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 /// \brief This class implements simplifications for calls to fortified library
31 /// functions (__st*cpy_chk, __memcpy_chk, __memmove_chk, __memset_chk), to,
32 /// when possible, replace them with their non-checking counterparts.
33 /// Other optimizations can also be done, but it's possible to disable them and
34 /// only simplify needless use of the checking versions (when the object size
35 /// is unknown) by passing true for OnlyLowerUnknownSize.
36 class FortifiedLibCallSimplifier {
39 const TargetLibraryInfo *TLI;
40 bool OnlyLowerUnknownSize;
43 FortifiedLibCallSimplifier(const DataLayout *DL, const TargetLibraryInfo *TLI,
44 bool OnlyLowerUnknownSize = false);
46 /// \brief Take the given call instruction and return a more
47 /// optimal value to replace the instruction with or 0 if a more
48 /// optimal form can't be found.
49 /// The call must not be an indirect call.
50 Value *optimizeCall(CallInst *CI);
53 Value *optimizeMemCpyChk(CallInst *CI, IRBuilder<> &B);
54 Value *optimizeMemMoveChk(CallInst *CI, IRBuilder<> &B);
55 Value *optimizeMemSetChk(CallInst *CI, IRBuilder<> &B);
56 Value *optimizeStrCpyChk(CallInst *CI, IRBuilder<> &B);
57 Value *optimizeStrNCpyChk(CallInst *CI, IRBuilder<> &B);
59 /// \brief Checks whether the call \p CI to a fortified libcall is foldable
60 /// to the non-fortified version.
61 bool isFortifiedCallFoldable(CallInst *CI, unsigned ObjSizeOp,
62 unsigned SizeOp, bool isString);
65 /// LibCallSimplifier - This class implements a collection of optimizations
66 /// that replace well formed calls to library functions with a more optimal
67 /// form. For example, replacing 'printf("Hello!")' with 'puts("Hello!")'.
68 class LibCallSimplifier {
70 FortifiedLibCallSimplifier FortifiedSimplifier;
72 const TargetLibraryInfo *TLI;
74 function_ref<void(Instruction *, Value *)> Replacer;
76 /// \brief Internal wrapper for RAUW that is the default implementation.
78 /// Other users may provide an alternate function with this signature instead
80 static void replaceAllUsesWithDefault(Instruction *I, Value *With);
82 /// \brief Replace an instruction's uses with a value using our replacer.
83 void replaceAllUsesWith(Instruction *I, Value *With);
86 LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI,
87 function_ref<void(Instruction *, Value *)> Replacer =
88 &replaceAllUsesWithDefault);
90 /// optimizeCall - Take the given call instruction and return a more
91 /// optimal value to replace the instruction with or 0 if a more
92 /// optimal form can't be found. Note that the returned value may
93 /// be equal to the instruction being optimized. In this case all
94 /// other instructions that use the given instruction were modified
95 /// and the given instruction is dead.
96 /// The call must not be an indirect call.
97 Value *optimizeCall(CallInst *CI);
100 // String and Memory Library Call Optimizations
101 Value *optimizeStrCat(CallInst *CI, IRBuilder<> &B);
102 Value *optimizeStrNCat(CallInst *CI, IRBuilder<> &B);
103 Value *optimizeStrChr(CallInst *CI, IRBuilder<> &B);
104 Value *optimizeStrRChr(CallInst *CI, IRBuilder<> &B);
105 Value *optimizeStrCmp(CallInst *CI, IRBuilder<> &B);
106 Value *optimizeStrNCmp(CallInst *CI, IRBuilder<> &B);
107 Value *optimizeStrCpy(CallInst *CI, IRBuilder<> &B);
108 Value *optimizeStpCpy(CallInst *CI, IRBuilder<> &B);
109 Value *optimizeStrNCpy(CallInst *CI, IRBuilder<> &B);
110 Value *optimizeStrLen(CallInst *CI, IRBuilder<> &B);
111 Value *optimizeStrPBrk(CallInst *CI, IRBuilder<> &B);
112 Value *optimizeStrTo(CallInst *CI, IRBuilder<> &B);
113 Value *optimizeStrSpn(CallInst *CI, IRBuilder<> &B);
114 Value *optimizeStrCSpn(CallInst *CI, IRBuilder<> &B);
115 Value *optimizeStrStr(CallInst *CI, IRBuilder<> &B);
116 Value *optimizeMemCmp(CallInst *CI, IRBuilder<> &B);
117 Value *optimizeMemCpy(CallInst *CI, IRBuilder<> &B);
118 Value *optimizeMemMove(CallInst *CI, IRBuilder<> &B);
119 Value *optimizeMemSet(CallInst *CI, IRBuilder<> &B);
120 // Wrapper for all String/Memory Library Call Optimizations
121 Value *optimizeStringMemoryLibCall(CallInst *CI, IRBuilder<> &B);
123 // Math Library Optimizations
124 Value *optimizeUnaryDoubleFP(CallInst *CI, IRBuilder<> &B, bool CheckRetType);
125 Value *optimizeBinaryDoubleFP(CallInst *CI, IRBuilder<> &B);
126 Value *optimizeCos(CallInst *CI, IRBuilder<> &B);
127 Value *optimizePow(CallInst *CI, IRBuilder<> &B);
128 Value *optimizeExp2(CallInst *CI, IRBuilder<> &B);
129 Value *optimizeFabs(CallInst *CI, IRBuilder<> &B);
130 Value *optimizeSqrt(CallInst *CI, IRBuilder<> &B);
131 Value *optimizeSinCosPi(CallInst *CI, IRBuilder<> &B);
133 // Integer Library Call Optimizations
134 Value *optimizeFFS(CallInst *CI, IRBuilder<> &B);
135 Value *optimizeAbs(CallInst *CI, IRBuilder<> &B);
136 Value *optimizeIsDigit(CallInst *CI, IRBuilder<> &B);
137 Value *optimizeIsAscii(CallInst *CI, IRBuilder<> &B);
138 Value *optimizeToAscii(CallInst *CI, IRBuilder<> &B);
140 // Formatting and IO Library Call Optimizations
141 Value *optimizeErrorReporting(CallInst *CI, IRBuilder<> &B,
143 Value *optimizePrintF(CallInst *CI, IRBuilder<> &B);
144 Value *optimizeSPrintF(CallInst *CI, IRBuilder<> &B);
145 Value *optimizeFPrintF(CallInst *CI, IRBuilder<> &B);
146 Value *optimizeFWrite(CallInst *CI, IRBuilder<> &B);
147 Value *optimizeFPuts(CallInst *CI, IRBuilder<> &B);
148 Value *optimizePuts(CallInst *CI, IRBuilder<> &B);
151 Value *emitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B);
152 void classifyArgUse(Value *Val, BasicBlock *BB, bool IsFloat,
153 SmallVectorImpl<CallInst *> &SinCalls,
154 SmallVectorImpl<CallInst *> &CosCalls,
155 SmallVectorImpl<CallInst *> &SinCosCalls);
156 void replaceTrigInsts(SmallVectorImpl<CallInst *> &Calls, Value *Res);
157 Value *optimizePrintFString(CallInst *CI, IRBuilder<> &B);
158 Value *optimizeSPrintFString(CallInst *CI, IRBuilder<> &B);
159 Value *optimizeFPrintFString(CallInst *CI, IRBuilder<> &B);
161 /// hasFloatVersion - Checks if there is a float version of the specified
162 /// function by checking for an existing function with name FuncName + f
163 bool hasFloatVersion(StringRef FuncName);
165 } // End llvm namespace