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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: LowerConstantIntrinsics.cpp

//===- LowerConstantIntrinsics.cpp - Lower constant intrinsic calls -------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This pass lowers all remaining 'objectsize' 'is.constant' intrinsic calls
// and provides constant propagation and basic CFG cleanup on the result.
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Scalar/LowerConstantIntrinsics.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/Local.h"

using namespace llvm;
using namespace llvm::PatternMatch;

#define DEBUG_TYPE "lower-is-constant-intrinsic"

STATISTIC(IsConstantIntrinsicsHandled,
          "Number of 'is.constant' intrinsic calls handled");
STATISTIC(ObjectSizeIntrinsicsHandled,
          "Number of 'objectsize' intrinsic calls handled");

static Value *lowerIsConstantIntrinsic(IntrinsicInst *II) {
  Value *Op = II->getOperand(0);

return isa<Constant>(Op) ? ConstantInt::getTrue(II->getType())
                           : ConstantInt::getFalse(II->getType());
}

static bool replaceConditionalBranchesOnConstant(Instruction *II,
                                                 Value *NewValue) {
  bool HasDeadBlocks = false;
  SmallSetVector<Instruction *, 8> Worklist;
  replaceAndRecursivelySimplify(II, NewValue, nullptr, nullptr, nullptr,
                                &Worklist);
  for (auto I : Worklist) {
    BranchInst *BI = dyn_cast<BranchInst>(I);
    if (!BI)
      continue;
    if (BI->isUnconditional())
      continue;

BasicBlock *Target, *Other;
    if (match(BI->getOperand(0), m_Zero())) {
      Target = BI->getSuccessor(1);
      Other = BI->getSuccessor(0);
    } else if (match(BI->getOperand(0), m_One())) {
      Target = BI->getSuccessor(0);
      Other = BI->getSuccessor(1);
    } else {
      Target = nullptr;
      Other = nullptr;
    }
    if (Target && Target != Other) {
      BasicBlock *Source = BI->getParent();
      Other->removePredecessor(Source);
      BI->eraseFromParent();
      BranchInst::Create(Target, Source);
      if (pred_begin(Other) == pred_end(Other))
        HasDeadBlocks = true;
    }
  }
  return HasDeadBlocks;
}

static bool lowerConstantIntrinsics(Function &F, const TargetLibraryInfo *TLI) {
  bool HasDeadBlocks = false;
  const auto &DL = F.getParent()->getDataLayout();
  SmallVector<WeakTrackingVH, 8> Worklist;

ReversePostOrderTraversal<Function *> RPOT(&F);
  for (BasicBlock *BB : RPOT) {
    for (Instruction &I: *BB) {
      IntrinsicInst *II = dyn_cast<IntrinsicInst>(&I);
      if (!II)
        continue;
      switch (II->getIntrinsicID()) {
      default:
        break;
      case Intrinsic::is_constant:
      case Intrinsic::objectsize:
        Worklist.push_back(WeakTrackingVH(&I));
        break;
      }
    }
  }
  for (WeakTrackingVH &VH: Worklist) {
    // Items on the worklist can be mutated by earlier recursive replaces.
    // This can remove the intrinsic as dead (VH == null), but also replace
    // the intrinsic in place.
    if (!VH)
      continue;
    IntrinsicInst *II = dyn_cast<IntrinsicInst>(&*VH);
    if (!II)
      continue;
    Value *NewValue;
    switch (II->getIntrinsicID()) {
    default:
      continue;
    case Intrinsic::is_constant:
      NewValue = lowerIsConstantIntrinsic(II);
      IsConstantIntrinsicsHandled++;
      break;
    case Intrinsic::objectsize:
      NewValue = lowerObjectSizeCall(II, DL, TLI, true);
      ObjectSizeIntrinsicsHandled++;
      break;
    }
    HasDeadBlocks |= replaceConditionalBranchesOnConstant(II, NewValue);
  }
  if (HasDeadBlocks)
    removeUnreachableBlocks(F);
  return !Worklist.empty();
}

PreservedAnalyses
LowerConstantIntrinsicsPass::run(Function &F, FunctionAnalysisManager &AM) {
  if (lowerConstantIntrinsics(F,
                              AM.getCachedResult<TargetLibraryAnalysis>(F))) {
    PreservedAnalyses PA;
    PA.preserve<GlobalsAA>();
    return PA;
  }

return PreservedAnalyses::all();
}

namespace {
/// Legacy pass for lowering is.constant intrinsics out of the IR.
///
/// When this pass is run over a function it converts is.constant intrinsics
/// into 'true' or 'false'. This complements the normal constant folding
/// to 'true' as part of Instruction Simplify passes.
class LowerConstantIntrinsics : public FunctionPass {
public:
  static char ID;
  LowerConstantIntrinsics() : FunctionPass(ID) {
    initializeLowerConstantIntrinsicsPass(*PassRegistry::getPassRegistry());
  }

bool runOnFunction(Function &F) override {
    auto *TLIP = getAnalysisIfAvailable<TargetLibraryInfoWrapperPass>();
    const TargetLibraryInfo *TLI = TLIP ? &TLIP->getTLI(F) : nullptr;
    return lowerConstantIntrinsics(F, TLI);
  }

void getAnalysisUsage(AnalysisUsage &AU) const override {
    AU.addPreserved<GlobalsAAWrapperPass>();
  }
};
} // namespace

char LowerConstantIntrinsics::ID = 0;
INITIALIZE_PASS(LowerConstantIntrinsics, "lower-constant-intrinsics",
                "Lower constant intrinsics", false, false)

FunctionPass *llvm::createLowerConstantIntrinsicsPass() {
  return new LowerConstantIntrinsics();
}

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Editing: LowerConstantIntrinsics.cpp

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