1 //===- SimplifyLibCalls.h - Library call simplifier -------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file exposes an interface to build some C language libcalls for
11 // optimization passes that need to call the various functions.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H
16 #define LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/IR/IRBuilder.h"
26 class TargetLibraryInfo;
30 /// LibCallSimplifier - This class implements a collection of optimizations
31 /// that replace well formed calls to library functions with a more optimal
32 /// form. For example, replacing 'printf("Hello!")' with 'puts("Hello!")'.
33 class LibCallSimplifier {
36 const TargetLibraryInfo *TLI;
40 ~LibCallSimplifier() {}
43 LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI,
46 /// ~LibCallSimplifier - Adding the virtual destructor back in to satisfy
47 /// -Wnon-virtual-dtor. This class is used polymorphically by InstCombine.
48 virtual ~LibCallSimplifier() {}
50 /// optimizeCall - Take the given call instruction and return a more
51 /// optimal value to replace the instruction with or 0 if a more
52 /// optimal form can't be found. Note that the returned value may
53 /// be equal to the instruction being optimized. In this case all
54 /// other instructions that use the given instruction were modified
55 /// and the given instruction is dead.
56 Value *optimizeCall(CallInst *CI);
58 /// replaceAllUsesWith - This method is used when the library call
59 /// simplifier needs to replace instructions other than the library
60 /// call being modified.
61 virtual void replaceAllUsesWith(Instruction *I, Value *With) const;
64 // Fortified Library Call Optimizations
65 Value *optimizeMemCpyChk(CallInst *CI, IRBuilder<> &B);
66 Value *optimizeMemMoveChk(CallInst *CI, IRBuilder<> &B);
67 Value *optimizeMemSetChk(CallInst *CI, IRBuilder<> &B);
68 Value *optimizeStrCpyChk(CallInst *CI, IRBuilder<> &B);
69 Value *optimizeStpCpyChk(CallInst *CI, IRBuilder<> &B);
70 Value *optimizeStrNCpyChk(CallInst *CI, IRBuilder<> &B);
72 // String and Memory Library Call Optimizations
73 Value *optimizeStrCat(CallInst *CI, IRBuilder<> &B);
74 Value *optimizeStrNCat(CallInst *CI, IRBuilder<> &B);
75 Value *optimizeStrChr(CallInst *CI, IRBuilder<> &B);
76 Value *optimizeStrRChr(CallInst *CI, IRBuilder<> &B);
77 Value *optimizeStrCmp(CallInst *CI, IRBuilder<> &B);
78 Value *optimizeStrNCmp(CallInst *CI, IRBuilder<> &B);
79 Value *optimizeStrCpy(CallInst *CI, IRBuilder<> &B);
80 Value *optimizeStpCpy(CallInst *CI, IRBuilder<> &B);
81 Value *optimizeStrNCpy(CallInst *CI, IRBuilder<> &B);
82 Value *optimizeStrLen(CallInst *CI, IRBuilder<> &B);
83 Value *optimizeStrPBrk(CallInst *CI, IRBuilder<> &B);
84 Value *optimizeStrTo(CallInst *CI, IRBuilder<> &B);
85 Value *optimizeStrSpn(CallInst *CI, IRBuilder<> &B);
86 Value *optimizeStrCSpn(CallInst *CI, IRBuilder<> &B);
87 Value *optimizeStrStr(CallInst *CI, IRBuilder<> &B);
88 Value *optimizeMemCmp(CallInst *CI, IRBuilder<> &B);
89 Value *optimizeMemCpy(CallInst *CI, IRBuilder<> &B);
90 Value *optimizeMemMove(CallInst *CI, IRBuilder<> &B);
91 Value *optimizeMemSet(CallInst *CI, IRBuilder<> &B);
93 // Math Library Optimizations
94 Value *optimizeUnaryDoubleFP(CallInst *CI, IRBuilder<> &B, bool CheckRetType);
95 Value *optimizeBinaryDoubleFP(CallInst *CI, IRBuilder<> &B);
96 Value *optimizeCos(CallInst *CI, IRBuilder<> &B);
97 Value *optimizePow(CallInst *CI, IRBuilder<> &B);
98 Value *optimizeExp2(CallInst *CI, IRBuilder<> &B);
99 Value *optimizeSinCosPi(CallInst *CI, IRBuilder<> &B);
101 // Integer Library Call Optimizations
102 Value *optimizeFFS(CallInst *CI, IRBuilder<> &B);
103 Value *optimizeAbs(CallInst *CI, IRBuilder<> &B);
104 Value *optimizeIsDigit(CallInst *CI, IRBuilder<> &B);
105 Value *optimizeIsAscii(CallInst *CI, IRBuilder<> &B);
106 Value *optimizeToAscii(CallInst *CI, IRBuilder<> &B);
108 // Formatting and IO Library Call Optimizations
109 Value *optimizeErrorReporting(CallInst *CI, IRBuilder<> &B,
111 Value *optimizePrintF(CallInst *CI, IRBuilder<> &B);
112 Value *optimizeSPrintF(CallInst *CI, IRBuilder<> &B);
113 Value *optimizeFPrintF(CallInst *CI, IRBuilder<> &B);
114 Value *optimizeFWrite(CallInst *CI, IRBuilder<> &B);
115 Value *optimizeFPuts(CallInst *CI, IRBuilder<> &B);
116 Value *optimizePuts(CallInst *CI, IRBuilder<> &B);
119 Value *emitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B);
120 void classifyArgUse(Value *Val, BasicBlock *BB, bool IsFloat,
121 SmallVectorImpl<CallInst *> &SinCalls,
122 SmallVectorImpl<CallInst *> &CosCalls,
123 SmallVectorImpl<CallInst *> &SinCosCalls);
124 void replaceTrigInsts(SmallVectorImpl<CallInst *> &Calls, Value *Res);
125 Value *optimizePrintFString(CallInst *CI, IRBuilder<> &B);
126 Value *optimizeSPrintFString(CallInst *CI, IRBuilder<> &B);
127 Value *optimizeFPrintFString(CallInst *CI, IRBuilder<> &B);
129 /// hasFloatVersion - Checks if there is a float version of the specified
130 /// function by checking for an existing function with name FuncName + f
131 bool hasFloatVersion(StringRef FuncName);
133 } // End llvm namespace