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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- MemCpyOptimizer.h - memcpy optimization ------------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This pass performs various transformations related to eliminating memcpy |
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| 10 | // calls, or transforming sets of stores into memset's. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |||
| 14 | #ifndef LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H |
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| 15 | #define LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H |
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| 16 | |||
| 17 | #include "llvm/IR/BasicBlock.h" |
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| 18 | #include "llvm/IR/PassManager.h" |
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| 19 | |||
| 20 | namespace llvm { |
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| 21 | |||
| 22 | class AAResults; |
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| 23 | class BatchAAResults; |
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| 24 | class AssumptionCache; |
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| 25 | class CallBase; |
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| 26 | class CallInst; |
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| 27 | class DominatorTree; |
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| 28 | class Function; |
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| 29 | class Instruction; |
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| 30 | class LoadInst; |
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| 31 | class MemCpyInst; |
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| 32 | class MemMoveInst; |
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| 33 | class MemorySSA; |
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| 34 | class MemorySSAUpdater; |
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| 35 | class MemSetInst; |
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| 36 | class StoreInst; |
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| 37 | class TargetLibraryInfo; |
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| 38 | class Value; |
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| 39 | |||
| 40 | class MemCpyOptPass : public PassInfoMixin<MemCpyOptPass> { |
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| 41 | TargetLibraryInfo *TLI = nullptr; |
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| 42 | AAResults *AA = nullptr; |
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| 43 | AssumptionCache *AC = nullptr; |
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| 44 | DominatorTree *DT = nullptr; |
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| 45 | MemorySSA *MSSA = nullptr; |
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| 46 | MemorySSAUpdater *MSSAU = nullptr; |
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| 47 | |||
| 48 | public: |
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| 49 | MemCpyOptPass() = default; |
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| 50 | |||
| 51 | PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); |
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| 52 | |||
| 53 | // Glue for the old PM. |
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| 54 | bool runImpl(Function &F, TargetLibraryInfo *TLI, AAResults *AA, |
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| 55 | AssumptionCache *AC, DominatorTree *DT, MemorySSA *MSSA); |
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| 56 | |||
| 57 | private: |
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| 58 | // Helper functions |
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| 59 | bool processStore(StoreInst *SI, BasicBlock::iterator &BBI); |
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| 60 | bool processStoreOfLoad(StoreInst *SI, LoadInst *LI, const DataLayout &DL, |
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| 61 | BasicBlock::iterator &BBI); |
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| 62 | bool processMemSet(MemSetInst *SI, BasicBlock::iterator &BBI); |
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| 63 | bool processMemCpy(MemCpyInst *M, BasicBlock::iterator &BBI); |
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| 64 | bool processMemMove(MemMoveInst *M); |
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| 65 | bool performCallSlotOptzn(Instruction *cpyLoad, Instruction *cpyStore, |
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| 66 | Value *cpyDst, Value *cpySrc, TypeSize cpyLen, |
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| 67 | Align cpyAlign, BatchAAResults &BAA, |
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| 68 | std::function<CallInst *()> GetC); |
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| 69 | bool processMemCpyMemCpyDependence(MemCpyInst *M, MemCpyInst *MDep, |
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| 70 | BatchAAResults &BAA); |
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| 71 | bool processMemSetMemCpyDependence(MemCpyInst *MemCpy, MemSetInst *MemSet, |
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| 72 | BatchAAResults &BAA); |
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| 73 | bool performMemCpyToMemSetOptzn(MemCpyInst *MemCpy, MemSetInst *MemSet, |
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| 74 | BatchAAResults &BAA); |
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| 75 | bool processByValArgument(CallBase &CB, unsigned ArgNo); |
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| 76 | Instruction *tryMergingIntoMemset(Instruction *I, Value *StartPtr, |
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| 77 | Value *ByteVal); |
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| 78 | bool moveUp(StoreInst *SI, Instruction *P, const LoadInst *LI); |
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| 79 | |||
| 80 | void eraseInstruction(Instruction *I); |
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| 81 | bool iterateOnFunction(Function &F); |
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| 82 | }; |
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| 83 | |||
| 84 | } // end namespace llvm |
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| 85 | |||
| 86 | #endif // LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H |