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| //===- MemCpyOptimizer.h - memcpy optimization ------------------*- C++ -*-===//
//
// 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 performs various transformations related to eliminating memcpy
// calls, or transforming sets of stores into memset's.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
#define LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/PassManager.h"
#include <cstdint>
#include <functional>
namespace llvm {
class AssumptionCache;
class CallInst;
class DominatorTree;
class Function;
class Instruction;
class MemCpyInst;
class MemMoveInst;
class MemoryDependenceResults;
class MemSetInst;
class StoreInst;
class TargetLibraryInfo;
class Value;
class MemCpyOptPass : public PassInfoMixin<MemCpyOptPass> {
MemoryDependenceResults *MD = nullptr;
TargetLibraryInfo *TLI = nullptr;
std::function<AliasAnalysis &()> LookupAliasAnalysis;
std::function<AssumptionCache &()> LookupAssumptionCache;
std::function<DominatorTree &()> LookupDomTree;
public:
MemCpyOptPass() = default;
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
// Glue for the old PM.
bool runImpl(Function &F, MemoryDependenceResults *MD_,
TargetLibraryInfo *TLI_,
std::function<AliasAnalysis &()> LookupAliasAnalysis_,
std::function<AssumptionCache &()> LookupAssumptionCache_,
std::function<DominatorTree &()> LookupDomTree_);
private:
// Helper functions
bool processStore(StoreInst *SI, BasicBlock::iterator &BBI);
bool processMemSet(MemSetInst *SI, BasicBlock::iterator &BBI);
bool processMemCpy(MemCpyInst *M);
bool processMemMove(MemMoveInst *M);
bool performCallSlotOptzn(Instruction *cpy, Value *cpyDst, Value *cpySrc,
uint64_t cpyLen, unsigned cpyAlign, CallInst *C);
bool processMemCpyMemCpyDependence(MemCpyInst *M, MemCpyInst *MDep);
bool processMemSetMemCpyDependence(MemCpyInst *M, MemSetInst *MDep);
bool performMemCpyToMemSetOptzn(MemCpyInst *M, MemSetInst *MDep);
bool processByValArgument(CallSite CS, unsigned ArgNo);
Instruction *tryMergingIntoMemset(Instruction *I, Value *StartPtr,
Value *ByteVal);
bool iterateOnFunction(Function &F);
};
} // end namespace llvm
#endif // LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
|