| 499 | // within the loop used in the outer loop. | ||||||||
| 500 | // FIXME: This is really heavy handed. It would be a bit better to use an | ||||||||
| 501 | // SSAUpdater strategy during promotion that was LCSSA aware and reformed | ||||||||
| 502 | // it as it went. | ||||||||
| 503 | if (Promoted) | ||||||||
| 504 | formLCSSARecursively(*L, *DT, LI, SE); | ||||||||
| 505 | |||||||||
| 506 | Changed |= Promoted; | ||||||||
| 507 | } | ||||||||
| 508 | } | ||||||||
| 509 | |||||||||
| 510 | // Check that neither this loop nor its parent have had LCSSA broken. LICM is | ||||||||
| 511 | // specifically moving instructions across the loop boundary and so it is | ||||||||
| 512 | // especially in need of sanity checking here. | ||||||||
| 513 | assert(L->isLCSSAForm(*DT) && "Loop not left in LCSSA form after LICM!")((L->isLCSSAForm(*DT) && "Loop not left in LCSSA form after LICM!" ) ? static_cast<void> (0) : __assert_fail ("L->isLCSSAForm(*DT) && \"Loop not left in LCSSA form after LICM!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 513, __PRETTY_FUNCTION__)); | ||||||||
| 514 | assert((L->isOutermost() || L->getParentLoop()->isLCSSAForm(*DT)) &&(((L->isOutermost() || L->getParentLoop()->isLCSSAForm (*DT)) && "Parent loop not left in LCSSA form after LICM!" ) ? static_cast<void> (0) : __assert_fail ("(L->isOutermost() || L->getParentLoop()->isLCSSAForm(*DT)) && \"Parent loop not left in LCSSA form after LICM!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 515, __PRETTY_FUNCTION__)) | ||||||||
| 515 | "Parent loop not left in LCSSA form after LICM!")(((L->isOutermost() || L->getParentLoop()->isLCSSAForm (*DT)) && "Parent loop not left in LCSSA form after LICM!" ) ? static_cast<void> (0) : __assert_fail ("(L->isOutermost() || L->getParentLoop()->isLCSSAForm(*DT)) && \"Parent loop not left in LCSSA form after LICM!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 515, __PRETTY_FUNCTION__)); | ||||||||
| 516 | |||||||||
| 517 | if (MSSAU.get() && VerifyMemorySSA) | ||||||||
| 518 | MSSAU->getMemorySSA()->verifyMemorySSA(); | ||||||||
| 519 | |||||||||
| 520 | if (Changed && SE) | ||||||||
| 521 | SE->forgetLoopDispositions(L); | ||||||||
| 522 | return Changed; | ||||||||
| 523 | } | ||||||||
| 524 | |||||||||
| 525 | /// Walk the specified region of the CFG (defined by all blocks dominated by | ||||||||
| 526 | /// the specified block, and that are in the current loop) in reverse depth | ||||||||
| 527 | /// first order w.r.t the DominatorTree. This allows us to visit uses before | ||||||||
| 528 | /// definitions, allowing us to sink a loop body in one pass without iteration. | ||||||||
| 529 | /// | ||||||||
| 530 | bool llvm::sinkRegion(DomTreeNode *N, AAResults *AA, LoopInfo *LI, | ||||||||
| 531 | DominatorTree *DT, BlockFrequencyInfo *BFI, | ||||||||
| 532 | TargetLibraryInfo *TLI, TargetTransformInfo *TTI, | ||||||||
| 533 | Loop *CurLoop, AliasSetTracker *CurAST, | ||||||||
| 534 | MemorySSAUpdater *MSSAU, ICFLoopSafetyInfo *SafetyInfo, | ||||||||
| 535 | SinkAndHoistLICMFlags &Flags, | ||||||||
| 536 | OptimizationRemarkEmitter *ORE) { | ||||||||
| 537 | |||||||||
| 538 | // Verify inputs. | ||||||||
| 539 | assert(N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr &&((N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected input to sinkRegion." ) ? static_cast<void> (0) : __assert_fail ("N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected input to sinkRegion.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 541, __PRETTY_FUNCTION__)) | ||||||||
| 540 | CurLoop != nullptr && SafetyInfo != nullptr &&((N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected input to sinkRegion." ) ? static_cast<void> (0) : __assert_fail ("N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected input to sinkRegion.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 541, __PRETTY_FUNCTION__)) | ||||||||
| 541 | "Unexpected input to sinkRegion.")((N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected input to sinkRegion." ) ? static_cast<void> (0) : __assert_fail ("N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected input to sinkRegion.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 541, __PRETTY_FUNCTION__)); | ||||||||
| 542 | assert(((CurAST != nullptr) ^ (MSSAU != nullptr)) &&((((CurAST != nullptr) ^ (MSSAU != nullptr)) && "Either AliasSetTracker or MemorySSA should be initialized." ) ? static_cast<void> (0) : __assert_fail ("((CurAST != nullptr) ^ (MSSAU != nullptr)) && \"Either AliasSetTracker or MemorySSA should be initialized.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 543, __PRETTY_FUNCTION__)) | ||||||||
| 543 | "Either AliasSetTracker or MemorySSA should be initialized.")((((CurAST != nullptr) ^ (MSSAU != nullptr)) && "Either AliasSetTracker or MemorySSA should be initialized." ) ? static_cast<void> (0) : __assert_fail ("((CurAST != nullptr) ^ (MSSAU != nullptr)) && \"Either AliasSetTracker or MemorySSA should be initialized.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 543, __PRETTY_FUNCTION__)); | ||||||||
| 544 | |||||||||
| 545 | // We want to visit children before parents. We will enque all the parents | ||||||||
| 546 | // before their children in the worklist and process the worklist in reverse | ||||||||
| 547 | // order. | ||||||||
| 548 | SmallVector<DomTreeNode *, 16> Worklist = collectChildrenInLoop(N, CurLoop); | ||||||||
| 549 | |||||||||
| 550 | bool Changed = false; | ||||||||
| 551 | for (DomTreeNode *DTN : reverse(Worklist)) { | ||||||||
| 552 | BasicBlock *BB = DTN->getBlock(); | ||||||||
| 553 | // Only need to process the contents of this block if it is not part of a | ||||||||
| 554 | // subloop (which would already have been processed). | ||||||||
| 555 | if (inSubLoop(BB, CurLoop, LI)) | ||||||||
| 556 | continue; | ||||||||
| 557 | |||||||||
| 558 | for (BasicBlock::iterator II = BB->end(); II != BB->begin();) { | ||||||||
| 559 | Instruction &I = *--II; | ||||||||
| 560 | |||||||||
| 561 | // If the instruction is dead, we would try to sink it because it isn't | ||||||||
| 562 | // used in the loop, instead, just delete it. | ||||||||
| 563 | if (isInstructionTriviallyDead(&I, TLI)) { | ||||||||
| 564 | LLVM_DEBUG(dbgs() << "LICM deleting dead inst: " << I << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM deleting dead inst: " << I << '\n'; } } while (false); | ||||||||
| 565 | salvageKnowledge(&I); | ||||||||
| 566 | salvageDebugInfo(I); | ||||||||
| 567 | ++II; | ||||||||
| 568 | eraseInstruction(I, *SafetyInfo, CurAST, MSSAU); | ||||||||
| 569 | Changed = true; | ||||||||
| 570 | continue; | ||||||||
| 571 | } | ||||||||
| 572 | |||||||||
| 573 | // Check to see if we can sink this instruction to the exit blocks | ||||||||
| 574 | // of the loop. We can do this if the all users of the instruction are | ||||||||
| 575 | // outside of the loop. In this case, it doesn't even matter if the | ||||||||
| 576 | // operands of the instruction are loop invariant. | ||||||||
| 577 | // | ||||||||
| 578 | bool FreeInLoop = false; | ||||||||
| 579 | if (!I.mayHaveSideEffects() && | ||||||||
| 580 | isNotUsedOrFreeInLoop(I, CurLoop, SafetyInfo, TTI, FreeInLoop) && | ||||||||
| 581 | canSinkOrHoistInst(I, AA, DT, CurLoop, CurAST, MSSAU, true, &Flags, | ||||||||
| 582 | ORE)) { | ||||||||
| 583 | if (sink(I, LI, DT, BFI, CurLoop, SafetyInfo, MSSAU, ORE)) { | ||||||||
| 584 | if (!FreeInLoop) { | ||||||||
| 585 | ++II; | ||||||||
| 586 | salvageDebugInfo(I); | ||||||||
| 587 | eraseInstruction(I, *SafetyInfo, CurAST, MSSAU); | ||||||||
| 588 | } | ||||||||
| 589 | Changed = true; | ||||||||
| 590 | } | ||||||||
| 591 | } | ||||||||
| 592 | } | ||||||||
| 593 | } | ||||||||
| 594 | if (MSSAU && VerifyMemorySSA) | ||||||||
| 595 | MSSAU->getMemorySSA()->verifyMemorySSA(); | ||||||||
| 596 | return Changed; | ||||||||
| 597 | } | ||||||||
| 598 | |||||||||
| 599 | namespace { | ||||||||
| 600 | // This is a helper class for hoistRegion to make it able to hoist control flow | ||||||||
| 601 | // in order to be able to hoist phis. The way this works is that we initially | ||||||||
| 602 | // start hoisting to the loop preheader, and when we see a loop invariant branch | ||||||||
| 603 | // we make note of this. When we then come to hoist an instruction that's | ||||||||
| 604 | // conditional on such a branch we duplicate the branch and the relevant control | ||||||||
| 605 | // flow, then hoist the instruction into the block corresponding to its original | ||||||||
| 606 | // block in the duplicated control flow. | ||||||||
| 607 | class ControlFlowHoister { | ||||||||
| 608 | private: | ||||||||
| 609 | // Information about the loop we are hoisting from | ||||||||
| 610 | LoopInfo *LI; | ||||||||
| 611 | DominatorTree *DT; | ||||||||
| 612 | Loop *CurLoop; | ||||||||
| 613 | MemorySSAUpdater *MSSAU; | ||||||||
| 614 | |||||||||
| 615 | // A map of blocks in the loop to the block their instructions will be hoisted | ||||||||
| 616 | // to. | ||||||||
| 617 | DenseMap<BasicBlock *, BasicBlock *> HoistDestinationMap; | ||||||||
| 618 | |||||||||
| 619 | // The branches that we can hoist, mapped to the block that marks a | ||||||||
| 620 | // convergence point of their control flow. | ||||||||
| 621 | DenseMap<BranchInst *, BasicBlock *> HoistableBranches; | ||||||||
| 622 | |||||||||
| 623 | public: | ||||||||
| 624 | ControlFlowHoister(LoopInfo *LI, DominatorTree *DT, Loop *CurLoop, | ||||||||
| 625 | MemorySSAUpdater *MSSAU) | ||||||||
| 626 | : LI(LI), DT(DT), CurLoop(CurLoop), MSSAU(MSSAU) {} | ||||||||
| 627 | |||||||||
| 628 | void registerPossiblyHoistableBranch(BranchInst *BI) { | ||||||||
| 629 | // We can only hoist conditional branches with loop invariant operands. | ||||||||
| 630 | if (!ControlFlowHoisting || !BI->isConditional() || | ||||||||
| 631 | !CurLoop->hasLoopInvariantOperands(BI)) | ||||||||
| 632 | return; | ||||||||
| 633 | |||||||||
| 634 | // The branch destinations need to be in the loop, and we don't gain | ||||||||
| 635 | // anything by duplicating conditional branches with duplicate successors, | ||||||||
| 636 | // as it's essentially the same as an unconditional branch. | ||||||||
| 637 | BasicBlock *TrueDest = BI->getSuccessor(0); | ||||||||
| 638 | BasicBlock *FalseDest = BI->getSuccessor(1); | ||||||||
| 639 | if (!CurLoop->contains(TrueDest) || !CurLoop->contains(FalseDest) || | ||||||||
| 640 | TrueDest == FalseDest) | ||||||||
| 641 | return; | ||||||||
| 642 | |||||||||
| 643 | // We can hoist BI if one branch destination is the successor of the other, | ||||||||
| 644 | // or both have common successor which we check by seeing if the | ||||||||
| 645 | // intersection of their successors is non-empty. | ||||||||
| 646 | // TODO: This could be expanded to allowing branches where both ends | ||||||||
| 647 | // eventually converge to a single block. | ||||||||
| 648 | SmallPtrSet<BasicBlock *, 4> TrueDestSucc, FalseDestSucc; | ||||||||
| 649 | TrueDestSucc.insert(succ_begin(TrueDest), succ_end(TrueDest)); | ||||||||
| 650 | FalseDestSucc.insert(succ_begin(FalseDest), succ_end(FalseDest)); | ||||||||
| 651 | BasicBlock *CommonSucc = nullptr; | ||||||||
| 652 | if (TrueDestSucc.count(FalseDest)) { | ||||||||
| 653 | CommonSucc = FalseDest; | ||||||||
| 654 | } else if (FalseDestSucc.count(TrueDest)) { | ||||||||
| 655 | CommonSucc = TrueDest; | ||||||||
| 656 | } else { | ||||||||
| 657 | set_intersect(TrueDestSucc, FalseDestSucc); | ||||||||
| 658 | // If there's one common successor use that. | ||||||||
| 659 | if (TrueDestSucc.size() == 1) | ||||||||
| 660 | CommonSucc = *TrueDestSucc.begin(); | ||||||||
| 661 | // If there's more than one pick whichever appears first in the block list | ||||||||
| 662 | // (we can't use the value returned by TrueDestSucc.begin() as it's | ||||||||
| 663 | // unpredicatable which element gets returned). | ||||||||
| 664 | else if (!TrueDestSucc.empty()) { | ||||||||
| 665 | Function *F = TrueDest->getParent(); | ||||||||
| 666 | auto IsSucc = [&](BasicBlock &BB) { return TrueDestSucc.count(&BB); }; | ||||||||
| 667 | auto It = llvm::find_if(*F, IsSucc); | ||||||||
| 668 | assert(It != F->end() && "Could not find successor in function")((It != F->end() && "Could not find successor in function" ) ? static_cast<void> (0) : __assert_fail ("It != F->end() && \"Could not find successor in function\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 668, __PRETTY_FUNCTION__)); | ||||||||
| 669 | CommonSucc = &*It; | ||||||||
| 670 | } | ||||||||
| 671 | } | ||||||||
| 672 | // The common successor has to be dominated by the branch, as otherwise | ||||||||
| 673 | // there will be some other path to the successor that will not be | ||||||||
| 674 | // controlled by this branch so any phi we hoist would be controlled by the | ||||||||
| 675 | // wrong condition. This also takes care of avoiding hoisting of loop back | ||||||||
| 676 | // edges. | ||||||||
| 677 | // TODO: In some cases this could be relaxed if the successor is dominated | ||||||||
| 678 | // by another block that's been hoisted and we can guarantee that the | ||||||||
| 679 | // control flow has been replicated exactly. | ||||||||
| 680 | if (CommonSucc && DT->dominates(BI, CommonSucc)) | ||||||||
| 681 | HoistableBranches[BI] = CommonSucc; | ||||||||
| 682 | } | ||||||||
| 683 | |||||||||
| 684 | bool canHoistPHI(PHINode *PN) { | ||||||||
| 685 | // The phi must have loop invariant operands. | ||||||||
| 686 | if (!ControlFlowHoisting || !CurLoop->hasLoopInvariantOperands(PN)) | ||||||||
| 687 | return false; | ||||||||
| 688 | // We can hoist phis if the block they are in is the target of hoistable | ||||||||
| 689 | // branches which cover all of the predecessors of the block. | ||||||||
| 690 | SmallPtrSet<BasicBlock *, 8> PredecessorBlocks; | ||||||||
| 691 | BasicBlock *BB = PN->getParent(); | ||||||||
| 692 | for (BasicBlock *PredBB : predecessors(BB)) | ||||||||
| 693 | PredecessorBlocks.insert(PredBB); | ||||||||
| 694 | // If we have less predecessor blocks than predecessors then the phi will | ||||||||
| 695 | // have more than one incoming value for the same block which we can't | ||||||||
| 696 | // handle. | ||||||||
| 697 | // TODO: This could be handled be erasing some of the duplicate incoming | ||||||||
| 698 | // values. | ||||||||
| 699 | if (PredecessorBlocks.size() != pred_size(BB)) | ||||||||
| 700 | return false; | ||||||||
| 701 | for (auto &Pair : HoistableBranches) { | ||||||||
| 702 | if (Pair.second == BB) { | ||||||||
| 703 | // Which blocks are predecessors via this branch depends on if the | ||||||||
| 704 | // branch is triangle-like or diamond-like. | ||||||||
| 705 | if (Pair.first->getSuccessor(0) == BB) { | ||||||||
| 706 | PredecessorBlocks.erase(Pair.first->getParent()); | ||||||||
| 707 | PredecessorBlocks.erase(Pair.first->getSuccessor(1)); | ||||||||
| 708 | } else if (Pair.first->getSuccessor(1) == BB) { | ||||||||
| 709 | PredecessorBlocks.erase(Pair.first->getParent()); | ||||||||
| 710 | PredecessorBlocks.erase(Pair.first->getSuccessor(0)); | ||||||||
| 711 | } else { | ||||||||
| 712 | PredecessorBlocks.erase(Pair.first->getSuccessor(0)); | ||||||||
| 713 | PredecessorBlocks.erase(Pair.first->getSuccessor(1)); | ||||||||
| 714 | } | ||||||||
| 715 | } | ||||||||
| 716 | } | ||||||||
| 717 | // PredecessorBlocks will now be empty if for every predecessor of BB we | ||||||||
| 718 | // found a hoistable branch source. | ||||||||
| 719 | return PredecessorBlocks.empty(); | ||||||||
| 720 | } | ||||||||
| 721 | |||||||||
| 722 | BasicBlock *getOrCreateHoistedBlock(BasicBlock *BB) { | ||||||||
| 723 | if (!ControlFlowHoisting) | ||||||||
| 724 | return CurLoop->getLoopPreheader(); | ||||||||
| 725 | // If BB has already been hoisted, return that | ||||||||
| 726 | if (HoistDestinationMap.count(BB)) | ||||||||
| 727 | return HoistDestinationMap[BB]; | ||||||||
| 728 | |||||||||
| 729 | // Check if this block is conditional based on a pending branch | ||||||||
| 730 | auto HasBBAsSuccessor = | ||||||||
| 731 | [&](DenseMap<BranchInst *, BasicBlock *>::value_type &Pair) { | ||||||||
| 732 | return BB != Pair.second && (Pair.first->getSuccessor(0) == BB || | ||||||||
| 733 | Pair.first->getSuccessor(1) == BB); | ||||||||
| 734 | }; | ||||||||
| 735 | auto It = llvm::find_if(HoistableBranches, HasBBAsSuccessor); | ||||||||
| 736 | |||||||||
| 737 | // If not involved in a pending branch, hoist to preheader | ||||||||
| 738 | BasicBlock *InitialPreheader = CurLoop->getLoopPreheader(); | ||||||||
| 739 | if (It == HoistableBranches.end()) { | ||||||||
| 740 | LLVM_DEBUG(dbgs() << "LICM using "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM using " << InitialPreheader ->getNameOrAsOperand() << " as hoist destination for " << BB->getNameOrAsOperand() << "\n"; } } while (false) | ||||||||
| 741 | << InitialPreheader->getNameOrAsOperand()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM using " << InitialPreheader ->getNameOrAsOperand() << " as hoist destination for " << BB->getNameOrAsOperand() << "\n"; } } while (false) | ||||||||
| 742 | << " as hoist destination for "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM using " << InitialPreheader ->getNameOrAsOperand() << " as hoist destination for " << BB->getNameOrAsOperand() << "\n"; } } while (false) | ||||||||
| 743 | << BB->getNameOrAsOperand() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM using " << InitialPreheader ->getNameOrAsOperand() << " as hoist destination for " << BB->getNameOrAsOperand() << "\n"; } } while (false); | ||||||||
| 744 | HoistDestinationMap[BB] = InitialPreheader; | ||||||||
| 745 | return InitialPreheader; | ||||||||
| 746 | } | ||||||||
| 747 | BranchInst *BI = It->first; | ||||||||
| 748 | assert(std::find_if(++It, HoistableBranches.end(), HasBBAsSuccessor) ==((std::find_if(++It, HoistableBranches.end(), HasBBAsSuccessor ) == HoistableBranches.end() && "BB is expected to be the target of at most one branch" ) ? static_cast<void> (0) : __assert_fail ("std::find_if(++It, HoistableBranches.end(), HasBBAsSuccessor) == HoistableBranches.end() && \"BB is expected to be the target of at most one branch\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 750, __PRETTY_FUNCTION__)) | ||||||||
| 749 | HoistableBranches.end() &&((std::find_if(++It, HoistableBranches.end(), HasBBAsSuccessor ) == HoistableBranches.end() && "BB is expected to be the target of at most one branch" ) ? static_cast<void> (0) : __assert_fail ("std::find_if(++It, HoistableBranches.end(), HasBBAsSuccessor) == HoistableBranches.end() && \"BB is expected to be the target of at most one branch\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 750, __PRETTY_FUNCTION__)) | ||||||||
| 750 | "BB is expected to be the target of at most one branch")((std::find_if(++It, HoistableBranches.end(), HasBBAsSuccessor ) == HoistableBranches.end() && "BB is expected to be the target of at most one branch" ) ? static_cast<void> (0) : __assert_fail ("std::find_if(++It, HoistableBranches.end(), HasBBAsSuccessor) == HoistableBranches.end() && \"BB is expected to be the target of at most one branch\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 750, __PRETTY_FUNCTION__)); | ||||||||
| 751 | |||||||||
| 752 | LLVMContext &C = BB->getContext(); | ||||||||
| 753 | BasicBlock *TrueDest = BI->getSuccessor(0); | ||||||||
| 754 | BasicBlock *FalseDest = BI->getSuccessor(1); | ||||||||
| 755 | BasicBlock *CommonSucc = HoistableBranches[BI]; | ||||||||
| 756 | BasicBlock *HoistTarget = getOrCreateHoistedBlock(BI->getParent()); | ||||||||
| 757 | |||||||||
| 758 | // Create hoisted versions of blocks that currently don't have them | ||||||||
| 759 | auto CreateHoistedBlock = [&](BasicBlock *Orig) { | ||||||||
| 760 | if (HoistDestinationMap.count(Orig)) | ||||||||
| 761 | return HoistDestinationMap[Orig]; | ||||||||
| 762 | BasicBlock *New = | ||||||||
| 763 | BasicBlock::Create(C, Orig->getName() + ".licm", Orig->getParent()); | ||||||||
| 764 | HoistDestinationMap[Orig] = New; | ||||||||
| 765 | DT->addNewBlock(New, HoistTarget); | ||||||||
| 766 | if (CurLoop->getParentLoop()) | ||||||||
| 767 | CurLoop->getParentLoop()->addBasicBlockToLoop(New, *LI); | ||||||||
| 768 | ++NumCreatedBlocks; | ||||||||
| 769 | LLVM_DEBUG(dbgs() << "LICM created " << New->getName()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM created " << New-> getName() << " as hoist destination for " << Orig ->getName() << "\n"; } } while (false) | ||||||||
| 770 | << " as hoist destination for " << Orig->getName()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM created " << New-> getName() << " as hoist destination for " << Orig ->getName() << "\n"; } } while (false) | ||||||||
| 771 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM created " << New-> getName() << " as hoist destination for " << Orig ->getName() << "\n"; } } while (false); | ||||||||
| 772 | return New; | ||||||||
| 773 | }; | ||||||||
| 774 | BasicBlock *HoistTrueDest = CreateHoistedBlock(TrueDest); | ||||||||
| 775 | BasicBlock *HoistFalseDest = CreateHoistedBlock(FalseDest); | ||||||||
| 776 | BasicBlock *HoistCommonSucc = CreateHoistedBlock(CommonSucc); | ||||||||
| 777 | |||||||||
| 778 | // Link up these blocks with branches. | ||||||||
| 779 | if (!HoistCommonSucc->getTerminator()) { | ||||||||
| 780 | // The new common successor we've generated will branch to whatever that | ||||||||
| 781 | // hoist target branched to. | ||||||||
| 782 | BasicBlock *TargetSucc = HoistTarget->getSingleSuccessor(); | ||||||||
| 783 | assert(TargetSucc && "Expected hoist target to have a single successor")((TargetSucc && "Expected hoist target to have a single successor" ) ? static_cast<void> (0) : __assert_fail ("TargetSucc && \"Expected hoist target to have a single successor\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 783, __PRETTY_FUNCTION__)); | ||||||||
| 784 | HoistCommonSucc->moveBefore(TargetSucc); | ||||||||
| 785 | BranchInst::Create(TargetSucc, HoistCommonSucc); | ||||||||
| 786 | } | ||||||||
| 787 | if (!HoistTrueDest->getTerminator()) { | ||||||||
| 788 | HoistTrueDest->moveBefore(HoistCommonSucc); | ||||||||
| 789 | BranchInst::Create(HoistCommonSucc, HoistTrueDest); | ||||||||
| 790 | } | ||||||||
| 791 | if (!HoistFalseDest->getTerminator()) { | ||||||||
| 792 | HoistFalseDest->moveBefore(HoistCommonSucc); | ||||||||
| 793 | BranchInst::Create(HoistCommonSucc, HoistFalseDest); | ||||||||
| 794 | } | ||||||||
| 795 | |||||||||
| 796 | // If BI is being cloned to what was originally the preheader then | ||||||||
| 797 | // HoistCommonSucc will now be the new preheader. | ||||||||
| 798 | if (HoistTarget == InitialPreheader) { | ||||||||
| 799 | // Phis in the loop header now need to use the new preheader. | ||||||||
| 800 | InitialPreheader->replaceSuccessorsPhiUsesWith(HoistCommonSucc); | ||||||||
| 801 | if (MSSAU) | ||||||||
| 802 | MSSAU->wireOldPredecessorsToNewImmediatePredecessor( | ||||||||
| 803 | HoistTarget->getSingleSuccessor(), HoistCommonSucc, {HoistTarget}); | ||||||||
| 804 | // The new preheader dominates the loop header. | ||||||||
| 805 | DomTreeNode *PreheaderNode = DT->getNode(HoistCommonSucc); | ||||||||
| 806 | DomTreeNode *HeaderNode = DT->getNode(CurLoop->getHeader()); | ||||||||
| 807 | DT->changeImmediateDominator(HeaderNode, PreheaderNode); | ||||||||
| 808 | // The preheader hoist destination is now the new preheader, with the | ||||||||
| 809 | // exception of the hoist destination of this branch. | ||||||||
| 810 | for (auto &Pair : HoistDestinationMap) | ||||||||
| 811 | if (Pair.second == InitialPreheader && Pair.first != BI->getParent()) | ||||||||
| 812 | Pair.second = HoistCommonSucc; | ||||||||
| 813 | } | ||||||||
| 814 | |||||||||
| 815 | // Now finally clone BI. | ||||||||
| 816 | ReplaceInstWithInst( | ||||||||
| 817 | HoistTarget->getTerminator(), | ||||||||
| 818 | BranchInst::Create(HoistTrueDest, HoistFalseDest, BI->getCondition())); | ||||||||
| 819 | ++NumClonedBranches; | ||||||||
| 820 | |||||||||
| 821 | assert(CurLoop->getLoopPreheader() &&((CurLoop->getLoopPreheader() && "Hoisting blocks should not have destroyed preheader" ) ? static_cast<void> (0) : __assert_fail ("CurLoop->getLoopPreheader() && \"Hoisting blocks should not have destroyed preheader\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 822, __PRETTY_FUNCTION__)) | ||||||||
| 822 | "Hoisting blocks should not have destroyed preheader")((CurLoop->getLoopPreheader() && "Hoisting blocks should not have destroyed preheader" ) ? static_cast<void> (0) : __assert_fail ("CurLoop->getLoopPreheader() && \"Hoisting blocks should not have destroyed preheader\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 822, __PRETTY_FUNCTION__)); | ||||||||
| 823 | return HoistDestinationMap[BB]; | ||||||||
| 824 | } | ||||||||
| 825 | }; | ||||||||
| 826 | } // namespace | ||||||||
| 827 | |||||||||
| 828 | // Hoisting/sinking instruction out of a loop isn't always beneficial. It's only | ||||||||
| 829 | // only worthwhile if the destination block is actually colder than current | ||||||||
| 830 | // block. | ||||||||
| 831 | static bool worthSinkOrHoistInst(Instruction &I, BasicBlock *DstBlock, | ||||||||
| 832 | OptimizationRemarkEmitter *ORE, | ||||||||
| 833 | BlockFrequencyInfo *BFI) { | ||||||||
| 834 | // Check block frequency only when runtime profile is available | ||||||||
| 835 | // to avoid pathological cases. With static profile, lean towards | ||||||||
| 836 | // hosting because it helps canonicalize the loop for vectorizer. | ||||||||
| 837 | if (!DstBlock->getParent()->hasProfileData()) | ||||||||
| 838 | return true; | ||||||||
| 839 | |||||||||
| 840 | if (!HoistSinkColdnessThreshold || !BFI) | ||||||||
| 841 | return true; | ||||||||
| 842 | |||||||||
| 843 | BasicBlock *SrcBlock = I.getParent(); | ||||||||
| 844 | if (BFI->getBlockFreq(DstBlock).getFrequency() / HoistSinkColdnessThreshold > | ||||||||
| 845 | BFI->getBlockFreq(SrcBlock).getFrequency()) { | ||||||||
| 846 | ORE->emit([&]() { | ||||||||
| 847 | return OptimizationRemarkMissed(DEBUG_TYPE"licm", "SinkHoistInst", &I) | ||||||||
| 848 | << "failed to sink or hoist instruction because containing block " | ||||||||
| 849 | "has lower frequency than destination block"; | ||||||||
| 850 | }); | ||||||||
| 851 | return false; | ||||||||
| 852 | } | ||||||||
| 853 | |||||||||
| 854 | return true; | ||||||||
| 855 | } | ||||||||
| 856 | |||||||||
| 857 | /// Walk the specified region of the CFG (defined by all blocks dominated by | ||||||||
| 858 | /// the specified block, and that are in the current loop) in depth first | ||||||||
| 859 | /// order w.r.t the DominatorTree. This allows us to visit definitions before | ||||||||
| 860 | /// uses, allowing us to hoist a loop body in one pass without iteration. | ||||||||
| 861 | /// | ||||||||
| 862 | bool llvm::hoistRegion(DomTreeNode *N, AAResults *AA, LoopInfo *LI, | ||||||||
| 863 | DominatorTree *DT, BlockFrequencyInfo *BFI, | ||||||||
| 864 | TargetLibraryInfo *TLI, Loop *CurLoop, | ||||||||
| 865 | AliasSetTracker *CurAST, MemorySSAUpdater *MSSAU, | ||||||||
| 866 | ScalarEvolution *SE, ICFLoopSafetyInfo *SafetyInfo, | ||||||||
| 867 | SinkAndHoistLICMFlags &Flags, | ||||||||
| 868 | OptimizationRemarkEmitter *ORE) { | ||||||||
| 869 | // Verify inputs. | ||||||||
| 870 | assert(N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr &&((N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected input to hoistRegion." ) ? static_cast<void> (0) : __assert_fail ("N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected input to hoistRegion.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 872, __PRETTY_FUNCTION__)) | ||||||||
| 871 | CurLoop != nullptr && SafetyInfo != nullptr &&((N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected input to hoistRegion." ) ? static_cast<void> (0) : __assert_fail ("N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected input to hoistRegion.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 872, __PRETTY_FUNCTION__)) | ||||||||
| 872 | "Unexpected input to hoistRegion.")((N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected input to hoistRegion." ) ? static_cast<void> (0) : __assert_fail ("N != nullptr && AA != nullptr && LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected input to hoistRegion.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 872, __PRETTY_FUNCTION__)); | ||||||||
| 873 | assert(((CurAST != nullptr) ^ (MSSAU != nullptr)) &&((((CurAST != nullptr) ^ (MSSAU != nullptr)) && "Either AliasSetTracker or MemorySSA should be initialized." ) ? static_cast<void> (0) : __assert_fail ("((CurAST != nullptr) ^ (MSSAU != nullptr)) && \"Either AliasSetTracker or MemorySSA should be initialized.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 874, __PRETTY_FUNCTION__)) | ||||||||
| 874 | "Either AliasSetTracker or MemorySSA should be initialized.")((((CurAST != nullptr) ^ (MSSAU != nullptr)) && "Either AliasSetTracker or MemorySSA should be initialized." ) ? static_cast<void> (0) : __assert_fail ("((CurAST != nullptr) ^ (MSSAU != nullptr)) && \"Either AliasSetTracker or MemorySSA should be initialized.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 874, __PRETTY_FUNCTION__)); | ||||||||
| 875 | |||||||||
| 876 | ControlFlowHoister CFH(LI, DT, CurLoop, MSSAU); | ||||||||
| 877 | |||||||||
| 878 | // Keep track of instructions that have been hoisted, as they may need to be | ||||||||
| 879 | // re-hoisted if they end up not dominating all of their uses. | ||||||||
| 880 | SmallVector<Instruction *, 16> HoistedInstructions; | ||||||||
| 881 | |||||||||
| 882 | // For PHI hoisting to work we need to hoist blocks before their successors. | ||||||||
| 883 | // We can do this by iterating through the blocks in the loop in reverse | ||||||||
| 884 | // post-order. | ||||||||
| 885 | LoopBlocksRPO Worklist(CurLoop); | ||||||||
| 886 | Worklist.perform(LI); | ||||||||
| 887 | bool Changed = false; | ||||||||
| 888 | for (BasicBlock *BB : Worklist) { | ||||||||
| 889 | // Only need to process the contents of this block if it is not part of a | ||||||||
| 890 | // subloop (which would already have been processed). | ||||||||
| 891 | if (inSubLoop(BB, CurLoop, LI)) | ||||||||
| 892 | continue; | ||||||||
| 893 | |||||||||
| 894 | for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E;) { | ||||||||
| 895 | Instruction &I = *II++; | ||||||||
| 896 | // Try constant folding this instruction. If all the operands are | ||||||||
| 897 | // constants, it is technically hoistable, but it would be better to | ||||||||
| 898 | // just fold it. | ||||||||
| 899 | if (Constant *C = ConstantFoldInstruction( | ||||||||
| 900 | &I, I.getModule()->getDataLayout(), TLI)) { | ||||||||
| 901 | LLVM_DEBUG(dbgs() << "LICM folding inst: " << I << " --> " << *Cdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM folding inst: " << I << " --> " << *C << '\n'; } } while (false) | ||||||||
| 902 | << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM folding inst: " << I << " --> " << *C << '\n'; } } while (false); | ||||||||
| 903 | if (CurAST) | ||||||||
| 904 | CurAST->copyValue(&I, C); | ||||||||
| 905 | // FIXME MSSA: Such replacements may make accesses unoptimized (D51960). | ||||||||
| 906 | I.replaceAllUsesWith(C); | ||||||||
| 907 | if (isInstructionTriviallyDead(&I, TLI)) | ||||||||
| 908 | eraseInstruction(I, *SafetyInfo, CurAST, MSSAU); | ||||||||
| 909 | Changed = true; | ||||||||
| 910 | continue; | ||||||||
| 911 | } | ||||||||
| 912 | |||||||||
| 913 | // Try hoisting the instruction out to the preheader. We can only do | ||||||||
| 914 | // this if all of the operands of the instruction are loop invariant and | ||||||||
| 915 | // if it is safe to hoist the instruction. We also check block frequency | ||||||||
| 916 | // to make sure instruction only gets hoisted into colder blocks. | ||||||||
| 917 | // TODO: It may be safe to hoist if we are hoisting to a conditional block | ||||||||
| 918 | // and we have accurately duplicated the control flow from the loop header | ||||||||
| 919 | // to that block. | ||||||||
| 920 | if (CurLoop->hasLoopInvariantOperands(&I) && | ||||||||
| 921 | canSinkOrHoistInst(I, AA, DT, CurLoop, CurAST, MSSAU, true, &Flags, | ||||||||
| 922 | ORE) && | ||||||||
| 923 | worthSinkOrHoistInst(I, CurLoop->getLoopPreheader(), ORE, BFI) && | ||||||||
| 924 | isSafeToExecuteUnconditionally( | ||||||||
| 925 | I, DT, TLI, CurLoop, SafetyInfo, ORE, | ||||||||
| 926 | CurLoop->getLoopPreheader()->getTerminator())) { | ||||||||
| 927 | hoist(I, DT, CurLoop, CFH.getOrCreateHoistedBlock(BB), SafetyInfo, | ||||||||
| 928 | MSSAU, SE, ORE); | ||||||||
| 929 | HoistedInstructions.push_back(&I); | ||||||||
| 930 | Changed = true; | ||||||||
| 931 | continue; | ||||||||
| 932 | } | ||||||||
| 933 | |||||||||
| 934 | // Attempt to remove floating point division out of the loop by | ||||||||
| 935 | // converting it to a reciprocal multiplication. | ||||||||
| 936 | if (I.getOpcode() == Instruction::FDiv && I.hasAllowReciprocal() && | ||||||||
| 937 | CurLoop->isLoopInvariant(I.getOperand(1))) { | ||||||||
| 938 | auto Divisor = I.getOperand(1); | ||||||||
| 939 | auto One = llvm::ConstantFP::get(Divisor->getType(), 1.0); | ||||||||
| 940 | auto ReciprocalDivisor = BinaryOperator::CreateFDiv(One, Divisor); | ||||||||
| 941 | ReciprocalDivisor->setFastMathFlags(I.getFastMathFlags()); | ||||||||
| 942 | SafetyInfo->insertInstructionTo(ReciprocalDivisor, I.getParent()); | ||||||||
| 943 | ReciprocalDivisor->insertBefore(&I); | ||||||||
| 944 | |||||||||
| 945 | auto Product = | ||||||||
| 946 | BinaryOperator::CreateFMul(I.getOperand(0), ReciprocalDivisor); | ||||||||
| 947 | Product->setFastMathFlags(I.getFastMathFlags()); | ||||||||
| 948 | SafetyInfo->insertInstructionTo(Product, I.getParent()); | ||||||||
| 949 | Product->insertAfter(&I); | ||||||||
| 950 | I.replaceAllUsesWith(Product); | ||||||||
| 951 | eraseInstruction(I, *SafetyInfo, CurAST, MSSAU); | ||||||||
| 952 | |||||||||
| 953 | hoist(*ReciprocalDivisor, DT, CurLoop, CFH.getOrCreateHoistedBlock(BB), | ||||||||
| 954 | SafetyInfo, MSSAU, SE, ORE); | ||||||||
| 955 | HoistedInstructions.push_back(ReciprocalDivisor); | ||||||||
| 956 | Changed = true; | ||||||||
| 957 | continue; | ||||||||
| 958 | } | ||||||||
| 959 | |||||||||
| 960 | auto IsInvariantStart = [&](Instruction &I) { | ||||||||
| 961 | using namespace PatternMatch; | ||||||||
| 962 | return I.use_empty() && | ||||||||
| 963 | match(&I, m_Intrinsic<Intrinsic::invariant_start>()); | ||||||||
| 964 | }; | ||||||||
| 965 | auto MustExecuteWithoutWritesBefore = [&](Instruction &I) { | ||||||||
| 966 | return SafetyInfo->isGuaranteedToExecute(I, DT, CurLoop) && | ||||||||
| 967 | SafetyInfo->doesNotWriteMemoryBefore(I, CurLoop); | ||||||||
| 968 | }; | ||||||||
| 969 | if ((IsInvariantStart(I) || isGuard(&I)) && | ||||||||
| 970 | CurLoop->hasLoopInvariantOperands(&I) && | ||||||||
| 971 | MustExecuteWithoutWritesBefore(I)) { | ||||||||
| 972 | hoist(I, DT, CurLoop, CFH.getOrCreateHoistedBlock(BB), SafetyInfo, | ||||||||
| 973 | MSSAU, SE, ORE); | ||||||||
| 974 | HoistedInstructions.push_back(&I); | ||||||||
| 975 | Changed = true; | ||||||||
| 976 | continue; | ||||||||
| 977 | } | ||||||||
| 978 | |||||||||
| 979 | if (PHINode *PN = dyn_cast<PHINode>(&I)) { | ||||||||
| 980 | if (CFH.canHoistPHI(PN)) { | ||||||||
| 981 | // Redirect incoming blocks first to ensure that we create hoisted | ||||||||
| 982 | // versions of those blocks before we hoist the phi. | ||||||||
| 983 | for (unsigned int i = 0; i < PN->getNumIncomingValues(); ++i) | ||||||||
| 984 | PN->setIncomingBlock( | ||||||||
| 985 | i, CFH.getOrCreateHoistedBlock(PN->getIncomingBlock(i))); | ||||||||
| 986 | hoist(*PN, DT, CurLoop, CFH.getOrCreateHoistedBlock(BB), SafetyInfo, | ||||||||
| 987 | MSSAU, SE, ORE); | ||||||||
| 988 | assert(DT->dominates(PN, BB) && "Conditional PHIs not expected")((DT->dominates(PN, BB) && "Conditional PHIs not expected" ) ? static_cast<void> (0) : __assert_fail ("DT->dominates(PN, BB) && \"Conditional PHIs not expected\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 988, __PRETTY_FUNCTION__)); | ||||||||
| 989 | Changed = true; | ||||||||
| 990 | continue; | ||||||||
| 991 | } | ||||||||
| 992 | } | ||||||||
| 993 | |||||||||
| 994 | // Remember possibly hoistable branches so we can actually hoist them | ||||||||
| 995 | // later if needed. | ||||||||
| 996 | if (BranchInst *BI = dyn_cast<BranchInst>(&I)) | ||||||||
| 997 | CFH.registerPossiblyHoistableBranch(BI); | ||||||||
| 998 | } | ||||||||
| 999 | } | ||||||||
| 1000 | |||||||||
| 1001 | // If we hoisted instructions to a conditional block they may not dominate | ||||||||
| 1002 | // their uses that weren't hoisted (such as phis where some operands are not | ||||||||
| 1003 | // loop invariant). If so make them unconditional by moving them to their | ||||||||
| 1004 | // immediate dominator. We iterate through the instructions in reverse order | ||||||||
| 1005 | // which ensures that when we rehoist an instruction we rehoist its operands, | ||||||||
| 1006 | // and also keep track of where in the block we are rehoisting to to make sure | ||||||||
| 1007 | // that we rehoist instructions before the instructions that use them. | ||||||||
| 1008 | Instruction *HoistPoint = nullptr; | ||||||||
| 1009 | if (ControlFlowHoisting) { | ||||||||
| 1010 | for (Instruction *I : reverse(HoistedInstructions)) { | ||||||||
| 1011 | if (!llvm::all_of(I->uses(), | ||||||||
| 1012 | [&](Use &U) { return DT->dominates(I, U); })) { | ||||||||
| 1013 | BasicBlock *Dominator = | ||||||||
| 1014 | DT->getNode(I->getParent())->getIDom()->getBlock(); | ||||||||
| 1015 | if (!HoistPoint || !DT->dominates(HoistPoint->getParent(), Dominator)) { | ||||||||
| 1016 | if (HoistPoint) | ||||||||
| 1017 | assert(DT->dominates(Dominator, HoistPoint->getParent()) &&((DT->dominates(Dominator, HoistPoint->getParent()) && "New hoist point expected to dominate old hoist point") ? static_cast <void> (0) : __assert_fail ("DT->dominates(Dominator, HoistPoint->getParent()) && \"New hoist point expected to dominate old hoist point\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1018, __PRETTY_FUNCTION__)) | ||||||||
| 1018 | "New hoist point expected to dominate old hoist point")((DT->dominates(Dominator, HoistPoint->getParent()) && "New hoist point expected to dominate old hoist point") ? static_cast <void> (0) : __assert_fail ("DT->dominates(Dominator, HoistPoint->getParent()) && \"New hoist point expected to dominate old hoist point\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1018, __PRETTY_FUNCTION__)); | ||||||||
| 1019 | HoistPoint = Dominator->getTerminator(); | ||||||||
| 1020 | } | ||||||||
| 1021 | LLVM_DEBUG(dbgs() << "LICM rehoisting to "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM rehoisting to " << HoistPoint ->getParent()->getNameOrAsOperand() << ": " << *I << "\n"; } } while (false) | ||||||||
| 1022 | << HoistPoint->getParent()->getNameOrAsOperand()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM rehoisting to " << HoistPoint ->getParent()->getNameOrAsOperand() << ": " << *I << "\n"; } } while (false) | ||||||||
| 1023 | << ": " << *I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM rehoisting to " << HoistPoint ->getParent()->getNameOrAsOperand() << ": " << *I << "\n"; } } while (false); | ||||||||
| 1024 | moveInstructionBefore(*I, *HoistPoint, *SafetyInfo, MSSAU, SE); | ||||||||
| 1025 | HoistPoint = I; | ||||||||
| 1026 | Changed = true; | ||||||||
| 1027 | } | ||||||||
| 1028 | } | ||||||||
| 1029 | } | ||||||||
| 1030 | if (MSSAU && VerifyMemorySSA) | ||||||||
| 1031 | MSSAU->getMemorySSA()->verifyMemorySSA(); | ||||||||
| 1032 | |||||||||
| 1033 | // Now that we've finished hoisting make sure that LI and DT are still | ||||||||
| 1034 | // valid. | ||||||||
| 1035 | #ifdef EXPENSIVE_CHECKS | ||||||||
| 1036 | if (Changed) { | ||||||||
| 1037 | assert(DT->verify(DominatorTree::VerificationLevel::Fast) &&((DT->verify(DominatorTree::VerificationLevel::Fast) && "Dominator tree verification failed") ? static_cast<void> (0) : __assert_fail ("DT->verify(DominatorTree::VerificationLevel::Fast) && \"Dominator tree verification failed\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1038, __PRETTY_FUNCTION__)) | ||||||||
| 1038 | "Dominator tree verification failed")((DT->verify(DominatorTree::VerificationLevel::Fast) && "Dominator tree verification failed") ? static_cast<void> (0) : __assert_fail ("DT->verify(DominatorTree::VerificationLevel::Fast) && \"Dominator tree verification failed\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1038, __PRETTY_FUNCTION__)); | ||||||||
| 1039 | LI->verify(*DT); | ||||||||
| 1040 | } | ||||||||
| 1041 | #endif | ||||||||
| 1042 | |||||||||
| 1043 | return Changed; | ||||||||
| 1044 | } | ||||||||
| 1045 | |||||||||
| 1046 | // Return true if LI is invariant within scope of the loop. LI is invariant if | ||||||||
| 1047 | // CurLoop is dominated by an invariant.start representing the same memory | ||||||||
| 1048 | // location and size as the memory location LI loads from, and also the | ||||||||
| 1049 | // invariant.start has no uses. | ||||||||
| 1050 | static bool isLoadInvariantInLoop(LoadInst *LI, DominatorTree *DT, | ||||||||
| 1051 | Loop *CurLoop) { | ||||||||
| 1052 | Value *Addr = LI->getOperand(0); | ||||||||
| 1053 | const DataLayout &DL = LI->getModule()->getDataLayout(); | ||||||||
| 1054 | const TypeSize LocSizeInBits = DL.getTypeSizeInBits(LI->getType()); | ||||||||
| 1055 | |||||||||
| 1056 | // It is not currently possible for clang to generate an invariant.start | ||||||||
| 1057 | // intrinsic with scalable vector types because we don't support thread local | ||||||||
| 1058 | // sizeless types and we don't permit sizeless types in structs or classes. | ||||||||
| 1059 | // Furthermore, even if support is added for this in future the intrinsic | ||||||||
| 1060 | // itself is defined to have a size of -1 for variable sized objects. This | ||||||||
| 1061 | // makes it impossible to verify if the intrinsic envelops our region of | ||||||||
| 1062 | // interest. For example, both <vscale x 32 x i8> and <vscale x 16 x i8> | ||||||||
| 1063 | // types would have a -1 parameter, but the former is clearly double the size | ||||||||
| 1064 | // of the latter. | ||||||||
| 1065 | if (LocSizeInBits.isScalable()) | ||||||||
| 1066 | return false; | ||||||||
| 1067 | |||||||||
| 1068 | // if the type is i8 addrspace(x)*, we know this is the type of | ||||||||
| 1069 | // llvm.invariant.start operand | ||||||||
| 1070 | auto *PtrInt8Ty = PointerType::get(Type::getInt8Ty(LI->getContext()), | ||||||||
| 1071 | LI->getPointerAddressSpace()); | ||||||||
| 1072 | unsigned BitcastsVisited = 0; | ||||||||
| 1073 | // Look through bitcasts until we reach the i8* type (this is invariant.start | ||||||||
| 1074 | // operand type). | ||||||||
| 1075 | while (Addr->getType() != PtrInt8Ty) { | ||||||||
| 1076 | auto *BC = dyn_cast<BitCastInst>(Addr); | ||||||||
| 1077 | // Avoid traversing high number of bitcast uses. | ||||||||
| 1078 | if (++BitcastsVisited > MaxNumUsesTraversed || !BC) | ||||||||
| 1079 | return false; | ||||||||
| 1080 | Addr = BC->getOperand(0); | ||||||||
| 1081 | } | ||||||||
| 1082 | |||||||||
| 1083 | unsigned UsesVisited = 0; | ||||||||
| 1084 | // Traverse all uses of the load operand value, to see if invariant.start is | ||||||||
| 1085 | // one of the uses, and whether it dominates the load instruction. | ||||||||
| 1086 | for (auto *U : Addr->users()) { | ||||||||
| 1087 | // Avoid traversing for Load operand with high number of users. | ||||||||
| 1088 | if (++UsesVisited > MaxNumUsesTraversed) | ||||||||
| 1089 | return false; | ||||||||
| 1090 | IntrinsicInst *II = dyn_cast<IntrinsicInst>(U); | ||||||||
| 1091 | // If there are escaping uses of invariant.start instruction, the load maybe | ||||||||
| 1092 | // non-invariant. | ||||||||
| 1093 | if (!II || II->getIntrinsicID() != Intrinsic::invariant_start || | ||||||||
| 1094 | !II->use_empty()) | ||||||||
| 1095 | continue; | ||||||||
| 1096 | ConstantInt *InvariantSize = cast<ConstantInt>(II->getArgOperand(0)); | ||||||||
| 1097 | // The intrinsic supports having a -1 argument for variable sized objects | ||||||||
| 1098 | // so we should check for that here. | ||||||||
| 1099 | if (InvariantSize->isNegative()) | ||||||||
| 1100 | continue; | ||||||||
| 1101 | uint64_t InvariantSizeInBits = InvariantSize->getSExtValue() * 8; | ||||||||
| 1102 | // Confirm the invariant.start location size contains the load operand size | ||||||||
| 1103 | // in bits. Also, the invariant.start should dominate the load, and we | ||||||||
| 1104 | // should not hoist the load out of a loop that contains this dominating | ||||||||
| 1105 | // invariant.start. | ||||||||
| 1106 | if (LocSizeInBits.getFixedSize() <= InvariantSizeInBits && | ||||||||
| 1107 | DT->properlyDominates(II->getParent(), CurLoop->getHeader())) | ||||||||
| 1108 | return true; | ||||||||
| 1109 | } | ||||||||
| 1110 | |||||||||
| 1111 | return false; | ||||||||
| 1112 | } | ||||||||
| 1113 | |||||||||
| 1114 | namespace { | ||||||||
| 1115 | /// Return true if-and-only-if we know how to (mechanically) both hoist and | ||||||||
| 1116 | /// sink a given instruction out of a loop. Does not address legality | ||||||||
| 1117 | /// concerns such as aliasing or speculation safety. | ||||||||
| 1118 | bool isHoistableAndSinkableInst(Instruction &I) { | ||||||||
| 1119 | // Only these instructions are hoistable/sinkable. | ||||||||
| 1120 | return (isa<LoadInst>(I) || isa<StoreInst>(I) || isa<CallInst>(I) || | ||||||||
| 1121 | isa<FenceInst>(I) || isa<CastInst>(I) || isa<UnaryOperator>(I) || | ||||||||
| 1122 | isa<BinaryOperator>(I) || isa<SelectInst>(I) || | ||||||||
| 1123 | isa<GetElementPtrInst>(I) || isa<CmpInst>(I) || | ||||||||
| 1124 | isa<InsertElementInst>(I) || isa<ExtractElementInst>(I) || | ||||||||
| 1125 | isa<ShuffleVectorInst>(I) || isa<ExtractValueInst>(I) || | ||||||||
| 1126 | isa<InsertValueInst>(I) || isa<FreezeInst>(I)); | ||||||||
| 1127 | } | ||||||||
| 1128 | /// Return true if all of the alias sets within this AST are known not to | ||||||||
| 1129 | /// contain a Mod, or if MSSA knows thare are no MemoryDefs in the loop. | ||||||||
| 1130 | bool isReadOnly(AliasSetTracker *CurAST, const MemorySSAUpdater *MSSAU, | ||||||||
| 1131 | const Loop *L) { | ||||||||
| 1132 | if (CurAST) { | ||||||||
| 1133 | for (AliasSet &AS : *CurAST) { | ||||||||
| 1134 | if (!AS.isForwardingAliasSet() && AS.isMod()) { | ||||||||
| 1135 | return false; | ||||||||
| 1136 | } | ||||||||
| 1137 | } | ||||||||
| 1138 | return true; | ||||||||
| 1139 | } else { /*MSSAU*/ | ||||||||
| 1140 | for (auto *BB : L->getBlocks()) | ||||||||
| 1141 | if (MSSAU->getMemorySSA()->getBlockDefs(BB)) | ||||||||
| 1142 | return false; | ||||||||
| 1143 | return true; | ||||||||
| 1144 | } | ||||||||
| 1145 | } | ||||||||
| 1146 | |||||||||
| 1147 | /// Return true if I is the only Instruction with a MemoryAccess in L. | ||||||||
| 1148 | bool isOnlyMemoryAccess(const Instruction *I, const Loop *L, | ||||||||
| 1149 | const MemorySSAUpdater *MSSAU) { | ||||||||
| 1150 | for (auto *BB : L->getBlocks()) | ||||||||
| 1151 | if (auto *Accs = MSSAU->getMemorySSA()->getBlockAccesses(BB)) { | ||||||||
| 1152 | int NotAPhi = 0; | ||||||||
| 1153 | for (const auto &Acc : *Accs) { | ||||||||
| 1154 | if (isa<MemoryPhi>(&Acc)) | ||||||||
| 1155 | continue; | ||||||||
| 1156 | const auto *MUD = cast<MemoryUseOrDef>(&Acc); | ||||||||
| 1157 | if (MUD->getMemoryInst() != I || NotAPhi++ == 1) | ||||||||
| 1158 | return false; | ||||||||
| 1159 | } | ||||||||
| 1160 | } | ||||||||
| 1161 | return true; | ||||||||
| 1162 | } | ||||||||
| 1163 | } | ||||||||
| 1164 | |||||||||
| 1165 | bool llvm::canSinkOrHoistInst(Instruction &I, AAResults *AA, DominatorTree *DT, | ||||||||
| 1166 | Loop *CurLoop, AliasSetTracker *CurAST, | ||||||||
| 1167 | MemorySSAUpdater *MSSAU, | ||||||||
| 1168 | bool TargetExecutesOncePerLoop, | ||||||||
| 1169 | SinkAndHoistLICMFlags *Flags, | ||||||||
| 1170 | OptimizationRemarkEmitter *ORE) { | ||||||||
| 1171 | assert(((CurAST != nullptr) ^ (MSSAU != nullptr)) &&((((CurAST != nullptr) ^ (MSSAU != nullptr)) && "Either AliasSetTracker or MemorySSA should be initialized." ) ? static_cast<void> (0) : __assert_fail ("((CurAST != nullptr) ^ (MSSAU != nullptr)) && \"Either AliasSetTracker or MemorySSA should be initialized.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1172, __PRETTY_FUNCTION__)) | ||||||||
| |||||||||
| 1172 | "Either AliasSetTracker or MemorySSA should be initialized.")((((CurAST != nullptr) ^ (MSSAU != nullptr)) && "Either AliasSetTracker or MemorySSA should be initialized." ) ? static_cast<void> (0) : __assert_fail ("((CurAST != nullptr) ^ (MSSAU != nullptr)) && \"Either AliasSetTracker or MemorySSA should be initialized.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1172, __PRETTY_FUNCTION__)); | ||||||||
| 1173 | |||||||||
| 1174 | // If we don't understand the instruction, bail early. | ||||||||
| 1175 | if (!isHoistableAndSinkableInst(I)) | ||||||||
| 1176 | return false; | ||||||||
| 1177 | |||||||||
| 1178 | MemorySSA *MSSA = MSSAU
| ||||||||
| 1179 | if (MSSA) | ||||||||
| 1180 | assert(Flags != nullptr && "Flags cannot be null.")((Flags != nullptr && "Flags cannot be null.") ? static_cast <void> (0) : __assert_fail ("Flags != nullptr && \"Flags cannot be null.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1180, __PRETTY_FUNCTION__)); | ||||||||
| 1181 | |||||||||
| 1182 | // Loads have extra constraints we have to verify before we can hoist them. | ||||||||
| 1183 | if (LoadInst *LI
| ||||||||
| 1184 | if (!LI->isUnordered()) | ||||||||
| 1185 | return false; // Don't sink/hoist volatile or ordered atomic loads! | ||||||||
| 1186 | |||||||||
| 1187 | // Loads from constant memory are always safe to move, even if they end up | ||||||||
| 1188 | // in the same alias set as something that ends up being modified. | ||||||||
| 1189 | if (AA->pointsToConstantMemory(LI->getOperand(0))) | ||||||||
| 1190 | return true; | ||||||||
| 1191 | if (LI->hasMetadata(LLVMContext::MD_invariant_load)) | ||||||||
| 1192 | return true; | ||||||||
| 1193 | |||||||||
| 1194 | if (LI->isAtomic() && !TargetExecutesOncePerLoop) | ||||||||
| 1195 | return false; // Don't risk duplicating unordered loads | ||||||||
| 1196 | |||||||||
| 1197 | // This checks for an invariant.start dominating the load. | ||||||||
| 1198 | if (isLoadInvariantInLoop(LI, DT, CurLoop)) | ||||||||
| 1199 | return true; | ||||||||
| 1200 | |||||||||
| 1201 | bool Invalidated; | ||||||||
| 1202 | if (CurAST
| ||||||||
| 1203 | Invalidated = pointerInvalidatedByLoop(MemoryLocation::get(LI), CurAST, | ||||||||
| 1204 | CurLoop, AA); | ||||||||
| 1205 | else | ||||||||
| 1206 | Invalidated = pointerInvalidatedByLoopWithMSSA( | ||||||||
| 1207 | MSSA, cast<MemoryUse>(MSSA->getMemoryAccess(LI)), CurLoop, I, *Flags); | ||||||||
| |||||||||
| 1208 | // Check loop-invariant address because this may also be a sinkable load | ||||||||
| 1209 | // whose address is not necessarily loop-invariant. | ||||||||
| 1210 | if (ORE && Invalidated && CurLoop->isLoopInvariant(LI->getPointerOperand())) | ||||||||
| 1211 | ORE->emit([&]() { | ||||||||
| 1212 | return OptimizationRemarkMissed( | ||||||||
| 1213 | DEBUG_TYPE"licm", "LoadWithLoopInvariantAddressInvalidated", LI) | ||||||||
| 1214 | << "failed to move load with loop-invariant address " | ||||||||
| 1215 | "because the loop may invalidate its value"; | ||||||||
| 1216 | }); | ||||||||
| 1217 | |||||||||
| 1218 | return !Invalidated; | ||||||||
| 1219 | } else if (CallInst *CI = dyn_cast<CallInst>(&I)) { | ||||||||
| 1220 | // Don't sink or hoist dbg info; it's legal, but not useful. | ||||||||
| 1221 | if (isa<DbgInfoIntrinsic>(I)) | ||||||||
| 1222 | return false; | ||||||||
| 1223 | |||||||||
| 1224 | // Don't sink calls which can throw. | ||||||||
| 1225 | if (CI->mayThrow()) | ||||||||
| 1226 | return false; | ||||||||
| 1227 | |||||||||
| 1228 | // Convergent attribute has been used on operations that involve | ||||||||
| 1229 | // inter-thread communication which results are implicitly affected by the | ||||||||
| 1230 | // enclosing control flows. It is not safe to hoist or sink such operations | ||||||||
| 1231 | // across control flow. | ||||||||
| 1232 | if (CI->isConvergent()) | ||||||||
| 1233 | return false; | ||||||||
| 1234 | |||||||||
| 1235 | using namespace PatternMatch; | ||||||||
| 1236 | if (match(CI, m_Intrinsic<Intrinsic::assume>())) | ||||||||
| 1237 | // Assumes don't actually alias anything or throw | ||||||||
| 1238 | return true; | ||||||||
| 1239 | |||||||||
| 1240 | if (match(CI, m_Intrinsic<Intrinsic::experimental_widenable_condition>())) | ||||||||
| 1241 | // Widenable conditions don't actually alias anything or throw | ||||||||
| 1242 | return true; | ||||||||
| 1243 | |||||||||
| 1244 | // Handle simple cases by querying alias analysis. | ||||||||
| 1245 | FunctionModRefBehavior Behavior = AA->getModRefBehavior(CI); | ||||||||
| 1246 | if (Behavior == FMRB_DoesNotAccessMemory) | ||||||||
| 1247 | return true; | ||||||||
| 1248 | if (AAResults::onlyReadsMemory(Behavior)) { | ||||||||
| 1249 | // A readonly argmemonly function only reads from memory pointed to by | ||||||||
| 1250 | // it's arguments with arbitrary offsets. If we can prove there are no | ||||||||
| 1251 | // writes to this memory in the loop, we can hoist or sink. | ||||||||
| 1252 | if (AAResults::onlyAccessesArgPointees(Behavior)) { | ||||||||
| 1253 | // TODO: expand to writeable arguments | ||||||||
| 1254 | for (Value *Op : CI->arg_operands()) | ||||||||
| 1255 | if (Op->getType()->isPointerTy()) { | ||||||||
| 1256 | bool Invalidated; | ||||||||
| 1257 | if (CurAST) | ||||||||
| 1258 | Invalidated = pointerInvalidatedByLoop( | ||||||||
| 1259 | MemoryLocation::getBeforeOrAfter(Op), CurAST, CurLoop, AA); | ||||||||
| 1260 | else | ||||||||
| 1261 | Invalidated = pointerInvalidatedByLoopWithMSSA( | ||||||||
| 1262 | MSSA, cast<MemoryUse>(MSSA->getMemoryAccess(CI)), CurLoop, I, | ||||||||
| 1263 | *Flags); | ||||||||
| 1264 | if (Invalidated) | ||||||||
| 1265 | return false; | ||||||||
| 1266 | } | ||||||||
| 1267 | return true; | ||||||||
| 1268 | } | ||||||||
| 1269 | |||||||||
| 1270 | // If this call only reads from memory and there are no writes to memory | ||||||||
| 1271 | // in the loop, we can hoist or sink the call as appropriate. | ||||||||
| 1272 | if (isReadOnly(CurAST, MSSAU, CurLoop)) | ||||||||
| 1273 | return true; | ||||||||
| 1274 | } | ||||||||
| 1275 | |||||||||
| 1276 | // FIXME: This should use mod/ref information to see if we can hoist or | ||||||||
| 1277 | // sink the call. | ||||||||
| 1278 | |||||||||
| 1279 | return false; | ||||||||
| 1280 | } else if (auto *FI = dyn_cast<FenceInst>(&I)) { | ||||||||
| 1281 | // Fences alias (most) everything to provide ordering. For the moment, | ||||||||
| 1282 | // just give up if there are any other memory operations in the loop. | ||||||||
| 1283 | if (CurAST) { | ||||||||
| 1284 | auto Begin = CurAST->begin(); | ||||||||
| 1285 | assert(Begin != CurAST->end() && "must contain FI")((Begin != CurAST->end() && "must contain FI") ? static_cast <void> (0) : __assert_fail ("Begin != CurAST->end() && \"must contain FI\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1285, __PRETTY_FUNCTION__)); | ||||||||
| 1286 | if (std::next(Begin) != CurAST->end()) | ||||||||
| 1287 | // constant memory for instance, TODO: handle better | ||||||||
| 1288 | return false; | ||||||||
| 1289 | auto *UniqueI = Begin->getUniqueInstruction(); | ||||||||
| 1290 | if (!UniqueI) | ||||||||
| 1291 | // other memory op, give up | ||||||||
| 1292 | return false; | ||||||||
| 1293 | (void)FI; // suppress unused variable warning | ||||||||
| 1294 | assert(UniqueI == FI && "AS must contain FI")((UniqueI == FI && "AS must contain FI") ? static_cast <void> (0) : __assert_fail ("UniqueI == FI && \"AS must contain FI\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1294, __PRETTY_FUNCTION__)); | ||||||||
| 1295 | return true; | ||||||||
| 1296 | } else // MSSAU | ||||||||
| 1297 | return isOnlyMemoryAccess(FI, CurLoop, MSSAU); | ||||||||
| 1298 | } else if (auto *SI = dyn_cast<StoreInst>(&I)) { | ||||||||
| 1299 | if (!SI->isUnordered()) | ||||||||
| 1300 | return false; // Don't sink/hoist volatile or ordered atomic store! | ||||||||
| 1301 | |||||||||
| 1302 | // We can only hoist a store that we can prove writes a value which is not | ||||||||
| 1303 | // read or overwritten within the loop. For those cases, we fallback to | ||||||||
| 1304 | // load store promotion instead. TODO: We can extend this to cases where | ||||||||
| 1305 | // there is exactly one write to the location and that write dominates an | ||||||||
| 1306 | // arbitrary number of reads in the loop. | ||||||||
| 1307 | if (CurAST) { | ||||||||
| 1308 | auto &AS = CurAST->getAliasSetFor(MemoryLocation::get(SI)); | ||||||||
| 1309 | |||||||||
| 1310 | if (AS.isRef() || !AS.isMustAlias()) | ||||||||
| 1311 | // Quick exit test, handled by the full path below as well. | ||||||||
| 1312 | return false; | ||||||||
| 1313 | auto *UniqueI = AS.getUniqueInstruction(); | ||||||||
| 1314 | if (!UniqueI) | ||||||||
| 1315 | // other memory op, give up | ||||||||
| 1316 | return false; | ||||||||
| 1317 | assert(UniqueI == SI && "AS must contain SI")((UniqueI == SI && "AS must contain SI") ? static_cast <void> (0) : __assert_fail ("UniqueI == SI && \"AS must contain SI\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1317, __PRETTY_FUNCTION__)); | ||||||||
| 1318 | return true; | ||||||||
| 1319 | } else { // MSSAU | ||||||||
| 1320 | if (isOnlyMemoryAccess(SI, CurLoop, MSSAU)) | ||||||||
| 1321 | return true; | ||||||||
| 1322 | // If there are more accesses than the Promotion cap or no "quota" to | ||||||||
| 1323 | // check clobber, then give up as we're not walking a list that long. | ||||||||
| 1324 | if (Flags->tooManyMemoryAccesses() || Flags->tooManyClobberingCalls()) | ||||||||
| 1325 | return false; | ||||||||
| 1326 | // If there are interfering Uses (i.e. their defining access is in the | ||||||||
| 1327 | // loop), or ordered loads (stored as Defs!), don't move this store. | ||||||||
| 1328 | // Could do better here, but this is conservatively correct. | ||||||||
| 1329 | // TODO: Cache set of Uses on the first walk in runOnLoop, update when | ||||||||
| 1330 | // moving accesses. Can also extend to dominating uses. | ||||||||
| 1331 | auto *SIMD = MSSA->getMemoryAccess(SI); | ||||||||
| 1332 | for (auto *BB : CurLoop->getBlocks()) | ||||||||
| 1333 | if (auto *Accesses = MSSA->getBlockAccesses(BB)) { | ||||||||
| 1334 | for (const auto &MA : *Accesses) | ||||||||
| 1335 | if (const auto *MU = dyn_cast<MemoryUse>(&MA)) { | ||||||||
| 1336 | auto *MD = MU->getDefiningAccess(); | ||||||||
| 1337 | if (!MSSA->isLiveOnEntryDef(MD) && | ||||||||
| 1338 | CurLoop->contains(MD->getBlock())) | ||||||||
| 1339 | return false; | ||||||||
| 1340 | // Disable hoisting past potentially interfering loads. Optimized | ||||||||
| 1341 | // Uses may point to an access outside the loop, as getClobbering | ||||||||
| 1342 | // checks the previous iteration when walking the backedge. | ||||||||
| 1343 | // FIXME: More precise: no Uses that alias SI. | ||||||||
| 1344 | if (!Flags->getIsSink() && !MSSA->dominates(SIMD, MU)) | ||||||||
| 1345 | return false; | ||||||||
| 1346 | } else if (const auto *MD = dyn_cast<MemoryDef>(&MA)) { | ||||||||
| 1347 | if (auto *LI = dyn_cast<LoadInst>(MD->getMemoryInst())) { | ||||||||
| 1348 | (void)LI; // Silence warning. | ||||||||
| 1349 | assert(!LI->isUnordered() && "Expected unordered load")((!LI->isUnordered() && "Expected unordered load") ? static_cast<void> (0) : __assert_fail ("!LI->isUnordered() && \"Expected unordered load\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1349, __PRETTY_FUNCTION__)); | ||||||||
| 1350 | return false; | ||||||||
| 1351 | } | ||||||||
| 1352 | // Any call, while it may not be clobbering SI, it may be a use. | ||||||||
| 1353 | if (auto *CI = dyn_cast<CallInst>(MD->getMemoryInst())) { | ||||||||
| 1354 | // Check if the call may read from the memory locattion written | ||||||||
| 1355 | // to by SI. Check CI's attributes and arguments; the number of | ||||||||
| 1356 | // such checks performed is limited above by NoOfMemAccTooLarge. | ||||||||
| 1357 | ModRefInfo MRI = AA->getModRefInfo(CI, MemoryLocation::get(SI)); | ||||||||
| 1358 | if (isModOrRefSet(MRI)) | ||||||||
| 1359 | return false; | ||||||||
| 1360 | } | ||||||||
| 1361 | } | ||||||||
| 1362 | } | ||||||||
| 1363 | auto *Source = MSSA->getSkipSelfWalker()->getClobberingMemoryAccess(SI); | ||||||||
| 1364 | Flags->incrementClobberingCalls(); | ||||||||
| 1365 | // If there are no clobbering Defs in the loop, store is safe to hoist. | ||||||||
| 1366 | return MSSA->isLiveOnEntryDef(Source) || | ||||||||
| 1367 | !CurLoop->contains(Source->getBlock()); | ||||||||
| 1368 | } | ||||||||
| 1369 | } | ||||||||
| 1370 | |||||||||
| 1371 | assert(!I.mayReadOrWriteMemory() && "unhandled aliasing")((!I.mayReadOrWriteMemory() && "unhandled aliasing") ? static_cast<void> (0) : __assert_fail ("!I.mayReadOrWriteMemory() && \"unhandled aliasing\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1371, __PRETTY_FUNCTION__)); | ||||||||
| 1372 | |||||||||
| 1373 | // We've established mechanical ability and aliasing, it's up to the caller | ||||||||
| 1374 | // to check fault safety | ||||||||
| 1375 | return true; | ||||||||
| 1376 | } | ||||||||
| 1377 | |||||||||
| 1378 | /// Returns true if a PHINode is a trivially replaceable with an | ||||||||
| 1379 | /// Instruction. | ||||||||
| 1380 | /// This is true when all incoming values are that instruction. | ||||||||
| 1381 | /// This pattern occurs most often with LCSSA PHI nodes. | ||||||||
| 1382 | /// | ||||||||
| 1383 | static bool isTriviallyReplaceablePHI(const PHINode &PN, const Instruction &I) { | ||||||||
| 1384 | for (const Value *IncValue : PN.incoming_values()) | ||||||||
| 1385 | if (IncValue != &I) | ||||||||
| 1386 | return false; | ||||||||
| 1387 | |||||||||
| 1388 | return true; | ||||||||
| 1389 | } | ||||||||
| 1390 | |||||||||
| 1391 | /// Return true if the instruction is free in the loop. | ||||||||
| 1392 | static bool isFreeInLoop(const Instruction &I, const Loop *CurLoop, | ||||||||
| 1393 | const TargetTransformInfo *TTI) { | ||||||||
| 1394 | |||||||||
| 1395 | if (const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&I)) { | ||||||||
| 1396 | if (TTI->getUserCost(GEP, TargetTransformInfo::TCK_SizeAndLatency) != | ||||||||
| 1397 | TargetTransformInfo::TCC_Free) | ||||||||
| 1398 | return false; | ||||||||
| 1399 | // For a GEP, we cannot simply use getUserCost because currently it | ||||||||
| 1400 | // optimistically assume that a GEP will fold into addressing mode | ||||||||
| 1401 | // regardless of its users. | ||||||||
| 1402 | const BasicBlock *BB = GEP->getParent(); | ||||||||
| 1403 | for (const User *U : GEP->users()) { | ||||||||
| 1404 | const Instruction *UI = cast<Instruction>(U); | ||||||||
| 1405 | if (CurLoop->contains(UI) && | ||||||||
| 1406 | (BB != UI->getParent() || | ||||||||
| 1407 | (!isa<StoreInst>(UI) && !isa<LoadInst>(UI)))) | ||||||||
| 1408 | return false; | ||||||||
| 1409 | } | ||||||||
| 1410 | return true; | ||||||||
| 1411 | } else | ||||||||
| 1412 | return TTI->getUserCost(&I, TargetTransformInfo::TCK_SizeAndLatency) == | ||||||||
| 1413 | TargetTransformInfo::TCC_Free; | ||||||||
| 1414 | } | ||||||||
| 1415 | |||||||||
| 1416 | /// Return true if the only users of this instruction are outside of | ||||||||
| 1417 | /// the loop. If this is true, we can sink the instruction to the exit | ||||||||
| 1418 | /// blocks of the loop. | ||||||||
| 1419 | /// | ||||||||
| 1420 | /// We also return true if the instruction could be folded away in lowering. | ||||||||
| 1421 | /// (e.g., a GEP can be folded into a load as an addressing mode in the loop). | ||||||||
| 1422 | static bool isNotUsedOrFreeInLoop(const Instruction &I, const Loop *CurLoop, | ||||||||
| 1423 | const LoopSafetyInfo *SafetyInfo, | ||||||||
| 1424 | TargetTransformInfo *TTI, bool &FreeInLoop) { | ||||||||
| 1425 | const auto &BlockColors = SafetyInfo->getBlockColors(); | ||||||||
| 1426 | bool IsFree = isFreeInLoop(I, CurLoop, TTI); | ||||||||
| 1427 | for (const User *U : I.users()) { | ||||||||
| 1428 | const Instruction *UI = cast<Instruction>(U); | ||||||||
| 1429 | if (const PHINode *PN = dyn_cast<PHINode>(UI)) { | ||||||||
| 1430 | const BasicBlock *BB = PN->getParent(); | ||||||||
| 1431 | // We cannot sink uses in catchswitches. | ||||||||
| 1432 | if (isa<CatchSwitchInst>(BB->getTerminator())) | ||||||||
| 1433 | return false; | ||||||||
| 1434 | |||||||||
| 1435 | // We need to sink a callsite to a unique funclet. Avoid sinking if the | ||||||||
| 1436 | // phi use is too muddled. | ||||||||
| 1437 | if (isa<CallInst>(I)) | ||||||||
| 1438 | if (!BlockColors.empty() && | ||||||||
| 1439 | BlockColors.find(const_cast<BasicBlock *>(BB))->second.size() != 1) | ||||||||
| 1440 | return false; | ||||||||
| 1441 | } | ||||||||
| 1442 | |||||||||
| 1443 | if (CurLoop->contains(UI)) { | ||||||||
| 1444 | if (IsFree) { | ||||||||
| 1445 | FreeInLoop = true; | ||||||||
| 1446 | continue; | ||||||||
| 1447 | } | ||||||||
| 1448 | return false; | ||||||||
| 1449 | } | ||||||||
| 1450 | } | ||||||||
| 1451 | return true; | ||||||||
| 1452 | } | ||||||||
| 1453 | |||||||||
| 1454 | static Instruction *cloneInstructionInExitBlock( | ||||||||
| 1455 | Instruction &I, BasicBlock &ExitBlock, PHINode &PN, const LoopInfo *LI, | ||||||||
| 1456 | const LoopSafetyInfo *SafetyInfo, MemorySSAUpdater *MSSAU) { | ||||||||
| 1457 | Instruction *New; | ||||||||
| 1458 | if (auto *CI = dyn_cast<CallInst>(&I)) { | ||||||||
| 1459 | const auto &BlockColors = SafetyInfo->getBlockColors(); | ||||||||
| 1460 | |||||||||
| 1461 | // Sinking call-sites need to be handled differently from other | ||||||||
| 1462 | // instructions. The cloned call-site needs a funclet bundle operand | ||||||||
| 1463 | // appropriate for its location in the CFG. | ||||||||
| 1464 | SmallVector<OperandBundleDef, 1> OpBundles; | ||||||||
| 1465 | for (unsigned BundleIdx = 0, BundleEnd = CI->getNumOperandBundles(); | ||||||||
| 1466 | BundleIdx != BundleEnd; ++BundleIdx) { | ||||||||
| 1467 | OperandBundleUse Bundle = CI->getOperandBundleAt(BundleIdx); | ||||||||
| 1468 | if (Bundle.getTagID() == LLVMContext::OB_funclet) | ||||||||
| 1469 | continue; | ||||||||
| 1470 | |||||||||
| 1471 | OpBundles.emplace_back(Bundle); | ||||||||
| 1472 | } | ||||||||
| 1473 | |||||||||
| 1474 | if (!BlockColors.empty()) { | ||||||||
| 1475 | const ColorVector &CV = BlockColors.find(&ExitBlock)->second; | ||||||||
| 1476 | assert(CV.size() == 1 && "non-unique color for exit block!")((CV.size() == 1 && "non-unique color for exit block!" ) ? static_cast<void> (0) : __assert_fail ("CV.size() == 1 && \"non-unique color for exit block!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1476, __PRETTY_FUNCTION__)); | ||||||||
| 1477 | BasicBlock *BBColor = CV.front(); | ||||||||
| 1478 | Instruction *EHPad = BBColor->getFirstNonPHI(); | ||||||||
| 1479 | if (EHPad->isEHPad()) | ||||||||
| 1480 | OpBundles.emplace_back("funclet", EHPad); | ||||||||
| 1481 | } | ||||||||
| 1482 | |||||||||
| 1483 | New = CallInst::Create(CI, OpBundles); | ||||||||
| 1484 | } else { | ||||||||
| 1485 | New = I.clone(); | ||||||||
| 1486 | } | ||||||||
| 1487 | |||||||||
| 1488 | ExitBlock.getInstList().insert(ExitBlock.getFirstInsertionPt(), New); | ||||||||
| 1489 | if (!I.getName().empty()) | ||||||||
| 1490 | New->setName(I.getName() + ".le"); | ||||||||
| 1491 | |||||||||
| 1492 | if (MSSAU && MSSAU->getMemorySSA()->getMemoryAccess(&I)) { | ||||||||
| 1493 | // Create a new MemoryAccess and let MemorySSA set its defining access. | ||||||||
| 1494 | MemoryAccess *NewMemAcc = MSSAU->createMemoryAccessInBB( | ||||||||
| 1495 | New, nullptr, New->getParent(), MemorySSA::Beginning); | ||||||||
| 1496 | if (NewMemAcc) { | ||||||||
| 1497 | if (auto *MemDef = dyn_cast<MemoryDef>(NewMemAcc)) | ||||||||
| 1498 | MSSAU->insertDef(MemDef, /*RenameUses=*/true); | ||||||||
| 1499 | else { | ||||||||
| 1500 | auto *MemUse = cast<MemoryUse>(NewMemAcc); | ||||||||
| 1501 | MSSAU->insertUse(MemUse, /*RenameUses=*/true); | ||||||||
| 1502 | } | ||||||||
| 1503 | } | ||||||||
| 1504 | } | ||||||||
| 1505 | |||||||||
| 1506 | // Build LCSSA PHI nodes for any in-loop operands (if legal). Note that | ||||||||
| 1507 | // this is particularly cheap because we can rip off the PHI node that we're | ||||||||
| 1508 | // replacing for the number and blocks of the predecessors. | ||||||||
| 1509 | // OPT: If this shows up in a profile, we can instead finish sinking all | ||||||||
| 1510 | // invariant instructions, and then walk their operands to re-establish | ||||||||
| 1511 | // LCSSA. That will eliminate creating PHI nodes just to nuke them when | ||||||||
| 1512 | // sinking bottom-up. | ||||||||
| 1513 | for (Use &Op : New->operands()) | ||||||||
| 1514 | if (LI->wouldBeOutOfLoopUseRequiringLCSSA(Op.get(), PN.getParent())) { | ||||||||
| 1515 | auto *OInst = cast<Instruction>(Op.get()); | ||||||||
| 1516 | PHINode *OpPN = | ||||||||
| 1517 | PHINode::Create(OInst->getType(), PN.getNumIncomingValues(), | ||||||||
| 1518 | OInst->getName() + ".lcssa", &ExitBlock.front()); | ||||||||
| 1519 | for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) | ||||||||
| 1520 | OpPN->addIncoming(OInst, PN.getIncomingBlock(i)); | ||||||||
| 1521 | Op = OpPN; | ||||||||
| 1522 | } | ||||||||
| 1523 | return New; | ||||||||
| 1524 | } | ||||||||
| 1525 | |||||||||
| 1526 | static void eraseInstruction(Instruction &I, ICFLoopSafetyInfo &SafetyInfo, | ||||||||
| 1527 | AliasSetTracker *AST, MemorySSAUpdater *MSSAU) { | ||||||||
| 1528 | if (AST) | ||||||||
| 1529 | AST->deleteValue(&I); | ||||||||
| 1530 | if (MSSAU) | ||||||||
| 1531 | MSSAU->removeMemoryAccess(&I); | ||||||||
| 1532 | SafetyInfo.removeInstruction(&I); | ||||||||
| 1533 | I.eraseFromParent(); | ||||||||
| 1534 | } | ||||||||
| 1535 | |||||||||
| 1536 | static void moveInstructionBefore(Instruction &I, Instruction &Dest, | ||||||||
| 1537 | ICFLoopSafetyInfo &SafetyInfo, | ||||||||
| 1538 | MemorySSAUpdater *MSSAU, | ||||||||
| 1539 | ScalarEvolution *SE) { | ||||||||
| 1540 | SafetyInfo.removeInstruction(&I); | ||||||||
| 1541 | SafetyInfo.insertInstructionTo(&I, Dest.getParent()); | ||||||||
| 1542 | I.moveBefore(&Dest); | ||||||||
| 1543 | if (MSSAU) | ||||||||
| 1544 | if (MemoryUseOrDef *OldMemAcc = cast_or_null<MemoryUseOrDef>( | ||||||||
| 1545 | MSSAU->getMemorySSA()->getMemoryAccess(&I))) | ||||||||
| 1546 | MSSAU->moveToPlace(OldMemAcc, Dest.getParent(), | ||||||||
| 1547 | MemorySSA::BeforeTerminator); | ||||||||
| 1548 | if (SE) | ||||||||
| 1549 | SE->forgetValue(&I); | ||||||||
| 1550 | } | ||||||||
| 1551 | |||||||||
| 1552 | static Instruction *sinkThroughTriviallyReplaceablePHI( | ||||||||
| 1553 | PHINode *TPN, Instruction *I, LoopInfo *LI, | ||||||||
| 1554 | SmallDenseMap<BasicBlock *, Instruction *, 32> &SunkCopies, | ||||||||
| 1555 | const LoopSafetyInfo *SafetyInfo, const Loop *CurLoop, | ||||||||
| 1556 | MemorySSAUpdater *MSSAU) { | ||||||||
| 1557 | assert(isTriviallyReplaceablePHI(*TPN, *I) &&((isTriviallyReplaceablePHI(*TPN, *I) && "Expect only trivially replaceable PHI" ) ? static_cast<void> (0) : __assert_fail ("isTriviallyReplaceablePHI(*TPN, *I) && \"Expect only trivially replaceable PHI\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1558, __PRETTY_FUNCTION__)) | ||||||||
| 1558 | "Expect only trivially replaceable PHI")((isTriviallyReplaceablePHI(*TPN, *I) && "Expect only trivially replaceable PHI" ) ? static_cast<void> (0) : __assert_fail ("isTriviallyReplaceablePHI(*TPN, *I) && \"Expect only trivially replaceable PHI\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1558, __PRETTY_FUNCTION__)); | ||||||||
| 1559 | BasicBlock *ExitBlock = TPN->getParent(); | ||||||||
| 1560 | Instruction *New; | ||||||||
| 1561 | auto It = SunkCopies.find(ExitBlock); | ||||||||
| 1562 | if (It != SunkCopies.end()) | ||||||||
| 1563 | New = It->second; | ||||||||
| 1564 | else | ||||||||
| 1565 | New = SunkCopies[ExitBlock] = cloneInstructionInExitBlock( | ||||||||
| 1566 | *I, *ExitBlock, *TPN, LI, SafetyInfo, MSSAU); | ||||||||
| 1567 | return New; | ||||||||
| 1568 | } | ||||||||
| 1569 | |||||||||
| 1570 | static bool canSplitPredecessors(PHINode *PN, LoopSafetyInfo *SafetyInfo) { | ||||||||
| 1571 | BasicBlock *BB = PN->getParent(); | ||||||||
| 1572 | if (!BB->canSplitPredecessors()) | ||||||||
| 1573 | return false; | ||||||||
| 1574 | // It's not impossible to split EHPad blocks, but if BlockColors already exist | ||||||||
| 1575 | // it require updating BlockColors for all offspring blocks accordingly. By | ||||||||
| 1576 | // skipping such corner case, we can make updating BlockColors after splitting | ||||||||
| 1577 | // predecessor fairly simple. | ||||||||
| 1578 | if (!SafetyInfo->getBlockColors().empty() && BB->getFirstNonPHI()->isEHPad()) | ||||||||
| 1579 | return false; | ||||||||
| 1580 | for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) { | ||||||||
| 1581 | BasicBlock *BBPred = *PI; | ||||||||
| 1582 | if (isa<IndirectBrInst>(BBPred->getTerminator()) || | ||||||||
| 1583 | isa<CallBrInst>(BBPred->getTerminator())) | ||||||||
| 1584 | return false; | ||||||||
| 1585 | } | ||||||||
| 1586 | return true; | ||||||||
| 1587 | } | ||||||||
| 1588 | |||||||||
| 1589 | static void splitPredecessorsOfLoopExit(PHINode *PN, DominatorTree *DT, | ||||||||
| 1590 | LoopInfo *LI, const Loop *CurLoop, | ||||||||
| 1591 | LoopSafetyInfo *SafetyInfo, | ||||||||
| 1592 | MemorySSAUpdater *MSSAU) { | ||||||||
| 1593 | #ifndef NDEBUG | ||||||||
| 1594 | SmallVector<BasicBlock *, 32> ExitBlocks; | ||||||||
| 1595 | CurLoop->getUniqueExitBlocks(ExitBlocks); | ||||||||
| 1596 | SmallPtrSet<BasicBlock *, 32> ExitBlockSet(ExitBlocks.begin(), | ||||||||
| 1597 | ExitBlocks.end()); | ||||||||
| 1598 | #endif | ||||||||
| 1599 | BasicBlock *ExitBB = PN->getParent(); | ||||||||
| 1600 | assert(ExitBlockSet.count(ExitBB) && "Expect the PHI is in an exit block.")((ExitBlockSet.count(ExitBB) && "Expect the PHI is in an exit block." ) ? static_cast<void> (0) : __assert_fail ("ExitBlockSet.count(ExitBB) && \"Expect the PHI is in an exit block.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1600, __PRETTY_FUNCTION__)); | ||||||||
| 1601 | |||||||||
| 1602 | // Split predecessors of the loop exit to make instructions in the loop are | ||||||||
| 1603 | // exposed to exit blocks through trivially replaceable PHIs while keeping the | ||||||||
| 1604 | // loop in the canonical form where each predecessor of each exit block should | ||||||||
| 1605 | // be contained within the loop. For example, this will convert the loop below | ||||||||
| 1606 | // from | ||||||||
| 1607 | // | ||||||||
| 1608 | // LB1: | ||||||||
| 1609 | // %v1 = | ||||||||
| 1610 | // br %LE, %LB2 | ||||||||
| 1611 | // LB2: | ||||||||
| 1612 | // %v2 = | ||||||||
| 1613 | // br %LE, %LB1 | ||||||||
| 1614 | // LE: | ||||||||
| 1615 | // %p = phi [%v1, %LB1], [%v2, %LB2] <-- non-trivially replaceable | ||||||||
| 1616 | // | ||||||||
| 1617 | // to | ||||||||
| 1618 | // | ||||||||
| 1619 | // LB1: | ||||||||
| 1620 | // %v1 = | ||||||||
| 1621 | // br %LE.split, %LB2 | ||||||||
| 1622 | // LB2: | ||||||||
| 1623 | // %v2 = | ||||||||
| 1624 | // br %LE.split2, %LB1 | ||||||||
| 1625 | // LE.split: | ||||||||
| 1626 | // %p1 = phi [%v1, %LB1] <-- trivially replaceable | ||||||||
| 1627 | // br %LE | ||||||||
| 1628 | // LE.split2: | ||||||||
| 1629 | // %p2 = phi [%v2, %LB2] <-- trivially replaceable | ||||||||
| 1630 | // br %LE | ||||||||
| 1631 | // LE: | ||||||||
| 1632 | // %p = phi [%p1, %LE.split], [%p2, %LE.split2] | ||||||||
| 1633 | // | ||||||||
| 1634 | const auto &BlockColors = SafetyInfo->getBlockColors(); | ||||||||
| 1635 | SmallSetVector<BasicBlock *, 8> PredBBs(pred_begin(ExitBB), pred_end(ExitBB)); | ||||||||
| 1636 | while (!PredBBs.empty()) { | ||||||||
| 1637 | BasicBlock *PredBB = *PredBBs.begin(); | ||||||||
| 1638 | assert(CurLoop->contains(PredBB) &&((CurLoop->contains(PredBB) && "Expect all predecessors are in the loop" ) ? static_cast<void> (0) : __assert_fail ("CurLoop->contains(PredBB) && \"Expect all predecessors are in the loop\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1639, __PRETTY_FUNCTION__)) | ||||||||
| 1639 | "Expect all predecessors are in the loop")((CurLoop->contains(PredBB) && "Expect all predecessors are in the loop" ) ? static_cast<void> (0) : __assert_fail ("CurLoop->contains(PredBB) && \"Expect all predecessors are in the loop\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1639, __PRETTY_FUNCTION__)); | ||||||||
| 1640 | if (PN->getBasicBlockIndex(PredBB) >= 0) { | ||||||||
| 1641 | BasicBlock *NewPred = SplitBlockPredecessors( | ||||||||
| 1642 | ExitBB, PredBB, ".split.loop.exit", DT, LI, MSSAU, true); | ||||||||
| 1643 | // Since we do not allow splitting EH-block with BlockColors in | ||||||||
| 1644 | // canSplitPredecessors(), we can simply assign predecessor's color to | ||||||||
| 1645 | // the new block. | ||||||||
| 1646 | if (!BlockColors.empty()) | ||||||||
| 1647 | // Grab a reference to the ColorVector to be inserted before getting the | ||||||||
| 1648 | // reference to the vector we are copying because inserting the new | ||||||||
| 1649 | // element in BlockColors might cause the map to be reallocated. | ||||||||
| 1650 | SafetyInfo->copyColors(NewPred, PredBB); | ||||||||
| 1651 | } | ||||||||
| 1652 | PredBBs.remove(PredBB); | ||||||||
| 1653 | } | ||||||||
| 1654 | } | ||||||||
| 1655 | |||||||||
| 1656 | /// When an instruction is found to only be used outside of the loop, this | ||||||||
| 1657 | /// function moves it to the exit blocks and patches up SSA form as needed. | ||||||||
| 1658 | /// This method is guaranteed to remove the original instruction from its | ||||||||
| 1659 | /// position, and may either delete it or move it to outside of the loop. | ||||||||
| 1660 | /// | ||||||||
| 1661 | static bool sink(Instruction &I, LoopInfo *LI, DominatorTree *DT, | ||||||||
| 1662 | BlockFrequencyInfo *BFI, const Loop *CurLoop, | ||||||||
| 1663 | ICFLoopSafetyInfo *SafetyInfo, MemorySSAUpdater *MSSAU, | ||||||||
| 1664 | OptimizationRemarkEmitter *ORE) { | ||||||||
| 1665 | bool Changed = false; | ||||||||
| 1666 | LLVM_DEBUG(dbgs() << "LICM sinking instruction: " << I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM sinking instruction: " << I << "\n"; } } while (false); | ||||||||
| 1667 | |||||||||
| 1668 | // Iterate over users to be ready for actual sinking. Replace users via | ||||||||
| 1669 | // unreachable blocks with undef and make all user PHIs trivially replaceable. | ||||||||
| 1670 | SmallPtrSet<Instruction *, 8> VisitedUsers; | ||||||||
| 1671 | for (Value::user_iterator UI = I.user_begin(), UE = I.user_end(); UI != UE;) { | ||||||||
| 1672 | auto *User = cast<Instruction>(*UI); | ||||||||
| 1673 | Use &U = UI.getUse(); | ||||||||
| 1674 | ++UI; | ||||||||
| 1675 | |||||||||
| 1676 | if (VisitedUsers.count(User) || CurLoop->contains(User)) | ||||||||
| 1677 | continue; | ||||||||
| 1678 | |||||||||
| 1679 | if (!DT->isReachableFromEntry(User->getParent())) { | ||||||||
| 1680 | U = UndefValue::get(I.getType()); | ||||||||
| 1681 | Changed = true; | ||||||||
| 1682 | continue; | ||||||||
| 1683 | } | ||||||||
| 1684 | |||||||||
| 1685 | // The user must be a PHI node. | ||||||||
| 1686 | PHINode *PN = cast<PHINode>(User); | ||||||||
| 1687 | |||||||||
| 1688 | // Surprisingly, instructions can be used outside of loops without any | ||||||||
| 1689 | // exits. This can only happen in PHI nodes if the incoming block is | ||||||||
| 1690 | // unreachable. | ||||||||
| 1691 | BasicBlock *BB = PN->getIncomingBlock(U); | ||||||||
| 1692 | if (!DT->isReachableFromEntry(BB)) { | ||||||||
| 1693 | U = UndefValue::get(I.getType()); | ||||||||
| 1694 | Changed = true; | ||||||||
| 1695 | continue; | ||||||||
| 1696 | } | ||||||||
| 1697 | |||||||||
| 1698 | VisitedUsers.insert(PN); | ||||||||
| 1699 | if (isTriviallyReplaceablePHI(*PN, I)) | ||||||||
| 1700 | continue; | ||||||||
| 1701 | |||||||||
| 1702 | if (!canSplitPredecessors(PN, SafetyInfo)) | ||||||||
| 1703 | return Changed; | ||||||||
| 1704 | |||||||||
| 1705 | // Split predecessors of the PHI so that we can make users trivially | ||||||||
| 1706 | // replaceable. | ||||||||
| 1707 | splitPredecessorsOfLoopExit(PN, DT, LI, CurLoop, SafetyInfo, MSSAU); | ||||||||
| 1708 | |||||||||
| 1709 | // Should rebuild the iterators, as they may be invalidated by | ||||||||
| 1710 | // splitPredecessorsOfLoopExit(). | ||||||||
| 1711 | UI = I.user_begin(); | ||||||||
| 1712 | UE = I.user_end(); | ||||||||
| 1713 | } | ||||||||
| 1714 | |||||||||
| 1715 | if (VisitedUsers.empty()) | ||||||||
| 1716 | return Changed; | ||||||||
| 1717 | |||||||||
| 1718 | ORE->emit([&]() { | ||||||||
| 1719 | return OptimizationRemark(DEBUG_TYPE"licm", "InstSunk", &I) | ||||||||
| 1720 | << "sinking " << ore::NV("Inst", &I); | ||||||||
| 1721 | }); | ||||||||
| 1722 | if (isa<LoadInst>(I)) | ||||||||
| 1723 | ++NumMovedLoads; | ||||||||
| 1724 | else if (isa<CallInst>(I)) | ||||||||
| 1725 | ++NumMovedCalls; | ||||||||
| 1726 | ++NumSunk; | ||||||||
| 1727 | |||||||||
| 1728 | #ifndef NDEBUG | ||||||||
| 1729 | SmallVector<BasicBlock *, 32> ExitBlocks; | ||||||||
| 1730 | CurLoop->getUniqueExitBlocks(ExitBlocks); | ||||||||
| 1731 | SmallPtrSet<BasicBlock *, 32> ExitBlockSet(ExitBlocks.begin(), | ||||||||
| 1732 | ExitBlocks.end()); | ||||||||
| 1733 | #endif | ||||||||
| 1734 | |||||||||
| 1735 | // Clones of this instruction. Don't create more than one per exit block! | ||||||||
| 1736 | SmallDenseMap<BasicBlock *, Instruction *, 32> SunkCopies; | ||||||||
| 1737 | |||||||||
| 1738 | // If this instruction is only used outside of the loop, then all users are | ||||||||
| 1739 | // PHI nodes in exit blocks due to LCSSA form. Just RAUW them with clones of | ||||||||
| 1740 | // the instruction. | ||||||||
| 1741 | // First check if I is worth sinking for all uses. Sink only when it is worth | ||||||||
| 1742 | // across all uses. | ||||||||
| 1743 | SmallSetVector<User*, 8> Users(I.user_begin(), I.user_end()); | ||||||||
| 1744 | SmallVector<PHINode *, 8> ExitPNs; | ||||||||
| 1745 | for (auto *UI : Users) { | ||||||||
| 1746 | auto *User = cast<Instruction>(UI); | ||||||||
| 1747 | |||||||||
| 1748 | if (CurLoop->contains(User)) | ||||||||
| 1749 | continue; | ||||||||
| 1750 | |||||||||
| 1751 | PHINode *PN = cast<PHINode>(User); | ||||||||
| 1752 | assert(ExitBlockSet.count(PN->getParent()) &&((ExitBlockSet.count(PN->getParent()) && "The LCSSA PHI is not in an exit block!" ) ? static_cast<void> (0) : __assert_fail ("ExitBlockSet.count(PN->getParent()) && \"The LCSSA PHI is not in an exit block!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1753, __PRETTY_FUNCTION__)) | ||||||||
| 1753 | "The LCSSA PHI is not in an exit block!")((ExitBlockSet.count(PN->getParent()) && "The LCSSA PHI is not in an exit block!" ) ? static_cast<void> (0) : __assert_fail ("ExitBlockSet.count(PN->getParent()) && \"The LCSSA PHI is not in an exit block!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1753, __PRETTY_FUNCTION__)); | ||||||||
| 1754 | if (!worthSinkOrHoistInst(I, PN->getParent(), ORE, BFI)) { | ||||||||
| 1755 | return Changed; | ||||||||
| 1756 | } | ||||||||
| 1757 | |||||||||
| 1758 | ExitPNs.push_back(PN); | ||||||||
| 1759 | } | ||||||||
| 1760 | |||||||||
| 1761 | for (auto *PN : ExitPNs) { | ||||||||
| 1762 | |||||||||
| 1763 | // The PHI must be trivially replaceable. | ||||||||
| 1764 | Instruction *New = sinkThroughTriviallyReplaceablePHI( | ||||||||
| 1765 | PN, &I, LI, SunkCopies, SafetyInfo, CurLoop, MSSAU); | ||||||||
| 1766 | PN->replaceAllUsesWith(New); | ||||||||
| 1767 | eraseInstruction(*PN, *SafetyInfo, nullptr, nullptr); | ||||||||
| 1768 | Changed = true; | ||||||||
| 1769 | } | ||||||||
| 1770 | return Changed; | ||||||||
| 1771 | } | ||||||||
| 1772 | |||||||||
| 1773 | /// When an instruction is found to only use loop invariant operands that | ||||||||
| 1774 | /// is safe to hoist, this instruction is called to do the dirty work. | ||||||||
| 1775 | /// | ||||||||
| 1776 | static void hoist(Instruction &I, const DominatorTree *DT, const Loop *CurLoop, | ||||||||
| 1777 | BasicBlock *Dest, ICFLoopSafetyInfo *SafetyInfo, | ||||||||
| 1778 | MemorySSAUpdater *MSSAU, ScalarEvolution *SE, | ||||||||
| 1779 | OptimizationRemarkEmitter *ORE) { | ||||||||
| 1780 | LLVM_DEBUG(dbgs() << "LICM hoisting to " << Dest->getNameOrAsOperand() << ": "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM hoisting to " << Dest ->getNameOrAsOperand() << ": " << I << "\n" ; } } while (false) | ||||||||
| 1781 | << I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM hoisting to " << Dest ->getNameOrAsOperand() << ": " << I << "\n" ; } } while (false); | ||||||||
| 1782 | ORE->emit([&]() { | ||||||||
| 1783 | return OptimizationRemark(DEBUG_TYPE"licm", "Hoisted", &I) << "hoisting " | ||||||||
| 1784 | << ore::NV("Inst", &I); | ||||||||
| 1785 | }); | ||||||||
| 1786 | |||||||||
| 1787 | // Metadata can be dependent on conditions we are hoisting above. | ||||||||
| 1788 | // Conservatively strip all metadata on the instruction unless we were | ||||||||
| 1789 | // guaranteed to execute I if we entered the loop, in which case the metadata | ||||||||
| 1790 | // is valid in the loop preheader. | ||||||||
| 1791 | if (I.hasMetadataOtherThanDebugLoc() && | ||||||||
| 1792 | // The check on hasMetadataOtherThanDebugLoc is to prevent us from burning | ||||||||
| 1793 | // time in isGuaranteedToExecute if we don't actually have anything to | ||||||||
| 1794 | // drop. It is a compile time optimization, not required for correctness. | ||||||||
| 1795 | !SafetyInfo->isGuaranteedToExecute(I, DT, CurLoop)) | ||||||||
| 1796 | I.dropUnknownNonDebugMetadata(); | ||||||||
| 1797 | |||||||||
| 1798 | if (isa<PHINode>(I)) | ||||||||
| 1799 | // Move the new node to the end of the phi list in the destination block. | ||||||||
| 1800 | moveInstructionBefore(I, *Dest->getFirstNonPHI(), *SafetyInfo, MSSAU, SE); | ||||||||
| 1801 | else | ||||||||
| 1802 | // Move the new node to the destination block, before its terminator. | ||||||||
| 1803 | moveInstructionBefore(I, *Dest->getTerminator(), *SafetyInfo, MSSAU, SE); | ||||||||
| 1804 | |||||||||
| 1805 | I.updateLocationAfterHoist(); | ||||||||
| 1806 | |||||||||
| 1807 | if (isa<LoadInst>(I)) | ||||||||
| 1808 | ++NumMovedLoads; | ||||||||
| 1809 | else if (isa<CallInst>(I)) | ||||||||
| 1810 | ++NumMovedCalls; | ||||||||
| 1811 | ++NumHoisted; | ||||||||
| 1812 | } | ||||||||
| 1813 | |||||||||
| 1814 | /// Only sink or hoist an instruction if it is not a trapping instruction, | ||||||||
| 1815 | /// or if the instruction is known not to trap when moved to the preheader. | ||||||||
| 1816 | /// or if it is a trapping instruction and is guaranteed to execute. | ||||||||
| 1817 | static bool isSafeToExecuteUnconditionally(Instruction &Inst, | ||||||||
| 1818 | const DominatorTree *DT, | ||||||||
| 1819 | const TargetLibraryInfo *TLI, | ||||||||
| 1820 | const Loop *CurLoop, | ||||||||
| 1821 | const LoopSafetyInfo *SafetyInfo, | ||||||||
| 1822 | OptimizationRemarkEmitter *ORE, | ||||||||
| 1823 | const Instruction *CtxI) { | ||||||||
| 1824 | if (isSafeToSpeculativelyExecute(&Inst, CtxI, DT, TLI)) | ||||||||
| 1825 | return true; | ||||||||
| 1826 | |||||||||
| 1827 | bool GuaranteedToExecute = | ||||||||
| 1828 | SafetyInfo->isGuaranteedToExecute(Inst, DT, CurLoop); | ||||||||
| 1829 | |||||||||
| 1830 | if (!GuaranteedToExecute) { | ||||||||
| 1831 | auto *LI = dyn_cast<LoadInst>(&Inst); | ||||||||
| 1832 | if (LI && CurLoop->isLoopInvariant(LI->getPointerOperand())) | ||||||||
| 1833 | ORE->emit([&]() { | ||||||||
| 1834 | return OptimizationRemarkMissed( | ||||||||
| 1835 | DEBUG_TYPE"licm", "LoadWithLoopInvariantAddressCondExecuted", LI) | ||||||||
| 1836 | << "failed to hoist load with loop-invariant address " | ||||||||
| 1837 | "because load is conditionally executed"; | ||||||||
| 1838 | }); | ||||||||
| 1839 | } | ||||||||
| 1840 | |||||||||
| 1841 | return GuaranteedToExecute; | ||||||||
| 1842 | } | ||||||||
| 1843 | |||||||||
| 1844 | namespace { | ||||||||
| 1845 | class LoopPromoter : public LoadAndStorePromoter { | ||||||||
| 1846 | Value *SomePtr; // Designated pointer to store to. | ||||||||
| 1847 | const SmallSetVector<Value *, 8> &PointerMustAliases; | ||||||||
| 1848 | SmallVectorImpl<BasicBlock *> &LoopExitBlocks; | ||||||||
| 1849 | SmallVectorImpl<Instruction *> &LoopInsertPts; | ||||||||
| 1850 | SmallVectorImpl<MemoryAccess *> &MSSAInsertPts; | ||||||||
| 1851 | PredIteratorCache &PredCache; | ||||||||
| 1852 | AliasSetTracker *AST; | ||||||||
| 1853 | MemorySSAUpdater *MSSAU; | ||||||||
| 1854 | LoopInfo &LI; | ||||||||
| 1855 | DebugLoc DL; | ||||||||
| 1856 | int Alignment; | ||||||||
| 1857 | bool UnorderedAtomic; | ||||||||
| 1858 | AAMDNodes AATags; | ||||||||
| 1859 | ICFLoopSafetyInfo &SafetyInfo; | ||||||||
| 1860 | |||||||||
| 1861 | // We're about to add a use of V in a loop exit block. Insert an LCSSA phi | ||||||||
| 1862 | // (if legal) if doing so would add an out-of-loop use to an instruction | ||||||||
| 1863 | // defined in-loop. | ||||||||
| 1864 | Value *maybeInsertLCSSAPHI(Value *V, BasicBlock *BB) const { | ||||||||
| 1865 | if (!LI.wouldBeOutOfLoopUseRequiringLCSSA(V, BB)) | ||||||||
| 1866 | return V; | ||||||||
| 1867 | |||||||||
| 1868 | Instruction *I = cast<Instruction>(V); | ||||||||
| 1869 | // We need to create an LCSSA PHI node for the incoming value and | ||||||||
| 1870 | // store that. | ||||||||
| 1871 | PHINode *PN = PHINode::Create(I->getType(), PredCache.size(BB), | ||||||||
| 1872 | I->getName() + ".lcssa", &BB->front()); | ||||||||
| 1873 | for (BasicBlock *Pred : PredCache.get(BB)) | ||||||||
| 1874 | PN->addIncoming(I, Pred); | ||||||||
| 1875 | return PN; | ||||||||
| 1876 | } | ||||||||
| 1877 | |||||||||
| 1878 | public: | ||||||||
| 1879 | LoopPromoter(Value *SP, ArrayRef<const Instruction *> Insts, SSAUpdater &S, | ||||||||
| 1880 | const SmallSetVector<Value *, 8> &PMA, | ||||||||
| 1881 | SmallVectorImpl<BasicBlock *> &LEB, | ||||||||
| 1882 | SmallVectorImpl<Instruction *> &LIP, | ||||||||
| 1883 | SmallVectorImpl<MemoryAccess *> &MSSAIP, PredIteratorCache &PIC, | ||||||||
| 1884 | AliasSetTracker *ast, MemorySSAUpdater *MSSAU, LoopInfo &li, | ||||||||
| 1885 | DebugLoc dl, int alignment, bool UnorderedAtomic, | ||||||||
| 1886 | const AAMDNodes &AATags, ICFLoopSafetyInfo &SafetyInfo) | ||||||||
| 1887 | : LoadAndStorePromoter(Insts, S), SomePtr(SP), PointerMustAliases(PMA), | ||||||||
| 1888 | LoopExitBlocks(LEB), LoopInsertPts(LIP), MSSAInsertPts(MSSAIP), | ||||||||
| 1889 | PredCache(PIC), AST(ast), MSSAU(MSSAU), LI(li), DL(std::move(dl)), | ||||||||
| 1890 | Alignment(alignment), UnorderedAtomic(UnorderedAtomic), AATags(AATags), | ||||||||
| 1891 | SafetyInfo(SafetyInfo) {} | ||||||||
| 1892 | |||||||||
| 1893 | bool isInstInList(Instruction *I, | ||||||||
| 1894 | const SmallVectorImpl<Instruction *> &) const override { | ||||||||
| 1895 | Value *Ptr; | ||||||||
| 1896 | if (LoadInst *LI = dyn_cast<LoadInst>(I)) | ||||||||
| 1897 | Ptr = LI->getOperand(0); | ||||||||
| 1898 | else | ||||||||
| 1899 | Ptr = cast<StoreInst>(I)->getPointerOperand(); | ||||||||
| 1900 | return PointerMustAliases.count(Ptr); | ||||||||
| 1901 | } | ||||||||
| 1902 | |||||||||
| 1903 | void doExtraRewritesBeforeFinalDeletion() override { | ||||||||
| 1904 | // Insert stores after in the loop exit blocks. Each exit block gets a | ||||||||
| 1905 | // store of the live-out values that feed them. Since we've already told | ||||||||
| 1906 | // the SSA updater about the defs in the loop and the preheader | ||||||||
| 1907 | // definition, it is all set and we can start using it. | ||||||||
| 1908 | for (unsigned i = 0, e = LoopExitBlocks.size(); i != e; ++i) { | ||||||||
| 1909 | BasicBlock *ExitBlock = LoopExitBlocks[i]; | ||||||||
| 1910 | Value *LiveInValue = SSA.GetValueInMiddleOfBlock(ExitBlock); | ||||||||
| 1911 | LiveInValue = maybeInsertLCSSAPHI(LiveInValue, ExitBlock); | ||||||||
| 1912 | Value *Ptr = maybeInsertLCSSAPHI(SomePtr, ExitBlock); | ||||||||
| 1913 | Instruction *InsertPos = LoopInsertPts[i]; | ||||||||
| 1914 | StoreInst *NewSI = new StoreInst(LiveInValue, Ptr, InsertPos); | ||||||||
| 1915 | if (UnorderedAtomic) | ||||||||
| 1916 | NewSI->setOrdering(AtomicOrdering::Unordered); | ||||||||
| 1917 | NewSI->setAlignment(Align(Alignment)); | ||||||||
| 1918 | NewSI->setDebugLoc(DL); | ||||||||
| 1919 | if (AATags) | ||||||||
| 1920 | NewSI->setAAMetadata(AATags); | ||||||||
| 1921 | |||||||||
| 1922 | if (MSSAU) { | ||||||||
| 1923 | MemoryAccess *MSSAInsertPoint = MSSAInsertPts[i]; | ||||||||
| 1924 | MemoryAccess *NewMemAcc; | ||||||||
| 1925 | if (!MSSAInsertPoint) { | ||||||||
| 1926 | NewMemAcc = MSSAU->createMemoryAccessInBB( | ||||||||
| 1927 | NewSI, nullptr, NewSI->getParent(), MemorySSA::Beginning); | ||||||||
| 1928 | } else { | ||||||||
| 1929 | NewMemAcc = | ||||||||
| 1930 | MSSAU->createMemoryAccessAfter(NewSI, nullptr, MSSAInsertPoint); | ||||||||
| 1931 | } | ||||||||
| 1932 | MSSAInsertPts[i] = NewMemAcc; | ||||||||
| 1933 | MSSAU->insertDef(cast<MemoryDef>(NewMemAcc), true); | ||||||||
| 1934 | // FIXME: true for safety, false may still be correct. | ||||||||
| 1935 | } | ||||||||
| 1936 | } | ||||||||
| 1937 | } | ||||||||
| 1938 | |||||||||
| 1939 | void replaceLoadWithValue(LoadInst *LI, Value *V) const override { | ||||||||
| 1940 | // Update alias analysis. | ||||||||
| 1941 | if (AST) | ||||||||
| 1942 | AST->copyValue(LI, V); | ||||||||
| 1943 | } | ||||||||
| 1944 | void instructionDeleted(Instruction *I) const override { | ||||||||
| 1945 | SafetyInfo.removeInstruction(I); | ||||||||
| 1946 | if (AST) | ||||||||
| 1947 | AST->deleteValue(I); | ||||||||
| 1948 | if (MSSAU) | ||||||||
| 1949 | MSSAU->removeMemoryAccess(I); | ||||||||
| 1950 | } | ||||||||
| 1951 | }; | ||||||||
| 1952 | |||||||||
| 1953 | |||||||||
| 1954 | /// Return true iff we can prove that a caller of this function can not inspect | ||||||||
| 1955 | /// the contents of the provided object in a well defined program. | ||||||||
| 1956 | bool isKnownNonEscaping(Value *Object, const TargetLibraryInfo *TLI) { | ||||||||
| 1957 | if (isa<AllocaInst>(Object)) | ||||||||
| 1958 | // Since the alloca goes out of scope, we know the caller can't retain a | ||||||||
| 1959 | // reference to it and be well defined. Thus, we don't need to check for | ||||||||
| 1960 | // capture. | ||||||||
| 1961 | return true; | ||||||||
| 1962 | |||||||||
| 1963 | // For all other objects we need to know that the caller can't possibly | ||||||||
| 1964 | // have gotten a reference to the object. There are two components of | ||||||||
| 1965 | // that: | ||||||||
| 1966 | // 1) Object can't be escaped by this function. This is what | ||||||||
| 1967 | // PointerMayBeCaptured checks. | ||||||||
| 1968 | // 2) Object can't have been captured at definition site. For this, we | ||||||||
| 1969 | // need to know the return value is noalias. At the moment, we use a | ||||||||
| 1970 | // weaker condition and handle only AllocLikeFunctions (which are | ||||||||
| 1971 | // known to be noalias). TODO | ||||||||
| 1972 | return isAllocLikeFn(Object, TLI) && | ||||||||
| 1973 | !PointerMayBeCaptured(Object, true, true); | ||||||||
| 1974 | } | ||||||||
| 1975 | |||||||||
| 1976 | } // namespace | ||||||||
| 1977 | |||||||||
| 1978 | /// Try to promote memory values to scalars by sinking stores out of the | ||||||||
| 1979 | /// loop and moving loads to before the loop. We do this by looping over | ||||||||
| 1980 | /// the stores in the loop, looking for stores to Must pointers which are | ||||||||
| 1981 | /// loop invariant. | ||||||||
| 1982 | /// | ||||||||
| 1983 | bool llvm::promoteLoopAccessesToScalars( | ||||||||
| 1984 | const SmallSetVector<Value *, 8> &PointerMustAliases, | ||||||||
| 1985 | SmallVectorImpl<BasicBlock *> &ExitBlocks, | ||||||||
| 1986 | SmallVectorImpl<Instruction *> &InsertPts, | ||||||||
| 1987 | SmallVectorImpl<MemoryAccess *> &MSSAInsertPts, PredIteratorCache &PIC, | ||||||||
| 1988 | LoopInfo *LI, DominatorTree *DT, const TargetLibraryInfo *TLI, | ||||||||
| 1989 | Loop *CurLoop, AliasSetTracker *CurAST, MemorySSAUpdater *MSSAU, | ||||||||
| 1990 | ICFLoopSafetyInfo *SafetyInfo, OptimizationRemarkEmitter *ORE) { | ||||||||
| 1991 | // Verify inputs. | ||||||||
| 1992 | assert(LI != nullptr && DT != nullptr && CurLoop != nullptr &&((LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected Input to promoteLoopAccessesToScalars" ) ? static_cast<void> (0) : __assert_fail ("LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected Input to promoteLoopAccessesToScalars\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1994, __PRETTY_FUNCTION__)) | ||||||||
| 1993 | SafetyInfo != nullptr &&((LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected Input to promoteLoopAccessesToScalars" ) ? static_cast<void> (0) : __assert_fail ("LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected Input to promoteLoopAccessesToScalars\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1994, __PRETTY_FUNCTION__)) | ||||||||
| 1994 | "Unexpected Input to promoteLoopAccessesToScalars")((LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && "Unexpected Input to promoteLoopAccessesToScalars" ) ? static_cast<void> (0) : __assert_fail ("LI != nullptr && DT != nullptr && CurLoop != nullptr && SafetyInfo != nullptr && \"Unexpected Input to promoteLoopAccessesToScalars\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 1994, __PRETTY_FUNCTION__)); | ||||||||
| 1995 | |||||||||
| 1996 | Value *SomePtr = *PointerMustAliases.begin(); | ||||||||
| 1997 | BasicBlock *Preheader = CurLoop->getLoopPreheader(); | ||||||||
| 1998 | |||||||||
| 1999 | // It is not safe to promote a load/store from the loop if the load/store is | ||||||||
| 2000 | // conditional. For example, turning: | ||||||||
| 2001 | // | ||||||||
| 2002 | // for () { if (c) *P += 1; } | ||||||||
| 2003 | // | ||||||||
| 2004 | // into: | ||||||||
| 2005 | // | ||||||||
| 2006 | // tmp = *P; for () { if (c) tmp +=1; } *P = tmp; | ||||||||
| 2007 | // | ||||||||
| 2008 | // is not safe, because *P may only be valid to access if 'c' is true. | ||||||||
| 2009 | // | ||||||||
| 2010 | // The safety property divides into two parts: | ||||||||
| 2011 | // p1) The memory may not be dereferenceable on entry to the loop. In this | ||||||||
| 2012 | // case, we can't insert the required load in the preheader. | ||||||||
| 2013 | // p2) The memory model does not allow us to insert a store along any dynamic | ||||||||
| 2014 | // path which did not originally have one. | ||||||||
| 2015 | // | ||||||||
| 2016 | // If at least one store is guaranteed to execute, both properties are | ||||||||
| 2017 | // satisfied, and promotion is legal. | ||||||||
| 2018 | // | ||||||||
| 2019 | // This, however, is not a necessary condition. Even if no store/load is | ||||||||
| 2020 | // guaranteed to execute, we can still establish these properties. | ||||||||
| 2021 | // We can establish (p1) by proving that hoisting the load into the preheader | ||||||||
| 2022 | // is safe (i.e. proving dereferenceability on all paths through the loop). We | ||||||||
| 2023 | // can use any access within the alias set to prove dereferenceability, | ||||||||
| 2024 | // since they're all must alias. | ||||||||
| 2025 | // | ||||||||
| 2026 | // There are two ways establish (p2): | ||||||||
| 2027 | // a) Prove the location is thread-local. In this case the memory model | ||||||||
| 2028 | // requirement does not apply, and stores are safe to insert. | ||||||||
| 2029 | // b) Prove a store dominates every exit block. In this case, if an exit | ||||||||
| 2030 | // blocks is reached, the original dynamic path would have taken us through | ||||||||
| 2031 | // the store, so inserting a store into the exit block is safe. Note that this | ||||||||
| 2032 | // is different from the store being guaranteed to execute. For instance, | ||||||||
| 2033 | // if an exception is thrown on the first iteration of the loop, the original | ||||||||
| 2034 | // store is never executed, but the exit blocks are not executed either. | ||||||||
| 2035 | |||||||||
| 2036 | bool DereferenceableInPH = false; | ||||||||
| 2037 | bool SafeToInsertStore = false; | ||||||||
| 2038 | |||||||||
| 2039 | SmallVector<Instruction *, 64> LoopUses; | ||||||||
| 2040 | |||||||||
| 2041 | // We start with an alignment of one and try to find instructions that allow | ||||||||
| 2042 | // us to prove better alignment. | ||||||||
| 2043 | Align Alignment; | ||||||||
| 2044 | // Keep track of which types of access we see | ||||||||
| 2045 | bool SawUnorderedAtomic = false; | ||||||||
| 2046 | bool SawNotAtomic = false; | ||||||||
| 2047 | AAMDNodes AATags; | ||||||||
| 2048 | |||||||||
| 2049 | const DataLayout &MDL = Preheader->getModule()->getDataLayout(); | ||||||||
| 2050 | |||||||||
| 2051 | bool IsKnownThreadLocalObject = false; | ||||||||
| 2052 | if (SafetyInfo->anyBlockMayThrow()) { | ||||||||
| 2053 | // If a loop can throw, we have to insert a store along each unwind edge. | ||||||||
| 2054 | // That said, we can't actually make the unwind edge explicit. Therefore, | ||||||||
| 2055 | // we have to prove that the store is dead along the unwind edge. We do | ||||||||
| 2056 | // this by proving that the caller can't have a reference to the object | ||||||||
| 2057 | // after return and thus can't possibly load from the object. | ||||||||
| 2058 | Value *Object = getUnderlyingObject(SomePtr); | ||||||||
| 2059 | if (!isKnownNonEscaping(Object, TLI)) | ||||||||
| 2060 | return false; | ||||||||
| 2061 | // Subtlety: Alloca's aren't visible to callers, but *are* potentially | ||||||||
| 2062 | // visible to other threads if captured and used during their lifetimes. | ||||||||
| 2063 | IsKnownThreadLocalObject = !isa<AllocaInst>(Object); | ||||||||
| 2064 | } | ||||||||
| 2065 | |||||||||
| 2066 | // Check that all of the pointers in the alias set have the same type. We | ||||||||
| 2067 | // cannot (yet) promote a memory location that is loaded and stored in | ||||||||
| 2068 | // different sizes. While we are at it, collect alignment and AA info. | ||||||||
| 2069 | for (Value *ASIV : PointerMustAliases) { | ||||||||
| 2070 | // Check that all of the pointers in the alias set have the same type. We | ||||||||
| 2071 | // cannot (yet) promote a memory location that is loaded and stored in | ||||||||
| 2072 | // different sizes. | ||||||||
| 2073 | if (SomePtr->getType() != ASIV->getType()) | ||||||||
| 2074 | return false; | ||||||||
| 2075 | |||||||||
| 2076 | for (User *U : ASIV->users()) { | ||||||||
| 2077 | // Ignore instructions that are outside the loop. | ||||||||
| 2078 | Instruction *UI = dyn_cast<Instruction>(U); | ||||||||
| 2079 | if (!UI || !CurLoop->contains(UI)) | ||||||||
| 2080 | continue; | ||||||||
| 2081 | |||||||||
| 2082 | // If there is an non-load/store instruction in the loop, we can't promote | ||||||||
| 2083 | // it. | ||||||||
| 2084 | if (LoadInst *Load = dyn_cast<LoadInst>(UI)) { | ||||||||
| 2085 | if (!Load->isUnordered()) | ||||||||
| 2086 | return false; | ||||||||
| 2087 | |||||||||
| 2088 | SawUnorderedAtomic |= Load->isAtomic(); | ||||||||
| 2089 | SawNotAtomic |= !Load->isAtomic(); | ||||||||
| 2090 | |||||||||
| 2091 | Align InstAlignment = Load->getAlign(); | ||||||||
| 2092 | |||||||||
| 2093 | // Note that proving a load safe to speculate requires proving | ||||||||
| 2094 | // sufficient alignment at the target location. Proving it guaranteed | ||||||||
| 2095 | // to execute does as well. Thus we can increase our guaranteed | ||||||||
| 2096 | // alignment as well. | ||||||||
| 2097 | if (!DereferenceableInPH || (InstAlignment > Alignment)) | ||||||||
| 2098 | if (isSafeToExecuteUnconditionally(*Load, DT, TLI, CurLoop, | ||||||||
| 2099 | SafetyInfo, ORE, | ||||||||
| 2100 | Preheader->getTerminator())) { | ||||||||
| 2101 | DereferenceableInPH = true; | ||||||||
| 2102 | Alignment = std::max(Alignment, InstAlignment); | ||||||||
| 2103 | } | ||||||||
| 2104 | } else if (const StoreInst *Store = dyn_cast<StoreInst>(UI)) { | ||||||||
| 2105 | // Stores *of* the pointer are not interesting, only stores *to* the | ||||||||
| 2106 | // pointer. | ||||||||
| 2107 | if (UI->getOperand(1) != ASIV) | ||||||||
| 2108 | continue; | ||||||||
| 2109 | if (!Store->isUnordered()) | ||||||||
| 2110 | return false; | ||||||||
| 2111 | |||||||||
| 2112 | SawUnorderedAtomic |= Store->isAtomic(); | ||||||||
| 2113 | SawNotAtomic |= !Store->isAtomic(); | ||||||||
| 2114 | |||||||||
| 2115 | // If the store is guaranteed to execute, both properties are satisfied. | ||||||||
| 2116 | // We may want to check if a store is guaranteed to execute even if we | ||||||||
| 2117 | // already know that promotion is safe, since it may have higher | ||||||||
| 2118 | // alignment than any other guaranteed stores, in which case we can | ||||||||
| 2119 | // raise the alignment on the promoted store. | ||||||||
| 2120 | Align InstAlignment = Store->getAlign(); | ||||||||
| 2121 | |||||||||
| 2122 | if (!DereferenceableInPH || !SafeToInsertStore || | ||||||||
| 2123 | (InstAlignment > Alignment)) { | ||||||||
| 2124 | if (SafetyInfo->isGuaranteedToExecute(*UI, DT, CurLoop)) { | ||||||||
| 2125 | DereferenceableInPH = true; | ||||||||
| 2126 | SafeToInsertStore = true; | ||||||||
| 2127 | Alignment = std::max(Alignment, InstAlignment); | ||||||||
| 2128 | } | ||||||||
| 2129 | } | ||||||||
| 2130 | |||||||||
| 2131 | // If a store dominates all exit blocks, it is safe to sink. | ||||||||
| 2132 | // As explained above, if an exit block was executed, a dominating | ||||||||
| 2133 | // store must have been executed at least once, so we are not | ||||||||
| 2134 | // introducing stores on paths that did not have them. | ||||||||
| 2135 | // Note that this only looks at explicit exit blocks. If we ever | ||||||||
| 2136 | // start sinking stores into unwind edges (see above), this will break. | ||||||||
| 2137 | if (!SafeToInsertStore) | ||||||||
| 2138 | SafeToInsertStore = llvm::all_of(ExitBlocks, [&](BasicBlock *Exit) { | ||||||||
| 2139 | return DT->dominates(Store->getParent(), Exit); | ||||||||
| 2140 | }); | ||||||||
| 2141 | |||||||||
| 2142 | // If the store is not guaranteed to execute, we may still get | ||||||||
| 2143 | // deref info through it. | ||||||||
| 2144 | if (!DereferenceableInPH) { | ||||||||
| 2145 | DereferenceableInPH = isDereferenceableAndAlignedPointer( | ||||||||
| 2146 | Store->getPointerOperand(), Store->getValueOperand()->getType(), | ||||||||
| 2147 | Store->getAlign(), MDL, Preheader->getTerminator(), DT, TLI); | ||||||||
| 2148 | } | ||||||||
| 2149 | } else | ||||||||
| 2150 | return false; // Not a load or store. | ||||||||
| 2151 | |||||||||
| 2152 | // Merge the AA tags. | ||||||||
| 2153 | if (LoopUses.empty()) { | ||||||||
| 2154 | // On the first load/store, just take its AA tags. | ||||||||
| 2155 | UI->getAAMetadata(AATags); | ||||||||
| 2156 | } else if (AATags) { | ||||||||
| 2157 | UI->getAAMetadata(AATags, /* Merge = */ true); | ||||||||
| 2158 | } | ||||||||
| 2159 | |||||||||
| 2160 | LoopUses.push_back(UI); | ||||||||
| 2161 | } | ||||||||
| 2162 | } | ||||||||
| 2163 | |||||||||
| 2164 | // If we found both an unordered atomic instruction and a non-atomic memory | ||||||||
| 2165 | // access, bail. We can't blindly promote non-atomic to atomic since we | ||||||||
| 2166 | // might not be able to lower the result. We can't downgrade since that | ||||||||
| 2167 | // would violate memory model. Also, align 0 is an error for atomics. | ||||||||
| 2168 | if (SawUnorderedAtomic && SawNotAtomic) | ||||||||
| 2169 | return false; | ||||||||
| 2170 | |||||||||
| 2171 | // If we're inserting an atomic load in the preheader, we must be able to | ||||||||
| 2172 | // lower it. We're only guaranteed to be able to lower naturally aligned | ||||||||
| 2173 | // atomics. | ||||||||
| 2174 | auto *SomePtrElemType = SomePtr->getType()->getPointerElementType(); | ||||||||
| 2175 | if (SawUnorderedAtomic && | ||||||||
| 2176 | Alignment < MDL.getTypeStoreSize(SomePtrElemType)) | ||||||||
| 2177 | return false; | ||||||||
| 2178 | |||||||||
| 2179 | // If we couldn't prove we can hoist the load, bail. | ||||||||
| 2180 | if (!DereferenceableInPH) | ||||||||
| 2181 | return false; | ||||||||
| 2182 | |||||||||
| 2183 | // We know we can hoist the load, but don't have a guaranteed store. | ||||||||
| 2184 | // Check whether the location is thread-local. If it is, then we can insert | ||||||||
| 2185 | // stores along paths which originally didn't have them without violating the | ||||||||
| 2186 | // memory model. | ||||||||
| 2187 | if (!SafeToInsertStore) { | ||||||||
| 2188 | if (IsKnownThreadLocalObject) | ||||||||
| 2189 | SafeToInsertStore = true; | ||||||||
| 2190 | else { | ||||||||
| 2191 | Value *Object = getUnderlyingObject(SomePtr); | ||||||||
| 2192 | SafeToInsertStore = | ||||||||
| 2193 | (isAllocLikeFn(Object, TLI) || isa<AllocaInst>(Object)) && | ||||||||
| 2194 | !PointerMayBeCaptured(Object, true, true); | ||||||||
| 2195 | } | ||||||||
| 2196 | } | ||||||||
| 2197 | |||||||||
| 2198 | // If we've still failed to prove we can sink the store, give up. | ||||||||
| 2199 | if (!SafeToInsertStore) | ||||||||
| 2200 | return false; | ||||||||
| 2201 | |||||||||
| 2202 | // Otherwise, this is safe to promote, lets do it! | ||||||||
| 2203 | LLVM_DEBUG(dbgs() << "LICM: Promoting value stored to in loop: " << *SomePtrdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM: Promoting value stored to in loop: " << *SomePtr << '\n'; } } while (false) | ||||||||
| 2204 | << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "LICM: Promoting value stored to in loop: " << *SomePtr << '\n'; } } while (false); | ||||||||
| 2205 | ORE->emit([&]() { | ||||||||
| 2206 | return OptimizationRemark(DEBUG_TYPE"licm", "PromoteLoopAccessesToScalar", | ||||||||
| 2207 | LoopUses[0]) | ||||||||
| 2208 | << "Moving accesses to memory location out of the loop"; | ||||||||
| 2209 | }); | ||||||||
| 2210 | ++NumPromoted; | ||||||||
| 2211 | |||||||||
| 2212 | // Look at all the loop uses, and try to merge their locations. | ||||||||
| 2213 | std::vector<const DILocation *> LoopUsesLocs; | ||||||||
| 2214 | for (auto U : LoopUses) | ||||||||
| 2215 | LoopUsesLocs.push_back(U->getDebugLoc().get()); | ||||||||
| 2216 | auto DL = DebugLoc(DILocation::getMergedLocations(LoopUsesLocs)); | ||||||||
| 2217 | |||||||||
| 2218 | // We use the SSAUpdater interface to insert phi nodes as required. | ||||||||
| 2219 | SmallVector<PHINode *, 16> NewPHIs; | ||||||||
| 2220 | SSAUpdater SSA(&NewPHIs); | ||||||||
| 2221 | LoopPromoter Promoter(SomePtr, LoopUses, SSA, PointerMustAliases, ExitBlocks, | ||||||||
| 2222 | InsertPts, MSSAInsertPts, PIC, CurAST, MSSAU, *LI, DL, | ||||||||
| 2223 | Alignment.value(), SawUnorderedAtomic, AATags, | ||||||||
| 2224 | *SafetyInfo); | ||||||||
| 2225 | |||||||||
| 2226 | // Set up the preheader to have a definition of the value. It is the live-out | ||||||||
| 2227 | // value from the preheader that uses in the loop will use. | ||||||||
| 2228 | LoadInst *PreheaderLoad = new LoadInst( | ||||||||
| 2229 | SomePtr->getType()->getPointerElementType(), SomePtr, | ||||||||
| 2230 | SomePtr->getName() + ".promoted", Preheader->getTerminator()); | ||||||||
| 2231 | if (SawUnorderedAtomic) | ||||||||
| 2232 | PreheaderLoad->setOrdering(AtomicOrdering::Unordered); | ||||||||
| 2233 | PreheaderLoad->setAlignment(Alignment); | ||||||||
| 2234 | PreheaderLoad->setDebugLoc(DebugLoc()); | ||||||||
| 2235 | if (AATags) | ||||||||
| 2236 | PreheaderLoad->setAAMetadata(AATags); | ||||||||
| 2237 | SSA.AddAvailableValue(Preheader, PreheaderLoad); | ||||||||
| 2238 | |||||||||
| 2239 | if (MSSAU) { | ||||||||
| 2240 | MemoryAccess *PreheaderLoadMemoryAccess = MSSAU->createMemoryAccessInBB( | ||||||||
| 2241 | PreheaderLoad, nullptr, PreheaderLoad->getParent(), MemorySSA::End); | ||||||||
| 2242 | MemoryUse *NewMemUse = cast<MemoryUse>(PreheaderLoadMemoryAccess); | ||||||||
| 2243 | MSSAU->insertUse(NewMemUse, /*RenameUses=*/true); | ||||||||
| 2244 | } | ||||||||
| 2245 | |||||||||
| 2246 | if (MSSAU && VerifyMemorySSA) | ||||||||
| 2247 | MSSAU->getMemorySSA()->verifyMemorySSA(); | ||||||||
| 2248 | // Rewrite all the loads in the loop and remember all the definitions from | ||||||||
| 2249 | // stores in the loop. | ||||||||
| 2250 | Promoter.run(LoopUses); | ||||||||
| 2251 | |||||||||
| 2252 | if (MSSAU && VerifyMemorySSA) | ||||||||
| 2253 | MSSAU->getMemorySSA()->verifyMemorySSA(); | ||||||||
| 2254 | // If the SSAUpdater didn't use the load in the preheader, just zap it now. | ||||||||
| 2255 | if (PreheaderLoad->use_empty()) | ||||||||
| 2256 | eraseInstruction(*PreheaderLoad, *SafetyInfo, CurAST, MSSAU); | ||||||||
| 2257 | |||||||||
| 2258 | return true; | ||||||||
| 2259 | } | ||||||||
| 2260 | |||||||||
| 2261 | static void foreachMemoryAccess(MemorySSA *MSSA, Loop *L, | ||||||||
| 2262 | function_ref<void(Instruction *)> Fn) { | ||||||||
| 2263 | for (const BasicBlock *BB : L->blocks()) | ||||||||
| 2264 | if (const auto *Accesses = MSSA->getBlockAccesses(BB)) | ||||||||
| 2265 | for (const auto &Access : *Accesses) | ||||||||
| 2266 | if (const auto *MUD = dyn_cast<MemoryUseOrDef>(&Access)) | ||||||||
| 2267 | Fn(MUD->getMemoryInst()); | ||||||||
| 2268 | } | ||||||||
| 2269 | |||||||||
| 2270 | static SmallVector<SmallSetVector<Value *, 8>, 0> | ||||||||
| 2271 | collectPromotionCandidates(MemorySSA *MSSA, AliasAnalysis *AA, Loop *L, | ||||||||
| 2272 | SmallVectorImpl<Instruction *> &MaybePromotable) { | ||||||||
| 2273 | AliasSetTracker AST(*AA); | ||||||||
| 2274 | |||||||||
| 2275 | auto IsPotentiallyPromotable = [L](const Instruction *I) { | ||||||||
| 2276 | if (const auto *SI = dyn_cast<StoreInst>(I)) | ||||||||
| 2277 | return L->isLoopInvariant(SI->getPointerOperand()); | ||||||||
| 2278 | if (const auto *LI = dyn_cast<LoadInst>(I)) | ||||||||
| 2279 | return L->isLoopInvariant(LI->getPointerOperand()); | ||||||||
| 2280 | return false; | ||||||||
| 2281 | }; | ||||||||
| 2282 | |||||||||
| 2283 | // Populate AST with potentially promotable accesses and remove them from | ||||||||
| 2284 | // MaybePromotable, so they will not be checked again on the next iteration. | ||||||||
| 2285 | SmallPtrSet<Value *, 16> AttemptingPromotion; | ||||||||
| 2286 | llvm::erase_if(MaybePromotable, [&](Instruction *I) { | ||||||||
| 2287 | if (IsPotentiallyPromotable(I)) { | ||||||||
| 2288 | AttemptingPromotion.insert(I); | ||||||||
| 2289 | AST.add(I); | ||||||||
| 2290 | return true; | ||||||||
| 2291 | } | ||||||||
| 2292 | return false; | ||||||||
| 2293 | }); | ||||||||
| 2294 | |||||||||
| 2295 | // We're only interested in must-alias sets that contain a mod. | ||||||||
| 2296 | SmallVector<const AliasSet *, 8> Sets; | ||||||||
| 2297 | for (AliasSet &AS : AST) | ||||||||
| 2298 | if (!AS.isForwardingAliasSet() && AS.isMod() && AS.isMustAlias()) | ||||||||
| 2299 | Sets.push_back(&AS); | ||||||||
| 2300 | |||||||||
| 2301 | if (Sets.empty()) | ||||||||
| 2302 | return {}; // Nothing to promote... | ||||||||
| 2303 | |||||||||
| 2304 | // Discard any sets for which there is an aliasing non-promotable access. | ||||||||
| 2305 | foreachMemoryAccess(MSSA, L, [&](Instruction *I) { | ||||||||
| 2306 | if (AttemptingPromotion.contains(I)) | ||||||||
| 2307 | return; | ||||||||
| 2308 | |||||||||
| 2309 | llvm::erase_if(Sets, [&](const AliasSet *AS) { | ||||||||
| 2310 | return AS->aliasesUnknownInst(I, *AA); | ||||||||
| 2311 | }); | ||||||||
| 2312 | }); | ||||||||
| 2313 | |||||||||
| 2314 | SmallVector<SmallSetVector<Value *, 8>, 0> Result; | ||||||||
| 2315 | for (const AliasSet *Set : Sets) { | ||||||||
| 2316 | SmallSetVector<Value *, 8> PointerMustAliases; | ||||||||
| 2317 | for (const auto &ASI : *Set) | ||||||||
| 2318 | PointerMustAliases.insert(ASI.getValue()); | ||||||||
| 2319 | Result.push_back(std::move(PointerMustAliases)); | ||||||||
| 2320 | } | ||||||||
| 2321 | |||||||||
| 2322 | return Result; | ||||||||
| 2323 | } | ||||||||
| 2324 | |||||||||
| 2325 | /// Returns an owning pointer to an alias set which incorporates aliasing info | ||||||||
| 2326 | /// from L and all subloops of L. | ||||||||
| 2327 | std::unique_ptr<AliasSetTracker> | ||||||||
| 2328 | LoopInvariantCodeMotion::collectAliasInfoForLoop(Loop *L, LoopInfo *LI, | ||||||||
| 2329 | AAResults *AA) { | ||||||||
| 2330 | auto CurAST = std::make_unique<AliasSetTracker>(*AA); | ||||||||
| 2331 | |||||||||
| 2332 | // Add everything from all the sub loops. | ||||||||
| 2333 | for (Loop *InnerL : L->getSubLoops()) | ||||||||
| 2334 | for (BasicBlock *BB : InnerL->blocks()) | ||||||||
| 2335 | CurAST->add(*BB); | ||||||||
| 2336 | |||||||||
| 2337 | // And merge in this loop (without anything from inner loops). | ||||||||
| 2338 | for (BasicBlock *BB : L->blocks()) | ||||||||
| 2339 | if (LI->getLoopFor(BB) == L) | ||||||||
| 2340 | CurAST->add(*BB); | ||||||||
| 2341 | |||||||||
| 2342 | return CurAST; | ||||||||
| 2343 | } | ||||||||
| 2344 | |||||||||
| 2345 | static bool pointerInvalidatedByLoop(MemoryLocation MemLoc, | ||||||||
| 2346 | AliasSetTracker *CurAST, Loop *CurLoop, | ||||||||
| 2347 | AAResults *AA) { | ||||||||
| 2348 | // First check to see if any of the basic blocks in CurLoop invalidate *V. | ||||||||
| 2349 | bool isInvalidatedAccordingToAST = CurAST->getAliasSetFor(MemLoc).isMod(); | ||||||||
| 2350 | |||||||||
| 2351 | if (!isInvalidatedAccordingToAST || !LICMN2Theshold) | ||||||||
| 2352 | return isInvalidatedAccordingToAST; | ||||||||
| 2353 | |||||||||
| 2354 | // Check with a diagnostic analysis if we can refine the information above. | ||||||||
| 2355 | // This is to identify the limitations of using the AST. | ||||||||
| 2356 | // The alias set mechanism used by LICM has a major weakness in that it | ||||||||
| 2357 | // combines all things which may alias into a single set *before* asking | ||||||||
| 2358 | // modref questions. As a result, a single readonly call within a loop will | ||||||||
| 2359 | // collapse all loads and stores into a single alias set and report | ||||||||
| 2360 | // invalidation if the loop contains any store. For example, readonly calls | ||||||||
| 2361 | // with deopt states have this form and create a general alias set with all | ||||||||
| 2362 | // loads and stores. In order to get any LICM in loops containing possible | ||||||||
| 2363 | // deopt states we need a more precise invalidation of checking the mod ref | ||||||||
| 2364 | // info of each instruction within the loop and LI. This has a complexity of | ||||||||
| 2365 | // O(N^2), so currently, it is used only as a diagnostic tool since the | ||||||||
| 2366 | // default value of LICMN2Threshold is zero. | ||||||||
| 2367 | |||||||||
| 2368 | // Don't look at nested loops. | ||||||||
| 2369 | if (CurLoop->begin() != CurLoop->end()) | ||||||||
| 2370 | return true; | ||||||||
| 2371 | |||||||||
| 2372 | int N = 0; | ||||||||
| 2373 | for (BasicBlock *BB : CurLoop->getBlocks()) | ||||||||
| 2374 | for (Instruction &I : *BB) { | ||||||||
| 2375 | if (N >= LICMN2Theshold) { | ||||||||
| 2376 | LLVM_DEBUG(dbgs() << "Alasing N2 threshold exhausted for "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "Alasing N2 threshold exhausted for " << *(MemLoc.Ptr) << "\n"; } } while (false) | ||||||||
| 2377 | << *(MemLoc.Ptr) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "Alasing N2 threshold exhausted for " << *(MemLoc.Ptr) << "\n"; } } while (false); | ||||||||
| 2378 | return true; | ||||||||
| 2379 | } | ||||||||
| 2380 | N++; | ||||||||
| 2381 | auto Res = AA->getModRefInfo(&I, MemLoc); | ||||||||
| 2382 | if (isModSet(Res)) { | ||||||||
| 2383 | LLVM_DEBUG(dbgs() << "Aliasing failed on " << I << " for "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "Aliasing failed on " << I << " for " << *(MemLoc.Ptr) << "\n"; } } while (false ) | ||||||||
| 2384 | << *(MemLoc.Ptr) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "Aliasing failed on " << I << " for " << *(MemLoc.Ptr) << "\n"; } } while (false ); | ||||||||
| 2385 | return true; | ||||||||
| 2386 | } | ||||||||
| 2387 | } | ||||||||
| 2388 | LLVM_DEBUG(dbgs() << "Aliasing okay for " << *(MemLoc.Ptr) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("licm")) { dbgs() << "Aliasing okay for " << *(MemLoc .Ptr) << "\n"; } } while (false); | ||||||||
| 2389 | return false; | ||||||||
| 2390 | } | ||||||||
| 2391 | |||||||||
| 2392 | bool pointerInvalidatedByLoopWithMSSA(MemorySSA *MSSA, MemoryUse *MU, | ||||||||
| 2393 | Loop *CurLoop, Instruction &I, | ||||||||
| 2394 | SinkAndHoistLICMFlags &Flags) { | ||||||||
| 2395 | // For hoisting, use the walker to determine safety | ||||||||
| 2396 | if (!Flags.getIsSink()) { | ||||||||
| 2397 | MemoryAccess *Source; | ||||||||
| 2398 | // See declaration of SetLicmMssaOptCap for usage details. | ||||||||
| 2399 | if (Flags.tooManyClobberingCalls()) | ||||||||
| 2400 | Source = MU->getDefiningAccess(); | ||||||||
| 2401 | else { | ||||||||
| 2402 | Source = MSSA->getSkipSelfWalker()->getClobberingMemoryAccess(MU); | ||||||||
| 2403 | Flags.incrementClobberingCalls(); | ||||||||
| 2404 | } | ||||||||
| 2405 | return !MSSA->isLiveOnEntryDef(Source) && | ||||||||
| 2406 | CurLoop->contains(Source->getBlock()); | ||||||||
| 2407 | } | ||||||||
| 2408 | |||||||||
| 2409 | // For sinking, we'd need to check all Defs below this use. The getClobbering | ||||||||
| 2410 | // call will look on the backedge of the loop, but will check aliasing with | ||||||||
| 2411 | // the instructions on the previous iteration. | ||||||||
| 2412 | // For example: | ||||||||
| 2413 | // for (i ... ) | ||||||||
| 2414 | // load a[i] ( Use (LoE) | ||||||||
| 2415 | // store a[i] ( 1 = Def (2), with 2 = Phi for the loop. | ||||||||
| 2416 | // i++; | ||||||||
| 2417 | // The load sees no clobbering inside the loop, as the backedge alias check | ||||||||
| 2418 | // does phi translation, and will check aliasing against store a[i-1]. | ||||||||
| 2419 | // However sinking the load outside the loop, below the store is incorrect. | ||||||||
| 2420 | |||||||||
| 2421 | // For now, only sink if there are no Defs in the loop, and the existing ones | ||||||||
| 2422 | // precede the use and are in the same block. | ||||||||
| 2423 | // FIXME: Increase precision: Safe to sink if Use post dominates the Def; | ||||||||
| 2424 | // needs PostDominatorTreeAnalysis. | ||||||||
| 2425 | // FIXME: More precise: no Defs that alias this Use. | ||||||||
| 2426 | if (Flags.tooManyMemoryAccesses()) | ||||||||
| 2427 | return true; | ||||||||
| 2428 | for (auto *BB : CurLoop->getBlocks()) | ||||||||
| 2429 | if (pointerInvalidatedByBlockWithMSSA(*BB, *MSSA, *MU)) | ||||||||
| 2430 | return true; | ||||||||
| 2431 | // When sinking, the source block may not be part of the loop so check it. | ||||||||
| 2432 | if (!CurLoop->contains(&I)) | ||||||||
| 2433 | return pointerInvalidatedByBlockWithMSSA(*I.getParent(), *MSSA, *MU); | ||||||||
| 2434 | |||||||||
| 2435 | return false; | ||||||||
| 2436 | } | ||||||||
| 2437 | |||||||||
| 2438 | bool pointerInvalidatedByBlockWithMSSA(BasicBlock &BB, MemorySSA &MSSA, | ||||||||
| 2439 | MemoryUse &MU) { | ||||||||
| 2440 | if (const auto *Accesses = MSSA.getBlockDefs(&BB)) | ||||||||
| 2441 | for (const auto &MA : *Accesses) | ||||||||
| 2442 | if (const auto *MD = dyn_cast<MemoryDef>(&MA)) | ||||||||
| 2443 | if (MU.getBlock() != MD->getBlock() || !MSSA.locallyDominates(MD, &MU)) | ||||||||
| 2444 | return true; | ||||||||
| 2445 | return false; | ||||||||
| 2446 | } | ||||||||
| 2447 | |||||||||
| 2448 | /// Little predicate that returns true if the specified basic block is in | ||||||||
| 2449 | /// a subloop of the current one, not the current one itself. | ||||||||
| 2450 | /// | ||||||||
| 2451 | static bool inSubLoop(BasicBlock *BB, Loop *CurLoop, LoopInfo *LI) { | ||||||||
| 2452 | assert(CurLoop->contains(BB) && "Only valid if BB is IN the loop")((CurLoop->contains(BB) && "Only valid if BB is IN the loop" ) ? static_cast<void> (0) : __assert_fail ("CurLoop->contains(BB) && \"Only valid if BB is IN the loop\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/lib/Transforms/Scalar/LICM.cpp" , 2452, __PRETTY_FUNCTION__)); | ||||||||
| 2453 | return LI->getLoopFor(BB) != CurLoop; | ||||||||
| 2454 | } |
| 1 | //===- llvm/Instructions.h - Instruction subclass definitions ---*- C++ -*-===// |
| 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 | // This file exposes the class definitions of all of the subclasses of the |
| 10 | // Instruction class. This is meant to be an easy way to get access to all |
| 11 | // instruction subclasses. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #ifndef LLVM_IR_INSTRUCTIONS_H |
| 16 | #define LLVM_IR_INSTRUCTIONS_H |
| 17 | |
| 18 | #include "llvm/ADT/ArrayRef.h" |
| 19 | #include "llvm/ADT/Bitfields.h" |
| 20 | #include "llvm/ADT/None.h" |
| 21 | #include "llvm/ADT/STLExtras.h" |
| 22 | #include "llvm/ADT/SmallVector.h" |
| 23 | #include "llvm/ADT/StringRef.h" |
| 24 | #include "llvm/ADT/Twine.h" |
| 25 | #include "llvm/ADT/iterator.h" |
| 26 | #include "llvm/ADT/iterator_range.h" |
| 27 | #include "llvm/IR/Attributes.h" |
| 28 | #include "llvm/IR/BasicBlock.h" |
| 29 | #include "llvm/IR/CallingConv.h" |
| 30 | #include "llvm/IR/CFG.h" |
| 31 | #include "llvm/IR/Constant.h" |
| 32 | #include "llvm/IR/DerivedTypes.h" |
| 33 | #include "llvm/IR/Function.h" |
| 34 | #include "llvm/IR/InstrTypes.h" |
| 35 | #include "llvm/IR/Instruction.h" |
| 36 | #include "llvm/IR/OperandTraits.h" |
| 37 | #include "llvm/IR/Type.h" |
| 38 | #include "llvm/IR/Use.h" |
| 39 | #include "llvm/IR/User.h" |
| 40 | #include "llvm/IR/Value.h" |
| 41 | #include "llvm/Support/AtomicOrdering.h" |
| 42 | #include "llvm/Support/Casting.h" |
| 43 | #include "llvm/Support/ErrorHandling.h" |
| 44 | #include <cassert> |
| 45 | #include <cstddef> |
| 46 | #include <cstdint> |
| 47 | #include <iterator> |
| 48 | |
| 49 | namespace llvm { |
| 50 | |
| 51 | class APInt; |
| 52 | class ConstantInt; |
| 53 | class DataLayout; |
| 54 | class LLVMContext; |
| 55 | |
| 56 | //===----------------------------------------------------------------------===// |
| 57 | // AllocaInst Class |
| 58 | //===----------------------------------------------------------------------===// |
| 59 | |
| 60 | /// an instruction to allocate memory on the stack |
| 61 | class AllocaInst : public UnaryInstruction { |
| 62 | Type *AllocatedType; |
| 63 | |
| 64 | using AlignmentField = AlignmentBitfieldElementT<0>; |
| 65 | using UsedWithInAllocaField = BoolBitfieldElementT<AlignmentField::NextBit>; |
| 66 | using SwiftErrorField = BoolBitfieldElementT<UsedWithInAllocaField::NextBit>; |
| 67 | static_assert(Bitfield::areContiguous<AlignmentField, UsedWithInAllocaField, |
| 68 | SwiftErrorField>(), |
| 69 | "Bitfields must be contiguous"); |
| 70 | |
| 71 | protected: |
| 72 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 73 | friend class Instruction; |
| 74 | |
| 75 | AllocaInst *cloneImpl() const; |
| 76 | |
| 77 | public: |
| 78 | explicit AllocaInst(Type *Ty, unsigned AddrSpace, Value *ArraySize, |
| 79 | const Twine &Name, Instruction *InsertBefore); |
| 80 | AllocaInst(Type *Ty, unsigned AddrSpace, Value *ArraySize, |
| 81 | const Twine &Name, BasicBlock *InsertAtEnd); |
| 82 | |
| 83 | AllocaInst(Type *Ty, unsigned AddrSpace, const Twine &Name, |
| 84 | Instruction *InsertBefore); |
| 85 | AllocaInst(Type *Ty, unsigned AddrSpace, |
| 86 | const Twine &Name, BasicBlock *InsertAtEnd); |
| 87 | |
| 88 | AllocaInst(Type *Ty, unsigned AddrSpace, Value *ArraySize, Align Align, |
| 89 | const Twine &Name = "", Instruction *InsertBefore = nullptr); |
| 90 | AllocaInst(Type *Ty, unsigned AddrSpace, Value *ArraySize, Align Align, |
| 91 | const Twine &Name, BasicBlock *InsertAtEnd); |
| 92 | |
| 93 | /// Return true if there is an allocation size parameter to the allocation |
| 94 | /// instruction that is not 1. |
| 95 | bool isArrayAllocation() const; |
| 96 | |
| 97 | /// Get the number of elements allocated. For a simple allocation of a single |
| 98 | /// element, this will return a constant 1 value. |
| 99 | const Value *getArraySize() const { return getOperand(0); } |
| 100 | Value *getArraySize() { return getOperand(0); } |
| 101 | |
| 102 | /// Overload to return most specific pointer type. |
| 103 | PointerType *getType() const { |
| 104 | return cast<PointerType>(Instruction::getType()); |
| 105 | } |
| 106 | |
| 107 | /// Get allocation size in bits. Returns None if size can't be determined, |
| 108 | /// e.g. in case of a VLA. |
| 109 | Optional<TypeSize> getAllocationSizeInBits(const DataLayout &DL) const; |
| 110 | |
| 111 | /// Return the type that is being allocated by the instruction. |
| 112 | Type *getAllocatedType() const { return AllocatedType; } |
| 113 | /// for use only in special circumstances that need to generically |
| 114 | /// transform a whole instruction (eg: IR linking and vectorization). |
| 115 | void setAllocatedType(Type *Ty) { AllocatedType = Ty; } |
| 116 | |
| 117 | /// Return the alignment of the memory that is being allocated by the |
| 118 | /// instruction. |
| 119 | Align getAlign() const { |
| 120 | return Align(1ULL << getSubclassData<AlignmentField>()); |
| 121 | } |
| 122 | |
| 123 | void setAlignment(Align Align) { |
| 124 | setSubclassData<AlignmentField>(Log2(Align)); |
| 125 | } |
| 126 | |
| 127 | // FIXME: Remove this one transition to Align is over. |
| 128 | unsigned getAlignment() const { return getAlign().value(); } |
| 129 | |
| 130 | /// Return true if this alloca is in the entry block of the function and is a |
| 131 | /// constant size. If so, the code generator will fold it into the |
| 132 | /// prolog/epilog code, so it is basically free. |
| 133 | bool isStaticAlloca() const; |
| 134 | |
| 135 | /// Return true if this alloca is used as an inalloca argument to a call. Such |
| 136 | /// allocas are never considered static even if they are in the entry block. |
| 137 | bool isUsedWithInAlloca() const { |
| 138 | return getSubclassData<UsedWithInAllocaField>(); |
| 139 | } |
| 140 | |
| 141 | /// Specify whether this alloca is used to represent the arguments to a call. |
| 142 | void setUsedWithInAlloca(bool V) { |
| 143 | setSubclassData<UsedWithInAllocaField>(V); |
| 144 | } |
| 145 | |
| 146 | /// Return true if this alloca is used as a swifterror argument to a call. |
| 147 | bool isSwiftError() const { return getSubclassData<SwiftErrorField>(); } |
| 148 | /// Specify whether this alloca is used to represent a swifterror. |
| 149 | void setSwiftError(bool V) { setSubclassData<SwiftErrorField>(V); } |
| 150 | |
| 151 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 152 | static bool classof(const Instruction *I) { |
| 153 | return (I->getOpcode() == Instruction::Alloca); |
| 154 | } |
| 155 | static bool classof(const Value *V) { |
| 156 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 157 | } |
| 158 | |
| 159 | private: |
| 160 | // Shadow Instruction::setInstructionSubclassData with a private forwarding |
| 161 | // method so that subclasses cannot accidentally use it. |
| 162 | template <typename Bitfield> |
| 163 | void setSubclassData(typename Bitfield::Type Value) { |
| 164 | Instruction::setSubclassData<Bitfield>(Value); |
| 165 | } |
| 166 | }; |
| 167 | |
| 168 | //===----------------------------------------------------------------------===// |
| 169 | // LoadInst Class |
| 170 | //===----------------------------------------------------------------------===// |
| 171 | |
| 172 | /// An instruction for reading from memory. This uses the SubclassData field in |
| 173 | /// Value to store whether or not the load is volatile. |
| 174 | class LoadInst : public UnaryInstruction { |
| 175 | using VolatileField = BoolBitfieldElementT<0>; |
| 176 | using AlignmentField = AlignmentBitfieldElementT<VolatileField::NextBit>; |
| 177 | using OrderingField = AtomicOrderingBitfieldElementT<AlignmentField::NextBit>; |
| 178 | static_assert( |
| 179 | Bitfield::areContiguous<VolatileField, AlignmentField, OrderingField>(), |
| 180 | "Bitfields must be contiguous"); |
| 181 | |
| 182 | void AssertOK(); |
| 183 | |
| 184 | protected: |
| 185 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 186 | friend class Instruction; |
| 187 | |
| 188 | LoadInst *cloneImpl() const; |
| 189 | |
| 190 | public: |
| 191 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, |
| 192 | Instruction *InsertBefore); |
| 193 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 194 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, bool isVolatile, |
| 195 | Instruction *InsertBefore); |
| 196 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, bool isVolatile, |
| 197 | BasicBlock *InsertAtEnd); |
| 198 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, bool isVolatile, |
| 199 | Align Align, Instruction *InsertBefore = nullptr); |
| 200 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, bool isVolatile, |
| 201 | Align Align, BasicBlock *InsertAtEnd); |
| 202 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, bool isVolatile, |
| 203 | Align Align, AtomicOrdering Order, |
| 204 | SyncScope::ID SSID = SyncScope::System, |
| 205 | Instruction *InsertBefore = nullptr); |
| 206 | LoadInst(Type *Ty, Value *Ptr, const Twine &NameStr, bool isVolatile, |
| 207 | Align Align, AtomicOrdering Order, SyncScope::ID SSID, |
| 208 | BasicBlock *InsertAtEnd); |
| 209 | |
| 210 | /// Return true if this is a load from a volatile memory location. |
| 211 | bool isVolatile() const { return getSubclassData<VolatileField>(); } |
| 212 | |
| 213 | /// Specify whether this is a volatile load or not. |
| 214 | void setVolatile(bool V) { setSubclassData<VolatileField>(V); } |
| 215 | |
| 216 | /// Return the alignment of the access that is being performed. |
| 217 | /// FIXME: Remove this function once transition to Align is over. |
| 218 | /// Use getAlign() instead. |
| 219 | unsigned getAlignment() const { return getAlign().value(); } |
| 220 | |
| 221 | /// Return the alignment of the access that is being performed. |
| 222 | Align getAlign() const { |
| 223 | return Align(1ULL << (getSubclassData<AlignmentField>())); |
| 224 | } |
| 225 | |
| 226 | void setAlignment(Align Align) { |
| 227 | setSubclassData<AlignmentField>(Log2(Align)); |
| 228 | } |
| 229 | |
| 230 | /// Returns the ordering constraint of this load instruction. |
| 231 | AtomicOrdering getOrdering() const { |
| 232 | return getSubclassData<OrderingField>(); |
| 233 | } |
| 234 | /// Sets the ordering constraint of this load instruction. May not be Release |
| 235 | /// or AcquireRelease. |
| 236 | void setOrdering(AtomicOrdering Ordering) { |
| 237 | setSubclassData<OrderingField>(Ordering); |
| 238 | } |
| 239 | |
| 240 | /// Returns the synchronization scope ID of this load instruction. |
| 241 | SyncScope::ID getSyncScopeID() const { |
| 242 | return SSID; |
| 243 | } |
| 244 | |
| 245 | /// Sets the synchronization scope ID of this load instruction. |
| 246 | void setSyncScopeID(SyncScope::ID SSID) { |
| 247 | this->SSID = SSID; |
| 248 | } |
| 249 | |
| 250 | /// Sets the ordering constraint and the synchronization scope ID of this load |
| 251 | /// instruction. |
| 252 | void setAtomic(AtomicOrdering Ordering, |
| 253 | SyncScope::ID SSID = SyncScope::System) { |
| 254 | setOrdering(Ordering); |
| 255 | setSyncScopeID(SSID); |
| 256 | } |
| 257 | |
| 258 | bool isSimple() const { return !isAtomic() && !isVolatile(); } |
| 259 | |
| 260 | bool isUnordered() const { |
| 261 | return (getOrdering() == AtomicOrdering::NotAtomic || |
| 262 | getOrdering() == AtomicOrdering::Unordered) && |
| 263 | !isVolatile(); |
| 264 | } |
| 265 | |
| 266 | Value *getPointerOperand() { return getOperand(0); } |
| 267 | const Value *getPointerOperand() const { return getOperand(0); } |
| 268 | static unsigned getPointerOperandIndex() { return 0U; } |
| 269 | Type *getPointerOperandType() const { return getPointerOperand()->getType(); } |
| 270 | |
| 271 | /// Returns the address space of the pointer operand. |
| 272 | unsigned getPointerAddressSpace() const { |
| 273 | return getPointerOperandType()->getPointerAddressSpace(); |
| 274 | } |
| 275 | |
| 276 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 277 | static bool classof(const Instruction *I) { |
| 278 | return I->getOpcode() == Instruction::Load; |
| 279 | } |
| 280 | static bool classof(const Value *V) { |
| 281 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 282 | } |
| 283 | |
| 284 | private: |
| 285 | // Shadow Instruction::setInstructionSubclassData with a private forwarding |
| 286 | // method so that subclasses cannot accidentally use it. |
| 287 | template <typename Bitfield> |
| 288 | void setSubclassData(typename Bitfield::Type Value) { |
| 289 | Instruction::setSubclassData<Bitfield>(Value); |
| 290 | } |
| 291 | |
| 292 | /// The synchronization scope ID of this load instruction. Not quite enough |
| 293 | /// room in SubClassData for everything, so synchronization scope ID gets its |
| 294 | /// own field. |
| 295 | SyncScope::ID SSID; |
| 296 | }; |
| 297 | |
| 298 | //===----------------------------------------------------------------------===// |
| 299 | // StoreInst Class |
| 300 | //===----------------------------------------------------------------------===// |
| 301 | |
| 302 | /// An instruction for storing to memory. |
| 303 | class StoreInst : public Instruction { |
| 304 | using VolatileField = BoolBitfieldElementT<0>; |
| 305 | using AlignmentField = AlignmentBitfieldElementT<VolatileField::NextBit>; |
| 306 | using OrderingField = AtomicOrderingBitfieldElementT<AlignmentField::NextBit>; |
| 307 | static_assert( |
| 308 | Bitfield::areContiguous<VolatileField, AlignmentField, OrderingField>(), |
| 309 | "Bitfields must be contiguous"); |
| 310 | |
| 311 | void AssertOK(); |
| 312 | |
| 313 | protected: |
| 314 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 315 | friend class Instruction; |
| 316 | |
| 317 | StoreInst *cloneImpl() const; |
| 318 | |
| 319 | public: |
| 320 | StoreInst(Value *Val, Value *Ptr, Instruction *InsertBefore); |
| 321 | StoreInst(Value *Val, Value *Ptr, BasicBlock *InsertAtEnd); |
| 322 | StoreInst(Value *Val, Value *Ptr, bool isVolatile, Instruction *InsertBefore); |
| 323 | StoreInst(Value *Val, Value *Ptr, bool isVolatile, BasicBlock *InsertAtEnd); |
| 324 | StoreInst(Value *Val, Value *Ptr, bool isVolatile, Align Align, |
| 325 | Instruction *InsertBefore = nullptr); |
| 326 | StoreInst(Value *Val, Value *Ptr, bool isVolatile, Align Align, |
| 327 | BasicBlock *InsertAtEnd); |
| 328 | StoreInst(Value *Val, Value *Ptr, bool isVolatile, Align Align, |
| 329 | AtomicOrdering Order, SyncScope::ID SSID = SyncScope::System, |
| 330 | Instruction *InsertBefore = nullptr); |
| 331 | StoreInst(Value *Val, Value *Ptr, bool isVolatile, Align Align, |
| 332 | AtomicOrdering Order, SyncScope::ID SSID, BasicBlock *InsertAtEnd); |
| 333 | |
| 334 | // allocate space for exactly two operands |
| 335 | void *operator new(size_t s) { |
| 336 | return User::operator new(s, 2); |
| 337 | } |
| 338 | |
| 339 | /// Return true if this is a store to a volatile memory location. |
| 340 | bool isVolatile() const { return getSubclassData<VolatileField>(); } |
| 341 | |
| 342 | /// Specify whether this is a volatile store or not. |
| 343 | void setVolatile(bool V) { setSubclassData<VolatileField>(V); } |
| 344 | |
| 345 | /// Transparently provide more efficient getOperand methods. |
| 346 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 347 | |
| 348 | /// Return the alignment of the access that is being performed |
| 349 | /// FIXME: Remove this function once transition to Align is over. |
| 350 | /// Use getAlign() instead. |
| 351 | unsigned getAlignment() const { return getAlign().value(); } |
| 352 | |
| 353 | Align getAlign() const { |
| 354 | return Align(1ULL << (getSubclassData<AlignmentField>())); |
| 355 | } |
| 356 | |
| 357 | void setAlignment(Align Align) { |
| 358 | setSubclassData<AlignmentField>(Log2(Align)); |
| 359 | } |
| 360 | |
| 361 | /// Returns the ordering constraint of this store instruction. |
| 362 | AtomicOrdering getOrdering() const { |
| 363 | return getSubclassData<OrderingField>(); |
| 364 | } |
| 365 | |
| 366 | /// Sets the ordering constraint of this store instruction. May not be |
| 367 | /// Acquire or AcquireRelease. |
| 368 | void setOrdering(AtomicOrdering Ordering) { |
| 369 | setSubclassData<OrderingField>(Ordering); |
| 370 | } |
| 371 | |
| 372 | /// Returns the synchronization scope ID of this store instruction. |
| 373 | SyncScope::ID getSyncScopeID() const { |
| 374 | return SSID; |
| 375 | } |
| 376 | |
| 377 | /// Sets the synchronization scope ID of this store instruction. |
| 378 | void setSyncScopeID(SyncScope::ID SSID) { |
| 379 | this->SSID = SSID; |
| 380 | } |
| 381 | |
| 382 | /// Sets the ordering constraint and the synchronization scope ID of this |
| 383 | /// store instruction. |
| 384 | void setAtomic(AtomicOrdering Ordering, |
| 385 | SyncScope::ID SSID = SyncScope::System) { |
| 386 | setOrdering(Ordering); |
| 387 | setSyncScopeID(SSID); |
| 388 | } |
| 389 | |
| 390 | bool isSimple() const { return !isAtomic() && !isVolatile(); } |
| 391 | |
| 392 | bool isUnordered() const { |
| 393 | return (getOrdering() == AtomicOrdering::NotAtomic || |
| 394 | getOrdering() == AtomicOrdering::Unordered) && |
| 395 | !isVolatile(); |
| 396 | } |
| 397 | |
| 398 | Value *getValueOperand() { return getOperand(0); } |
| 399 | const Value *getValueOperand() const { return getOperand(0); } |
| 400 | |
| 401 | Value *getPointerOperand() { return getOperand(1); } |
| 402 | const Value *getPointerOperand() const { return getOperand(1); } |
| 403 | static unsigned getPointerOperandIndex() { return 1U; } |
| 404 | Type *getPointerOperandType() const { return getPointerOperand()->getType(); } |
| 405 | |
| 406 | /// Returns the address space of the pointer operand. |
| 407 | unsigned getPointerAddressSpace() const { |
| 408 | return getPointerOperandType()->getPointerAddressSpace(); |
| 409 | } |
| 410 | |
| 411 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 412 | static bool classof(const Instruction *I) { |
| 413 | return I->getOpcode() == Instruction::Store; |
| 414 | } |
| 415 | static bool classof(const Value *V) { |
| 416 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 417 | } |
| 418 | |
| 419 | private: |
| 420 | // Shadow Instruction::setInstructionSubclassData with a private forwarding |
| 421 | // method so that subclasses cannot accidentally use it. |
| 422 | template <typename Bitfield> |
| 423 | void setSubclassData(typename Bitfield::Type Value) { |
| 424 | Instruction::setSubclassData<Bitfield>(Value); |
| 425 | } |
| 426 | |
| 427 | /// The synchronization scope ID of this store instruction. Not quite enough |
| 428 | /// room in SubClassData for everything, so synchronization scope ID gets its |
| 429 | /// own field. |
| 430 | SyncScope::ID SSID; |
| 431 | }; |
| 432 | |
| 433 | template <> |
| 434 | struct OperandTraits<StoreInst> : public FixedNumOperandTraits<StoreInst, 2> { |
| 435 | }; |
| 436 | |
| 437 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(StoreInst, Value)StoreInst::op_iterator StoreInst::op_begin() { return OperandTraits <StoreInst>::op_begin(this); } StoreInst::const_op_iterator StoreInst::op_begin() const { return OperandTraits<StoreInst >::op_begin(const_cast<StoreInst*>(this)); } StoreInst ::op_iterator StoreInst::op_end() { return OperandTraits<StoreInst >::op_end(this); } StoreInst::const_op_iterator StoreInst:: op_end() const { return OperandTraits<StoreInst>::op_end (const_cast<StoreInst*>(this)); } Value *StoreInst::getOperand (unsigned i_nocapture) const { ((i_nocapture < OperandTraits <StoreInst>::operands(this) && "getOperand() out of range!" ) ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<StoreInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 437, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<StoreInst>::op_begin(const_cast<StoreInst *>(this))[i_nocapture].get()); } void StoreInst::setOperand (unsigned i_nocapture, Value *Val_nocapture) { ((i_nocapture < OperandTraits<StoreInst>::operands(this) && "setOperand() out of range!" ) ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<StoreInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 437, __PRETTY_FUNCTION__)); OperandTraits<StoreInst>:: op_begin(this)[i_nocapture] = Val_nocapture; } unsigned StoreInst ::getNumOperands() const { return OperandTraits<StoreInst> ::operands(this); } template <int Idx_nocapture> Use & StoreInst::Op() { return this->OpFrom<Idx_nocapture> (this); } template <int Idx_nocapture> const Use &StoreInst ::Op() const { return this->OpFrom<Idx_nocapture>(this ); } |
| 438 | |
| 439 | //===----------------------------------------------------------------------===// |
| 440 | // FenceInst Class |
| 441 | //===----------------------------------------------------------------------===// |
| 442 | |
| 443 | /// An instruction for ordering other memory operations. |
| 444 | class FenceInst : public Instruction { |
| 445 | using OrderingField = AtomicOrderingBitfieldElementT<0>; |
| 446 | |
| 447 | void Init(AtomicOrdering Ordering, SyncScope::ID SSID); |
| 448 | |
| 449 | protected: |
| 450 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 451 | friend class Instruction; |
| 452 | |
| 453 | FenceInst *cloneImpl() const; |
| 454 | |
| 455 | public: |
| 456 | // Ordering may only be Acquire, Release, AcquireRelease, or |
| 457 | // SequentiallyConsistent. |
| 458 | FenceInst(LLVMContext &C, AtomicOrdering Ordering, |
| 459 | SyncScope::ID SSID = SyncScope::System, |
| 460 | Instruction *InsertBefore = nullptr); |
| 461 | FenceInst(LLVMContext &C, AtomicOrdering Ordering, SyncScope::ID SSID, |
| 462 | BasicBlock *InsertAtEnd); |
| 463 | |
| 464 | // allocate space for exactly zero operands |
| 465 | void *operator new(size_t s) { |
| 466 | return User::operator new(s, 0); |
| 467 | } |
| 468 | |
| 469 | /// Returns the ordering constraint of this fence instruction. |
| 470 | AtomicOrdering getOrdering() const { |
| 471 | return getSubclassData<OrderingField>(); |
| 472 | } |
| 473 | |
| 474 | /// Sets the ordering constraint of this fence instruction. May only be |
| 475 | /// Acquire, Release, AcquireRelease, or SequentiallyConsistent. |
| 476 | void setOrdering(AtomicOrdering Ordering) { |
| 477 | setSubclassData<OrderingField>(Ordering); |
| 478 | } |
| 479 | |
| 480 | /// Returns the synchronization scope ID of this fence instruction. |
| 481 | SyncScope::ID getSyncScopeID() const { |
| 482 | return SSID; |
| 483 | } |
| 484 | |
| 485 | /// Sets the synchronization scope ID of this fence instruction. |
| 486 | void setSyncScopeID(SyncScope::ID SSID) { |
| 487 | this->SSID = SSID; |
| 488 | } |
| 489 | |
| 490 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 491 | static bool classof(const Instruction *I) { |
| 492 | return I->getOpcode() == Instruction::Fence; |
| 493 | } |
| 494 | static bool classof(const Value *V) { |
| 495 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 496 | } |
| 497 | |
| 498 | private: |
| 499 | // Shadow Instruction::setInstructionSubclassData with a private forwarding |
| 500 | // method so that subclasses cannot accidentally use it. |
| 501 | template <typename Bitfield> |
| 502 | void setSubclassData(typename Bitfield::Type Value) { |
| 503 | Instruction::setSubclassData<Bitfield>(Value); |
| 504 | } |
| 505 | |
| 506 | /// The synchronization scope ID of this fence instruction. Not quite enough |
| 507 | /// room in SubClassData for everything, so synchronization scope ID gets its |
| 508 | /// own field. |
| 509 | SyncScope::ID SSID; |
| 510 | }; |
| 511 | |
| 512 | //===----------------------------------------------------------------------===// |
| 513 | // AtomicCmpXchgInst Class |
| 514 | //===----------------------------------------------------------------------===// |
| 515 | |
| 516 | /// An instruction that atomically checks whether a |
| 517 | /// specified value is in a memory location, and, if it is, stores a new value |
| 518 | /// there. The value returned by this instruction is a pair containing the |
| 519 | /// original value as first element, and an i1 indicating success (true) or |
| 520 | /// failure (false) as second element. |
| 521 | /// |
| 522 | class AtomicCmpXchgInst : public Instruction { |
| 523 | void Init(Value *Ptr, Value *Cmp, Value *NewVal, Align Align, |
| 524 | AtomicOrdering SuccessOrdering, AtomicOrdering FailureOrdering, |
| 525 | SyncScope::ID SSID); |
| 526 | |
| 527 | template <unsigned Offset> |
| 528 | using AtomicOrderingBitfieldElement = |
| 529 | typename Bitfield::Element<AtomicOrdering, Offset, 3, |
| 530 | AtomicOrdering::LAST>; |
| 531 | |
| 532 | protected: |
| 533 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 534 | friend class Instruction; |
| 535 | |
| 536 | AtomicCmpXchgInst *cloneImpl() const; |
| 537 | |
| 538 | public: |
| 539 | AtomicCmpXchgInst(Value *Ptr, Value *Cmp, Value *NewVal, Align Alignment, |
| 540 | AtomicOrdering SuccessOrdering, |
| 541 | AtomicOrdering FailureOrdering, SyncScope::ID SSID, |
| 542 | Instruction *InsertBefore = nullptr); |
| 543 | AtomicCmpXchgInst(Value *Ptr, Value *Cmp, Value *NewVal, Align Alignment, |
| 544 | AtomicOrdering SuccessOrdering, |
| 545 | AtomicOrdering FailureOrdering, SyncScope::ID SSID, |
| 546 | BasicBlock *InsertAtEnd); |
| 547 | |
| 548 | // allocate space for exactly three operands |
| 549 | void *operator new(size_t s) { |
| 550 | return User::operator new(s, 3); |
| 551 | } |
| 552 | |
| 553 | using VolatileField = BoolBitfieldElementT<0>; |
| 554 | using WeakField = BoolBitfieldElementT<VolatileField::NextBit>; |
| 555 | using SuccessOrderingField = |
| 556 | AtomicOrderingBitfieldElementT<WeakField::NextBit>; |
| 557 | using FailureOrderingField = |
| 558 | AtomicOrderingBitfieldElementT<SuccessOrderingField::NextBit>; |
| 559 | using AlignmentField = |
| 560 | AlignmentBitfieldElementT<FailureOrderingField::NextBit>; |
| 561 | static_assert( |
| 562 | Bitfield::areContiguous<VolatileField, WeakField, SuccessOrderingField, |
| 563 | FailureOrderingField, AlignmentField>(), |
| 564 | "Bitfields must be contiguous"); |
| 565 | |
| 566 | /// Return the alignment of the memory that is being allocated by the |
| 567 | /// instruction. |
| 568 | Align getAlign() const { |
| 569 | return Align(1ULL << getSubclassData<AlignmentField>()); |
| 570 | } |
| 571 | |
| 572 | void setAlignment(Align Align) { |
| 573 | setSubclassData<AlignmentField>(Log2(Align)); |
| 574 | } |
| 575 | |
| 576 | /// Return true if this is a cmpxchg from a volatile memory |
| 577 | /// location. |
| 578 | /// |
| 579 | bool isVolatile() const { return getSubclassData<VolatileField>(); } |
| 580 | |
| 581 | /// Specify whether this is a volatile cmpxchg. |
| 582 | /// |
| 583 | void setVolatile(bool V) { setSubclassData<VolatileField>(V); } |
| 584 | |
| 585 | /// Return true if this cmpxchg may spuriously fail. |
| 586 | bool isWeak() const { return getSubclassData<WeakField>(); } |
| 587 | |
| 588 | void setWeak(bool IsWeak) { setSubclassData<WeakField>(IsWeak); } |
| 589 | |
| 590 | /// Transparently provide more efficient getOperand methods. |
| 591 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 592 | |
| 593 | /// Returns the success ordering constraint of this cmpxchg instruction. |
| 594 | AtomicOrdering getSuccessOrdering() const { |
| 595 | return getSubclassData<SuccessOrderingField>(); |
| 596 | } |
| 597 | |
| 598 | /// Sets the success ordering constraint of this cmpxchg instruction. |
| 599 | void setSuccessOrdering(AtomicOrdering Ordering) { |
| 600 | assert(Ordering != AtomicOrdering::NotAtomic &&((Ordering != AtomicOrdering::NotAtomic && "CmpXchg instructions can only be atomic." ) ? static_cast<void> (0) : __assert_fail ("Ordering != AtomicOrdering::NotAtomic && \"CmpXchg instructions can only be atomic.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 601, __PRETTY_FUNCTION__)) |
| 601 | "CmpXchg instructions can only be atomic.")((Ordering != AtomicOrdering::NotAtomic && "CmpXchg instructions can only be atomic." ) ? static_cast<void> (0) : __assert_fail ("Ordering != AtomicOrdering::NotAtomic && \"CmpXchg instructions can only be atomic.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 601, __PRETTY_FUNCTION__)); |
| 602 | setSubclassData<SuccessOrderingField>(Ordering); |
| 603 | } |
| 604 | |
| 605 | /// Returns the failure ordering constraint of this cmpxchg instruction. |
| 606 | AtomicOrdering getFailureOrdering() const { |
| 607 | return getSubclassData<FailureOrderingField>(); |
| 608 | } |
| 609 | |
| 610 | /// Sets the failure ordering constraint of this cmpxchg instruction. |
| 611 | void setFailureOrdering(AtomicOrdering Ordering) { |
| 612 | assert(Ordering != AtomicOrdering::NotAtomic &&((Ordering != AtomicOrdering::NotAtomic && "CmpXchg instructions can only be atomic." ) ? static_cast<void> (0) : __assert_fail ("Ordering != AtomicOrdering::NotAtomic && \"CmpXchg instructions can only be atomic.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 613, __PRETTY_FUNCTION__)) |
| 613 | "CmpXchg instructions can only be atomic.")((Ordering != AtomicOrdering::NotAtomic && "CmpXchg instructions can only be atomic." ) ? static_cast<void> (0) : __assert_fail ("Ordering != AtomicOrdering::NotAtomic && \"CmpXchg instructions can only be atomic.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 613, __PRETTY_FUNCTION__)); |
| 614 | setSubclassData<FailureOrderingField>(Ordering); |
| 615 | } |
| 616 | |
| 617 | /// Returns the synchronization scope ID of this cmpxchg instruction. |
| 618 | SyncScope::ID getSyncScopeID() const { |
| 619 | return SSID; |
| 620 | } |
| 621 | |
| 622 | /// Sets the synchronization scope ID of this cmpxchg instruction. |
| 623 | void setSyncScopeID(SyncScope::ID SSID) { |
| 624 | this->SSID = SSID; |
| 625 | } |
| 626 | |
| 627 | Value *getPointerOperand() { return getOperand(0); } |
| 628 | const Value *getPointerOperand() const { return getOperand(0); } |
| 629 | static unsigned getPointerOperandIndex() { return 0U; } |
| 630 | |
| 631 | Value *getCompareOperand() { return getOperand(1); } |
| 632 | const Value *getCompareOperand() const { return getOperand(1); } |
| 633 | |
| 634 | Value *getNewValOperand() { return getOperand(2); } |
| 635 | const Value *getNewValOperand() const { return getOperand(2); } |
| 636 | |
| 637 | /// Returns the address space of the pointer operand. |
| 638 | unsigned getPointerAddressSpace() const { |
| 639 | return getPointerOperand()->getType()->getPointerAddressSpace(); |
| 640 | } |
| 641 | |
| 642 | /// Returns the strongest permitted ordering on failure, given the |
| 643 | /// desired ordering on success. |
| 644 | /// |
| 645 | /// If the comparison in a cmpxchg operation fails, there is no atomic store |
| 646 | /// so release semantics cannot be provided. So this function drops explicit |
| 647 | /// Release requests from the AtomicOrdering. A SequentiallyConsistent |
| 648 | /// operation would remain SequentiallyConsistent. |
| 649 | static AtomicOrdering |
| 650 | getStrongestFailureOrdering(AtomicOrdering SuccessOrdering) { |
| 651 | switch (SuccessOrdering) { |
| 652 | default: |
| 653 | llvm_unreachable("invalid cmpxchg success ordering")::llvm::llvm_unreachable_internal("invalid cmpxchg success ordering" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 653); |
| 654 | case AtomicOrdering::Release: |
| 655 | case AtomicOrdering::Monotonic: |
| 656 | return AtomicOrdering::Monotonic; |
| 657 | case AtomicOrdering::AcquireRelease: |
| 658 | case AtomicOrdering::Acquire: |
| 659 | return AtomicOrdering::Acquire; |
| 660 | case AtomicOrdering::SequentiallyConsistent: |
| 661 | return AtomicOrdering::SequentiallyConsistent; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 666 | static bool classof(const Instruction *I) { |
| 667 | return I->getOpcode() == Instruction::AtomicCmpXchg; |
| 668 | } |
| 669 | static bool classof(const Value *V) { |
| 670 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 671 | } |
| 672 | |
| 673 | private: |
| 674 | // Shadow Instruction::setInstructionSubclassData with a private forwarding |
| 675 | // method so that subclasses cannot accidentally use it. |
| 676 | template <typename Bitfield> |
| 677 | void setSubclassData(typename Bitfield::Type Value) { |
| 678 | Instruction::setSubclassData<Bitfield>(Value); |
| 679 | } |
| 680 | |
| 681 | /// The synchronization scope ID of this cmpxchg instruction. Not quite |
| 682 | /// enough room in SubClassData for everything, so synchronization scope ID |
| 683 | /// gets its own field. |
| 684 | SyncScope::ID SSID; |
| 685 | }; |
| 686 | |
| 687 | template <> |
| 688 | struct OperandTraits<AtomicCmpXchgInst> : |
| 689 | public FixedNumOperandTraits<AtomicCmpXchgInst, 3> { |
| 690 | }; |
| 691 | |
| 692 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(AtomicCmpXchgInst, Value)AtomicCmpXchgInst::op_iterator AtomicCmpXchgInst::op_begin() { return OperandTraits<AtomicCmpXchgInst>::op_begin(this ); } AtomicCmpXchgInst::const_op_iterator AtomicCmpXchgInst:: op_begin() const { return OperandTraits<AtomicCmpXchgInst> ::op_begin(const_cast<AtomicCmpXchgInst*>(this)); } AtomicCmpXchgInst ::op_iterator AtomicCmpXchgInst::op_end() { return OperandTraits <AtomicCmpXchgInst>::op_end(this); } AtomicCmpXchgInst:: const_op_iterator AtomicCmpXchgInst::op_end() const { return OperandTraits <AtomicCmpXchgInst>::op_end(const_cast<AtomicCmpXchgInst *>(this)); } Value *AtomicCmpXchgInst::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<AtomicCmpXchgInst >::operands(this) && "getOperand() out of range!") ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<AtomicCmpXchgInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 692, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<AtomicCmpXchgInst>::op_begin(const_cast <AtomicCmpXchgInst*>(this))[i_nocapture].get()); } void AtomicCmpXchgInst::setOperand(unsigned i_nocapture, Value *Val_nocapture ) { ((i_nocapture < OperandTraits<AtomicCmpXchgInst> ::operands(this) && "setOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<AtomicCmpXchgInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 692, __PRETTY_FUNCTION__)); OperandTraits<AtomicCmpXchgInst >::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned AtomicCmpXchgInst::getNumOperands() const { return OperandTraits <AtomicCmpXchgInst>::operands(this); } template <int Idx_nocapture> Use &AtomicCmpXchgInst::Op() { return this ->OpFrom<Idx_nocapture>(this); } template <int Idx_nocapture > const Use &AtomicCmpXchgInst::Op() const { return this ->OpFrom<Idx_nocapture>(this); } |
| 693 | |
| 694 | //===----------------------------------------------------------------------===// |
| 695 | // AtomicRMWInst Class |
| 696 | //===----------------------------------------------------------------------===// |
| 697 | |
| 698 | /// an instruction that atomically reads a memory location, |
| 699 | /// combines it with another value, and then stores the result back. Returns |
| 700 | /// the old value. |
| 701 | /// |
| 702 | class AtomicRMWInst : public Instruction { |
| 703 | protected: |
| 704 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 705 | friend class Instruction; |
| 706 | |
| 707 | AtomicRMWInst *cloneImpl() const; |
| 708 | |
| 709 | public: |
| 710 | /// This enumeration lists the possible modifications atomicrmw can make. In |
| 711 | /// the descriptions, 'p' is the pointer to the instruction's memory location, |
| 712 | /// 'old' is the initial value of *p, and 'v' is the other value passed to the |
| 713 | /// instruction. These instructions always return 'old'. |
| 714 | enum BinOp : unsigned { |
| 715 | /// *p = v |
| 716 | Xchg, |
| 717 | /// *p = old + v |
| 718 | Add, |
| 719 | /// *p = old - v |
| 720 | Sub, |
| 721 | /// *p = old & v |
| 722 | And, |
| 723 | /// *p = ~(old & v) |
| 724 | Nand, |
| 725 | /// *p = old | v |
| 726 | Or, |
| 727 | /// *p = old ^ v |
| 728 | Xor, |
| 729 | /// *p = old >signed v ? old : v |
| 730 | Max, |
| 731 | /// *p = old <signed v ? old : v |
| 732 | Min, |
| 733 | /// *p = old >unsigned v ? old : v |
| 734 | UMax, |
| 735 | /// *p = old <unsigned v ? old : v |
| 736 | UMin, |
| 737 | |
| 738 | /// *p = old + v |
| 739 | FAdd, |
| 740 | |
| 741 | /// *p = old - v |
| 742 | FSub, |
| 743 | |
| 744 | FIRST_BINOP = Xchg, |
| 745 | LAST_BINOP = FSub, |
| 746 | BAD_BINOP |
| 747 | }; |
| 748 | |
| 749 | private: |
| 750 | template <unsigned Offset> |
| 751 | using AtomicOrderingBitfieldElement = |
| 752 | typename Bitfield::Element<AtomicOrdering, Offset, 3, |
| 753 | AtomicOrdering::LAST>; |
| 754 | |
| 755 | template <unsigned Offset> |
| 756 | using BinOpBitfieldElement = |
| 757 | typename Bitfield::Element<BinOp, Offset, 4, BinOp::LAST_BINOP>; |
| 758 | |
| 759 | public: |
| 760 | AtomicRMWInst(BinOp Operation, Value *Ptr, Value *Val, Align Alignment, |
| 761 | AtomicOrdering Ordering, SyncScope::ID SSID, |
| 762 | Instruction *InsertBefore = nullptr); |
| 763 | AtomicRMWInst(BinOp Operation, Value *Ptr, Value *Val, Align Alignment, |
| 764 | AtomicOrdering Ordering, SyncScope::ID SSID, |
| 765 | BasicBlock *InsertAtEnd); |
| 766 | |
| 767 | // allocate space for exactly two operands |
| 768 | void *operator new(size_t s) { |
| 769 | return User::operator new(s, 2); |
| 770 | } |
| 771 | |
| 772 | using VolatileField = BoolBitfieldElementT<0>; |
| 773 | using AtomicOrderingField = |
| 774 | AtomicOrderingBitfieldElementT<VolatileField::NextBit>; |
| 775 | using OperationField = BinOpBitfieldElement<AtomicOrderingField::NextBit>; |
| 776 | using AlignmentField = AlignmentBitfieldElementT<OperationField::NextBit>; |
| 777 | static_assert(Bitfield::areContiguous<VolatileField, AtomicOrderingField, |
| 778 | OperationField, AlignmentField>(), |
| 779 | "Bitfields must be contiguous"); |
| 780 | |
| 781 | BinOp getOperation() const { return getSubclassData<OperationField>(); } |
| 782 | |
| 783 | static StringRef getOperationName(BinOp Op); |
| 784 | |
| 785 | static bool isFPOperation(BinOp Op) { |
| 786 | switch (Op) { |
| 787 | case AtomicRMWInst::FAdd: |
| 788 | case AtomicRMWInst::FSub: |
| 789 | return true; |
| 790 | default: |
| 791 | return false; |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | void setOperation(BinOp Operation) { |
| 796 | setSubclassData<OperationField>(Operation); |
| 797 | } |
| 798 | |
| 799 | /// Return the alignment of the memory that is being allocated by the |
| 800 | /// instruction. |
| 801 | Align getAlign() const { |
| 802 | return Align(1ULL << getSubclassData<AlignmentField>()); |
| 803 | } |
| 804 | |
| 805 | void setAlignment(Align Align) { |
| 806 | setSubclassData<AlignmentField>(Log2(Align)); |
| 807 | } |
| 808 | |
| 809 | /// Return true if this is a RMW on a volatile memory location. |
| 810 | /// |
| 811 | bool isVolatile() const { return getSubclassData<VolatileField>(); } |
| 812 | |
| 813 | /// Specify whether this is a volatile RMW or not. |
| 814 | /// |
| 815 | void setVolatile(bool V) { setSubclassData<VolatileField>(V); } |
| 816 | |
| 817 | /// Transparently provide more efficient getOperand methods. |
| 818 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 819 | |
| 820 | /// Returns the ordering constraint of this rmw instruction. |
| 821 | AtomicOrdering getOrdering() const { |
| 822 | return getSubclassData<AtomicOrderingField>(); |
| 823 | } |
| 824 | |
| 825 | /// Sets the ordering constraint of this rmw instruction. |
| 826 | void setOrdering(AtomicOrdering Ordering) { |
| 827 | assert(Ordering != AtomicOrdering::NotAtomic &&((Ordering != AtomicOrdering::NotAtomic && "atomicrmw instructions can only be atomic." ) ? static_cast<void> (0) : __assert_fail ("Ordering != AtomicOrdering::NotAtomic && \"atomicrmw instructions can only be atomic.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 828, __PRETTY_FUNCTION__)) |
| 828 | "atomicrmw instructions can only be atomic.")((Ordering != AtomicOrdering::NotAtomic && "atomicrmw instructions can only be atomic." ) ? static_cast<void> (0) : __assert_fail ("Ordering != AtomicOrdering::NotAtomic && \"atomicrmw instructions can only be atomic.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 828, __PRETTY_FUNCTION__)); |
| 829 | setSubclassData<AtomicOrderingField>(Ordering); |
| 830 | } |
| 831 | |
| 832 | /// Returns the synchronization scope ID of this rmw instruction. |
| 833 | SyncScope::ID getSyncScopeID() const { |
| 834 | return SSID; |
| 835 | } |
| 836 | |
| 837 | /// Sets the synchronization scope ID of this rmw instruction. |
| 838 | void setSyncScopeID(SyncScope::ID SSID) { |
| 839 | this->SSID = SSID; |
| 840 | } |
| 841 | |
| 842 | Value *getPointerOperand() { return getOperand(0); } |
| 843 | const Value *getPointerOperand() const { return getOperand(0); } |
| 844 | static unsigned getPointerOperandIndex() { return 0U; } |
| 845 | |
| 846 | Value *getValOperand() { return getOperand(1); } |
| 847 | const Value *getValOperand() const { return getOperand(1); } |
| 848 | |
| 849 | /// Returns the address space of the pointer operand. |
| 850 | unsigned getPointerAddressSpace() const { |
| 851 | return getPointerOperand()->getType()->getPointerAddressSpace(); |
| 852 | } |
| 853 | |
| 854 | bool isFloatingPointOperation() const { |
| 855 | return isFPOperation(getOperation()); |
| 856 | } |
| 857 | |
| 858 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 859 | static bool classof(const Instruction *I) { |
| 860 | return I->getOpcode() == Instruction::AtomicRMW; |
| 861 | } |
| 862 | static bool classof(const Value *V) { |
| 863 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 864 | } |
| 865 | |
| 866 | private: |
| 867 | void Init(BinOp Operation, Value *Ptr, Value *Val, Align Align, |
| 868 | AtomicOrdering Ordering, SyncScope::ID SSID); |
| 869 | |
| 870 | // Shadow Instruction::setInstructionSubclassData with a private forwarding |
| 871 | // method so that subclasses cannot accidentally use it. |
| 872 | template <typename Bitfield> |
| 873 | void setSubclassData(typename Bitfield::Type Value) { |
| 874 | Instruction::setSubclassData<Bitfield>(Value); |
| 875 | } |
| 876 | |
| 877 | /// The synchronization scope ID of this rmw instruction. Not quite enough |
| 878 | /// room in SubClassData for everything, so synchronization scope ID gets its |
| 879 | /// own field. |
| 880 | SyncScope::ID SSID; |
| 881 | }; |
| 882 | |
| 883 | template <> |
| 884 | struct OperandTraits<AtomicRMWInst> |
| 885 | : public FixedNumOperandTraits<AtomicRMWInst,2> { |
| 886 | }; |
| 887 | |
| 888 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(AtomicRMWInst, Value)AtomicRMWInst::op_iterator AtomicRMWInst::op_begin() { return OperandTraits<AtomicRMWInst>::op_begin(this); } AtomicRMWInst ::const_op_iterator AtomicRMWInst::op_begin() const { return OperandTraits <AtomicRMWInst>::op_begin(const_cast<AtomicRMWInst*> (this)); } AtomicRMWInst::op_iterator AtomicRMWInst::op_end() { return OperandTraits<AtomicRMWInst>::op_end(this); } AtomicRMWInst::const_op_iterator AtomicRMWInst::op_end() const { return OperandTraits<AtomicRMWInst>::op_end(const_cast <AtomicRMWInst*>(this)); } Value *AtomicRMWInst::getOperand (unsigned i_nocapture) const { ((i_nocapture < OperandTraits <AtomicRMWInst>::operands(this) && "getOperand() out of range!" ) ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<AtomicRMWInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 888, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<AtomicRMWInst>::op_begin(const_cast< AtomicRMWInst*>(this))[i_nocapture].get()); } void AtomicRMWInst ::setOperand(unsigned i_nocapture, Value *Val_nocapture) { (( i_nocapture < OperandTraits<AtomicRMWInst>::operands (this) && "setOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<AtomicRMWInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 888, __PRETTY_FUNCTION__)); OperandTraits<AtomicRMWInst> ::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned AtomicRMWInst ::getNumOperands() const { return OperandTraits<AtomicRMWInst >::operands(this); } template <int Idx_nocapture> Use &AtomicRMWInst::Op() { return this->OpFrom<Idx_nocapture >(this); } template <int Idx_nocapture> const Use & AtomicRMWInst::Op() const { return this->OpFrom<Idx_nocapture >(this); } |
| 889 | |
| 890 | //===----------------------------------------------------------------------===// |
| 891 | // GetElementPtrInst Class |
| 892 | //===----------------------------------------------------------------------===// |
| 893 | |
| 894 | // checkGEPType - Simple wrapper function to give a better assertion failure |
| 895 | // message on bad indexes for a gep instruction. |
| 896 | // |
| 897 | inline Type *checkGEPType(Type *Ty) { |
| 898 | assert(Ty && "Invalid GetElementPtrInst indices for type!")((Ty && "Invalid GetElementPtrInst indices for type!" ) ? static_cast<void> (0) : __assert_fail ("Ty && \"Invalid GetElementPtrInst indices for type!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 898, __PRETTY_FUNCTION__)); |
| 899 | return Ty; |
| 900 | } |
| 901 | |
| 902 | /// an instruction for type-safe pointer arithmetic to |
| 903 | /// access elements of arrays and structs |
| 904 | /// |
| 905 | class GetElementPtrInst : public Instruction { |
| 906 | Type *SourceElementType; |
| 907 | Type *ResultElementType; |
| 908 | |
| 909 | GetElementPtrInst(const GetElementPtrInst &GEPI); |
| 910 | |
| 911 | /// Constructors - Create a getelementptr instruction with a base pointer an |
| 912 | /// list of indices. The first ctor can optionally insert before an existing |
| 913 | /// instruction, the second appends the new instruction to the specified |
| 914 | /// BasicBlock. |
| 915 | inline GetElementPtrInst(Type *PointeeType, Value *Ptr, |
| 916 | ArrayRef<Value *> IdxList, unsigned Values, |
| 917 | const Twine &NameStr, Instruction *InsertBefore); |
| 918 | inline GetElementPtrInst(Type *PointeeType, Value *Ptr, |
| 919 | ArrayRef<Value *> IdxList, unsigned Values, |
| 920 | const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 921 | |
| 922 | void init(Value *Ptr, ArrayRef<Value *> IdxList, const Twine &NameStr); |
| 923 | |
| 924 | protected: |
| 925 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 926 | friend class Instruction; |
| 927 | |
| 928 | GetElementPtrInst *cloneImpl() const; |
| 929 | |
| 930 | public: |
| 931 | static GetElementPtrInst *Create(Type *PointeeType, Value *Ptr, |
| 932 | ArrayRef<Value *> IdxList, |
| 933 | const Twine &NameStr = "", |
| 934 | Instruction *InsertBefore = nullptr) { |
| 935 | unsigned Values = 1 + unsigned(IdxList.size()); |
| 936 | if (!PointeeType) |
| 937 | PointeeType = |
| 938 | cast<PointerType>(Ptr->getType()->getScalarType())->getElementType(); |
| 939 | else |
| 940 | assert(((PointeeType == cast<PointerType>(Ptr->getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("PointeeType == cast<PointerType>(Ptr->getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 942, __PRETTY_FUNCTION__)) |
| 941 | PointeeType ==((PointeeType == cast<PointerType>(Ptr->getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("PointeeType == cast<PointerType>(Ptr->getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 942, __PRETTY_FUNCTION__)) |
| 942 | cast<PointerType>(Ptr->getType()->getScalarType())->getElementType())((PointeeType == cast<PointerType>(Ptr->getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("PointeeType == cast<PointerType>(Ptr->getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 942, __PRETTY_FUNCTION__)); |
| 943 | return new (Values) GetElementPtrInst(PointeeType, Ptr, IdxList, Values, |
| 944 | NameStr, InsertBefore); |
| 945 | } |
| 946 | |
| 947 | static GetElementPtrInst *Create(Type *PointeeType, Value *Ptr, |
| 948 | ArrayRef<Value *> IdxList, |
| 949 | const Twine &NameStr, |
| 950 | BasicBlock *InsertAtEnd) { |
| 951 | unsigned Values = 1 + unsigned(IdxList.size()); |
| 952 | if (!PointeeType) |
| 953 | PointeeType = |
| 954 | cast<PointerType>(Ptr->getType()->getScalarType())->getElementType(); |
| 955 | else |
| 956 | assert(((PointeeType == cast<PointerType>(Ptr->getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("PointeeType == cast<PointerType>(Ptr->getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 958, __PRETTY_FUNCTION__)) |
| 957 | PointeeType ==((PointeeType == cast<PointerType>(Ptr->getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("PointeeType == cast<PointerType>(Ptr->getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 958, __PRETTY_FUNCTION__)) |
| 958 | cast<PointerType>(Ptr->getType()->getScalarType())->getElementType())((PointeeType == cast<PointerType>(Ptr->getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("PointeeType == cast<PointerType>(Ptr->getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 958, __PRETTY_FUNCTION__)); |
| 959 | return new (Values) GetElementPtrInst(PointeeType, Ptr, IdxList, Values, |
| 960 | NameStr, InsertAtEnd); |
| 961 | } |
| 962 | |
| 963 | /// Create an "inbounds" getelementptr. See the documentation for the |
| 964 | /// "inbounds" flag in LangRef.html for details. |
| 965 | static GetElementPtrInst *CreateInBounds(Value *Ptr, |
| 966 | ArrayRef<Value *> IdxList, |
| 967 | const Twine &NameStr = "", |
| 968 | Instruction *InsertBefore = nullptr){ |
| 969 | return CreateInBounds(nullptr, Ptr, IdxList, NameStr, InsertBefore); |
| 970 | } |
| 971 | |
| 972 | static GetElementPtrInst * |
| 973 | CreateInBounds(Type *PointeeType, Value *Ptr, ArrayRef<Value *> IdxList, |
| 974 | const Twine &NameStr = "", |
| 975 | Instruction *InsertBefore = nullptr) { |
| 976 | GetElementPtrInst *GEP = |
| 977 | Create(PointeeType, Ptr, IdxList, NameStr, InsertBefore); |
| 978 | GEP->setIsInBounds(true); |
| 979 | return GEP; |
| 980 | } |
| 981 | |
| 982 | static GetElementPtrInst *CreateInBounds(Value *Ptr, |
| 983 | ArrayRef<Value *> IdxList, |
| 984 | const Twine &NameStr, |
| 985 | BasicBlock *InsertAtEnd) { |
| 986 | return CreateInBounds(nullptr, Ptr, IdxList, NameStr, InsertAtEnd); |
| 987 | } |
| 988 | |
| 989 | static GetElementPtrInst *CreateInBounds(Type *PointeeType, Value *Ptr, |
| 990 | ArrayRef<Value *> IdxList, |
| 991 | const Twine &NameStr, |
| 992 | BasicBlock *InsertAtEnd) { |
| 993 | GetElementPtrInst *GEP = |
| 994 | Create(PointeeType, Ptr, IdxList, NameStr, InsertAtEnd); |
| 995 | GEP->setIsInBounds(true); |
| 996 | return GEP; |
| 997 | } |
| 998 | |
| 999 | /// Transparently provide more efficient getOperand methods. |
| 1000 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 1001 | |
| 1002 | Type *getSourceElementType() const { return SourceElementType; } |
| 1003 | |
| 1004 | void setSourceElementType(Type *Ty) { SourceElementType = Ty; } |
| 1005 | void setResultElementType(Type *Ty) { ResultElementType = Ty; } |
| 1006 | |
| 1007 | Type *getResultElementType() const { |
| 1008 | assert(ResultElementType ==((ResultElementType == cast<PointerType>(getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("ResultElementType == cast<PointerType>(getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1009, __PRETTY_FUNCTION__)) |
| 1009 | cast<PointerType>(getType()->getScalarType())->getElementType())((ResultElementType == cast<PointerType>(getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("ResultElementType == cast<PointerType>(getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1009, __PRETTY_FUNCTION__)); |
| 1010 | return ResultElementType; |
| 1011 | } |
| 1012 | |
| 1013 | /// Returns the address space of this instruction's pointer type. |
| 1014 | unsigned getAddressSpace() const { |
| 1015 | // Note that this is always the same as the pointer operand's address space |
| 1016 | // and that is cheaper to compute, so cheat here. |
| 1017 | return getPointerAddressSpace(); |
| 1018 | } |
| 1019 | |
| 1020 | /// Returns the result type of a getelementptr with the given source |
| 1021 | /// element type and indexes. |
| 1022 | /// |
| 1023 | /// Null is returned if the indices are invalid for the specified |
| 1024 | /// source element type. |
| 1025 | static Type *getIndexedType(Type *Ty, ArrayRef<Value *> IdxList); |
| 1026 | static Type *getIndexedType(Type *Ty, ArrayRef<Constant *> IdxList); |
| 1027 | static Type *getIndexedType(Type *Ty, ArrayRef<uint64_t> IdxList); |
| 1028 | |
| 1029 | /// Return the type of the element at the given index of an indexable |
| 1030 | /// type. This is equivalent to "getIndexedType(Agg, {Zero, Idx})". |
| 1031 | /// |
| 1032 | /// Returns null if the type can't be indexed, or the given index is not |
| 1033 | /// legal for the given type. |
| 1034 | static Type *getTypeAtIndex(Type *Ty, Value *Idx); |
| 1035 | static Type *getTypeAtIndex(Type *Ty, uint64_t Idx); |
| 1036 | |
| 1037 | inline op_iterator idx_begin() { return op_begin()+1; } |
| 1038 | inline const_op_iterator idx_begin() const { return op_begin()+1; } |
| 1039 | inline op_iterator idx_end() { return op_end(); } |
| 1040 | inline const_op_iterator idx_end() const { return op_end(); } |
| 1041 | |
| 1042 | inline iterator_range<op_iterator> indices() { |
| 1043 | return make_range(idx_begin(), idx_end()); |
| 1044 | } |
| 1045 | |
| 1046 | inline iterator_range<const_op_iterator> indices() const { |
| 1047 | return make_range(idx_begin(), idx_end()); |
| 1048 | } |
| 1049 | |
| 1050 | Value *getPointerOperand() { |
| 1051 | return getOperand(0); |
| 1052 | } |
| 1053 | const Value *getPointerOperand() const { |
| 1054 | return getOperand(0); |
| 1055 | } |
| 1056 | static unsigned getPointerOperandIndex() { |
| 1057 | return 0U; // get index for modifying correct operand. |
| 1058 | } |
| 1059 | |
| 1060 | /// Method to return the pointer operand as a |
| 1061 | /// PointerType. |
| 1062 | Type *getPointerOperandType() const { |
| 1063 | return getPointerOperand()->getType(); |
| 1064 | } |
| 1065 | |
| 1066 | /// Returns the address space of the pointer operand. |
| 1067 | unsigned getPointerAddressSpace() const { |
| 1068 | return getPointerOperandType()->getPointerAddressSpace(); |
| 1069 | } |
| 1070 | |
| 1071 | /// Returns the pointer type returned by the GEP |
| 1072 | /// instruction, which may be a vector of pointers. |
| 1073 | static Type *getGEPReturnType(Type *ElTy, Value *Ptr, |
| 1074 | ArrayRef<Value *> IdxList) { |
| 1075 | Type *PtrTy = PointerType::get(checkGEPType(getIndexedType(ElTy, IdxList)), |
| 1076 | Ptr->getType()->getPointerAddressSpace()); |
| 1077 | // Vector GEP |
| 1078 | if (auto *PtrVTy = dyn_cast<VectorType>(Ptr->getType())) { |
| 1079 | ElementCount EltCount = PtrVTy->getElementCount(); |
| 1080 | return VectorType::get(PtrTy, EltCount); |
| 1081 | } |
| 1082 | for (Value *Index : IdxList) |
| 1083 | if (auto *IndexVTy = dyn_cast<VectorType>(Index->getType())) { |
| 1084 | ElementCount EltCount = IndexVTy->getElementCount(); |
| 1085 | return VectorType::get(PtrTy, EltCount); |
| 1086 | } |
| 1087 | // Scalar GEP |
| 1088 | return PtrTy; |
| 1089 | } |
| 1090 | |
| 1091 | unsigned getNumIndices() const { // Note: always non-negative |
| 1092 | return getNumOperands() - 1; |
| 1093 | } |
| 1094 | |
| 1095 | bool hasIndices() const { |
| 1096 | return getNumOperands() > 1; |
| 1097 | } |
| 1098 | |
| 1099 | /// Return true if all of the indices of this GEP are |
| 1100 | /// zeros. If so, the result pointer and the first operand have the same |
| 1101 | /// value, just potentially different types. |
| 1102 | bool hasAllZeroIndices() const; |
| 1103 | |
| 1104 | /// Return true if all of the indices of this GEP are |
| 1105 | /// constant integers. If so, the result pointer and the first operand have |
| 1106 | /// a constant offset between them. |
| 1107 | bool hasAllConstantIndices() const; |
| 1108 | |
| 1109 | /// Set or clear the inbounds flag on this GEP instruction. |
| 1110 | /// See LangRef.html for the meaning of inbounds on a getelementptr. |
| 1111 | void setIsInBounds(bool b = true); |
| 1112 | |
| 1113 | /// Determine whether the GEP has the inbounds flag. |
| 1114 | bool isInBounds() const; |
| 1115 | |
| 1116 | /// Accumulate the constant address offset of this GEP if possible. |
| 1117 | /// |
| 1118 | /// This routine accepts an APInt into which it will accumulate the constant |
| 1119 | /// offset of this GEP if the GEP is in fact constant. If the GEP is not |
| 1120 | /// all-constant, it returns false and the value of the offset APInt is |
| 1121 | /// undefined (it is *not* preserved!). The APInt passed into this routine |
| 1122 | /// must be at least as wide as the IntPtr type for the address space of |
| 1123 | /// the base GEP pointer. |
| 1124 | bool accumulateConstantOffset(const DataLayout &DL, APInt &Offset) const; |
| 1125 | |
| 1126 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1127 | static bool classof(const Instruction *I) { |
| 1128 | return (I->getOpcode() == Instruction::GetElementPtr); |
| 1129 | } |
| 1130 | static bool classof(const Value *V) { |
| 1131 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1132 | } |
| 1133 | }; |
| 1134 | |
| 1135 | template <> |
| 1136 | struct OperandTraits<GetElementPtrInst> : |
| 1137 | public VariadicOperandTraits<GetElementPtrInst, 1> { |
| 1138 | }; |
| 1139 | |
| 1140 | GetElementPtrInst::GetElementPtrInst(Type *PointeeType, Value *Ptr, |
| 1141 | ArrayRef<Value *> IdxList, unsigned Values, |
| 1142 | const Twine &NameStr, |
| 1143 | Instruction *InsertBefore) |
| 1144 | : Instruction(getGEPReturnType(PointeeType, Ptr, IdxList), GetElementPtr, |
| 1145 | OperandTraits<GetElementPtrInst>::op_end(this) - Values, |
| 1146 | Values, InsertBefore), |
| 1147 | SourceElementType(PointeeType), |
| 1148 | ResultElementType(getIndexedType(PointeeType, IdxList)) { |
| 1149 | assert(ResultElementType ==((ResultElementType == cast<PointerType>(getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("ResultElementType == cast<PointerType>(getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1150, __PRETTY_FUNCTION__)) |
| 1150 | cast<PointerType>(getType()->getScalarType())->getElementType())((ResultElementType == cast<PointerType>(getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("ResultElementType == cast<PointerType>(getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1150, __PRETTY_FUNCTION__)); |
| 1151 | init(Ptr, IdxList, NameStr); |
| 1152 | } |
| 1153 | |
| 1154 | GetElementPtrInst::GetElementPtrInst(Type *PointeeType, Value *Ptr, |
| 1155 | ArrayRef<Value *> IdxList, unsigned Values, |
| 1156 | const Twine &NameStr, |
| 1157 | BasicBlock *InsertAtEnd) |
| 1158 | : Instruction(getGEPReturnType(PointeeType, Ptr, IdxList), GetElementPtr, |
| 1159 | OperandTraits<GetElementPtrInst>::op_end(this) - Values, |
| 1160 | Values, InsertAtEnd), |
| 1161 | SourceElementType(PointeeType), |
| 1162 | ResultElementType(getIndexedType(PointeeType, IdxList)) { |
| 1163 | assert(ResultElementType ==((ResultElementType == cast<PointerType>(getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("ResultElementType == cast<PointerType>(getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1164, __PRETTY_FUNCTION__)) |
| 1164 | cast<PointerType>(getType()->getScalarType())->getElementType())((ResultElementType == cast<PointerType>(getType()-> getScalarType())->getElementType()) ? static_cast<void> (0) : __assert_fail ("ResultElementType == cast<PointerType>(getType()->getScalarType())->getElementType()" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1164, __PRETTY_FUNCTION__)); |
| 1165 | init(Ptr, IdxList, NameStr); |
| 1166 | } |
| 1167 | |
| 1168 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GetElementPtrInst, Value)GetElementPtrInst::op_iterator GetElementPtrInst::op_begin() { return OperandTraits<GetElementPtrInst>::op_begin(this ); } GetElementPtrInst::const_op_iterator GetElementPtrInst:: op_begin() const { return OperandTraits<GetElementPtrInst> ::op_begin(const_cast<GetElementPtrInst*>(this)); } GetElementPtrInst ::op_iterator GetElementPtrInst::op_end() { return OperandTraits <GetElementPtrInst>::op_end(this); } GetElementPtrInst:: const_op_iterator GetElementPtrInst::op_end() const { return OperandTraits <GetElementPtrInst>::op_end(const_cast<GetElementPtrInst *>(this)); } Value *GetElementPtrInst::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<GetElementPtrInst >::operands(this) && "getOperand() out of range!") ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<GetElementPtrInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1168, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<GetElementPtrInst>::op_begin(const_cast <GetElementPtrInst*>(this))[i_nocapture].get()); } void GetElementPtrInst::setOperand(unsigned i_nocapture, Value *Val_nocapture ) { ((i_nocapture < OperandTraits<GetElementPtrInst> ::operands(this) && "setOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<GetElementPtrInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1168, __PRETTY_FUNCTION__)); OperandTraits<GetElementPtrInst >::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned GetElementPtrInst::getNumOperands() const { return OperandTraits <GetElementPtrInst>::operands(this); } template <int Idx_nocapture> Use &GetElementPtrInst::Op() { return this ->OpFrom<Idx_nocapture>(this); } template <int Idx_nocapture > const Use &GetElementPtrInst::Op() const { return this ->OpFrom<Idx_nocapture>(this); } |
| 1169 | |
| 1170 | //===----------------------------------------------------------------------===// |
| 1171 | // ICmpInst Class |
| 1172 | //===----------------------------------------------------------------------===// |
| 1173 | |
| 1174 | /// This instruction compares its operands according to the predicate given |
| 1175 | /// to the constructor. It only operates on integers or pointers. The operands |
| 1176 | /// must be identical types. |
| 1177 | /// Represent an integer comparison operator. |
| 1178 | class ICmpInst: public CmpInst { |
| 1179 | void AssertOK() { |
| 1180 | assert(isIntPredicate() &&((isIntPredicate() && "Invalid ICmp predicate value") ? static_cast<void> (0) : __assert_fail ("isIntPredicate() && \"Invalid ICmp predicate value\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1181, __PRETTY_FUNCTION__)) |
| 1181 | "Invalid ICmp predicate value")((isIntPredicate() && "Invalid ICmp predicate value") ? static_cast<void> (0) : __assert_fail ("isIntPredicate() && \"Invalid ICmp predicate value\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1181, __PRETTY_FUNCTION__)); |
| 1182 | assert(getOperand(0)->getType() == getOperand(1)->getType() &&((getOperand(0)->getType() == getOperand(1)->getType() && "Both operands to ICmp instruction are not of the same type!" ) ? static_cast<void> (0) : __assert_fail ("getOperand(0)->getType() == getOperand(1)->getType() && \"Both operands to ICmp instruction are not of the same type!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1183, __PRETTY_FUNCTION__)) |
| 1183 | "Both operands to ICmp instruction are not of the same type!")((getOperand(0)->getType() == getOperand(1)->getType() && "Both operands to ICmp instruction are not of the same type!" ) ? static_cast<void> (0) : __assert_fail ("getOperand(0)->getType() == getOperand(1)->getType() && \"Both operands to ICmp instruction are not of the same type!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1183, __PRETTY_FUNCTION__)); |
| 1184 | // Check that the operands are the right type |
| 1185 | assert((getOperand(0)->getType()->isIntOrIntVectorTy() ||(((getOperand(0)->getType()->isIntOrIntVectorTy() || getOperand (0)->getType()->isPtrOrPtrVectorTy()) && "Invalid operand types for ICmp instruction" ) ? static_cast<void> (0) : __assert_fail ("(getOperand(0)->getType()->isIntOrIntVectorTy() || getOperand(0)->getType()->isPtrOrPtrVectorTy()) && \"Invalid operand types for ICmp instruction\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1187, __PRETTY_FUNCTION__)) |
| 1186 | getOperand(0)->getType()->isPtrOrPtrVectorTy()) &&(((getOperand(0)->getType()->isIntOrIntVectorTy() || getOperand (0)->getType()->isPtrOrPtrVectorTy()) && "Invalid operand types for ICmp instruction" ) ? static_cast<void> (0) : __assert_fail ("(getOperand(0)->getType()->isIntOrIntVectorTy() || getOperand(0)->getType()->isPtrOrPtrVectorTy()) && \"Invalid operand types for ICmp instruction\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1187, __PRETTY_FUNCTION__)) |
| 1187 | "Invalid operand types for ICmp instruction")(((getOperand(0)->getType()->isIntOrIntVectorTy() || getOperand (0)->getType()->isPtrOrPtrVectorTy()) && "Invalid operand types for ICmp instruction" ) ? static_cast<void> (0) : __assert_fail ("(getOperand(0)->getType()->isIntOrIntVectorTy() || getOperand(0)->getType()->isPtrOrPtrVectorTy()) && \"Invalid operand types for ICmp instruction\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1187, __PRETTY_FUNCTION__)); |
| 1188 | } |
| 1189 | |
| 1190 | protected: |
| 1191 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1192 | friend class Instruction; |
| 1193 | |
| 1194 | /// Clone an identical ICmpInst |
| 1195 | ICmpInst *cloneImpl() const; |
| 1196 | |
| 1197 | public: |
| 1198 | /// Constructor with insert-before-instruction semantics. |
| 1199 | ICmpInst( |
| 1200 | Instruction *InsertBefore, ///< Where to insert |
| 1201 | Predicate pred, ///< The predicate to use for the comparison |
| 1202 | Value *LHS, ///< The left-hand-side of the expression |
| 1203 | Value *RHS, ///< The right-hand-side of the expression |
| 1204 | const Twine &NameStr = "" ///< Name of the instruction |
| 1205 | ) : CmpInst(makeCmpResultType(LHS->getType()), |
| 1206 | Instruction::ICmp, pred, LHS, RHS, NameStr, |
| 1207 | InsertBefore) { |
| 1208 | #ifndef NDEBUG |
| 1209 | AssertOK(); |
| 1210 | #endif |
| 1211 | } |
| 1212 | |
| 1213 | /// Constructor with insert-at-end semantics. |
| 1214 | ICmpInst( |
| 1215 | BasicBlock &InsertAtEnd, ///< Block to insert into. |
| 1216 | Predicate pred, ///< The predicate to use for the comparison |
| 1217 | Value *LHS, ///< The left-hand-side of the expression |
| 1218 | Value *RHS, ///< The right-hand-side of the expression |
| 1219 | const Twine &NameStr = "" ///< Name of the instruction |
| 1220 | ) : CmpInst(makeCmpResultType(LHS->getType()), |
| 1221 | Instruction::ICmp, pred, LHS, RHS, NameStr, |
| 1222 | &InsertAtEnd) { |
| 1223 | #ifndef NDEBUG |
| 1224 | AssertOK(); |
| 1225 | #endif |
| 1226 | } |
| 1227 | |
| 1228 | /// Constructor with no-insertion semantics |
| 1229 | ICmpInst( |
| 1230 | Predicate pred, ///< The predicate to use for the comparison |
| 1231 | Value *LHS, ///< The left-hand-side of the expression |
| 1232 | Value *RHS, ///< The right-hand-side of the expression |
| 1233 | const Twine &NameStr = "" ///< Name of the instruction |
| 1234 | ) : CmpInst(makeCmpResultType(LHS->getType()), |
| 1235 | Instruction::ICmp, pred, LHS, RHS, NameStr) { |
| 1236 | #ifndef NDEBUG |
| 1237 | AssertOK(); |
| 1238 | #endif |
| 1239 | } |
| 1240 | |
| 1241 | /// For example, EQ->EQ, SLE->SLE, UGT->SGT, etc. |
| 1242 | /// @returns the predicate that would be the result if the operand were |
| 1243 | /// regarded as signed. |
| 1244 | /// Return the signed version of the predicate |
| 1245 | Predicate getSignedPredicate() const { |
| 1246 | return getSignedPredicate(getPredicate()); |
| 1247 | } |
| 1248 | |
| 1249 | /// This is a static version that you can use without an instruction. |
| 1250 | /// Return the signed version of the predicate. |
| 1251 | static Predicate getSignedPredicate(Predicate pred); |
| 1252 | |
| 1253 | /// For example, EQ->EQ, SLE->ULE, UGT->UGT, etc. |
| 1254 | /// @returns the predicate that would be the result if the operand were |
| 1255 | /// regarded as unsigned. |
| 1256 | /// Return the unsigned version of the predicate |
| 1257 | Predicate getUnsignedPredicate() const { |
| 1258 | return getUnsignedPredicate(getPredicate()); |
| 1259 | } |
| 1260 | |
| 1261 | /// This is a static version that you can use without an instruction. |
| 1262 | /// Return the unsigned version of the predicate. |
| 1263 | static Predicate getUnsignedPredicate(Predicate pred); |
| 1264 | |
| 1265 | /// Return true if this predicate is either EQ or NE. This also |
| 1266 | /// tests for commutativity. |
| 1267 | static bool isEquality(Predicate P) { |
| 1268 | return P == ICMP_EQ || P == ICMP_NE; |
| 1269 | } |
| 1270 | |
| 1271 | /// Return true if this predicate is either EQ or NE. This also |
| 1272 | /// tests for commutativity. |
| 1273 | bool isEquality() const { |
| 1274 | return isEquality(getPredicate()); |
| 1275 | } |
| 1276 | |
| 1277 | /// @returns true if the predicate of this ICmpInst is commutative |
| 1278 | /// Determine if this relation is commutative. |
| 1279 | bool isCommutative() const { return isEquality(); } |
| 1280 | |
| 1281 | /// Return true if the predicate is relational (not EQ or NE). |
| 1282 | /// |
| 1283 | bool isRelational() const { |
| 1284 | return !isEquality(); |
| 1285 | } |
| 1286 | |
| 1287 | /// Return true if the predicate is relational (not EQ or NE). |
| 1288 | /// |
| 1289 | static bool isRelational(Predicate P) { |
| 1290 | return !isEquality(P); |
| 1291 | } |
| 1292 | |
| 1293 | /// Return true if the predicate is SGT or UGT. |
| 1294 | /// |
| 1295 | static bool isGT(Predicate P) { |
| 1296 | return P == ICMP_SGT || P == ICMP_UGT; |
| 1297 | } |
| 1298 | |
| 1299 | /// Return true if the predicate is SLT or ULT. |
| 1300 | /// |
| 1301 | static bool isLT(Predicate P) { |
| 1302 | return P == ICMP_SLT || P == ICMP_ULT; |
| 1303 | } |
| 1304 | |
| 1305 | /// Return true if the predicate is SGE or UGE. |
| 1306 | /// |
| 1307 | static bool isGE(Predicate P) { |
| 1308 | return P == ICMP_SGE || P == ICMP_UGE; |
| 1309 | } |
| 1310 | |
| 1311 | /// Return true if the predicate is SLE or ULE. |
| 1312 | /// |
| 1313 | static bool isLE(Predicate P) { |
| 1314 | return P == ICMP_SLE || P == ICMP_ULE; |
| 1315 | } |
| 1316 | |
| 1317 | /// Exchange the two operands to this instruction in such a way that it does |
| 1318 | /// not modify the semantics of the instruction. The predicate value may be |
| 1319 | /// changed to retain the same result if the predicate is order dependent |
| 1320 | /// (e.g. ult). |
| 1321 | /// Swap operands and adjust predicate. |
| 1322 | void swapOperands() { |
| 1323 | setPredicate(getSwappedPredicate()); |
| 1324 | Op<0>().swap(Op<1>()); |
| 1325 | } |
| 1326 | |
| 1327 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1328 | static bool classof(const Instruction *I) { |
| 1329 | return I->getOpcode() == Instruction::ICmp; |
| 1330 | } |
| 1331 | static bool classof(const Value *V) { |
| 1332 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1333 | } |
| 1334 | }; |
| 1335 | |
| 1336 | //===----------------------------------------------------------------------===// |
| 1337 | // FCmpInst Class |
| 1338 | //===----------------------------------------------------------------------===// |
| 1339 | |
| 1340 | /// This instruction compares its operands according to the predicate given |
| 1341 | /// to the constructor. It only operates on floating point values or packed |
| 1342 | /// vectors of floating point values. The operands must be identical types. |
| 1343 | /// Represents a floating point comparison operator. |
| 1344 | class FCmpInst: public CmpInst { |
| 1345 | void AssertOK() { |
| 1346 | assert(isFPPredicate() && "Invalid FCmp predicate value")((isFPPredicate() && "Invalid FCmp predicate value") ? static_cast<void> (0) : __assert_fail ("isFPPredicate() && \"Invalid FCmp predicate value\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1346, __PRETTY_FUNCTION__)); |
| 1347 | assert(getOperand(0)->getType() == getOperand(1)->getType() &&((getOperand(0)->getType() == getOperand(1)->getType() && "Both operands to FCmp instruction are not of the same type!" ) ? static_cast<void> (0) : __assert_fail ("getOperand(0)->getType() == getOperand(1)->getType() && \"Both operands to FCmp instruction are not of the same type!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1348, __PRETTY_FUNCTION__)) |
| 1348 | "Both operands to FCmp instruction are not of the same type!")((getOperand(0)->getType() == getOperand(1)->getType() && "Both operands to FCmp instruction are not of the same type!" ) ? static_cast<void> (0) : __assert_fail ("getOperand(0)->getType() == getOperand(1)->getType() && \"Both operands to FCmp instruction are not of the same type!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1348, __PRETTY_FUNCTION__)); |
| 1349 | // Check that the operands are the right type |
| 1350 | assert(getOperand(0)->getType()->isFPOrFPVectorTy() &&((getOperand(0)->getType()->isFPOrFPVectorTy() && "Invalid operand types for FCmp instruction") ? static_cast< void> (0) : __assert_fail ("getOperand(0)->getType()->isFPOrFPVectorTy() && \"Invalid operand types for FCmp instruction\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1351, __PRETTY_FUNCTION__)) |
| 1351 | "Invalid operand types for FCmp instruction")((getOperand(0)->getType()->isFPOrFPVectorTy() && "Invalid operand types for FCmp instruction") ? static_cast< void> (0) : __assert_fail ("getOperand(0)->getType()->isFPOrFPVectorTy() && \"Invalid operand types for FCmp instruction\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1351, __PRETTY_FUNCTION__)); |
| 1352 | } |
| 1353 | |
| 1354 | protected: |
| 1355 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1356 | friend class Instruction; |
| 1357 | |
| 1358 | /// Clone an identical FCmpInst |
| 1359 | FCmpInst *cloneImpl() const; |
| 1360 | |
| 1361 | public: |
| 1362 | /// Constructor with insert-before-instruction semantics. |
| 1363 | FCmpInst( |
| 1364 | Instruction *InsertBefore, ///< Where to insert |
| 1365 | Predicate pred, ///< The predicate to use for the comparison |
| 1366 | Value *LHS, ///< The left-hand-side of the expression |
| 1367 | Value *RHS, ///< The right-hand-side of the expression |
| 1368 | const Twine &NameStr = "" ///< Name of the instruction |
| 1369 | ) : CmpInst(makeCmpResultType(LHS->getType()), |
| 1370 | Instruction::FCmp, pred, LHS, RHS, NameStr, |
| 1371 | InsertBefore) { |
| 1372 | AssertOK(); |
| 1373 | } |
| 1374 | |
| 1375 | /// Constructor with insert-at-end semantics. |
| 1376 | FCmpInst( |
| 1377 | BasicBlock &InsertAtEnd, ///< Block to insert into. |
| 1378 | Predicate pred, ///< The predicate to use for the comparison |
| 1379 | Value *LHS, ///< The left-hand-side of the expression |
| 1380 | Value *RHS, ///< The right-hand-side of the expression |
| 1381 | const Twine &NameStr = "" ///< Name of the instruction |
| 1382 | ) : CmpInst(makeCmpResultType(LHS->getType()), |
| 1383 | Instruction::FCmp, pred, LHS, RHS, NameStr, |
| 1384 | &InsertAtEnd) { |
| 1385 | AssertOK(); |
| 1386 | } |
| 1387 | |
| 1388 | /// Constructor with no-insertion semantics |
| 1389 | FCmpInst( |
| 1390 | Predicate Pred, ///< The predicate to use for the comparison |
| 1391 | Value *LHS, ///< The left-hand-side of the expression |
| 1392 | Value *RHS, ///< The right-hand-side of the expression |
| 1393 | const Twine &NameStr = "", ///< Name of the instruction |
| 1394 | Instruction *FlagsSource = nullptr |
| 1395 | ) : CmpInst(makeCmpResultType(LHS->getType()), Instruction::FCmp, Pred, LHS, |
| 1396 | RHS, NameStr, nullptr, FlagsSource) { |
| 1397 | AssertOK(); |
| 1398 | } |
| 1399 | |
| 1400 | /// @returns true if the predicate of this instruction is EQ or NE. |
| 1401 | /// Determine if this is an equality predicate. |
| 1402 | static bool isEquality(Predicate Pred) { |
| 1403 | return Pred == FCMP_OEQ || Pred == FCMP_ONE || Pred == FCMP_UEQ || |
| 1404 | Pred == FCMP_UNE; |
| 1405 | } |
| 1406 | |
| 1407 | /// @returns true if the predicate of this instruction is EQ or NE. |
| 1408 | /// Determine if this is an equality predicate. |
| 1409 | bool isEquality() const { return isEquality(getPredicate()); } |
| 1410 | |
| 1411 | /// @returns true if the predicate of this instruction is commutative. |
| 1412 | /// Determine if this is a commutative predicate. |
| 1413 | bool isCommutative() const { |
| 1414 | return isEquality() || |
| 1415 | getPredicate() == FCMP_FALSE || |
| 1416 | getPredicate() == FCMP_TRUE || |
| 1417 | getPredicate() == FCMP_ORD || |
| 1418 | getPredicate() == FCMP_UNO; |
| 1419 | } |
| 1420 | |
| 1421 | /// @returns true if the predicate is relational (not EQ or NE). |
| 1422 | /// Determine if this a relational predicate. |
| 1423 | bool isRelational() const { return !isEquality(); } |
| 1424 | |
| 1425 | /// Exchange the two operands to this instruction in such a way that it does |
| 1426 | /// not modify the semantics of the instruction. The predicate value may be |
| 1427 | /// changed to retain the same result if the predicate is order dependent |
| 1428 | /// (e.g. ult). |
| 1429 | /// Swap operands and adjust predicate. |
| 1430 | void swapOperands() { |
| 1431 | setPredicate(getSwappedPredicate()); |
| 1432 | Op<0>().swap(Op<1>()); |
| 1433 | } |
| 1434 | |
| 1435 | /// Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1436 | static bool classof(const Instruction *I) { |
| 1437 | return I->getOpcode() == Instruction::FCmp; |
| 1438 | } |
| 1439 | static bool classof(const Value *V) { |
| 1440 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1441 | } |
| 1442 | }; |
| 1443 | |
| 1444 | //===----------------------------------------------------------------------===// |
| 1445 | /// This class represents a function call, abstracting a target |
| 1446 | /// machine's calling convention. This class uses low bit of the SubClassData |
| 1447 | /// field to indicate whether or not this is a tail call. The rest of the bits |
| 1448 | /// hold the calling convention of the call. |
| 1449 | /// |
| 1450 | class CallInst : public CallBase { |
| 1451 | CallInst(const CallInst &CI); |
| 1452 | |
| 1453 | /// Construct a CallInst given a range of arguments. |
| 1454 | /// Construct a CallInst from a range of arguments |
| 1455 | inline CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1456 | ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr, |
| 1457 | Instruction *InsertBefore); |
| 1458 | |
| 1459 | inline CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1460 | const Twine &NameStr, Instruction *InsertBefore) |
| 1461 | : CallInst(Ty, Func, Args, None, NameStr, InsertBefore) {} |
| 1462 | |
| 1463 | /// Construct a CallInst given a range of arguments. |
| 1464 | /// Construct a CallInst from a range of arguments |
| 1465 | inline CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1466 | ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr, |
| 1467 | BasicBlock *InsertAtEnd); |
| 1468 | |
| 1469 | explicit CallInst(FunctionType *Ty, Value *F, const Twine &NameStr, |
| 1470 | Instruction *InsertBefore); |
| 1471 | |
| 1472 | CallInst(FunctionType *ty, Value *F, const Twine &NameStr, |
| 1473 | BasicBlock *InsertAtEnd); |
| 1474 | |
| 1475 | void init(FunctionType *FTy, Value *Func, ArrayRef<Value *> Args, |
| 1476 | ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr); |
| 1477 | void init(FunctionType *FTy, Value *Func, const Twine &NameStr); |
| 1478 | |
| 1479 | /// Compute the number of operands to allocate. |
| 1480 | static int ComputeNumOperands(int NumArgs, int NumBundleInputs = 0) { |
| 1481 | // We need one operand for the called function, plus the input operand |
| 1482 | // counts provided. |
| 1483 | return 1 + NumArgs + NumBundleInputs; |
| 1484 | } |
| 1485 | |
| 1486 | protected: |
| 1487 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1488 | friend class Instruction; |
| 1489 | |
| 1490 | CallInst *cloneImpl() const; |
| 1491 | |
| 1492 | public: |
| 1493 | static CallInst *Create(FunctionType *Ty, Value *F, const Twine &NameStr = "", |
| 1494 | Instruction *InsertBefore = nullptr) { |
| 1495 | return new (ComputeNumOperands(0)) CallInst(Ty, F, NameStr, InsertBefore); |
| 1496 | } |
| 1497 | |
| 1498 | static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1499 | const Twine &NameStr, |
| 1500 | Instruction *InsertBefore = nullptr) { |
| 1501 | return new (ComputeNumOperands(Args.size())) |
| 1502 | CallInst(Ty, Func, Args, None, NameStr, InsertBefore); |
| 1503 | } |
| 1504 | |
| 1505 | static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1506 | ArrayRef<OperandBundleDef> Bundles = None, |
| 1507 | const Twine &NameStr = "", |
| 1508 | Instruction *InsertBefore = nullptr) { |
| 1509 | const int NumOperands = |
| 1510 | ComputeNumOperands(Args.size(), CountBundleInputs(Bundles)); |
| 1511 | const unsigned DescriptorBytes = Bundles.size() * sizeof(BundleOpInfo); |
| 1512 | |
| 1513 | return new (NumOperands, DescriptorBytes) |
| 1514 | CallInst(Ty, Func, Args, Bundles, NameStr, InsertBefore); |
| 1515 | } |
| 1516 | |
| 1517 | static CallInst *Create(FunctionType *Ty, Value *F, const Twine &NameStr, |
| 1518 | BasicBlock *InsertAtEnd) { |
| 1519 | return new (ComputeNumOperands(0)) CallInst(Ty, F, NameStr, InsertAtEnd); |
| 1520 | } |
| 1521 | |
| 1522 | static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1523 | const Twine &NameStr, BasicBlock *InsertAtEnd) { |
| 1524 | return new (ComputeNumOperands(Args.size())) |
| 1525 | CallInst(Ty, Func, Args, None, NameStr, InsertAtEnd); |
| 1526 | } |
| 1527 | |
| 1528 | static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1529 | ArrayRef<OperandBundleDef> Bundles, |
| 1530 | const Twine &NameStr, BasicBlock *InsertAtEnd) { |
| 1531 | const int NumOperands = |
| 1532 | ComputeNumOperands(Args.size(), CountBundleInputs(Bundles)); |
| 1533 | const unsigned DescriptorBytes = Bundles.size() * sizeof(BundleOpInfo); |
| 1534 | |
| 1535 | return new (NumOperands, DescriptorBytes) |
| 1536 | CallInst(Ty, Func, Args, Bundles, NameStr, InsertAtEnd); |
| 1537 | } |
| 1538 | |
| 1539 | static CallInst *Create(FunctionCallee Func, const Twine &NameStr = "", |
| 1540 | Instruction *InsertBefore = nullptr) { |
| 1541 | return Create(Func.getFunctionType(), Func.getCallee(), NameStr, |
| 1542 | InsertBefore); |
| 1543 | } |
| 1544 | |
| 1545 | static CallInst *Create(FunctionCallee Func, ArrayRef<Value *> Args, |
| 1546 | ArrayRef<OperandBundleDef> Bundles = None, |
| 1547 | const Twine &NameStr = "", |
| 1548 | Instruction *InsertBefore = nullptr) { |
| 1549 | return Create(Func.getFunctionType(), Func.getCallee(), Args, Bundles, |
| 1550 | NameStr, InsertBefore); |
| 1551 | } |
| 1552 | |
| 1553 | static CallInst *Create(FunctionCallee Func, ArrayRef<Value *> Args, |
| 1554 | const Twine &NameStr, |
| 1555 | Instruction *InsertBefore = nullptr) { |
| 1556 | return Create(Func.getFunctionType(), Func.getCallee(), Args, NameStr, |
| 1557 | InsertBefore); |
| 1558 | } |
| 1559 | |
| 1560 | static CallInst *Create(FunctionCallee Func, const Twine &NameStr, |
| 1561 | BasicBlock *InsertAtEnd) { |
| 1562 | return Create(Func.getFunctionType(), Func.getCallee(), NameStr, |
| 1563 | InsertAtEnd); |
| 1564 | } |
| 1565 | |
| 1566 | static CallInst *Create(FunctionCallee Func, ArrayRef<Value *> Args, |
| 1567 | const Twine &NameStr, BasicBlock *InsertAtEnd) { |
| 1568 | return Create(Func.getFunctionType(), Func.getCallee(), Args, NameStr, |
| 1569 | InsertAtEnd); |
| 1570 | } |
| 1571 | |
| 1572 | static CallInst *Create(FunctionCallee Func, ArrayRef<Value *> Args, |
| 1573 | ArrayRef<OperandBundleDef> Bundles, |
| 1574 | const Twine &NameStr, BasicBlock *InsertAtEnd) { |
| 1575 | return Create(Func.getFunctionType(), Func.getCallee(), Args, Bundles, |
| 1576 | NameStr, InsertAtEnd); |
| 1577 | } |
| 1578 | |
| 1579 | /// Create a clone of \p CI with a different set of operand bundles and |
| 1580 | /// insert it before \p InsertPt. |
| 1581 | /// |
| 1582 | /// The returned call instruction is identical \p CI in every way except that |
| 1583 | /// the operand bundles for the new instruction are set to the operand bundles |
| 1584 | /// in \p Bundles. |
| 1585 | static CallInst *Create(CallInst *CI, ArrayRef<OperandBundleDef> Bundles, |
| 1586 | Instruction *InsertPt = nullptr); |
| 1587 | |
| 1588 | /// Generate the IR for a call to malloc: |
| 1589 | /// 1. Compute the malloc call's argument as the specified type's size, |
| 1590 | /// possibly multiplied by the array size if the array size is not |
| 1591 | /// constant 1. |
| 1592 | /// 2. Call malloc with that argument. |
| 1593 | /// 3. Bitcast the result of the malloc call to the specified type. |
| 1594 | static Instruction *CreateMalloc(Instruction *InsertBefore, Type *IntPtrTy, |
| 1595 | Type *AllocTy, Value *AllocSize, |
| 1596 | Value *ArraySize = nullptr, |
| 1597 | Function *MallocF = nullptr, |
| 1598 | const Twine &Name = ""); |
| 1599 | static Instruction *CreateMalloc(BasicBlock *InsertAtEnd, Type *IntPtrTy, |
| 1600 | Type *AllocTy, Value *AllocSize, |
| 1601 | Value *ArraySize = nullptr, |
| 1602 | Function *MallocF = nullptr, |
| 1603 | const Twine &Name = ""); |
| 1604 | static Instruction *CreateMalloc(Instruction *InsertBefore, Type *IntPtrTy, |
| 1605 | Type *AllocTy, Value *AllocSize, |
| 1606 | Value *ArraySize = nullptr, |
| 1607 | ArrayRef<OperandBundleDef> Bundles = None, |
| 1608 | Function *MallocF = nullptr, |
| 1609 | const Twine &Name = ""); |
| 1610 | static Instruction *CreateMalloc(BasicBlock *InsertAtEnd, Type *IntPtrTy, |
| 1611 | Type *AllocTy, Value *AllocSize, |
| 1612 | Value *ArraySize = nullptr, |
| 1613 | ArrayRef<OperandBundleDef> Bundles = None, |
| 1614 | Function *MallocF = nullptr, |
| 1615 | const Twine &Name = ""); |
| 1616 | /// Generate the IR for a call to the builtin free function. |
| 1617 | static Instruction *CreateFree(Value *Source, Instruction *InsertBefore); |
| 1618 | static Instruction *CreateFree(Value *Source, BasicBlock *InsertAtEnd); |
| 1619 | static Instruction *CreateFree(Value *Source, |
| 1620 | ArrayRef<OperandBundleDef> Bundles, |
| 1621 | Instruction *InsertBefore); |
| 1622 | static Instruction *CreateFree(Value *Source, |
| 1623 | ArrayRef<OperandBundleDef> Bundles, |
| 1624 | BasicBlock *InsertAtEnd); |
| 1625 | |
| 1626 | // Note that 'musttail' implies 'tail'. |
| 1627 | enum TailCallKind : unsigned { |
| 1628 | TCK_None = 0, |
| 1629 | TCK_Tail = 1, |
| 1630 | TCK_MustTail = 2, |
| 1631 | TCK_NoTail = 3, |
| 1632 | TCK_LAST = TCK_NoTail |
| 1633 | }; |
| 1634 | |
| 1635 | using TailCallKindField = Bitfield::Element<TailCallKind, 0, 2, TCK_LAST>; |
| 1636 | static_assert( |
| 1637 | Bitfield::areContiguous<TailCallKindField, CallBase::CallingConvField>(), |
| 1638 | "Bitfields must be contiguous"); |
| 1639 | |
| 1640 | TailCallKind getTailCallKind() const { |
| 1641 | return getSubclassData<TailCallKindField>(); |
| 1642 | } |
| 1643 | |
| 1644 | bool isTailCall() const { |
| 1645 | TailCallKind Kind = getTailCallKind(); |
| 1646 | return Kind == TCK_Tail || Kind == TCK_MustTail; |
| 1647 | } |
| 1648 | |
| 1649 | bool isMustTailCall() const { return getTailCallKind() == TCK_MustTail; } |
| 1650 | |
| 1651 | bool isNoTailCall() const { return getTailCallKind() == TCK_NoTail; } |
| 1652 | |
| 1653 | void setTailCallKind(TailCallKind TCK) { |
| 1654 | setSubclassData<TailCallKindField>(TCK); |
| 1655 | } |
| 1656 | |
| 1657 | void setTailCall(bool IsTc = true) { |
| 1658 | setTailCallKind(IsTc ? TCK_Tail : TCK_None); |
| 1659 | } |
| 1660 | |
| 1661 | /// Return true if the call can return twice |
| 1662 | bool canReturnTwice() const { return hasFnAttr(Attribute::ReturnsTwice); } |
| 1663 | void setCanReturnTwice() { |
| 1664 | addAttribute(AttributeList::FunctionIndex, Attribute::ReturnsTwice); |
| 1665 | } |
| 1666 | |
| 1667 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1668 | static bool classof(const Instruction *I) { |
| 1669 | return I->getOpcode() == Instruction::Call; |
| 1670 | } |
| 1671 | static bool classof(const Value *V) { |
| 1672 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1673 | } |
| 1674 | |
| 1675 | /// Updates profile metadata by scaling it by \p S / \p T. |
| 1676 | void updateProfWeight(uint64_t S, uint64_t T); |
| 1677 | |
| 1678 | private: |
| 1679 | // Shadow Instruction::setInstructionSubclassData with a private forwarding |
| 1680 | // method so that subclasses cannot accidentally use it. |
| 1681 | template <typename Bitfield> |
| 1682 | void setSubclassData(typename Bitfield::Type Value) { |
| 1683 | Instruction::setSubclassData<Bitfield>(Value); |
| 1684 | } |
| 1685 | }; |
| 1686 | |
| 1687 | CallInst::CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1688 | ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr, |
| 1689 | BasicBlock *InsertAtEnd) |
| 1690 | : CallBase(Ty->getReturnType(), Instruction::Call, |
| 1691 | OperandTraits<CallBase>::op_end(this) - |
| 1692 | (Args.size() + CountBundleInputs(Bundles) + 1), |
| 1693 | unsigned(Args.size() + CountBundleInputs(Bundles) + 1), |
| 1694 | InsertAtEnd) { |
| 1695 | init(Ty, Func, Args, Bundles, NameStr); |
| 1696 | } |
| 1697 | |
| 1698 | CallInst::CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args, |
| 1699 | ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr, |
| 1700 | Instruction *InsertBefore) |
| 1701 | : CallBase(Ty->getReturnType(), Instruction::Call, |
| 1702 | OperandTraits<CallBase>::op_end(this) - |
| 1703 | (Args.size() + CountBundleInputs(Bundles) + 1), |
| 1704 | unsigned(Args.size() + CountBundleInputs(Bundles) + 1), |
| 1705 | InsertBefore) { |
| 1706 | init(Ty, Func, Args, Bundles, NameStr); |
| 1707 | } |
| 1708 | |
| 1709 | //===----------------------------------------------------------------------===// |
| 1710 | // SelectInst Class |
| 1711 | //===----------------------------------------------------------------------===// |
| 1712 | |
| 1713 | /// This class represents the LLVM 'select' instruction. |
| 1714 | /// |
| 1715 | class SelectInst : public Instruction { |
| 1716 | SelectInst(Value *C, Value *S1, Value *S2, const Twine &NameStr, |
| 1717 | Instruction *InsertBefore) |
| 1718 | : Instruction(S1->getType(), Instruction::Select, |
| 1719 | &Op<0>(), 3, InsertBefore) { |
| 1720 | init(C, S1, S2); |
| 1721 | setName(NameStr); |
| 1722 | } |
| 1723 | |
| 1724 | SelectInst(Value *C, Value *S1, Value *S2, const Twine &NameStr, |
| 1725 | BasicBlock *InsertAtEnd) |
| 1726 | : Instruction(S1->getType(), Instruction::Select, |
| 1727 | &Op<0>(), 3, InsertAtEnd) { |
| 1728 | init(C, S1, S2); |
| 1729 | setName(NameStr); |
| 1730 | } |
| 1731 | |
| 1732 | void init(Value *C, Value *S1, Value *S2) { |
| 1733 | assert(!areInvalidOperands(C, S1, S2) && "Invalid operands for select")((!areInvalidOperands(C, S1, S2) && "Invalid operands for select" ) ? static_cast<void> (0) : __assert_fail ("!areInvalidOperands(C, S1, S2) && \"Invalid operands for select\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1733, __PRETTY_FUNCTION__)); |
| 1734 | Op<0>() = C; |
| 1735 | Op<1>() = S1; |
| 1736 | Op<2>() = S2; |
| 1737 | } |
| 1738 | |
| 1739 | protected: |
| 1740 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1741 | friend class Instruction; |
| 1742 | |
| 1743 | SelectInst *cloneImpl() const; |
| 1744 | |
| 1745 | public: |
| 1746 | static SelectInst *Create(Value *C, Value *S1, Value *S2, |
| 1747 | const Twine &NameStr = "", |
| 1748 | Instruction *InsertBefore = nullptr, |
| 1749 | Instruction *MDFrom = nullptr) { |
| 1750 | SelectInst *Sel = new(3) SelectInst(C, S1, S2, NameStr, InsertBefore); |
| 1751 | if (MDFrom) |
| 1752 | Sel->copyMetadata(*MDFrom); |
| 1753 | return Sel; |
| 1754 | } |
| 1755 | |
| 1756 | static SelectInst *Create(Value *C, Value *S1, Value *S2, |
| 1757 | const Twine &NameStr, |
| 1758 | BasicBlock *InsertAtEnd) { |
| 1759 | return new(3) SelectInst(C, S1, S2, NameStr, InsertAtEnd); |
| 1760 | } |
| 1761 | |
| 1762 | const Value *getCondition() const { return Op<0>(); } |
| 1763 | const Value *getTrueValue() const { return Op<1>(); } |
| 1764 | const Value *getFalseValue() const { return Op<2>(); } |
| 1765 | Value *getCondition() { return Op<0>(); } |
| 1766 | Value *getTrueValue() { return Op<1>(); } |
| 1767 | Value *getFalseValue() { return Op<2>(); } |
| 1768 | |
| 1769 | void setCondition(Value *V) { Op<0>() = V; } |
| 1770 | void setTrueValue(Value *V) { Op<1>() = V; } |
| 1771 | void setFalseValue(Value *V) { Op<2>() = V; } |
| 1772 | |
| 1773 | /// Swap the true and false values of the select instruction. |
| 1774 | /// This doesn't swap prof metadata. |
| 1775 | void swapValues() { Op<1>().swap(Op<2>()); } |
| 1776 | |
| 1777 | /// Return a string if the specified operands are invalid |
| 1778 | /// for a select operation, otherwise return null. |
| 1779 | static const char *areInvalidOperands(Value *Cond, Value *True, Value *False); |
| 1780 | |
| 1781 | /// Transparently provide more efficient getOperand methods. |
| 1782 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 1783 | |
| 1784 | OtherOps getOpcode() const { |
| 1785 | return static_cast<OtherOps>(Instruction::getOpcode()); |
| 1786 | } |
| 1787 | |
| 1788 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1789 | static bool classof(const Instruction *I) { |
| 1790 | return I->getOpcode() == Instruction::Select; |
| 1791 | } |
| 1792 | static bool classof(const Value *V) { |
| 1793 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1794 | } |
| 1795 | }; |
| 1796 | |
| 1797 | template <> |
| 1798 | struct OperandTraits<SelectInst> : public FixedNumOperandTraits<SelectInst, 3> { |
| 1799 | }; |
| 1800 | |
| 1801 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(SelectInst, Value)SelectInst::op_iterator SelectInst::op_begin() { return OperandTraits <SelectInst>::op_begin(this); } SelectInst::const_op_iterator SelectInst::op_begin() const { return OperandTraits<SelectInst >::op_begin(const_cast<SelectInst*>(this)); } SelectInst ::op_iterator SelectInst::op_end() { return OperandTraits< SelectInst>::op_end(this); } SelectInst::const_op_iterator SelectInst::op_end() const { return OperandTraits<SelectInst >::op_end(const_cast<SelectInst*>(this)); } Value *SelectInst ::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<SelectInst>::operands(this) && "getOperand() out of range!" ) ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<SelectInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1801, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<SelectInst>::op_begin(const_cast<SelectInst *>(this))[i_nocapture].get()); } void SelectInst::setOperand (unsigned i_nocapture, Value *Val_nocapture) { ((i_nocapture < OperandTraits<SelectInst>::operands(this) && "setOperand() out of range!" ) ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<SelectInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1801, __PRETTY_FUNCTION__)); OperandTraits<SelectInst> ::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned SelectInst ::getNumOperands() const { return OperandTraits<SelectInst >::operands(this); } template <int Idx_nocapture> Use &SelectInst::Op() { return this->OpFrom<Idx_nocapture >(this); } template <int Idx_nocapture> const Use & SelectInst::Op() const { return this->OpFrom<Idx_nocapture >(this); } |
| 1802 | |
| 1803 | //===----------------------------------------------------------------------===// |
| 1804 | // VAArgInst Class |
| 1805 | //===----------------------------------------------------------------------===// |
| 1806 | |
| 1807 | /// This class represents the va_arg llvm instruction, which returns |
| 1808 | /// an argument of the specified type given a va_list and increments that list |
| 1809 | /// |
| 1810 | class VAArgInst : public UnaryInstruction { |
| 1811 | protected: |
| 1812 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1813 | friend class Instruction; |
| 1814 | |
| 1815 | VAArgInst *cloneImpl() const; |
| 1816 | |
| 1817 | public: |
| 1818 | VAArgInst(Value *List, Type *Ty, const Twine &NameStr = "", |
| 1819 | Instruction *InsertBefore = nullptr) |
| 1820 | : UnaryInstruction(Ty, VAArg, List, InsertBefore) { |
| 1821 | setName(NameStr); |
| 1822 | } |
| 1823 | |
| 1824 | VAArgInst(Value *List, Type *Ty, const Twine &NameStr, |
| 1825 | BasicBlock *InsertAtEnd) |
| 1826 | : UnaryInstruction(Ty, VAArg, List, InsertAtEnd) { |
| 1827 | setName(NameStr); |
| 1828 | } |
| 1829 | |
| 1830 | Value *getPointerOperand() { return getOperand(0); } |
| 1831 | const Value *getPointerOperand() const { return getOperand(0); } |
| 1832 | static unsigned getPointerOperandIndex() { return 0U; } |
| 1833 | |
| 1834 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1835 | static bool classof(const Instruction *I) { |
| 1836 | return I->getOpcode() == VAArg; |
| 1837 | } |
| 1838 | static bool classof(const Value *V) { |
| 1839 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1840 | } |
| 1841 | }; |
| 1842 | |
| 1843 | //===----------------------------------------------------------------------===// |
| 1844 | // ExtractElementInst Class |
| 1845 | //===----------------------------------------------------------------------===// |
| 1846 | |
| 1847 | /// This instruction extracts a single (scalar) |
| 1848 | /// element from a VectorType value |
| 1849 | /// |
| 1850 | class ExtractElementInst : public Instruction { |
| 1851 | ExtractElementInst(Value *Vec, Value *Idx, const Twine &NameStr = "", |
| 1852 | Instruction *InsertBefore = nullptr); |
| 1853 | ExtractElementInst(Value *Vec, Value *Idx, const Twine &NameStr, |
| 1854 | BasicBlock *InsertAtEnd); |
| 1855 | |
| 1856 | protected: |
| 1857 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1858 | friend class Instruction; |
| 1859 | |
| 1860 | ExtractElementInst *cloneImpl() const; |
| 1861 | |
| 1862 | public: |
| 1863 | static ExtractElementInst *Create(Value *Vec, Value *Idx, |
| 1864 | const Twine &NameStr = "", |
| 1865 | Instruction *InsertBefore = nullptr) { |
| 1866 | return new(2) ExtractElementInst(Vec, Idx, NameStr, InsertBefore); |
| 1867 | } |
| 1868 | |
| 1869 | static ExtractElementInst *Create(Value *Vec, Value *Idx, |
| 1870 | const Twine &NameStr, |
| 1871 | BasicBlock *InsertAtEnd) { |
| 1872 | return new(2) ExtractElementInst(Vec, Idx, NameStr, InsertAtEnd); |
| 1873 | } |
| 1874 | |
| 1875 | /// Return true if an extractelement instruction can be |
| 1876 | /// formed with the specified operands. |
| 1877 | static bool isValidOperands(const Value *Vec, const Value *Idx); |
| 1878 | |
| 1879 | Value *getVectorOperand() { return Op<0>(); } |
| 1880 | Value *getIndexOperand() { return Op<1>(); } |
| 1881 | const Value *getVectorOperand() const { return Op<0>(); } |
| 1882 | const Value *getIndexOperand() const { return Op<1>(); } |
| 1883 | |
| 1884 | VectorType *getVectorOperandType() const { |
| 1885 | return cast<VectorType>(getVectorOperand()->getType()); |
| 1886 | } |
| 1887 | |
| 1888 | /// Transparently provide more efficient getOperand methods. |
| 1889 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 1890 | |
| 1891 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1892 | static bool classof(const Instruction *I) { |
| 1893 | return I->getOpcode() == Instruction::ExtractElement; |
| 1894 | } |
| 1895 | static bool classof(const Value *V) { |
| 1896 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1897 | } |
| 1898 | }; |
| 1899 | |
| 1900 | template <> |
| 1901 | struct OperandTraits<ExtractElementInst> : |
| 1902 | public FixedNumOperandTraits<ExtractElementInst, 2> { |
| 1903 | }; |
| 1904 | |
| 1905 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ExtractElementInst, Value)ExtractElementInst::op_iterator ExtractElementInst::op_begin( ) { return OperandTraits<ExtractElementInst>::op_begin( this); } ExtractElementInst::const_op_iterator ExtractElementInst ::op_begin() const { return OperandTraits<ExtractElementInst >::op_begin(const_cast<ExtractElementInst*>(this)); } ExtractElementInst::op_iterator ExtractElementInst::op_end() { return OperandTraits<ExtractElementInst>::op_end(this ); } ExtractElementInst::const_op_iterator ExtractElementInst ::op_end() const { return OperandTraits<ExtractElementInst >::op_end(const_cast<ExtractElementInst*>(this)); } Value *ExtractElementInst::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<ExtractElementInst>:: operands(this) && "getOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<ExtractElementInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1905, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<ExtractElementInst>::op_begin(const_cast <ExtractElementInst*>(this))[i_nocapture].get()); } void ExtractElementInst::setOperand(unsigned i_nocapture, Value * Val_nocapture) { ((i_nocapture < OperandTraits<ExtractElementInst >::operands(this) && "setOperand() out of range!") ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<ExtractElementInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1905, __PRETTY_FUNCTION__)); OperandTraits<ExtractElementInst >::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned ExtractElementInst::getNumOperands() const { return OperandTraits <ExtractElementInst>::operands(this); } template <int Idx_nocapture> Use &ExtractElementInst::Op() { return this->OpFrom<Idx_nocapture>(this); } template <int Idx_nocapture> const Use &ExtractElementInst::Op() const { return this->OpFrom<Idx_nocapture>(this); } |
| 1906 | |
| 1907 | //===----------------------------------------------------------------------===// |
| 1908 | // InsertElementInst Class |
| 1909 | //===----------------------------------------------------------------------===// |
| 1910 | |
| 1911 | /// This instruction inserts a single (scalar) |
| 1912 | /// element into a VectorType value |
| 1913 | /// |
| 1914 | class InsertElementInst : public Instruction { |
| 1915 | InsertElementInst(Value *Vec, Value *NewElt, Value *Idx, |
| 1916 | const Twine &NameStr = "", |
| 1917 | Instruction *InsertBefore = nullptr); |
| 1918 | InsertElementInst(Value *Vec, Value *NewElt, Value *Idx, const Twine &NameStr, |
| 1919 | BasicBlock *InsertAtEnd); |
| 1920 | |
| 1921 | protected: |
| 1922 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1923 | friend class Instruction; |
| 1924 | |
| 1925 | InsertElementInst *cloneImpl() const; |
| 1926 | |
| 1927 | public: |
| 1928 | static InsertElementInst *Create(Value *Vec, Value *NewElt, Value *Idx, |
| 1929 | const Twine &NameStr = "", |
| 1930 | Instruction *InsertBefore = nullptr) { |
| 1931 | return new(3) InsertElementInst(Vec, NewElt, Idx, NameStr, InsertBefore); |
| 1932 | } |
| 1933 | |
| 1934 | static InsertElementInst *Create(Value *Vec, Value *NewElt, Value *Idx, |
| 1935 | const Twine &NameStr, |
| 1936 | BasicBlock *InsertAtEnd) { |
| 1937 | return new(3) InsertElementInst(Vec, NewElt, Idx, NameStr, InsertAtEnd); |
| 1938 | } |
| 1939 | |
| 1940 | /// Return true if an insertelement instruction can be |
| 1941 | /// formed with the specified operands. |
| 1942 | static bool isValidOperands(const Value *Vec, const Value *NewElt, |
| 1943 | const Value *Idx); |
| 1944 | |
| 1945 | /// Overload to return most specific vector type. |
| 1946 | /// |
| 1947 | VectorType *getType() const { |
| 1948 | return cast<VectorType>(Instruction::getType()); |
| 1949 | } |
| 1950 | |
| 1951 | /// Transparently provide more efficient getOperand methods. |
| 1952 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 1953 | |
| 1954 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 1955 | static bool classof(const Instruction *I) { |
| 1956 | return I->getOpcode() == Instruction::InsertElement; |
| 1957 | } |
| 1958 | static bool classof(const Value *V) { |
| 1959 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 1960 | } |
| 1961 | }; |
| 1962 | |
| 1963 | template <> |
| 1964 | struct OperandTraits<InsertElementInst> : |
| 1965 | public FixedNumOperandTraits<InsertElementInst, 3> { |
| 1966 | }; |
| 1967 | |
| 1968 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(InsertElementInst, Value)InsertElementInst::op_iterator InsertElementInst::op_begin() { return OperandTraits<InsertElementInst>::op_begin(this ); } InsertElementInst::const_op_iterator InsertElementInst:: op_begin() const { return OperandTraits<InsertElementInst> ::op_begin(const_cast<InsertElementInst*>(this)); } InsertElementInst ::op_iterator InsertElementInst::op_end() { return OperandTraits <InsertElementInst>::op_end(this); } InsertElementInst:: const_op_iterator InsertElementInst::op_end() const { return OperandTraits <InsertElementInst>::op_end(const_cast<InsertElementInst *>(this)); } Value *InsertElementInst::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<InsertElementInst >::operands(this) && "getOperand() out of range!") ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<InsertElementInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1968, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<InsertElementInst>::op_begin(const_cast <InsertElementInst*>(this))[i_nocapture].get()); } void InsertElementInst::setOperand(unsigned i_nocapture, Value *Val_nocapture ) { ((i_nocapture < OperandTraits<InsertElementInst> ::operands(this) && "setOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<InsertElementInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 1968, __PRETTY_FUNCTION__)); OperandTraits<InsertElementInst >::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned InsertElementInst::getNumOperands() const { return OperandTraits <InsertElementInst>::operands(this); } template <int Idx_nocapture> Use &InsertElementInst::Op() { return this ->OpFrom<Idx_nocapture>(this); } template <int Idx_nocapture > const Use &InsertElementInst::Op() const { return this ->OpFrom<Idx_nocapture>(this); } |
| 1969 | |
| 1970 | //===----------------------------------------------------------------------===// |
| 1971 | // ShuffleVectorInst Class |
| 1972 | //===----------------------------------------------------------------------===// |
| 1973 | |
| 1974 | constexpr int UndefMaskElem = -1; |
| 1975 | |
| 1976 | /// This instruction constructs a fixed permutation of two |
| 1977 | /// input vectors. |
| 1978 | /// |
| 1979 | /// For each element of the result vector, the shuffle mask selects an element |
| 1980 | /// from one of the input vectors to copy to the result. Non-negative elements |
| 1981 | /// in the mask represent an index into the concatenated pair of input vectors. |
| 1982 | /// UndefMaskElem (-1) specifies that the result element is undefined. |
| 1983 | /// |
| 1984 | /// For scalable vectors, all the elements of the mask must be 0 or -1. This |
| 1985 | /// requirement may be relaxed in the future. |
| 1986 | class ShuffleVectorInst : public Instruction { |
| 1987 | SmallVector<int, 4> ShuffleMask; |
| 1988 | Constant *ShuffleMaskForBitcode; |
| 1989 | |
| 1990 | protected: |
| 1991 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 1992 | friend class Instruction; |
| 1993 | |
| 1994 | ShuffleVectorInst *cloneImpl() const; |
| 1995 | |
| 1996 | public: |
| 1997 | ShuffleVectorInst(Value *V1, Value *V2, Value *Mask, |
| 1998 | const Twine &NameStr = "", |
| 1999 | Instruction *InsertBefor = nullptr); |
| 2000 | ShuffleVectorInst(Value *V1, Value *V2, Value *Mask, |
| 2001 | const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 2002 | ShuffleVectorInst(Value *V1, Value *V2, ArrayRef<int> Mask, |
| 2003 | const Twine &NameStr = "", |
| 2004 | Instruction *InsertBefor = nullptr); |
| 2005 | ShuffleVectorInst(Value *V1, Value *V2, ArrayRef<int> Mask, |
| 2006 | const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 2007 | |
| 2008 | void *operator new(size_t s) { return User::operator new(s, 2); } |
| 2009 | |
| 2010 | /// Swap the operands and adjust the mask to preserve the semantics |
| 2011 | /// of the instruction. |
| 2012 | void commute(); |
| 2013 | |
| 2014 | /// Return true if a shufflevector instruction can be |
| 2015 | /// formed with the specified operands. |
| 2016 | static bool isValidOperands(const Value *V1, const Value *V2, |
| 2017 | const Value *Mask); |
| 2018 | static bool isValidOperands(const Value *V1, const Value *V2, |
| 2019 | ArrayRef<int> Mask); |
| 2020 | |
| 2021 | /// Overload to return most specific vector type. |
| 2022 | /// |
| 2023 | VectorType *getType() const { |
| 2024 | return cast<VectorType>(Instruction::getType()); |
| 2025 | } |
| 2026 | |
| 2027 | /// Transparently provide more efficient getOperand methods. |
| 2028 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 2029 | |
| 2030 | /// Return the shuffle mask value of this instruction for the given element |
| 2031 | /// index. Return UndefMaskElem if the element is undef. |
| 2032 | int getMaskValue(unsigned Elt) const { return ShuffleMask[Elt]; } |
| 2033 | |
| 2034 | /// Convert the input shuffle mask operand to a vector of integers. Undefined |
| 2035 | /// elements of the mask are returned as UndefMaskElem. |
| 2036 | static void getShuffleMask(const Constant *Mask, |
| 2037 | SmallVectorImpl<int> &Result); |
| 2038 | |
| 2039 | /// Return the mask for this instruction as a vector of integers. Undefined |
| 2040 | /// elements of the mask are returned as UndefMaskElem. |
| 2041 | void getShuffleMask(SmallVectorImpl<int> &Result) const { |
| 2042 | Result.assign(ShuffleMask.begin(), ShuffleMask.end()); |
| 2043 | } |
| 2044 | |
| 2045 | /// Return the mask for this instruction, for use in bitcode. |
| 2046 | /// |
| 2047 | /// TODO: This is temporary until we decide a new bitcode encoding for |
| 2048 | /// shufflevector. |
| 2049 | Constant *getShuffleMaskForBitcode() const { return ShuffleMaskForBitcode; } |
| 2050 | |
| 2051 | static Constant *convertShuffleMaskForBitcode(ArrayRef<int> Mask, |
| 2052 | Type *ResultTy); |
| 2053 | |
| 2054 | void setShuffleMask(ArrayRef<int> Mask); |
| 2055 | |
| 2056 | ArrayRef<int> getShuffleMask() const { return ShuffleMask; } |
| 2057 | |
| 2058 | /// Return true if this shuffle returns a vector with a different number of |
| 2059 | /// elements than its source vectors. |
| 2060 | /// Examples: shufflevector <4 x n> A, <4 x n> B, <1,2,3> |
| 2061 | /// shufflevector <4 x n> A, <4 x n> B, <1,2,3,4,5> |
| 2062 | bool changesLength() const { |
| 2063 | unsigned NumSourceElts = cast<VectorType>(Op<0>()->getType()) |
| 2064 | ->getElementCount() |
| 2065 | .getKnownMinValue(); |
| 2066 | unsigned NumMaskElts = ShuffleMask.size(); |
| 2067 | return NumSourceElts != NumMaskElts; |
| 2068 | } |
| 2069 | |
| 2070 | /// Return true if this shuffle returns a vector with a greater number of |
| 2071 | /// elements than its source vectors. |
| 2072 | /// Example: shufflevector <2 x n> A, <2 x n> B, <1,2,3> |
| 2073 | bool increasesLength() const { |
| 2074 | unsigned NumSourceElts = cast<VectorType>(Op<0>()->getType()) |
| 2075 | ->getElementCount() |
| 2076 | .getKnownMinValue(); |
| 2077 | unsigned NumMaskElts = ShuffleMask.size(); |
| 2078 | return NumSourceElts < NumMaskElts; |
| 2079 | } |
| 2080 | |
| 2081 | /// Return true if this shuffle mask chooses elements from exactly one source |
| 2082 | /// vector. |
| 2083 | /// Example: <7,5,undef,7> |
| 2084 | /// This assumes that vector operands are the same length as the mask. |
| 2085 | static bool isSingleSourceMask(ArrayRef<int> Mask); |
| 2086 | static bool isSingleSourceMask(const Constant *Mask) { |
| 2087 | assert(Mask->getType()->isVectorTy() && "Shuffle needs vector constant.")((Mask->getType()->isVectorTy() && "Shuffle needs vector constant." ) ? static_cast<void> (0) : __assert_fail ("Mask->getType()->isVectorTy() && \"Shuffle needs vector constant.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2087, __PRETTY_FUNCTION__)); |
| 2088 | SmallVector<int, 16> MaskAsInts; |
| 2089 | getShuffleMask(Mask, MaskAsInts); |
| 2090 | return isSingleSourceMask(MaskAsInts); |
| 2091 | } |
| 2092 | |
| 2093 | /// Return true if this shuffle chooses elements from exactly one source |
| 2094 | /// vector without changing the length of that vector. |
| 2095 | /// Example: shufflevector <4 x n> A, <4 x n> B, <3,0,undef,3> |
| 2096 | /// TODO: Optionally allow length-changing shuffles. |
| 2097 | bool isSingleSource() const { |
| 2098 | return !changesLength() && isSingleSourceMask(ShuffleMask); |
| 2099 | } |
| 2100 | |
| 2101 | /// Return true if this shuffle mask chooses elements from exactly one source |
| 2102 | /// vector without lane crossings. A shuffle using this mask is not |
| 2103 | /// necessarily a no-op because it may change the number of elements from its |
| 2104 | /// input vectors or it may provide demanded bits knowledge via undef lanes. |
| 2105 | /// Example: <undef,undef,2,3> |
| 2106 | static bool isIdentityMask(ArrayRef<int> Mask); |
| 2107 | static bool isIdentityMask(const Constant *Mask) { |
| 2108 | assert(Mask->getType()->isVectorTy() && "Shuffle needs vector constant.")((Mask->getType()->isVectorTy() && "Shuffle needs vector constant." ) ? static_cast<void> (0) : __assert_fail ("Mask->getType()->isVectorTy() && \"Shuffle needs vector constant.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2108, __PRETTY_FUNCTION__)); |
| 2109 | SmallVector<int, 16> MaskAsInts; |
| 2110 | getShuffleMask(Mask, MaskAsInts); |
| 2111 | return isIdentityMask(MaskAsInts); |
| 2112 | } |
| 2113 | |
| 2114 | /// Return true if this shuffle chooses elements from exactly one source |
| 2115 | /// vector without lane crossings and does not change the number of elements |
| 2116 | /// from its input vectors. |
| 2117 | /// Example: shufflevector <4 x n> A, <4 x n> B, <4,undef,6,undef> |
| 2118 | bool isIdentity() const { |
| 2119 | return !changesLength() && isIdentityMask(ShuffleMask); |
| 2120 | } |
| 2121 | |
| 2122 | /// Return true if this shuffle lengthens exactly one source vector with |
| 2123 | /// undefs in the high elements. |
| 2124 | bool isIdentityWithPadding() const; |
| 2125 | |
| 2126 | /// Return true if this shuffle extracts the first N elements of exactly one |
| 2127 | /// source vector. |
| 2128 | bool isIdentityWithExtract() const; |
| 2129 | |
| 2130 | /// Return true if this shuffle concatenates its 2 source vectors. This |
| 2131 | /// returns false if either input is undefined. In that case, the shuffle is |
| 2132 | /// is better classified as an identity with padding operation. |
| 2133 | bool isConcat() const; |
| 2134 | |
| 2135 | /// Return true if this shuffle mask chooses elements from its source vectors |
| 2136 | /// without lane crossings. A shuffle using this mask would be |
| 2137 | /// equivalent to a vector select with a constant condition operand. |
| 2138 | /// Example: <4,1,6,undef> |
| 2139 | /// This returns false if the mask does not choose from both input vectors. |
| 2140 | /// In that case, the shuffle is better classified as an identity shuffle. |
| 2141 | /// This assumes that vector operands are the same length as the mask |
| 2142 | /// (a length-changing shuffle can never be equivalent to a vector select). |
| 2143 | static bool isSelectMask(ArrayRef<int> Mask); |
| 2144 | static bool isSelectMask(const Constant *Mask) { |
| 2145 | assert(Mask->getType()->isVectorTy() && "Shuffle needs vector constant.")((Mask->getType()->isVectorTy() && "Shuffle needs vector constant." ) ? static_cast<void> (0) : __assert_fail ("Mask->getType()->isVectorTy() && \"Shuffle needs vector constant.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2145, __PRETTY_FUNCTION__)); |
| 2146 | SmallVector<int, 16> MaskAsInts; |
| 2147 | getShuffleMask(Mask, MaskAsInts); |
| 2148 | return isSelectMask(MaskAsInts); |
| 2149 | } |
| 2150 | |
| 2151 | /// Return true if this shuffle chooses elements from its source vectors |
| 2152 | /// without lane crossings and all operands have the same number of elements. |
| 2153 | /// In other words, this shuffle is equivalent to a vector select with a |
| 2154 | /// constant condition operand. |
| 2155 | /// Example: shufflevector <4 x n> A, <4 x n> B, <undef,1,6,3> |
| 2156 | /// This returns false if the mask does not choose from both input vectors. |
| 2157 | /// In that case, the shuffle is better classified as an identity shuffle. |
| 2158 | /// TODO: Optionally allow length-changing shuffles. |
| 2159 | bool isSelect() const { |
| 2160 | return !changesLength() && isSelectMask(ShuffleMask); |
| 2161 | } |
| 2162 | |
| 2163 | /// Return true if this shuffle mask swaps the order of elements from exactly |
| 2164 | /// one source vector. |
| 2165 | /// Example: <7,6,undef,4> |
| 2166 | /// This assumes that vector operands are the same length as the mask. |
| 2167 | static bool isReverseMask(ArrayRef<int> Mask); |
| 2168 | static bool isReverseMask(const Constant *Mask) { |
| 2169 | assert(Mask->getType()->isVectorTy() && "Shuffle needs vector constant.")((Mask->getType()->isVectorTy() && "Shuffle needs vector constant." ) ? static_cast<void> (0) : __assert_fail ("Mask->getType()->isVectorTy() && \"Shuffle needs vector constant.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2169, __PRETTY_FUNCTION__)); |
| 2170 | SmallVector<int, 16> MaskAsInts; |
| 2171 | getShuffleMask(Mask, MaskAsInts); |
| 2172 | return isReverseMask(MaskAsInts); |
| 2173 | } |
| 2174 | |
| 2175 | /// Return true if this shuffle swaps the order of elements from exactly |
| 2176 | /// one source vector. |
| 2177 | /// Example: shufflevector <4 x n> A, <4 x n> B, <3,undef,1,undef> |
| 2178 | /// TODO: Optionally allow length-changing shuffles. |
| 2179 | bool isReverse() const { |
| 2180 | return !changesLength() && isReverseMask(ShuffleMask); |
| 2181 | } |
| 2182 | |
| 2183 | /// Return true if this shuffle mask chooses all elements with the same value |
| 2184 | /// as the first element of exactly one source vector. |
| 2185 | /// Example: <4,undef,undef,4> |
| 2186 | /// This assumes that vector operands are the same length as the mask. |
| 2187 | static bool isZeroEltSplatMask(ArrayRef<int> Mask); |
| 2188 | static bool isZeroEltSplatMask(const Constant *Mask) { |
| 2189 | assert(Mask->getType()->isVectorTy() && "Shuffle needs vector constant.")((Mask->getType()->isVectorTy() && "Shuffle needs vector constant." ) ? static_cast<void> (0) : __assert_fail ("Mask->getType()->isVectorTy() && \"Shuffle needs vector constant.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2189, __PRETTY_FUNCTION__)); |
| 2190 | SmallVector<int, 16> MaskAsInts; |
| 2191 | getShuffleMask(Mask, MaskAsInts); |
| 2192 | return isZeroEltSplatMask(MaskAsInts); |
| 2193 | } |
| 2194 | |
| 2195 | /// Return true if all elements of this shuffle are the same value as the |
| 2196 | /// first element of exactly one source vector without changing the length |
| 2197 | /// of that vector. |
| 2198 | /// Example: shufflevector <4 x n> A, <4 x n> B, <undef,0,undef,0> |
| 2199 | /// TODO: Optionally allow length-changing shuffles. |
| 2200 | /// TODO: Optionally allow splats from other elements. |
| 2201 | bool isZeroEltSplat() const { |
| 2202 | return !changesLength() && isZeroEltSplatMask(ShuffleMask); |
| 2203 | } |
| 2204 | |
| 2205 | /// Return true if this shuffle mask is a transpose mask. |
| 2206 | /// Transpose vector masks transpose a 2xn matrix. They read corresponding |
| 2207 | /// even- or odd-numbered vector elements from two n-dimensional source |
| 2208 | /// vectors and write each result into consecutive elements of an |
| 2209 | /// n-dimensional destination vector. Two shuffles are necessary to complete |
| 2210 | /// the transpose, one for the even elements and another for the odd elements. |
| 2211 | /// This description closely follows how the TRN1 and TRN2 AArch64 |
| 2212 | /// instructions operate. |
| 2213 | /// |
| 2214 | /// For example, a simple 2x2 matrix can be transposed with: |
| 2215 | /// |
| 2216 | /// ; Original matrix |
| 2217 | /// m0 = < a, b > |
| 2218 | /// m1 = < c, d > |
| 2219 | /// |
| 2220 | /// ; Transposed matrix |
| 2221 | /// t0 = < a, c > = shufflevector m0, m1, < 0, 2 > |
| 2222 | /// t1 = < b, d > = shufflevector m0, m1, < 1, 3 > |
| 2223 | /// |
| 2224 | /// For matrices having greater than n columns, the resulting nx2 transposed |
| 2225 | /// matrix is stored in two result vectors such that one vector contains |
| 2226 | /// interleaved elements from all the even-numbered rows and the other vector |
| 2227 | /// contains interleaved elements from all the odd-numbered rows. For example, |
| 2228 | /// a 2x4 matrix can be transposed with: |
| 2229 | /// |
| 2230 | /// ; Original matrix |
| 2231 | /// m0 = < a, b, c, d > |
| 2232 | /// m1 = < e, f, g, h > |
| 2233 | /// |
| 2234 | /// ; Transposed matrix |
| 2235 | /// t0 = < a, e, c, g > = shufflevector m0, m1 < 0, 4, 2, 6 > |
| 2236 | /// t1 = < b, f, d, h > = shufflevector m0, m1 < 1, 5, 3, 7 > |
| 2237 | static bool isTransposeMask(ArrayRef<int> Mask); |
| 2238 | static bool isTransposeMask(const Constant *Mask) { |
| 2239 | assert(Mask->getType()->isVectorTy() && "Shuffle needs vector constant.")((Mask->getType()->isVectorTy() && "Shuffle needs vector constant." ) ? static_cast<void> (0) : __assert_fail ("Mask->getType()->isVectorTy() && \"Shuffle needs vector constant.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2239, __PRETTY_FUNCTION__)); |
| 2240 | SmallVector<int, 16> MaskAsInts; |
| 2241 | getShuffleMask(Mask, MaskAsInts); |
| 2242 | return isTransposeMask(MaskAsInts); |
| 2243 | } |
| 2244 | |
| 2245 | /// Return true if this shuffle transposes the elements of its inputs without |
| 2246 | /// changing the length of the vectors. This operation may also be known as a |
| 2247 | /// merge or interleave. See the description for isTransposeMask() for the |
| 2248 | /// exact specification. |
| 2249 | /// Example: shufflevector <4 x n> A, <4 x n> B, <0,4,2,6> |
| 2250 | bool isTranspose() const { |
| 2251 | return !changesLength() && isTransposeMask(ShuffleMask); |
| 2252 | } |
| 2253 | |
| 2254 | /// Return true if this shuffle mask is an extract subvector mask. |
| 2255 | /// A valid extract subvector mask returns a smaller vector from a single |
| 2256 | /// source operand. The base extraction index is returned as well. |
| 2257 | static bool isExtractSubvectorMask(ArrayRef<int> Mask, int NumSrcElts, |
| 2258 | int &Index); |
| 2259 | static bool isExtractSubvectorMask(const Constant *Mask, int NumSrcElts, |
| 2260 | int &Index) { |
| 2261 | assert(Mask->getType()->isVectorTy() && "Shuffle needs vector constant.")((Mask->getType()->isVectorTy() && "Shuffle needs vector constant." ) ? static_cast<void> (0) : __assert_fail ("Mask->getType()->isVectorTy() && \"Shuffle needs vector constant.\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2261, __PRETTY_FUNCTION__)); |
| 2262 | // Not possible to express a shuffle mask for a scalable vector for this |
| 2263 | // case. |
| 2264 | if (isa<ScalableVectorType>(Mask->getType())) |
| 2265 | return false; |
| 2266 | SmallVector<int, 16> MaskAsInts; |
| 2267 | getShuffleMask(Mask, MaskAsInts); |
| 2268 | return isExtractSubvectorMask(MaskAsInts, NumSrcElts, Index); |
| 2269 | } |
| 2270 | |
| 2271 | /// Return true if this shuffle mask is an extract subvector mask. |
| 2272 | bool isExtractSubvectorMask(int &Index) const { |
| 2273 | // Not possible to express a shuffle mask for a scalable vector for this |
| 2274 | // case. |
| 2275 | if (isa<ScalableVectorType>(getType())) |
| 2276 | return false; |
| 2277 | |
| 2278 | int NumSrcElts = |
| 2279 | cast<FixedVectorType>(Op<0>()->getType())->getNumElements(); |
| 2280 | return isExtractSubvectorMask(ShuffleMask, NumSrcElts, Index); |
| 2281 | } |
| 2282 | |
| 2283 | /// Change values in a shuffle permute mask assuming the two vector operands |
| 2284 | /// of length InVecNumElts have swapped position. |
| 2285 | static void commuteShuffleMask(MutableArrayRef<int> Mask, |
| 2286 | unsigned InVecNumElts) { |
| 2287 | for (int &Idx : Mask) { |
| 2288 | if (Idx == -1) |
| 2289 | continue; |
| 2290 | Idx = Idx < (int)InVecNumElts ? Idx + InVecNumElts : Idx - InVecNumElts; |
| 2291 | assert(Idx >= 0 && Idx < (int)InVecNumElts * 2 &&((Idx >= 0 && Idx < (int)InVecNumElts * 2 && "shufflevector mask index out of range") ? static_cast<void > (0) : __assert_fail ("Idx >= 0 && Idx < (int)InVecNumElts * 2 && \"shufflevector mask index out of range\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2292, __PRETTY_FUNCTION__)) |
| 2292 | "shufflevector mask index out of range")((Idx >= 0 && Idx < (int)InVecNumElts * 2 && "shufflevector mask index out of range") ? static_cast<void > (0) : __assert_fail ("Idx >= 0 && Idx < (int)InVecNumElts * 2 && \"shufflevector mask index out of range\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2292, __PRETTY_FUNCTION__)); |
| 2293 | } |
| 2294 | } |
| 2295 | |
| 2296 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 2297 | static bool classof(const Instruction *I) { |
| 2298 | return I->getOpcode() == Instruction::ShuffleVector; |
| 2299 | } |
| 2300 | static bool classof(const Value *V) { |
| 2301 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 2302 | } |
| 2303 | }; |
| 2304 | |
| 2305 | template <> |
| 2306 | struct OperandTraits<ShuffleVectorInst> |
| 2307 | : public FixedNumOperandTraits<ShuffleVectorInst, 2> {}; |
| 2308 | |
| 2309 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ShuffleVectorInst, Value)ShuffleVectorInst::op_iterator ShuffleVectorInst::op_begin() { return OperandTraits<ShuffleVectorInst>::op_begin(this ); } ShuffleVectorInst::const_op_iterator ShuffleVectorInst:: op_begin() const { return OperandTraits<ShuffleVectorInst> ::op_begin(const_cast<ShuffleVectorInst*>(this)); } ShuffleVectorInst ::op_iterator ShuffleVectorInst::op_end() { return OperandTraits <ShuffleVectorInst>::op_end(this); } ShuffleVectorInst:: const_op_iterator ShuffleVectorInst::op_end() const { return OperandTraits <ShuffleVectorInst>::op_end(const_cast<ShuffleVectorInst *>(this)); } Value *ShuffleVectorInst::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<ShuffleVectorInst >::operands(this) && "getOperand() out of range!") ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<ShuffleVectorInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2309, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<ShuffleVectorInst>::op_begin(const_cast <ShuffleVectorInst*>(this))[i_nocapture].get()); } void ShuffleVectorInst::setOperand(unsigned i_nocapture, Value *Val_nocapture ) { ((i_nocapture < OperandTraits<ShuffleVectorInst> ::operands(this) && "setOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<ShuffleVectorInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2309, __PRETTY_FUNCTION__)); OperandTraits<ShuffleVectorInst >::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned ShuffleVectorInst::getNumOperands() const { return OperandTraits <ShuffleVectorInst>::operands(this); } template <int Idx_nocapture> Use &ShuffleVectorInst::Op() { return this ->OpFrom<Idx_nocapture>(this); } template <int Idx_nocapture > const Use &ShuffleVectorInst::Op() const { return this ->OpFrom<Idx_nocapture>(this); } |
| 2310 | |
| 2311 | //===----------------------------------------------------------------------===// |
| 2312 | // ExtractValueInst Class |
| 2313 | //===----------------------------------------------------------------------===// |
| 2314 | |
| 2315 | /// This instruction extracts a struct member or array |
| 2316 | /// element value from an aggregate value. |
| 2317 | /// |
| 2318 | class ExtractValueInst : public UnaryInstruction { |
| 2319 | SmallVector<unsigned, 4> Indices; |
| 2320 | |
| 2321 | ExtractValueInst(const ExtractValueInst &EVI); |
| 2322 | |
| 2323 | /// Constructors - Create a extractvalue instruction with a base aggregate |
| 2324 | /// value and a list of indices. The first ctor can optionally insert before |
| 2325 | /// an existing instruction, the second appends the new instruction to the |
| 2326 | /// specified BasicBlock. |
| 2327 | inline ExtractValueInst(Value *Agg, |
| 2328 | ArrayRef<unsigned> Idxs, |
| 2329 | const Twine &NameStr, |
| 2330 | Instruction *InsertBefore); |
| 2331 | inline ExtractValueInst(Value *Agg, |
| 2332 | ArrayRef<unsigned> Idxs, |
| 2333 | const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 2334 | |
| 2335 | void init(ArrayRef<unsigned> Idxs, const Twine &NameStr); |
| 2336 | |
| 2337 | protected: |
| 2338 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 2339 | friend class Instruction; |
| 2340 | |
| 2341 | ExtractValueInst *cloneImpl() const; |
| 2342 | |
| 2343 | public: |
| 2344 | static ExtractValueInst *Create(Value *Agg, |
| 2345 | ArrayRef<unsigned> Idxs, |
| 2346 | const Twine &NameStr = "", |
| 2347 | Instruction *InsertBefore = nullptr) { |
| 2348 | return new |
| 2349 | ExtractValueInst(Agg, Idxs, NameStr, InsertBefore); |
| 2350 | } |
| 2351 | |
| 2352 | static ExtractValueInst *Create(Value *Agg, |
| 2353 | ArrayRef<unsigned> Idxs, |
| 2354 | const Twine &NameStr, |
| 2355 | BasicBlock *InsertAtEnd) { |
| 2356 | return new ExtractValueInst(Agg, Idxs, NameStr, InsertAtEnd); |
| 2357 | } |
| 2358 | |
| 2359 | /// Returns the type of the element that would be extracted |
| 2360 | /// with an extractvalue instruction with the specified parameters. |
| 2361 | /// |
| 2362 | /// Null is returned if the indices are invalid for the specified type. |
| 2363 | static Type *getIndexedType(Type *Agg, ArrayRef<unsigned> Idxs); |
| 2364 | |
| 2365 | using idx_iterator = const unsigned*; |
| 2366 | |
| 2367 | inline idx_iterator idx_begin() const { return Indices.begin(); } |
| 2368 | inline idx_iterator idx_end() const { return Indices.end(); } |
| 2369 | inline iterator_range<idx_iterator> indices() const { |
| 2370 | return make_range(idx_begin(), idx_end()); |
| 2371 | } |
| 2372 | |
| 2373 | Value *getAggregateOperand() { |
| 2374 | return getOperand(0); |
| 2375 | } |
| 2376 | const Value *getAggregateOperand() const { |
| 2377 | return getOperand(0); |
| 2378 | } |
| 2379 | static unsigned getAggregateOperandIndex() { |
| 2380 | return 0U; // get index for modifying correct operand |
| 2381 | } |
| 2382 | |
| 2383 | ArrayRef<unsigned> getIndices() const { |
| 2384 | return Indices; |
| 2385 | } |
| 2386 | |
| 2387 | unsigned getNumIndices() const { |
| 2388 | return (unsigned)Indices.size(); |
| 2389 | } |
| 2390 | |
| 2391 | bool hasIndices() const { |
| 2392 | return true; |
| 2393 | } |
| 2394 | |
| 2395 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 2396 | static bool classof(const Instruction *I) { |
| 2397 | return I->getOpcode() == Instruction::ExtractValue; |
| 2398 | } |
| 2399 | static bool classof(const Value *V) { |
| 2400 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 2401 | } |
| 2402 | }; |
| 2403 | |
| 2404 | ExtractValueInst::ExtractValueInst(Value *Agg, |
| 2405 | ArrayRef<unsigned> Idxs, |
| 2406 | const Twine &NameStr, |
| 2407 | Instruction *InsertBefore) |
| 2408 | : UnaryInstruction(checkGEPType(getIndexedType(Agg->getType(), Idxs)), |
| 2409 | ExtractValue, Agg, InsertBefore) { |
| 2410 | init(Idxs, NameStr); |
| 2411 | } |
| 2412 | |
| 2413 | ExtractValueInst::ExtractValueInst(Value *Agg, |
| 2414 | ArrayRef<unsigned> Idxs, |
| 2415 | const Twine &NameStr, |
| 2416 | BasicBlock *InsertAtEnd) |
| 2417 | : UnaryInstruction(checkGEPType(getIndexedType(Agg->getType(), Idxs)), |
| 2418 | ExtractValue, Agg, InsertAtEnd) { |
| 2419 | init(Idxs, NameStr); |
| 2420 | } |
| 2421 | |
| 2422 | //===----------------------------------------------------------------------===// |
| 2423 | // InsertValueInst Class |
| 2424 | //===----------------------------------------------------------------------===// |
| 2425 | |
| 2426 | /// This instruction inserts a struct field of array element |
| 2427 | /// value into an aggregate value. |
| 2428 | /// |
| 2429 | class InsertValueInst : public Instruction { |
| 2430 | SmallVector<unsigned, 4> Indices; |
| 2431 | |
| 2432 | InsertValueInst(const InsertValueInst &IVI); |
| 2433 | |
| 2434 | /// Constructors - Create a insertvalue instruction with a base aggregate |
| 2435 | /// value, a value to insert, and a list of indices. The first ctor can |
| 2436 | /// optionally insert before an existing instruction, the second appends |
| 2437 | /// the new instruction to the specified BasicBlock. |
| 2438 | inline InsertValueInst(Value *Agg, Value *Val, |
| 2439 | ArrayRef<unsigned> Idxs, |
| 2440 | const Twine &NameStr, |
| 2441 | Instruction *InsertBefore); |
| 2442 | inline InsertValueInst(Value *Agg, Value *Val, |
| 2443 | ArrayRef<unsigned> Idxs, |
| 2444 | const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 2445 | |
| 2446 | /// Constructors - These two constructors are convenience methods because one |
| 2447 | /// and two index insertvalue instructions are so common. |
| 2448 | InsertValueInst(Value *Agg, Value *Val, unsigned Idx, |
| 2449 | const Twine &NameStr = "", |
| 2450 | Instruction *InsertBefore = nullptr); |
| 2451 | InsertValueInst(Value *Agg, Value *Val, unsigned Idx, const Twine &NameStr, |
| 2452 | BasicBlock *InsertAtEnd); |
| 2453 | |
| 2454 | void init(Value *Agg, Value *Val, ArrayRef<unsigned> Idxs, |
| 2455 | const Twine &NameStr); |
| 2456 | |
| 2457 | protected: |
| 2458 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 2459 | friend class Instruction; |
| 2460 | |
| 2461 | InsertValueInst *cloneImpl() const; |
| 2462 | |
| 2463 | public: |
| 2464 | // allocate space for exactly two operands |
| 2465 | void *operator new(size_t s) { |
| 2466 | return User::operator new(s, 2); |
| 2467 | } |
| 2468 | |
| 2469 | static InsertValueInst *Create(Value *Agg, Value *Val, |
| 2470 | ArrayRef<unsigned> Idxs, |
| 2471 | const Twine &NameStr = "", |
| 2472 | Instruction *InsertBefore = nullptr) { |
| 2473 | return new InsertValueInst(Agg, Val, Idxs, NameStr, InsertBefore); |
| 2474 | } |
| 2475 | |
| 2476 | static InsertValueInst *Create(Value *Agg, Value *Val, |
| 2477 | ArrayRef<unsigned> Idxs, |
| 2478 | const Twine &NameStr, |
| 2479 | BasicBlock *InsertAtEnd) { |
| 2480 | return new InsertValueInst(Agg, Val, Idxs, NameStr, InsertAtEnd); |
| 2481 | } |
| 2482 | |
| 2483 | /// Transparently provide more efficient getOperand methods. |
| 2484 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 2485 | |
| 2486 | using idx_iterator = const unsigned*; |
| 2487 | |
| 2488 | inline idx_iterator idx_begin() const { return Indices.begin(); } |
| 2489 | inline idx_iterator idx_end() const { return Indices.end(); } |
| 2490 | inline iterator_range<idx_iterator> indices() const { |
| 2491 | return make_range(idx_begin(), idx_end()); |
| 2492 | } |
| 2493 | |
| 2494 | Value *getAggregateOperand() { |
| 2495 | return getOperand(0); |
| 2496 | } |
| 2497 | const Value *getAggregateOperand() const { |
| 2498 | return getOperand(0); |
| 2499 | } |
| 2500 | static unsigned getAggregateOperandIndex() { |
| 2501 | return 0U; // get index for modifying correct operand |
| 2502 | } |
| 2503 | |
| 2504 | Value *getInsertedValueOperand() { |
| 2505 | return getOperand(1); |
| 2506 | } |
| 2507 | const Value *getInsertedValueOperand() const { |
| 2508 | return getOperand(1); |
| 2509 | } |
| 2510 | static unsigned getInsertedValueOperandIndex() { |
| 2511 | return 1U; // get index for modifying correct operand |
| 2512 | } |
| 2513 | |
| 2514 | ArrayRef<unsigned> getIndices() const { |
| 2515 | return Indices; |
| 2516 | } |
| 2517 | |
| 2518 | unsigned getNumIndices() const { |
| 2519 | return (unsigned)Indices.size(); |
| 2520 | } |
| 2521 | |
| 2522 | bool hasIndices() const { |
| 2523 | return true; |
| 2524 | } |
| 2525 | |
| 2526 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 2527 | static bool classof(const Instruction *I) { |
| 2528 | return I->getOpcode() == Instruction::InsertValue; |
| 2529 | } |
| 2530 | static bool classof(const Value *V) { |
| 2531 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 2532 | } |
| 2533 | }; |
| 2534 | |
| 2535 | template <> |
| 2536 | struct OperandTraits<InsertValueInst> : |
| 2537 | public FixedNumOperandTraits<InsertValueInst, 2> { |
| 2538 | }; |
| 2539 | |
| 2540 | InsertValueInst::InsertValueInst(Value *Agg, |
| 2541 | Value *Val, |
| 2542 | ArrayRef<unsigned> Idxs, |
| 2543 | const Twine &NameStr, |
| 2544 | Instruction *InsertBefore) |
| 2545 | : Instruction(Agg->getType(), InsertValue, |
| 2546 | OperandTraits<InsertValueInst>::op_begin(this), |
| 2547 | 2, InsertBefore) { |
| 2548 | init(Agg, Val, Idxs, NameStr); |
| 2549 | } |
| 2550 | |
| 2551 | InsertValueInst::InsertValueInst(Value *Agg, |
| 2552 | Value *Val, |
| 2553 | ArrayRef<unsigned> Idxs, |
| 2554 | const Twine &NameStr, |
| 2555 | BasicBlock *InsertAtEnd) |
| 2556 | : Instruction(Agg->getType(), InsertValue, |
| 2557 | OperandTraits<InsertValueInst>::op_begin(this), |
| 2558 | 2, InsertAtEnd) { |
| 2559 | init(Agg, Val, Idxs, NameStr); |
| 2560 | } |
| 2561 | |
| 2562 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(InsertValueInst, Value)InsertValueInst::op_iterator InsertValueInst::op_begin() { return OperandTraits<InsertValueInst>::op_begin(this); } InsertValueInst ::const_op_iterator InsertValueInst::op_begin() const { return OperandTraits<InsertValueInst>::op_begin(const_cast< InsertValueInst*>(this)); } InsertValueInst::op_iterator InsertValueInst ::op_end() { return OperandTraits<InsertValueInst>::op_end (this); } InsertValueInst::const_op_iterator InsertValueInst:: op_end() const { return OperandTraits<InsertValueInst>:: op_end(const_cast<InsertValueInst*>(this)); } Value *InsertValueInst ::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<InsertValueInst>::operands(this) && "getOperand() out of range!") ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<InsertValueInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2562, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<InsertValueInst>::op_begin(const_cast< InsertValueInst*>(this))[i_nocapture].get()); } void InsertValueInst ::setOperand(unsigned i_nocapture, Value *Val_nocapture) { (( i_nocapture < OperandTraits<InsertValueInst>::operands (this) && "setOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<InsertValueInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2562, __PRETTY_FUNCTION__)); OperandTraits<InsertValueInst >::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned InsertValueInst::getNumOperands() const { return OperandTraits <InsertValueInst>::operands(this); } template <int Idx_nocapture > Use &InsertValueInst::Op() { return this->OpFrom< Idx_nocapture>(this); } template <int Idx_nocapture> const Use &InsertValueInst::Op() const { return this-> OpFrom<Idx_nocapture>(this); } |
| 2563 | |
| 2564 | //===----------------------------------------------------------------------===// |
| 2565 | // PHINode Class |
| 2566 | //===----------------------------------------------------------------------===// |
| 2567 | |
| 2568 | // PHINode - The PHINode class is used to represent the magical mystical PHI |
| 2569 | // node, that can not exist in nature, but can be synthesized in a computer |
| 2570 | // scientist's overactive imagination. |
| 2571 | // |
| 2572 | class PHINode : public Instruction { |
| 2573 | /// The number of operands actually allocated. NumOperands is |
| 2574 | /// the number actually in use. |
| 2575 | unsigned ReservedSpace; |
| 2576 | |
| 2577 | PHINode(const PHINode &PN); |
| 2578 | |
| 2579 | explicit PHINode(Type *Ty, unsigned NumReservedValues, |
| 2580 | const Twine &NameStr = "", |
| 2581 | Instruction *InsertBefore = nullptr) |
| 2582 | : Instruction(Ty, Instruction::PHI, nullptr, 0, InsertBefore), |
| 2583 | ReservedSpace(NumReservedValues) { |
| 2584 | setName(NameStr); |
| 2585 | allocHungoffUses(ReservedSpace); |
| 2586 | } |
| 2587 | |
| 2588 | PHINode(Type *Ty, unsigned NumReservedValues, const Twine &NameStr, |
| 2589 | BasicBlock *InsertAtEnd) |
| 2590 | : Instruction(Ty, Instruction::PHI, nullptr, 0, InsertAtEnd), |
| 2591 | ReservedSpace(NumReservedValues) { |
| 2592 | setName(NameStr); |
| 2593 | allocHungoffUses(ReservedSpace); |
| 2594 | } |
| 2595 | |
| 2596 | protected: |
| 2597 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 2598 | friend class Instruction; |
| 2599 | |
| 2600 | PHINode *cloneImpl() const; |
| 2601 | |
| 2602 | // allocHungoffUses - this is more complicated than the generic |
| 2603 | // User::allocHungoffUses, because we have to allocate Uses for the incoming |
| 2604 | // values and pointers to the incoming blocks, all in one allocation. |
| 2605 | void allocHungoffUses(unsigned N) { |
| 2606 | User::allocHungoffUses(N, /* IsPhi */ true); |
| 2607 | } |
| 2608 | |
| 2609 | public: |
| 2610 | /// Constructors - NumReservedValues is a hint for the number of incoming |
| 2611 | /// edges that this phi node will have (use 0 if you really have no idea). |
| 2612 | static PHINode *Create(Type *Ty, unsigned NumReservedValues, |
| 2613 | const Twine &NameStr = "", |
| 2614 | Instruction *InsertBefore = nullptr) { |
| 2615 | return new PHINode(Ty, NumReservedValues, NameStr, InsertBefore); |
| 2616 | } |
| 2617 | |
| 2618 | static PHINode *Create(Type *Ty, unsigned NumReservedValues, |
| 2619 | const Twine &NameStr, BasicBlock *InsertAtEnd) { |
| 2620 | return new PHINode(Ty, NumReservedValues, NameStr, InsertAtEnd); |
| 2621 | } |
| 2622 | |
| 2623 | /// Provide fast operand accessors |
| 2624 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 2625 | |
| 2626 | // Block iterator interface. This provides access to the list of incoming |
| 2627 | // basic blocks, which parallels the list of incoming values. |
| 2628 | |
| 2629 | using block_iterator = BasicBlock **; |
| 2630 | using const_block_iterator = BasicBlock * const *; |
| 2631 | |
| 2632 | block_iterator block_begin() { |
| 2633 | return reinterpret_cast<block_iterator>(op_begin() + ReservedSpace); |
| 2634 | } |
| 2635 | |
| 2636 | const_block_iterator block_begin() const { |
| 2637 | return reinterpret_cast<const_block_iterator>(op_begin() + ReservedSpace); |
| 2638 | } |
| 2639 | |
| 2640 | block_iterator block_end() { |
| 2641 | return block_begin() + getNumOperands(); |
| 2642 | } |
| 2643 | |
| 2644 | const_block_iterator block_end() const { |
| 2645 | return block_begin() + getNumOperands(); |
| 2646 | } |
| 2647 | |
| 2648 | iterator_range<block_iterator> blocks() { |
| 2649 | return make_range(block_begin(), block_end()); |
| 2650 | } |
| 2651 | |
| 2652 | iterator_range<const_block_iterator> blocks() const { |
| 2653 | return make_range(block_begin(), block_end()); |
| 2654 | } |
| 2655 | |
| 2656 | op_range incoming_values() { return operands(); } |
| 2657 | |
| 2658 | const_op_range incoming_values() const { return operands(); } |
| 2659 | |
| 2660 | /// Return the number of incoming edges |
| 2661 | /// |
| 2662 | unsigned getNumIncomingValues() const { return getNumOperands(); } |
| 2663 | |
| 2664 | /// Return incoming value number x |
| 2665 | /// |
| 2666 | Value *getIncomingValue(unsigned i) const { |
| 2667 | return getOperand(i); |
| 2668 | } |
| 2669 | void setIncomingValue(unsigned i, Value *V) { |
| 2670 | assert(V && "PHI node got a null value!")((V && "PHI node got a null value!") ? static_cast< void> (0) : __assert_fail ("V && \"PHI node got a null value!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2670, __PRETTY_FUNCTION__)); |
| 2671 | assert(getType() == V->getType() &&((getType() == V->getType() && "All operands to PHI node must be the same type as the PHI node!" ) ? static_cast<void> (0) : __assert_fail ("getType() == V->getType() && \"All operands to PHI node must be the same type as the PHI node!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2672, __PRETTY_FUNCTION__)) |
| 2672 | "All operands to PHI node must be the same type as the PHI node!")((getType() == V->getType() && "All operands to PHI node must be the same type as the PHI node!" ) ? static_cast<void> (0) : __assert_fail ("getType() == V->getType() && \"All operands to PHI node must be the same type as the PHI node!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2672, __PRETTY_FUNCTION__)); |
| 2673 | setOperand(i, V); |
| 2674 | } |
| 2675 | |
| 2676 | static unsigned getOperandNumForIncomingValue(unsigned i) { |
| 2677 | return i; |
| 2678 | } |
| 2679 | |
| 2680 | static unsigned getIncomingValueNumForOperand(unsigned i) { |
| 2681 | return i; |
| 2682 | } |
| 2683 | |
| 2684 | /// Return incoming basic block number @p i. |
| 2685 | /// |
| 2686 | BasicBlock *getIncomingBlock(unsigned i) const { |
| 2687 | return block_begin()[i]; |
| 2688 | } |
| 2689 | |
| 2690 | /// Return incoming basic block corresponding |
| 2691 | /// to an operand of the PHI. |
| 2692 | /// |
| 2693 | BasicBlock *getIncomingBlock(const Use &U) const { |
| 2694 | assert(this == U.getUser() && "Iterator doesn't point to PHI's Uses?")((this == U.getUser() && "Iterator doesn't point to PHI's Uses?" ) ? static_cast<void> (0) : __assert_fail ("this == U.getUser() && \"Iterator doesn't point to PHI's Uses?\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2694, __PRETTY_FUNCTION__)); |
| 2695 | return getIncomingBlock(unsigned(&U - op_begin())); |
| 2696 | } |
| 2697 | |
| 2698 | /// Return incoming basic block corresponding |
| 2699 | /// to value use iterator. |
| 2700 | /// |
| 2701 | BasicBlock *getIncomingBlock(Value::const_user_iterator I) const { |
| 2702 | return getIncomingBlock(I.getUse()); |
| 2703 | } |
| 2704 | |
| 2705 | void setIncomingBlock(unsigned i, BasicBlock *BB) { |
| 2706 | assert(BB && "PHI node got a null basic block!")((BB && "PHI node got a null basic block!") ? static_cast <void> (0) : __assert_fail ("BB && \"PHI node got a null basic block!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2706, __PRETTY_FUNCTION__)); |
| 2707 | block_begin()[i] = BB; |
| 2708 | } |
| 2709 | |
| 2710 | /// Replace every incoming basic block \p Old to basic block \p New. |
| 2711 | void replaceIncomingBlockWith(const BasicBlock *Old, BasicBlock *New) { |
| 2712 | assert(New && Old && "PHI node got a null basic block!")((New && Old && "PHI node got a null basic block!" ) ? static_cast<void> (0) : __assert_fail ("New && Old && \"PHI node got a null basic block!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2712, __PRETTY_FUNCTION__)); |
| 2713 | for (unsigned Op = 0, NumOps = getNumOperands(); Op != NumOps; ++Op) |
| 2714 | if (getIncomingBlock(Op) == Old) |
| 2715 | setIncomingBlock(Op, New); |
| 2716 | } |
| 2717 | |
| 2718 | /// Add an incoming value to the end of the PHI list |
| 2719 | /// |
| 2720 | void addIncoming(Value *V, BasicBlock *BB) { |
| 2721 | if (getNumOperands() == ReservedSpace) |
| 2722 | growOperands(); // Get more space! |
| 2723 | // Initialize some new operands. |
| 2724 | setNumHungOffUseOperands(getNumOperands() + 1); |
| 2725 | setIncomingValue(getNumOperands() - 1, V); |
| 2726 | setIncomingBlock(getNumOperands() - 1, BB); |
| 2727 | } |
| 2728 | |
| 2729 | /// Remove an incoming value. This is useful if a |
| 2730 | /// predecessor basic block is deleted. The value removed is returned. |
| 2731 | /// |
| 2732 | /// If the last incoming value for a PHI node is removed (and DeletePHIIfEmpty |
| 2733 | /// is true), the PHI node is destroyed and any uses of it are replaced with |
| 2734 | /// dummy values. The only time there should be zero incoming values to a PHI |
| 2735 | /// node is when the block is dead, so this strategy is sound. |
| 2736 | /// |
| 2737 | Value *removeIncomingValue(unsigned Idx, bool DeletePHIIfEmpty = true); |
| 2738 | |
| 2739 | Value *removeIncomingValue(const BasicBlock *BB, bool DeletePHIIfEmpty=true) { |
| 2740 | int Idx = getBasicBlockIndex(BB); |
| 2741 | assert(Idx >= 0 && "Invalid basic block argument to remove!")((Idx >= 0 && "Invalid basic block argument to remove!" ) ? static_cast<void> (0) : __assert_fail ("Idx >= 0 && \"Invalid basic block argument to remove!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2741, __PRETTY_FUNCTION__)); |
| 2742 | return removeIncomingValue(Idx, DeletePHIIfEmpty); |
| 2743 | } |
| 2744 | |
| 2745 | /// Return the first index of the specified basic |
| 2746 | /// block in the value list for this PHI. Returns -1 if no instance. |
| 2747 | /// |
| 2748 | int getBasicBlockIndex(const BasicBlock *BB) const { |
| 2749 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) |
| 2750 | if (block_begin()[i] == BB) |
| 2751 | return i; |
| 2752 | return -1; |
| 2753 | } |
| 2754 | |
| 2755 | Value *getIncomingValueForBlock(const BasicBlock *BB) const { |
| 2756 | int Idx = getBasicBlockIndex(BB); |
| 2757 | assert(Idx >= 0 && "Invalid basic block argument!")((Idx >= 0 && "Invalid basic block argument!") ? static_cast <void> (0) : __assert_fail ("Idx >= 0 && \"Invalid basic block argument!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2757, __PRETTY_FUNCTION__)); |
| 2758 | return getIncomingValue(Idx); |
| 2759 | } |
| 2760 | |
| 2761 | /// Set every incoming value(s) for block \p BB to \p V. |
| 2762 | void setIncomingValueForBlock(const BasicBlock *BB, Value *V) { |
| 2763 | assert(BB && "PHI node got a null basic block!")((BB && "PHI node got a null basic block!") ? static_cast <void> (0) : __assert_fail ("BB && \"PHI node got a null basic block!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2763, __PRETTY_FUNCTION__)); |
| 2764 | bool Found = false; |
| 2765 | for (unsigned Op = 0, NumOps = getNumOperands(); Op != NumOps; ++Op) |
| 2766 | if (getIncomingBlock(Op) == BB) { |
| 2767 | Found = true; |
| 2768 | setIncomingValue(Op, V); |
| 2769 | } |
| 2770 | (void)Found; |
| 2771 | assert(Found && "Invalid basic block argument to set!")((Found && "Invalid basic block argument to set!") ? static_cast <void> (0) : __assert_fail ("Found && \"Invalid basic block argument to set!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2771, __PRETTY_FUNCTION__)); |
| 2772 | } |
| 2773 | |
| 2774 | /// If the specified PHI node always merges together the |
| 2775 | /// same value, return the value, otherwise return null. |
| 2776 | Value *hasConstantValue() const; |
| 2777 | |
| 2778 | /// Whether the specified PHI node always merges |
| 2779 | /// together the same value, assuming undefs are equal to a unique |
| 2780 | /// non-undef value. |
| 2781 | bool hasConstantOrUndefValue() const; |
| 2782 | |
| 2783 | /// If the PHI node is complete which means all of its parent's predecessors |
| 2784 | /// have incoming value in this PHI, return true, otherwise return false. |
| 2785 | bool isComplete() const { |
| 2786 | return llvm::all_of(predecessors(getParent()), |
| 2787 | [this](const BasicBlock *Pred) { |
| 2788 | return getBasicBlockIndex(Pred) >= 0; |
| 2789 | }); |
| 2790 | } |
| 2791 | |
| 2792 | /// Methods for support type inquiry through isa, cast, and dyn_cast: |
| 2793 | static bool classof(const Instruction *I) { |
| 2794 | return I->getOpcode() == Instruction::PHI; |
| 2795 | } |
| 2796 | static bool classof(const Value *V) { |
| 2797 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 2798 | } |
| 2799 | |
| 2800 | private: |
| 2801 | void growOperands(); |
| 2802 | }; |
| 2803 | |
| 2804 | template <> |
| 2805 | struct OperandTraits<PHINode> : public HungoffOperandTraits<2> { |
| 2806 | }; |
| 2807 | |
| 2808 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(PHINode, Value)PHINode::op_iterator PHINode::op_begin() { return OperandTraits <PHINode>::op_begin(this); } PHINode::const_op_iterator PHINode::op_begin() const { return OperandTraits<PHINode> ::op_begin(const_cast<PHINode*>(this)); } PHINode::op_iterator PHINode::op_end() { return OperandTraits<PHINode>::op_end (this); } PHINode::const_op_iterator PHINode::op_end() const { return OperandTraits<PHINode>::op_end(const_cast<PHINode *>(this)); } Value *PHINode::getOperand(unsigned i_nocapture ) const { ((i_nocapture < OperandTraits<PHINode>::operands (this) && "getOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<PHINode>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2808, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<PHINode>::op_begin(const_cast<PHINode *>(this))[i_nocapture].get()); } void PHINode::setOperand( unsigned i_nocapture, Value *Val_nocapture) { ((i_nocapture < OperandTraits<PHINode>::operands(this) && "setOperand() out of range!" ) ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<PHINode>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2808, __PRETTY_FUNCTION__)); OperandTraits<PHINode>:: op_begin(this)[i_nocapture] = Val_nocapture; } unsigned PHINode ::getNumOperands() const { return OperandTraits<PHINode> ::operands(this); } template <int Idx_nocapture> Use & PHINode::Op() { return this->OpFrom<Idx_nocapture>(this ); } template <int Idx_nocapture> const Use &PHINode ::Op() const { return this->OpFrom<Idx_nocapture>(this ); } |
| 2809 | |
| 2810 | //===----------------------------------------------------------------------===// |
| 2811 | // LandingPadInst Class |
| 2812 | //===----------------------------------------------------------------------===// |
| 2813 | |
| 2814 | //===--------------------------------------------------------------------------- |
| 2815 | /// The landingpad instruction holds all of the information |
| 2816 | /// necessary to generate correct exception handling. The landingpad instruction |
| 2817 | /// cannot be moved from the top of a landing pad block, which itself is |
| 2818 | /// accessible only from the 'unwind' edge of an invoke. This uses the |
| 2819 | /// SubclassData field in Value to store whether or not the landingpad is a |
| 2820 | /// cleanup. |
| 2821 | /// |
| 2822 | class LandingPadInst : public Instruction { |
| 2823 | using CleanupField = BoolBitfieldElementT<0>; |
| 2824 | |
| 2825 | /// The number of operands actually allocated. NumOperands is |
| 2826 | /// the number actually in use. |
| 2827 | unsigned ReservedSpace; |
| 2828 | |
| 2829 | LandingPadInst(const LandingPadInst &LP); |
| 2830 | |
| 2831 | public: |
| 2832 | enum ClauseType { Catch, Filter }; |
| 2833 | |
| 2834 | private: |
| 2835 | explicit LandingPadInst(Type *RetTy, unsigned NumReservedValues, |
| 2836 | const Twine &NameStr, Instruction *InsertBefore); |
| 2837 | explicit LandingPadInst(Type *RetTy, unsigned NumReservedValues, |
| 2838 | const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 2839 | |
| 2840 | // Allocate space for exactly zero operands. |
| 2841 | void *operator new(size_t s) { |
| 2842 | return User::operator new(s); |
| 2843 | } |
| 2844 | |
| 2845 | void growOperands(unsigned Size); |
| 2846 | void init(unsigned NumReservedValues, const Twine &NameStr); |
| 2847 | |
| 2848 | protected: |
| 2849 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 2850 | friend class Instruction; |
| 2851 | |
| 2852 | LandingPadInst *cloneImpl() const; |
| 2853 | |
| 2854 | public: |
| 2855 | /// Constructors - NumReservedClauses is a hint for the number of incoming |
| 2856 | /// clauses that this landingpad will have (use 0 if you really have no idea). |
| 2857 | static LandingPadInst *Create(Type *RetTy, unsigned NumReservedClauses, |
| 2858 | const Twine &NameStr = "", |
| 2859 | Instruction *InsertBefore = nullptr); |
| 2860 | static LandingPadInst *Create(Type *RetTy, unsigned NumReservedClauses, |
| 2861 | const Twine &NameStr, BasicBlock *InsertAtEnd); |
| 2862 | |
| 2863 | /// Provide fast operand accessors |
| 2864 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |
| 2865 | |
| 2866 | /// Return 'true' if this landingpad instruction is a |
| 2867 | /// cleanup. I.e., it should be run when unwinding even if its landing pad |
| 2868 | /// doesn't catch the exception. |
| 2869 | bool isCleanup() const { return getSubclassData<CleanupField>(); } |
| 2870 | |
| 2871 | /// Indicate that this landingpad instruction is a cleanup. |
| 2872 | void setCleanup(bool V) { setSubclassData<CleanupField>(V); } |
| 2873 | |
| 2874 | /// Add a catch or filter clause to the landing pad. |
| 2875 | void addClause(Constant *ClauseVal); |
| 2876 | |
| 2877 | /// Get the value of the clause at index Idx. Use isCatch/isFilter to |
| 2878 | /// determine what type of clause this is. |
| 2879 | Constant *getClause(unsigned Idx) const { |
| 2880 | return cast<Constant>(getOperandList()[Idx]); |
| 2881 | } |
| 2882 | |
| 2883 | /// Return 'true' if the clause and index Idx is a catch clause. |
| 2884 | bool isCatch(unsigned Idx) const { |
| 2885 | return !isa<ArrayType>(getOperandList()[Idx]->getType()); |
| 2886 | } |
| 2887 | |
| 2888 | /// Return 'true' if the clause and index Idx is a filter clause. |
| 2889 | bool isFilter(unsigned Idx) const { |
| 2890 | return isa<ArrayType>(getOperandList()[Idx]->getType()); |
| 2891 | } |
| 2892 | |
| 2893 | /// Get the number of clauses for this landing pad. |
| 2894 | unsigned getNumClauses() const { return getNumOperands(); } |
| 2895 | |
| 2896 | /// Grow the size of the operand list to accommodate the new |
| 2897 | /// number of clauses. |
| 2898 | void reserveClauses(unsigned Size) { growOperands(Size); } |
| 2899 | |
| 2900 | // Methods for support type inquiry through isa, cast, and dyn_cast: |
| 2901 | static bool classof(const Instruction *I) { |
| 2902 | return I->getOpcode() == Instruction::LandingPad; |
| 2903 | } |
| 2904 | static bool classof(const Value *V) { |
| 2905 | return isa<Instruction>(V) && classof(cast<Instruction>(V)); |
| 2906 | } |
| 2907 | }; |
| 2908 | |
| 2909 | template <> |
| 2910 | struct OperandTraits<LandingPadInst> : public HungoffOperandTraits<1> { |
| 2911 | }; |
| 2912 | |
| 2913 | DEFINE_TRANSPARENT_OPERAND_ACCESSORS(LandingPadInst, Value)LandingPadInst::op_iterator LandingPadInst::op_begin() { return OperandTraits<LandingPadInst>::op_begin(this); } LandingPadInst ::const_op_iterator LandingPadInst::op_begin() const { return OperandTraits<LandingPadInst>::op_begin(const_cast< LandingPadInst*>(this)); } LandingPadInst::op_iterator LandingPadInst ::op_end() { return OperandTraits<LandingPadInst>::op_end (this); } LandingPadInst::const_op_iterator LandingPadInst::op_end () const { return OperandTraits<LandingPadInst>::op_end (const_cast<LandingPadInst*>(this)); } Value *LandingPadInst ::getOperand(unsigned i_nocapture) const { ((i_nocapture < OperandTraits<LandingPadInst>::operands(this) && "getOperand() out of range!") ? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<LandingPadInst>::operands(this) && \"getOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2913, __PRETTY_FUNCTION__)); return cast_or_null<Value> ( OperandTraits<LandingPadInst>::op_begin(const_cast< LandingPadInst*>(this))[i_nocapture].get()); } void LandingPadInst ::setOperand(unsigned i_nocapture, Value *Val_nocapture) { (( i_nocapture < OperandTraits<LandingPadInst>::operands (this) && "setOperand() out of range!") ? static_cast <void> (0) : __assert_fail ("i_nocapture < OperandTraits<LandingPadInst>::operands(this) && \"setOperand() out of range!\"" , "/build/llvm-toolchain-snapshot-13~++20210405022414+5f57793c4fe4/llvm/include/llvm/IR/Instructions.h" , 2913, __PRETTY_FUNCTION__)); OperandTraits<LandingPadInst >::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned LandingPadInst::getNumOperands() const { return OperandTraits <LandingPadInst>::operands(this); } template <int Idx_nocapture > Use &LandingPadInst::Op() { return this->OpFrom< Idx_nocapture>(this); } template <int Idx_nocapture> const Use &LandingPadInst::Op() const { return this-> OpFrom<Idx_nocapture>(this); } |
| 2914 | |
| 2915 | //===----------------------------------------------------------------------===// |
| 2916 | // ReturnInst Class |
| 2917 | //===----------------------------------------------------------------------===// |
| 2918 | |
| 2919 | //===--------------------------------------------------------------------------- |
| 2920 | /// Return a value (possibly void), from a function. Execution |
| 2921 | /// does not continue in this function any longer. |
| 2922 | /// |
| 2923 | class ReturnInst : public Instruction { |
| 2924 | ReturnInst(const ReturnInst &RI); |
| 2925 | |
| 2926 | private: |
| 2927 | // ReturnInst constructors: |
| 2928 | // ReturnInst() - 'ret void' instruction |
| 2929 | // ReturnInst( null) - 'ret void' instruction |
| 2930 | // ReturnInst(Value* X) - 'ret X' instruction |
| 2931 | // ReturnInst( null, Inst *I) - 'ret void' instruction, insert before I |
| 2932 | // ReturnInst(Value* X, Inst *I) - 'ret X' instruction, insert before I |
| 2933 | // ReturnInst( null, BB *B) - 'ret void' instruction, insert @ end of B |
| 2934 | // ReturnInst(Value* X, BB *B) - 'ret X' instruction, insert @ end of B |
| 2935 | // |
| 2936 | // NOTE: If the Value* passed is of type void then the constructor behaves as |
| 2937 | // if it was passed NULL. |
| 2938 | explicit ReturnInst(LLVMContext &C, Value *retVal = nullptr, |
| 2939 | Instruction *InsertBefore = nullptr); |
| 2940 | ReturnInst(LLVMContext &C, Value *retVal, BasicBlock *InsertAtEnd); |
| 2941 | explicit ReturnInst(LLVMContext &C, BasicBlock *InsertAtEnd); |
| 2942 | |
| 2943 | protected: |
| 2944 | // Note: Instruction needs to be a friend here to call cloneImpl. |
| 2945 | friend class Instruction; |
| 2946 | |
| 2947 | ReturnInst *cloneImpl() const; |
| 2948 | |
| 2949 | public: |
| 2950 | static ReturnInst* Create(LLVMContext &C, Value *retVal = nullptr, |
| 2951 | Instruction *InsertBefore = nullptr) { |
| 2952 | return new(!!retVal) ReturnInst(C, retVal, InsertBefore); |
| 2953 | } |
| 2954 | |
| 2955 | static ReturnInst* Create(LLVMContext &C, Value *retVal, |
| 2956 | BasicBlock *InsertAtEnd) { |
| 2957 | return new(!!retVal) ReturnInst(C, retVal, InsertAtEnd); |
| 2958 | } |
| 2959 | |
| 2960 | static ReturnInst* Create(LLVMContext &C, BasicBlock *InsertAtEnd) { |
| 2961 | return new(0) ReturnInst(C, InsertAtEnd); |
| 2962 | } |
| 2963 | |
| 2964 | /// Provide fast operand accessors |
| 2965 | DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void setOperand(unsigned, Value*); inline op_iterator op_begin(); inline const_op_iterator op_begin() const; inline op_iterator op_end(); inline const_op_iterator op_end() const; protected : template <int> inline Use &Op(); template <int > inline const Use &Op() const; public: inline unsigned getNumOperands() const; |