1 //====-- llvm/Support/TargetFolder.h - Constant folding helper -*- 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 file defines the TargetFolder class, a helper for IRBuilder. 11 // It provides IRBuilder with a set of methods for creating constants with 12 // target dependent folding, in addition to the same target-independent 13 // folding that the ConstantFolder class provides. For general constant 14 // creation and folding, use ConstantExpr and the routines in 15 // llvm/Analysis/ConstantFolding.h. 16 // 17 //===----------------------------------------------------------------------===// 18 19 #ifndef LLVM_SUPPORT_TARGETFOLDER_H 20 #define LLVM_SUPPORT_TARGETFOLDER_H 21 22 #include "llvm/Constants.h" 23 #include "llvm/InstrTypes.h" 24 #include "llvm/ADT/ArrayRef.h" 25 #include "llvm/Analysis/ConstantFolding.h" 26 27 namespace llvm { 28 29 class TargetData; 30 31 /// TargetFolder - Create constants with target dependent folding. 32 class TargetFolder { 33 const TargetData *TD; 34 35 /// Fold - Fold the constant using target specific information. 36 Constant *Fold(Constant *C) const { 37 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) 38 if (Constant *CF = ConstantFoldConstantExpression(CE, TD)) 39 return CF; 40 return C; 41 } 42 43 public: 44 explicit TargetFolder(const TargetData *TheTD) : TD(TheTD) {} 45 46 //===--------------------------------------------------------------------===// 47 // Binary Operators 48 //===--------------------------------------------------------------------===// 49 50 Constant *CreateAdd(Constant *LHS, Constant *RHS, 51 bool HasNUW = false, bool HasNSW = false) const { 52 return Fold(ConstantExpr::getAdd(LHS, RHS, HasNUW, HasNSW)); 53 } 54 Constant *CreateFAdd(Constant *LHS, Constant *RHS) const { 55 return Fold(ConstantExpr::getFAdd(LHS, RHS)); 56 } 57 Constant *CreateSub(Constant *LHS, Constant *RHS, 58 bool HasNUW = false, bool HasNSW = false) const { 59 return Fold(ConstantExpr::getSub(LHS, RHS, HasNUW, HasNSW)); 60 } 61 Constant *CreateFSub(Constant *LHS, Constant *RHS) const { 62 return Fold(ConstantExpr::getFSub(LHS, RHS)); 63 } 64 Constant *CreateMul(Constant *LHS, Constant *RHS, 65 bool HasNUW = false, bool HasNSW = false) const { 66 return Fold(ConstantExpr::getMul(LHS, RHS, HasNUW, HasNSW)); 67 } 68 Constant *CreateFMul(Constant *LHS, Constant *RHS) const { 69 return Fold(ConstantExpr::getFMul(LHS, RHS)); 70 } 71 Constant *CreateUDiv(Constant *LHS, Constant *RHS, bool isExact = false)const{ 72 return Fold(ConstantExpr::getUDiv(LHS, RHS, isExact)); 73 } 74 Constant *CreateSDiv(Constant *LHS, Constant *RHS, bool isExact = false)const{ 75 return Fold(ConstantExpr::getSDiv(LHS, RHS, isExact)); 76 } 77 Constant *CreateFDiv(Constant *LHS, Constant *RHS) const { 78 return Fold(ConstantExpr::getFDiv(LHS, RHS)); 79 } 80 Constant *CreateURem(Constant *LHS, Constant *RHS) const { 81 return Fold(ConstantExpr::getURem(LHS, RHS)); 82 } 83 Constant *CreateSRem(Constant *LHS, Constant *RHS) const { 84 return Fold(ConstantExpr::getSRem(LHS, RHS)); 85 } 86 Constant *CreateFRem(Constant *LHS, Constant *RHS) const { 87 return Fold(ConstantExpr::getFRem(LHS, RHS)); 88 } 89 Constant *CreateShl(Constant *LHS, Constant *RHS, 90 bool HasNUW = false, bool HasNSW = false) const { 91 return Fold(ConstantExpr::getShl(LHS, RHS, HasNUW, HasNSW)); 92 } 93 Constant *CreateLShr(Constant *LHS, Constant *RHS, bool isExact = false)const{ 94 return Fold(ConstantExpr::getLShr(LHS, RHS, isExact)); 95 } 96 Constant *CreateAShr(Constant *LHS, Constant *RHS, bool isExact = false)const{ 97 return Fold(ConstantExpr::getAShr(LHS, RHS, isExact)); 98 } 99 Constant *CreateAnd(Constant *LHS, Constant *RHS) const { 100 return Fold(ConstantExpr::getAnd(LHS, RHS)); 101 } 102 Constant *CreateOr(Constant *LHS, Constant *RHS) const { 103 return Fold(ConstantExpr::getOr(LHS, RHS)); 104 } 105 Constant *CreateXor(Constant *LHS, Constant *RHS) const { 106 return Fold(ConstantExpr::getXor(LHS, RHS)); 107 } 108 109 Constant *CreateBinOp(Instruction::BinaryOps Opc, 110 Constant *LHS, Constant *RHS) const { 111 return Fold(ConstantExpr::get(Opc, LHS, RHS)); 112 } 113 114 //===--------------------------------------------------------------------===// 115 // Unary Operators 116 //===--------------------------------------------------------------------===// 117 118 Constant *CreateNeg(Constant *C, 119 bool HasNUW = false, bool HasNSW = false) const { 120 return Fold(ConstantExpr::getNeg(C, HasNUW, HasNSW)); 121 } 122 Constant *CreateFNeg(Constant *C) const { 123 return Fold(ConstantExpr::getFNeg(C)); 124 } 125 Constant *CreateNot(Constant *C) const { 126 return Fold(ConstantExpr::getNot(C)); 127 } 128 129 //===--------------------------------------------------------------------===// 130 // Memory Instructions 131 //===--------------------------------------------------------------------===// 132 133 Constant *CreateGetElementPtr(Constant *C, 134 ArrayRef<Constant *> IdxList) const { 135 return Fold(ConstantExpr::getGetElementPtr(C, IdxList)); 136 } 137 Constant *CreateGetElementPtr(Constant *C, Constant *Idx) const { 138 // This form of the function only exists to avoid ambiguous overload 139 // warnings about whether to convert Idx to ArrayRef<Constant *> or 140 // ArrayRef<Value *>. 141 return Fold(ConstantExpr::getGetElementPtr(C, Idx)); 142 } 143 Constant *CreateGetElementPtr(Constant *C, 144 ArrayRef<Value *> IdxList) const { 145 return Fold(ConstantExpr::getGetElementPtr(C, IdxList)); 146 } 147 148 Constant *CreateInBoundsGetElementPtr(Constant *C, 149 ArrayRef<Constant *> IdxList) const { 150 return Fold(ConstantExpr::getInBoundsGetElementPtr(C, IdxList)); 151 } 152 Constant *CreateInBoundsGetElementPtr(Constant *C, Constant *Idx) const { 153 // This form of the function only exists to avoid ambiguous overload 154 // warnings about whether to convert Idx to ArrayRef<Constant *> or 155 // ArrayRef<Value *>. 156 return Fold(ConstantExpr::getInBoundsGetElementPtr(C, Idx)); 157 } 158 Constant *CreateInBoundsGetElementPtr(Constant *C, 159 ArrayRef<Value *> IdxList) const { 160 return Fold(ConstantExpr::getInBoundsGetElementPtr(C, IdxList)); 161 } 162 163 //===--------------------------------------------------------------------===// 164 // Cast/Conversion Operators 165 //===--------------------------------------------------------------------===// 166 167 Constant *CreateCast(Instruction::CastOps Op, Constant *C, 168 Type *DestTy) const { 169 if (C->getType() == DestTy) 170 return C; // avoid calling Fold 171 return Fold(ConstantExpr::getCast(Op, C, DestTy)); 172 } 173 Constant *CreateIntCast(Constant *C, Type *DestTy, 174 bool isSigned) const { 175 if (C->getType() == DestTy) 176 return C; // avoid calling Fold 177 return Fold(ConstantExpr::getIntegerCast(C, DestTy, isSigned)); 178 } 179 Constant *CreatePointerCast(Constant *C, Type *DestTy) const { 180 return ConstantExpr::getPointerCast(C, DestTy); 181 } 182 Constant *CreateBitCast(Constant *C, Type *DestTy) const { 183 return CreateCast(Instruction::BitCast, C, DestTy); 184 } 185 Constant *CreateIntToPtr(Constant *C, Type *DestTy) const { 186 return CreateCast(Instruction::IntToPtr, C, DestTy); 187 } 188 Constant *CreatePtrToInt(Constant *C, Type *DestTy) const { 189 return CreateCast(Instruction::PtrToInt, C, DestTy); 190 } 191 Constant *CreateZExtOrBitCast(Constant *C, Type *DestTy) const { 192 if (C->getType() == DestTy) 193 return C; // avoid calling Fold 194 return Fold(ConstantExpr::getZExtOrBitCast(C, DestTy)); 195 } 196 Constant *CreateSExtOrBitCast(Constant *C, Type *DestTy) const { 197 if (C->getType() == DestTy) 198 return C; // avoid calling Fold 199 return Fold(ConstantExpr::getSExtOrBitCast(C, DestTy)); 200 } 201 Constant *CreateTruncOrBitCast(Constant *C, Type *DestTy) const { 202 if (C->getType() == DestTy) 203 return C; // avoid calling Fold 204 return Fold(ConstantExpr::getTruncOrBitCast(C, DestTy)); 205 } 206 207 //===--------------------------------------------------------------------===// 208 // Compare Instructions 209 //===--------------------------------------------------------------------===// 210 211 Constant *CreateICmp(CmpInst::Predicate P, Constant *LHS, 212 Constant *RHS) const { 213 return Fold(ConstantExpr::getCompare(P, LHS, RHS)); 214 } 215 Constant *CreateFCmp(CmpInst::Predicate P, Constant *LHS, 216 Constant *RHS) const { 217 return Fold(ConstantExpr::getCompare(P, LHS, RHS)); 218 } 219 220 //===--------------------------------------------------------------------===// 221 // Other Instructions 222 //===--------------------------------------------------------------------===// 223 224 Constant *CreateSelect(Constant *C, Constant *True, Constant *False) const { 225 return Fold(ConstantExpr::getSelect(C, True, False)); 226 } 227 228 Constant *CreateExtractElement(Constant *Vec, Constant *Idx) const { 229 return Fold(ConstantExpr::getExtractElement(Vec, Idx)); 230 } 231 232 Constant *CreateInsertElement(Constant *Vec, Constant *NewElt, 233 Constant *Idx) const { 234 return Fold(ConstantExpr::getInsertElement(Vec, NewElt, Idx)); 235 } 236 237 Constant *CreateShuffleVector(Constant *V1, Constant *V2, 238 Constant *Mask) const { 239 return Fold(ConstantExpr::getShuffleVector(V1, V2, Mask)); 240 } 241 242 Constant *CreateExtractValue(Constant *Agg, 243 ArrayRef<unsigned> IdxList) const { 244 return Fold(ConstantExpr::getExtractValue(Agg, IdxList)); 245 } 246 247 Constant *CreateInsertValue(Constant *Agg, Constant *Val, 248 ArrayRef<unsigned> IdxList) const { 249 return Fold(ConstantExpr::getInsertValue(Agg, Val, IdxList)); 250 } 251 }; 252 253 } 254 255 #endif 256
