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📄 ADCE.cpp(24.71 KB)
📄 AlignmentFromAssumptions.cpp(15.9 KB)
📄 BDCE.cpp(7.42 KB)
📄 CallSiteSplitting.cpp(21.43 KB)
📄 ConstantHoisting.cpp(38.95 KB)
📄 ConstantProp.cpp(4.13 KB)
📄 CorrelatedValuePropagation.cpp(32.36 KB)
📄 DCE.cpp(6.84 KB)
📄 DeadStoreElimination.cpp(91.51 KB)
📄 DivRemPairs.cpp(15.01 KB)
📄 EarlyCSE.cpp(57.05 KB)
📄 FlattenCFGPass.cpp(2.74 KB)
📄 Float2Int.cpp(18.19 KB)
📄 GVN.cpp(100.11 KB)
📄 GVNHoist.cpp(44.85 KB)
📄 GVNSink.cpp(29.97 KB)
📄 GuardWidening.cpp(32.36 KB)
📄 IVUsersPrinter.cpp(839 B)
📄 IndVarSimplify.cpp(113.49 KB)
📄 InductiveRangeCheckElimination.cpp(72.96 KB)
📄 InferAddressSpaces.cpp(44.22 KB)
📄 InstSimplifyPass.cpp(5.39 KB)
📄 JumpThreading.cpp(115.06 KB)
📄 LICM.cpp(92.71 KB)
📄 LoopAccessAnalysisPrinter.cpp(977 B)
📄 LoopDataPrefetch.cpp(14.54 KB)
📄 LoopDeletion.cpp(11.37 KB)
📄 LoopDistribute.cpp(40.25 KB)
📄 LoopFuse.cpp(68.6 KB)
📄 LoopIdiomRecognize.cpp(69.09 KB)
📄 LoopInstSimplify.cpp(9.38 KB)
📄 LoopInterchange.cpp(60.65 KB)
📄 LoopLoadElimination.cpp(26.71 KB)
📄 LoopPassManager.cpp(4.02 KB)
📄 LoopPredication.cpp(49.21 KB)
📄 LoopRerollPass.cpp(58.54 KB)
📄 LoopRotation.cpp(4.79 KB)
📄 LoopSimplifyCFG.cpp(28.59 KB)
📄 LoopSink.cpp(14.93 KB)
📄 LoopStrengthReduce.cpp(216.88 KB)
📄 LoopUnrollAndJamPass.cpp(21.07 KB)
📄 LoopUnrollPass.cpp(60.73 KB)
📄 LoopUnswitch.cpp(64.17 KB)
📄 LoopVersioningLICM.cpp(23.65 KB)
📄 LowerAtomic.cpp(5.12 KB)
📄 LowerConstantIntrinsics.cpp(5.8 KB)
📄 LowerExpectIntrinsic.cpp(15 KB)
📄 LowerGuardIntrinsic.cpp(2.82 KB)
📄 LowerMatrixIntrinsics.cpp(73.36 KB)
📄 LowerWidenableCondition.cpp(2.75 KB)
📄 MakeGuardsExplicit.cpp(3.83 KB)
📄 MemCpyOptimizer.cpp(52.16 KB)
📄 MergeICmps.cpp(35.61 KB)
📄 MergedLoadStoreMotion.cpp(15.18 KB)
📄 NaryReassociate.cpp(19.86 KB)
📄 NewGVN.cpp(170.95 KB)
📄 PartiallyInlineLibCalls.cpp(6.22 KB)
📄 PlaceSafepoints.cpp(27.5 KB)
📄 Reassociate.cpp(95.61 KB)
📄 Reg2Mem.cpp(4.34 KB)
📄 RewriteStatepointsForGC.cpp(116.35 KB)
📄 SCCP.cpp(76.12 KB)
📄 SROA.cpp(183.83 KB)
📄 Scalar.cpp(10.08 KB)
📄 Scalarizer.cpp(32.93 KB)
📄 SeparateConstOffsetFromGEP.cpp(52.99 KB)
📄 SimpleLoopUnswitch.cpp(124.57 KB)
📄 SimplifyCFGPass.cpp(12.31 KB)
📄 Sink.cpp(10.81 KB)
📄 SpeculateAroundPHIs.cpp(35.69 KB)
📄 SpeculativeExecution.cpp(11.54 KB)
📄 StraightLineStrengthReduce.cpp(28.92 KB)
📄 StructurizeCFG.cpp(32.49 KB)
📄 TailRecursionElimination.cpp(34.9 KB)
📄 WarnMissedTransforms.cpp(6.14 KB)

Editing: InstSimplifyPass.cpp

//===- InstSimplifyPass.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Scalar/InstSimplifyPass.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Type.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/Utils.h"
#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;

#define DEBUG_TYPE "instsimplify"

STATISTIC(NumSimplified, "Number of redundant instructions removed");

static bool runImpl(Function &F, const SimplifyQuery &SQ,
                    OptimizationRemarkEmitter *ORE) {
  SmallPtrSet<const Instruction *, 8> S1, S2, *ToSimplify = &S1, *Next = &S2;
  bool Changed = false;

do {
    for (BasicBlock &BB : F) {
      // Unreachable code can take on strange forms that we are not prepared to
      // handle. For example, an instruction may have itself as an operand.
      if (!SQ.DT->isReachableFromEntry(&BB))
        continue;

SmallVector<WeakTrackingVH, 8> DeadInstsInBB;
      for (Instruction &I : BB) {
        // The first time through the loop, ToSimplify is empty and we try to
        // simplify all instructions. On later iterations, ToSimplify is not
        // empty and we only bother simplifying instructions that are in it.
        if (!ToSimplify->empty() && !ToSimplify->count(&I))
          continue;

// Don't waste time simplifying dead/unused instructions.
        if (isInstructionTriviallyDead(&I)) {
          DeadInstsInBB.push_back(&I);
          Changed = true;
        } else if (!I.use_empty()) {
          if (Value *V = SimplifyInstruction(&I, SQ, ORE)) {
            // Mark all uses for resimplification next time round the loop.
            for (User *U : I.users())
              Next->insert(cast<Instruction>(U));
            I.replaceAllUsesWith(V);
            ++NumSimplified;
            Changed = true;
            // A call can get simplified, but it may not be trivially dead.
            if (isInstructionTriviallyDead(&I))
              DeadInstsInBB.push_back(&I);
          }
        }
      }
      RecursivelyDeleteTriviallyDeadInstructions(DeadInstsInBB, SQ.TLI);
    }

// Place the list of instructions to simplify on the next loop iteration
    // into ToSimplify.
    std::swap(ToSimplify, Next);
    Next->clear();
  } while (!ToSimplify->empty());

return Changed;
}

namespace {
struct InstSimplifyLegacyPass : public FunctionPass {
  static char ID; // Pass identification, replacement for typeid
  InstSimplifyLegacyPass() : FunctionPass(ID) {
    initializeInstSimplifyLegacyPassPass(*PassRegistry::getPassRegistry());
  }

void getAnalysisUsage(AnalysisUsage &AU) const override {
    AU.setPreservesCFG();
    AU.addRequired<DominatorTreeWrapperPass>();
    AU.addRequired<AssumptionCacheTracker>();
    AU.addRequired<TargetLibraryInfoWrapperPass>();
    AU.addRequired<OptimizationRemarkEmitterWrapperPass>();
  }

/// Remove instructions that simplify.
  bool runOnFunction(Function &F) override {
    if (skipFunction(F))
      return false;

const DominatorTree *DT =
        &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
    const TargetLibraryInfo *TLI =
        &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
    AssumptionCache *AC =
        &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
    OptimizationRemarkEmitter *ORE =
        &getAnalysis<OptimizationRemarkEmitterWrapperPass>().getORE();
    const DataLayout &DL = F.getParent()->getDataLayout();
    const SimplifyQuery SQ(DL, TLI, DT, AC);
    return runImpl(F, SQ, ORE);
  }
};
} // namespace

char InstSimplifyLegacyPass::ID = 0;
INITIALIZE_PASS_BEGIN(InstSimplifyLegacyPass, "instsimplify",
                      "Remove redundant instructions", false, false)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(OptimizationRemarkEmitterWrapperPass)
INITIALIZE_PASS_END(InstSimplifyLegacyPass, "instsimplify",
                    "Remove redundant instructions", false, false)

// Public interface to the simplify instructions pass.
FunctionPass *llvm::createInstSimplifyLegacyPass() {
  return new InstSimplifyLegacyPass();
}

PreservedAnalyses InstSimplifyPass::run(Function &F,
                                        FunctionAnalysisManager &AM) {
  auto &DT = AM.getResult<DominatorTreeAnalysis>(F);
  auto &TLI = AM.getResult<TargetLibraryAnalysis>(F);
  auto &AC = AM.getResult<AssumptionAnalysis>(F);
  auto &ORE = AM.getResult<OptimizationRemarkEmitterAnalysis>(F);
  const DataLayout &DL = F.getParent()->getDataLayout();
  const SimplifyQuery SQ(DL, &TLI, &DT, &AC);
  bool Changed = runImpl(F, SQ, &ORE);
  if (!Changed)
    return PreservedAnalyses::all();

PreservedAnalyses PA;
  PA.preserveSet<CFGAnalyses>();
  return PA;
}

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Editing: InstSimplifyPass.cpp

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