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📄 AMDGPUEmitPrintf.cpp(8.57 KB)
📄 ASanStackFrameLayout.cpp(5.75 KB)
📄 AddDiscriminators.cpp(10.78 KB)
📄 AssumeBundleBuilder.cpp(21.46 KB)
📄 BasicBlockUtils.cpp(51.81 KB)
📄 BreakCriticalEdges.cpp(19.03 KB)
📄 BuildLibCalls.cpp(43.9 KB)
📄 BypassSlowDivision.cpp(17.95 KB)
📄 CallGraphUpdater.cpp(5.76 KB)
📄 CallPromotionUtils.cpp(22.18 KB)
📄 CanonicalizeAliases.cpp(3.18 KB)
📄 CanonicalizeFreezeInLoops.cpp(7.93 KB)
📄 CloneFunction.cpp(34.49 KB)
📄 CloneModule.cpp(7.93 KB)
📄 CodeExtractor.cpp(65.69 KB)
📄 CodeMoverUtils.cpp(15.82 KB)
📄 CtorUtils.cpp(5.1 KB)
📄 Debugify.cpp(17.78 KB)
📄 DemoteRegToStack.cpp(6.1 KB)
📄 EntryExitInstrumenter.cpp(5.83 KB)
📄 EscapeEnumerator.cpp(2.96 KB)
📄 Evaluator.cpp(27.98 KB)
📄 FixIrreducible.cpp(12.68 KB)
📄 FlattenCFG.cpp(16.99 KB)
📄 FunctionComparator.cpp(34.36 KB)
📄 FunctionImportUtils.cpp(13.8 KB)
📄 GlobalStatus.cpp(7.23 KB)
📄 GuardUtils.cpp(4.76 KB)
📄 ImportedFunctionsInliningStatistics.cpp(7.67 KB)
📄 InjectTLIMappings.cpp(6.62 KB)
📄 InlineFunction.cpp(103.28 KB)
📄 InstructionNamer.cpp(1.98 KB)
📄 IntegerDivision.cpp(26.17 KB)
📄 LCSSA.cpp(18.72 KB)
📄 LibCallsShrinkWrap.cpp(18.68 KB)
📄 Local.cpp(114.96 KB)
📄 LoopRotationUtils.cpp(29.47 KB)
📄 LoopSimplify.cpp(36.13 KB)
📄 LoopUnroll.cpp(38.07 KB)
📄 LoopUnrollAndJam.cpp(37.71 KB)
📄 LoopUnrollPeel.cpp(31.88 KB)
📄 LoopUnrollRuntime.cpp(40.17 KB)
📄 LoopUtils.cpp(65.03 KB)
📄 LoopVersioning.cpp(12.42 KB)
📄 LowerInvoke.cpp(3.3 KB)
📄 LowerMemIntrinsics.cpp(20.41 KB)
📄 LowerSwitch.cpp(23.46 KB)
📄 Mem2Reg.cpp(3.71 KB)
📄 MetaRenamer.cpp(5.29 KB)
📄 MisExpect.cpp(6.97 KB)
📄 ModuleUtils.cpp(10.99 KB)
📄 NameAnonGlobals.cpp(3.33 KB)
📄 PredicateInfo.cpp(36.79 KB)
📄 PromoteMemoryToRegister.cpp(37.26 KB)
📄 SSAUpdater.cpp(16.72 KB)
📄 SSAUpdaterBulk.cpp(7.46 KB)
📄 SanitizerStats.cpp(4.08 KB)
📄 ScalarEvolutionExpander.cpp(101.25 KB)
📄 SimplifyCFG.cpp(238.13 KB)
📄 SimplifyIndVar.cpp(34.53 KB)
📄 SimplifyLibCalls.cpp(122.25 KB)
📄 SizeOpts.cpp(5.08 KB)
📄 SplitModule.cpp(9.67 KB)
📄 StripGCRelocates.cpp(2.86 KB)
📄 StripNonLineTableDebugInfo.cpp(1.4 KB)
📄 SymbolRewriter.cpp(18.82 KB)
📄 UnifyFunctionExitNodes.cpp(4.42 KB)
📄 UnifyLoopExits.cpp(8.16 KB)
📄 UniqueInternalLinkageNames.cpp(2.91 KB)
📄 Utils.cpp(2.53 KB)
📄 VNCoercion.cpp(25.89 KB)
📄 ValueMapper.cpp(38.06 KB)

Editing: Mem2Reg.cpp

//===- Mem2Reg.cpp - The -mem2reg pass, a wrapper around the Utils lib ----===//
//
// 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 is a simple pass wrapper around the PromoteMemToReg function call
// exposed by the Utils library.
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Utils/Mem2Reg.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/PassManager.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Transforms/Utils.h"
#include "llvm/Transforms/Utils/PromoteMemToReg.h"
#include <vector>

using namespace llvm;

#define DEBUG_TYPE "mem2reg"

STATISTIC(NumPromoted, "Number of alloca's promoted");

static bool promoteMemoryToRegister(Function &F, DominatorTree &DT,
                                    AssumptionCache &AC) {
  std::vector<AllocaInst *> Allocas;
  BasicBlock &BB = F.getEntryBlock(); // Get the entry node for the function
  bool Changed = false;

while (true) {
    Allocas.clear();

// Find allocas that are safe to promote, by looking at all instructions in
    // the entry node
    for (BasicBlock::iterator I = BB.begin(), E = --BB.end(); I != E; ++I)
      if (AllocaInst *AI = dyn_cast<AllocaInst>(I)) // Is it an alloca?
        if (isAllocaPromotable(AI))
          Allocas.push_back(AI);

if (Allocas.empty())
      break;

PromoteMemToReg(Allocas, DT, &AC);
    NumPromoted += Allocas.size();
    Changed = true;
  }
  return Changed;
}

PreservedAnalyses PromotePass::run(Function &F, FunctionAnalysisManager &AM) {
  auto &DT = AM.getResult<DominatorTreeAnalysis>(F);
  auto &AC = AM.getResult<AssumptionAnalysis>(F);
  if (!promoteMemoryToRegister(F, DT, AC))
    return PreservedAnalyses::all();

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

namespace {

struct PromoteLegacyPass : public FunctionPass {
  // Pass identification, replacement for typeid
  static char ID;

PromoteLegacyPass() : FunctionPass(ID) {
    initializePromoteLegacyPassPass(*PassRegistry::getPassRegistry());
  }

// runOnFunction - To run this pass, first we calculate the alloca
  // instructions that are safe for promotion, then we promote each one.
  bool runOnFunction(Function &F) override {
    if (skipFunction(F))
      return false;

DominatorTree &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
    AssumptionCache &AC =
        getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
    return promoteMemoryToRegister(F, DT, AC);
  }

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

} // end anonymous namespace

char PromoteLegacyPass::ID = 0;

INITIALIZE_PASS_BEGIN(PromoteLegacyPass, "mem2reg", "Promote Memory to "
                                                    "Register",
                      false, false)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_END(PromoteLegacyPass, "mem2reg", "Promote Memory to Register",
                    false, false)

// createPromoteMemoryToRegister - Provide an entry point to create this pass.
FunctionPass *llvm::createPromoteMemoryToRegisterPass() {
  return new PromoteLegacyPass();
}

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Editing: Mem2Reg.cpp

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