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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===- 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/Analysis/AliasAnalysis.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/CallSite.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 AssumptionCache;
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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 MemCpyInst;
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class MemMoveInst;
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class MemoryDependenceResults;
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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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std::function<AliasAnalysis &()> LookupAliasAnalysis;
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std::function<AssumptionCache &()> LookupAssumptionCache;
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std::function<DominatorTree &()> LookupDomTree;
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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_,
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TargetLibraryInfo *TLI_,
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std::function<AliasAnalysis &()> LookupAliasAnalysis_,
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std::function<AssumptionCache &()> LookupAssumptionCache_,
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std::function<DominatorTree &()> LookupDomTree_);
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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);
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bool processMemMove(MemMoveInst *M);
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bool performCallSlotOptzn(Instruction *cpy, Value *cpyDst, Value *cpySrc,
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uint64_t cpyLen, unsigned cpyAlign, CallInst *C);
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bool processMemCpyMemCpyDependence(MemCpyInst *M, MemCpyInst *MDep);
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bool processMemSetMemCpyDependence(MemCpyInst *M, MemSetInst *MDep);
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bool performMemCpyToMemSetOptzn(MemCpyInst *M, MemSetInst *MDep);
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bool processByValArgument(CallSite CS, unsigned ArgNo);
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Instruction *tryMergingIntoMemset(Instruction *I, Value *StartPtr,
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Value *ByteVal);
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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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