85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
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//===- MemCpyOptimizer.h - memcpy optimization ------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass performs various transformations related to eliminating memcpy
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// calls, or transforming sets of stores into memset's.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
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#define LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/PassManager.h"
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#include <cstdint>
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#include <functional>
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namespace llvm {
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class AAResults;
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class AssumptionCache;
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class CallBase;
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class CallInst;
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class DominatorTree;
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class Function;
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class Instruction;
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class LoadInst;
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class MemCpyInst;
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class MemMoveInst;
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class MemoryDependenceResults;
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class MemorySSA;
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class MemorySSAUpdater;
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class MemSetInst;
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class StoreInst;
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class TargetLibraryInfo;
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class Value;
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class MemCpyOptPass : public PassInfoMixin<MemCpyOptPass> {
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MemoryDependenceResults *MD = nullptr;
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TargetLibraryInfo *TLI = nullptr;
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AAResults *AA = nullptr;
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AssumptionCache *AC = nullptr;
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DominatorTree *DT = nullptr;
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MemorySSA *MSSA = nullptr;
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MemorySSAUpdater *MSSAU = nullptr;
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public:
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MemCpyOptPass() = default;
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PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
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// Glue for the old PM.
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bool runImpl(Function &F, MemoryDependenceResults *MD, TargetLibraryInfo *TLI,
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AAResults *AA, AssumptionCache *AC, DominatorTree *DT,
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MemorySSA *MSSA);
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private:
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// Helper functions
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bool processStore(StoreInst *SI, BasicBlock::iterator &BBI);
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bool processMemSet(MemSetInst *SI, BasicBlock::iterator &BBI);
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bool processMemCpy(MemCpyInst *M, BasicBlock::iterator &BBI);
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bool processMemMove(MemMoveInst *M);
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bool performCallSlotOptzn(Instruction *cpyLoad, Instruction *cpyStore,
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Value *cpyDst, Value *cpySrc, uint64_t cpyLen,
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Align cpyAlign, CallInst *C);
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bool processMemCpyMemCpyDependence(MemCpyInst *M, MemCpyInst *MDep);
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bool processMemSetMemCpyDependence(MemCpyInst *MemCpy, MemSetInst *MemSet);
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bool performMemCpyToMemSetOptzn(MemCpyInst *MemCpy, MemSetInst *MemSet);
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bool processByValArgument(CallBase &CB, unsigned ArgNo);
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Instruction *tryMergingIntoMemset(Instruction *I, Value *StartPtr,
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Value *ByteVal);
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bool moveUp(StoreInst *SI, Instruction *P, const LoadInst *LI);
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void eraseInstruction(Instruction *I);
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bool iterateOnFunction(Function &F);
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};
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
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