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/STLExtras.h"
19 #include "llvm/Analysis/TargetLibraryInfo.h"
20 #include "llvm/IR/IRBuilder.h"
28 class TargetLibraryInfo;
31 class OptimizationRemarkEmitter;
33 /// This class implements simplifications for calls to fortified library
34 /// functions (__st*cpy_chk, __memcpy_chk, __memmove_chk, __memset_chk), to,
35 /// when possible, replace them with their non-checking counterparts.
36 /// Other optimizations can also be done, but it's possible to disable them and
37 /// only simplify needless use of the checking versions (when the object size
38 /// is unknown) by passing true for OnlyLowerUnknownSize.
39 class FortifiedLibCallSimplifier {
41 const TargetLibraryInfo *TLI;
42 bool OnlyLowerUnknownSize;
45 FortifiedLibCallSimplifier(const TargetLibraryInfo *TLI,
46 bool OnlyLowerUnknownSize = false);
48 /// Take the given call instruction and return a more
49 /// optimal value to replace the instruction with or 0 if a more
50 /// optimal form can't be found.
51 /// The call must not be an indirect call.
52 Value *optimizeCall(CallInst *CI);
55 Value *optimizeMemCpyChk(CallInst *CI, IRBuilder<> &B);
56 Value *optimizeMemMoveChk(CallInst *CI, IRBuilder<> &B);
57 Value *optimizeMemSetChk(CallInst *CI, IRBuilder<> &B);
59 // Str/Stp cpy are similar enough to be handled in the same functions.
60 Value *optimizeStrpCpyChk(CallInst *CI, IRBuilder<> &B, LibFunc Func);
61 Value *optimizeStrpNCpyChk(CallInst *CI, IRBuilder<> &B, LibFunc Func);
63 /// Checks whether the call \p CI to a fortified libcall is foldable
64 /// to the non-fortified version.
65 bool isFortifiedCallFoldable(CallInst *CI, unsigned ObjSizeOp,
66 unsigned SizeOp, bool isString);
69 /// LibCallSimplifier - This class implements a collection of optimizations
70 /// that replace well formed calls to library functions with a more optimal
71 /// form. For example, replacing 'printf("Hello!")' with 'puts("Hello!")'.
72 class LibCallSimplifier {
74 FortifiedLibCallSimplifier FortifiedSimplifier;
76 const TargetLibraryInfo *TLI;
77 OptimizationRemarkEmitter &ORE;
79 function_ref<void(Instruction *, Value *)> Replacer;
81 /// Internal wrapper for RAUW that is the default implementation.
83 /// Other users may provide an alternate function with this signature instead
85 static void replaceAllUsesWithDefault(Instruction *I, Value *With);
87 /// Replace an instruction's uses with a value using our replacer.
88 void replaceAllUsesWith(Instruction *I, Value *With);
91 LibCallSimplifier(const DataLayout &DL, const TargetLibraryInfo *TLI,
92 OptimizationRemarkEmitter &ORE,
93 function_ref<void(Instruction *, Value *)> Replacer =
94 &replaceAllUsesWithDefault);
96 /// optimizeCall - Take the given call instruction and return a more
97 /// optimal value to replace the instruction with or 0 if a more
98 /// optimal form can't be found. Note that the returned value may
99 /// be equal to the instruction being optimized. In this case all
100 /// other instructions that use the given instruction were modified
101 /// and the given instruction is dead.
102 /// The call must not be an indirect call.
103 Value *optimizeCall(CallInst *CI);
106 // String and Memory Library Call Optimizations
107 Value *optimizeStrCat(CallInst *CI, IRBuilder<> &B);
108 Value *optimizeStrNCat(CallInst *CI, IRBuilder<> &B);
109 Value *optimizeStrChr(CallInst *CI, IRBuilder<> &B);
110 Value *optimizeStrRChr(CallInst *CI, IRBuilder<> &B);
111 Value *optimizeStrCmp(CallInst *CI, IRBuilder<> &B);
112 Value *optimizeStrNCmp(CallInst *CI, IRBuilder<> &B);
113 Value *optimizeStrCpy(CallInst *CI, IRBuilder<> &B);
114 Value *optimizeStpCpy(CallInst *CI, IRBuilder<> &B);
115 Value *optimizeStrNCpy(CallInst *CI, IRBuilder<> &B);
116 Value *optimizeStrLen(CallInst *CI, IRBuilder<> &B);
117 Value *optimizeStrPBrk(CallInst *CI, IRBuilder<> &B);
118 Value *optimizeStrTo(CallInst *CI, IRBuilder<> &B);
119 Value *optimizeStrSpn(CallInst *CI, IRBuilder<> &B);
120 Value *optimizeStrCSpn(CallInst *CI, IRBuilder<> &B);
121 Value *optimizeStrStr(CallInst *CI, IRBuilder<> &B);
122 Value *optimizeMemChr(CallInst *CI, IRBuilder<> &B);
123 Value *optimizeMemCmp(CallInst *CI, IRBuilder<> &B);
124 Value *optimizeMemCpy(CallInst *CI, IRBuilder<> &B);
125 Value *optimizeMemMove(CallInst *CI, IRBuilder<> &B);
126 Value *optimizeMemSet(CallInst *CI, IRBuilder<> &B);
127 Value *optimizeRealloc(CallInst *CI, IRBuilder<> &B);
128 Value *optimizeWcslen(CallInst *CI, IRBuilder<> &B);
129 // Wrapper for all String/Memory Library Call Optimizations
130 Value *optimizeStringMemoryLibCall(CallInst *CI, IRBuilder<> &B);
132 // Math Library Optimizations
133 Value *optimizeCAbs(CallInst *CI, IRBuilder<> &B);
134 Value *optimizeCos(CallInst *CI, IRBuilder<> &B);
135 Value *optimizePow(CallInst *CI, IRBuilder<> &B);
136 Value *replacePowWithSqrt(CallInst *Pow, IRBuilder<> &B);
137 Value *optimizeExp2(CallInst *CI, IRBuilder<> &B);
138 Value *optimizeFMinFMax(CallInst *CI, IRBuilder<> &B);
139 Value *optimizeLog(CallInst *CI, IRBuilder<> &B);
140 Value *optimizeSqrt(CallInst *CI, IRBuilder<> &B);
141 Value *optimizeSinCosPi(CallInst *CI, IRBuilder<> &B);
142 Value *optimizeTan(CallInst *CI, IRBuilder<> &B);
143 // Wrapper for all floating point library call optimizations
144 Value *optimizeFloatingPointLibCall(CallInst *CI, LibFunc Func,
147 // Integer Library Call Optimizations
148 Value *optimizeFFS(CallInst *CI, IRBuilder<> &B);
149 Value *optimizeFls(CallInst *CI, IRBuilder<> &B);
150 Value *optimizeAbs(CallInst *CI, IRBuilder<> &B);
151 Value *optimizeIsDigit(CallInst *CI, IRBuilder<> &B);
152 Value *optimizeIsAscii(CallInst *CI, IRBuilder<> &B);
153 Value *optimizeToAscii(CallInst *CI, IRBuilder<> &B);
154 Value *optimizeAtoi(CallInst *CI, IRBuilder<> &B);
155 Value *optimizeStrtol(CallInst *CI, IRBuilder<> &B);
157 // Formatting and IO Library Call Optimizations
158 Value *optimizeErrorReporting(CallInst *CI, IRBuilder<> &B,
160 Value *optimizePrintF(CallInst *CI, IRBuilder<> &B);
161 Value *optimizeSPrintF(CallInst *CI, IRBuilder<> &B);
162 Value *optimizeSnPrintF(CallInst *CI, IRBuilder<> &B);
163 Value *optimizeFPrintF(CallInst *CI, IRBuilder<> &B);
164 Value *optimizeFWrite(CallInst *CI, IRBuilder<> &B);
165 Value *optimizeFRead(CallInst *CI, IRBuilder<> &B);
166 Value *optimizeFPuts(CallInst *CI, IRBuilder<> &B);
167 Value *optimizeFGets(CallInst *CI, IRBuilder<> &B);
168 Value *optimizeFPutc(CallInst *CI, IRBuilder<> &B);
169 Value *optimizeFGetc(CallInst *CI, IRBuilder<> &B);
170 Value *optimizePuts(CallInst *CI, IRBuilder<> &B);
173 Value *emitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B);
174 void classifyArgUse(Value *Val, Function *F, bool IsFloat,
175 SmallVectorImpl<CallInst *> &SinCalls,
176 SmallVectorImpl<CallInst *> &CosCalls,
177 SmallVectorImpl<CallInst *> &SinCosCalls);
178 Value *optimizePrintFString(CallInst *CI, IRBuilder<> &B);
179 Value *optimizeSPrintFString(CallInst *CI, IRBuilder<> &B);
180 Value *optimizeSnPrintFString(CallInst *CI, IRBuilder<> &B);
181 Value *optimizeFPrintFString(CallInst *CI, IRBuilder<> &B);
183 /// hasFloatVersion - Checks if there is a float version of the specified
184 /// function by checking for an existing function with name FuncName + f
185 bool hasFloatVersion(StringRef FuncName);
187 /// Shared code to optimize strlen+wcslen.
188 Value *optimizeStringLength(CallInst *CI, IRBuilder<> &B, unsigned CharSize);
190 } // End llvm namespace