1 //===- MemCpyOptimizer.h - memcpy optimization ------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This pass performs various transformations related to eliminating memcpy 11 // calls, or transforming sets of stores into memset's. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H 16 #define LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H 17 18 #include "llvm/Analysis/AliasAnalysis.h" 19 #include "llvm/IR/BasicBlock.h" 20 #include "llvm/IR/CallSite.h" 21 #include "llvm/IR/PassManager.h" 22 #include <cstdint> 23 #include <functional> 24 25 namespace llvm { 26 27 class AssumptionCache; 28 class CallInst; 29 class DominatorTree; 30 class Function; 31 class Instruction; 32 class MemCpyInst; 33 class MemMoveInst; 34 class MemoryDependenceResults; 35 class MemSetInst; 36 class StoreInst; 37 class TargetLibraryInfo; 38 class Value; 39 40 class MemCpyOptPass : public PassInfoMixin<MemCpyOptPass> { 41 MemoryDependenceResults *MD = nullptr; 42 TargetLibraryInfo *TLI = nullptr; 43 std::function<AliasAnalysis &()> LookupAliasAnalysis; 44 std::function<AssumptionCache &()> LookupAssumptionCache; 45 std::function<DominatorTree &()> LookupDomTree; 46 47 public: 48 MemCpyOptPass() = default; 49 50 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); 51 52 // Glue for the old PM. 53 bool runImpl(Function &F, MemoryDependenceResults *MD_, 54 TargetLibraryInfo *TLI_, 55 std::function<AliasAnalysis &()> LookupAliasAnalysis_, 56 std::function<AssumptionCache &()> LookupAssumptionCache_, 57 std::function<DominatorTree &()> LookupDomTree_); 58 59 private: 60 // Helper functions 61 bool processStore(StoreInst *SI, BasicBlock::iterator &BBI); 62 bool processMemSet(MemSetInst *SI, BasicBlock::iterator &BBI); 63 bool processMemCpy(MemCpyInst *M); 64 bool processMemMove(MemMoveInst *M); 65 bool performCallSlotOptzn(Instruction *cpy, Value *cpyDst, Value *cpySrc, 66 uint64_t cpyLen, unsigned cpyAlign, CallInst *C); 67 bool processMemCpyMemCpyDependence(MemCpyInst *M, MemCpyInst *MDep); 68 bool processMemSetMemCpyDependence(MemCpyInst *M, MemSetInst *MDep); 69 bool performMemCpyToMemSetOptzn(MemCpyInst *M, MemSetInst *MDep); 70 bool processByValArgument(CallSite CS, unsigned ArgNo); 71 Instruction *tryMergingIntoMemset(Instruction *I, Value *StartPtr, 72 Value *ByteVal); 73 74 bool iterateOnFunction(Function &F); 75 }; 76 77 } // end namespace llvm 78 79 #endif // LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H 80
