1 //======-- llvm/Support/NoFolder.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 NoFolder class, a helper for IRBuilder. It provides 11 // IRBuilder with a set of methods for creating unfolded constants. This is 12 // useful for learners trying to understand how LLVM IR works, and who don't 13 // want details to be hidden by the constant folder. For general constant 14 // creation and folding, use ConstantExpr and the routines in 15 // llvm/Analysis/ConstantFolding.h. 16 // 17 // Note: since it is not actually possible to create unfolded constants, this 18 // class returns instructions rather than constants. 19 // 20 //===----------------------------------------------------------------------===// 21 22 #ifndef LLVM_SUPPORT_NOFOLDER_H 23 #define LLVM_SUPPORT_NOFOLDER_H 24 25 #include "llvm/ADT/ArrayRef.h" 26 #include "llvm/IR/Constants.h" 27 #include "llvm/IR/Instructions.h" 28 29 namespace llvm { 30 31 /// NoFolder - Create "constants" (actually, instructions) with no folding. 32 class NoFolder { 33 public: 34 explicit NoFolder() {} 35 36 //===--------------------------------------------------------------------===// 37 // Binary Operators 38 //===--------------------------------------------------------------------===// 39 40 Instruction *CreateAdd(Constant *LHS, Constant *RHS, 41 bool HasNUW = false, bool HasNSW = false) const { 42 BinaryOperator *BO = BinaryOperator::CreateAdd(LHS, RHS); 43 if (HasNUW) BO->setHasNoUnsignedWrap(); 44 if (HasNSW) BO->setHasNoSignedWrap(); 45 return BO; 46 } 47 Instruction *CreateNSWAdd(Constant *LHS, Constant *RHS) const { 48 return BinaryOperator::CreateNSWAdd(LHS, RHS); 49 } 50 Instruction *CreateNUWAdd(Constant *LHS, Constant *RHS) const { 51 return BinaryOperator::CreateNUWAdd(LHS, RHS); 52 } 53 Instruction *CreateFAdd(Constant *LHS, Constant *RHS) const { 54 return BinaryOperator::CreateFAdd(LHS, RHS); 55 } 56 Instruction *CreateSub(Constant *LHS, Constant *RHS, 57 bool HasNUW = false, bool HasNSW = false) const { 58 BinaryOperator *BO = BinaryOperator::CreateSub(LHS, RHS); 59 if (HasNUW) BO->setHasNoUnsignedWrap(); 60 if (HasNSW) BO->setHasNoSignedWrap(); 61 return BO; 62 } 63 Instruction *CreateNSWSub(Constant *LHS, Constant *RHS) const { 64 return BinaryOperator::CreateNSWSub(LHS, RHS); 65 } 66 Instruction *CreateNUWSub(Constant *LHS, Constant *RHS) const { 67 return BinaryOperator::CreateNUWSub(LHS, RHS); 68 } 69 Instruction *CreateFSub(Constant *LHS, Constant *RHS) const { 70 return BinaryOperator::CreateFSub(LHS, RHS); 71 } 72 Instruction *CreateMul(Constant *LHS, Constant *RHS, 73 bool HasNUW = false, bool HasNSW = false) const { 74 BinaryOperator *BO = BinaryOperator::CreateMul(LHS, RHS); 75 if (HasNUW) BO->setHasNoUnsignedWrap(); 76 if (HasNSW) BO->setHasNoSignedWrap(); 77 return BO; 78 } 79 Instruction *CreateNSWMul(Constant *LHS, Constant *RHS) const { 80 return BinaryOperator::CreateNSWMul(LHS, RHS); 81 } 82 Instruction *CreateNUWMul(Constant *LHS, Constant *RHS) const { 83 return BinaryOperator::CreateNUWMul(LHS, RHS); 84 } 85 Instruction *CreateFMul(Constant *LHS, Constant *RHS) const { 86 return BinaryOperator::CreateFMul(LHS, RHS); 87 } 88 Instruction *CreateUDiv(Constant *LHS, Constant *RHS, 89 bool isExact = false) const { 90 if (!isExact) 91 return BinaryOperator::CreateUDiv(LHS, RHS); 92 return BinaryOperator::CreateExactUDiv(LHS, RHS); 93 } 94 Instruction *CreateExactUDiv(Constant *LHS, Constant *RHS) const { 95 return BinaryOperator::CreateExactUDiv(LHS, RHS); 96 } 97 Instruction *CreateSDiv(Constant *LHS, Constant *RHS, 98 bool isExact = false) const { 99 if (!isExact) 100 return BinaryOperator::CreateSDiv(LHS, RHS); 101 return BinaryOperator::CreateExactSDiv(LHS, RHS); 102 } 103 Instruction *CreateExactSDiv(Constant *LHS, Constant *RHS) const { 104 return BinaryOperator::CreateExactSDiv(LHS, RHS); 105 } 106 Instruction *CreateFDiv(Constant *LHS, Constant *RHS) const { 107 return BinaryOperator::CreateFDiv(LHS, RHS); 108 } 109 Instruction *CreateURem(Constant *LHS, Constant *RHS) const { 110 return BinaryOperator::CreateURem(LHS, RHS); 111 } 112 Instruction *CreateSRem(Constant *LHS, Constant *RHS) const { 113 return BinaryOperator::CreateSRem(LHS, RHS); 114 } 115 Instruction *CreateFRem(Constant *LHS, Constant *RHS) const { 116 return BinaryOperator::CreateFRem(LHS, RHS); 117 } 118 Instruction *CreateShl(Constant *LHS, Constant *RHS, bool HasNUW = false, 119 bool HasNSW = false) const { 120 BinaryOperator *BO = BinaryOperator::CreateShl(LHS, RHS); 121 if (HasNUW) BO->setHasNoUnsignedWrap(); 122 if (HasNSW) BO->setHasNoSignedWrap(); 123 return BO; 124 } 125 Instruction *CreateLShr(Constant *LHS, Constant *RHS, 126 bool isExact = false) const { 127 if (!isExact) 128 return BinaryOperator::CreateLShr(LHS, RHS); 129 return BinaryOperator::CreateExactLShr(LHS, RHS); 130 } 131 Instruction *CreateAShr(Constant *LHS, Constant *RHS, 132 bool isExact = false) const { 133 if (!isExact) 134 return BinaryOperator::CreateAShr(LHS, RHS); 135 return BinaryOperator::CreateExactAShr(LHS, RHS); 136 } 137 Instruction *CreateAnd(Constant *LHS, Constant *RHS) const { 138 return BinaryOperator::CreateAnd(LHS, RHS); 139 } 140 Instruction *CreateOr(Constant *LHS, Constant *RHS) const { 141 return BinaryOperator::CreateOr(LHS, RHS); 142 } 143 Instruction *CreateXor(Constant *LHS, Constant *RHS) const { 144 return BinaryOperator::CreateXor(LHS, RHS); 145 } 146 147 Instruction *CreateBinOp(Instruction::BinaryOps Opc, 148 Constant *LHS, Constant *RHS) const { 149 return BinaryOperator::Create(Opc, LHS, RHS); 150 } 151 152 //===--------------------------------------------------------------------===// 153 // Unary Operators 154 //===--------------------------------------------------------------------===// 155 156 Instruction *CreateNeg(Constant *C, 157 bool HasNUW = false, bool HasNSW = false) const { 158 BinaryOperator *BO = BinaryOperator::CreateNeg(C); 159 if (HasNUW) BO->setHasNoUnsignedWrap(); 160 if (HasNSW) BO->setHasNoSignedWrap(); 161 return BO; 162 } 163 Instruction *CreateNSWNeg(Constant *C) const { 164 return BinaryOperator::CreateNSWNeg(C); 165 } 166 Instruction *CreateNUWNeg(Constant *C) const { 167 return BinaryOperator::CreateNUWNeg(C); 168 } 169 Instruction *CreateFNeg(Constant *C) const { 170 return BinaryOperator::CreateFNeg(C); 171 } 172 Instruction *CreateNot(Constant *C) const { 173 return BinaryOperator::CreateNot(C); 174 } 175 176 //===--------------------------------------------------------------------===// 177 // Memory Instructions 178 //===--------------------------------------------------------------------===// 179 180 Constant *CreateGetElementPtr(Constant *C, 181 ArrayRef<Constant *> IdxList) const { 182 return ConstantExpr::getGetElementPtr(C, IdxList); 183 } 184 Constant *CreateGetElementPtr(Constant *C, Constant *Idx) const { 185 // This form of the function only exists to avoid ambiguous overload 186 // warnings about whether to convert Idx to ArrayRef<Constant *> or 187 // ArrayRef<Value *>. 188 return ConstantExpr::getGetElementPtr(C, Idx); 189 } 190 Instruction *CreateGetElementPtr(Constant *C, 191 ArrayRef<Value *> IdxList) const { 192 return GetElementPtrInst::Create(C, IdxList); 193 } 194 195 Constant *CreateInBoundsGetElementPtr(Constant *C, 196 ArrayRef<Constant *> IdxList) const { 197 return ConstantExpr::getInBoundsGetElementPtr(C, IdxList); 198 } 199 Constant *CreateInBoundsGetElementPtr(Constant *C, Constant *Idx) const { 200 // This form of the function only exists to avoid ambiguous overload 201 // warnings about whether to convert Idx to ArrayRef<Constant *> or 202 // ArrayRef<Value *>. 203 return ConstantExpr::getInBoundsGetElementPtr(C, Idx); 204 } 205 Instruction *CreateInBoundsGetElementPtr(Constant *C, 206 ArrayRef<Value *> IdxList) const { 207 return GetElementPtrInst::CreateInBounds(C, IdxList); 208 } 209 210 //===--------------------------------------------------------------------===// 211 // Cast/Conversion Operators 212 //===--------------------------------------------------------------------===// 213 214 Instruction *CreateCast(Instruction::CastOps Op, Constant *C, 215 Type *DestTy) const { 216 return CastInst::Create(Op, C, DestTy); 217 } 218 Instruction *CreatePointerCast(Constant *C, Type *DestTy) const { 219 return CastInst::CreatePointerCast(C, DestTy); 220 } 221 Instruction *CreateIntCast(Constant *C, Type *DestTy, 222 bool isSigned) const { 223 return CastInst::CreateIntegerCast(C, DestTy, isSigned); 224 } 225 Instruction *CreateFPCast(Constant *C, Type *DestTy) const { 226 return CastInst::CreateFPCast(C, DestTy); 227 } 228 229 Instruction *CreateBitCast(Constant *C, Type *DestTy) const { 230 return CreateCast(Instruction::BitCast, C, DestTy); 231 } 232 Instruction *CreateIntToPtr(Constant *C, Type *DestTy) const { 233 return CreateCast(Instruction::IntToPtr, C, DestTy); 234 } 235 Instruction *CreatePtrToInt(Constant *C, Type *DestTy) const { 236 return CreateCast(Instruction::PtrToInt, C, DestTy); 237 } 238 Instruction *CreateZExtOrBitCast(Constant *C, Type *DestTy) const { 239 return CastInst::CreateZExtOrBitCast(C, DestTy); 240 } 241 Instruction *CreateSExtOrBitCast(Constant *C, Type *DestTy) const { 242 return CastInst::CreateSExtOrBitCast(C, DestTy); 243 } 244 245 Instruction *CreateTruncOrBitCast(Constant *C, Type *DestTy) const { 246 return CastInst::CreateTruncOrBitCast(C, DestTy); 247 } 248 249 //===--------------------------------------------------------------------===// 250 // Compare Instructions 251 //===--------------------------------------------------------------------===// 252 253 Instruction *CreateICmp(CmpInst::Predicate P, 254 Constant *LHS, Constant *RHS) const { 255 return new ICmpInst(P, LHS, RHS); 256 } 257 Instruction *CreateFCmp(CmpInst::Predicate P, 258 Constant *LHS, Constant *RHS) const { 259 return new FCmpInst(P, LHS, RHS); 260 } 261 262 //===--------------------------------------------------------------------===// 263 // Other Instructions 264 //===--------------------------------------------------------------------===// 265 266 Instruction *CreateSelect(Constant *C, 267 Constant *True, Constant *False) const { 268 return SelectInst::Create(C, True, False); 269 } 270 271 Instruction *CreateExtractElement(Constant *Vec, Constant *Idx) const { 272 return ExtractElementInst::Create(Vec, Idx); 273 } 274 275 Instruction *CreateInsertElement(Constant *Vec, Constant *NewElt, 276 Constant *Idx) const { 277 return InsertElementInst::Create(Vec, NewElt, Idx); 278 } 279 280 Instruction *CreateShuffleVector(Constant *V1, Constant *V2, 281 Constant *Mask) const { 282 return new ShuffleVectorInst(V1, V2, Mask); 283 } 284 285 Instruction *CreateExtractValue(Constant *Agg, 286 ArrayRef<unsigned> IdxList) const { 287 return ExtractValueInst::Create(Agg, IdxList); 288 } 289 290 Instruction *CreateInsertValue(Constant *Agg, Constant *Val, 291 ArrayRef<unsigned> IdxList) const { 292 return InsertValueInst::Create(Agg, Val, IdxList); 293 } 294 }; 295 296 } 297 298 #endif 299
