1 //===- CodeGen/ValueTypes.h - Low-Level Target independ. types --*- 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 set of low-level target independent types which various 11 // values in the code generator are. This allows the target specific behavior 12 // of instructions to be described to target independent passes. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_CODEGEN_VALUETYPES_H 17 #define LLVM_CODEGEN_VALUETYPES_H 18 19 #include "llvm/CodeGen/MachineValueType.h" 20 #include <cassert> 21 #include <string> 22 23 namespace llvm { 24 25 class LLVMContext; 26 class Type; 27 28 /// EVT - Extended Value Type. Capable of holding value types which are not 29 /// native for any processor (such as the i12345 type), as well as the types 30 /// a MVT can represent. 31 struct EVT { 32 private: 33 MVT V; 34 Type *LLVMTy; 35 36 public: 37 EVT() : V((MVT::SimpleValueType)(MVT::INVALID_SIMPLE_VALUE_TYPE)), 38 LLVMTy(nullptr) {} 39 EVT(MVT::SimpleValueType SVT) : V(SVT), LLVMTy(nullptr) { } 40 EVT(MVT S) : V(S), LLVMTy(nullptr) {} 41 42 bool operator==(EVT VT) const { 43 return !(*this != VT); 44 } 45 bool operator!=(EVT VT) const { 46 if (V.SimpleTy != VT.V.SimpleTy) 47 return true; 48 if (V.SimpleTy < 0) 49 return LLVMTy != VT.LLVMTy; 50 return false; 51 } 52 53 /// getFloatingPointVT - Returns the EVT that represents a floating point 54 /// type with the given number of bits. There are two floating point types 55 /// with 128 bits - this returns f128 rather than ppcf128. 56 static EVT getFloatingPointVT(unsigned BitWidth) { 57 return MVT::getFloatingPointVT(BitWidth); 58 } 59 60 /// getIntegerVT - Returns the EVT that represents an integer with the given 61 /// number of bits. 62 static EVT getIntegerVT(LLVMContext &Context, unsigned BitWidth) { 63 MVT M = MVT::getIntegerVT(BitWidth); 64 if (M.SimpleTy >= 0) 65 return M; 66 return getExtendedIntegerVT(Context, BitWidth); 67 } 68 69 /// getVectorVT - Returns the EVT that represents a vector NumElements in 70 /// length, where each element is of type VT. 71 static EVT getVectorVT(LLVMContext &Context, EVT VT, unsigned NumElements) { 72 MVT M = MVT::getVectorVT(VT.V, NumElements); 73 if (M.SimpleTy >= 0) 74 return M; 75 return getExtendedVectorVT(Context, VT, NumElements); 76 } 77 78 /// changeVectorElementTypeToInteger - Return a vector with the same number 79 /// of elements as this vector, but with the element type converted to an 80 /// integer type with the same bitwidth. 81 EVT changeVectorElementTypeToInteger() const { 82 if (!isSimple()) 83 return changeExtendedVectorElementTypeToInteger(); 84 MVT EltTy = getSimpleVT().getVectorElementType(); 85 unsigned BitWidth = EltTy.getSizeInBits(); 86 MVT IntTy = MVT::getIntegerVT(BitWidth); 87 MVT VecTy = MVT::getVectorVT(IntTy, getVectorNumElements()); 88 assert(VecTy.SimpleTy >= 0 && 89 "Simple vector VT not representable by simple integer vector VT!"); 90 return VecTy; 91 } 92 93 /// isSimple - Test if the given EVT is simple (as opposed to being 94 /// extended). 95 bool isSimple() const { 96 return V.SimpleTy >= 0; 97 } 98 99 /// isExtended - Test if the given EVT is extended (as opposed to 100 /// being simple). 101 bool isExtended() const { 102 return !isSimple(); 103 } 104 105 /// isFloatingPoint - Return true if this is a FP, or a vector FP type. 106 bool isFloatingPoint() const { 107 return isSimple() ? V.isFloatingPoint() : isExtendedFloatingPoint(); 108 } 109 110 /// isInteger - Return true if this is an integer, or a vector integer type. 111 bool isInteger() const { 112 return isSimple() ? V.isInteger() : isExtendedInteger(); 113 } 114 115 /// isVector - Return true if this is a vector value type. 116 bool isVector() const { 117 return isSimple() ? V.isVector() : isExtendedVector(); 118 } 119 120 /// is16BitVector - Return true if this is a 16-bit vector type. 121 bool is16BitVector() const { 122 return isSimple() ? V.is16BitVector() : isExtended16BitVector(); 123 } 124 125 /// is32BitVector - Return true if this is a 32-bit vector type. 126 bool is32BitVector() const { 127 return isSimple() ? V.is32BitVector() : isExtended32BitVector(); 128 } 129 130 /// is64BitVector - Return true if this is a 64-bit vector type. 131 bool is64BitVector() const { 132 return isSimple() ? V.is64BitVector() : isExtended64BitVector(); 133 } 134 135 /// is128BitVector - Return true if this is a 128-bit vector type. 136 bool is128BitVector() const { 137 return isSimple() ? V.is128BitVector() : isExtended128BitVector(); 138 } 139 140 /// is256BitVector - Return true if this is a 256-bit vector type. 141 bool is256BitVector() const { 142 return isSimple() ? V.is256BitVector() : isExtended256BitVector(); 143 } 144 145 /// is512BitVector - Return true if this is a 512-bit vector type. 146 bool is512BitVector() const { 147 return isSimple() ? V.is512BitVector() : isExtended512BitVector(); 148 } 149 150 /// is1024BitVector - Return true if this is a 1024-bit vector type. 151 bool is1024BitVector() const { 152 return isSimple() ? V.is1024BitVector() : isExtended1024BitVector(); 153 } 154 155 /// isOverloaded - Return true if this is an overloaded type for TableGen. 156 bool isOverloaded() const { 157 return (V==MVT::iAny || V==MVT::fAny || V==MVT::vAny || V==MVT::iPTRAny); 158 } 159 160 /// isByteSized - Return true if the bit size is a multiple of 8. 161 bool isByteSized() const { 162 return (getSizeInBits() & 7) == 0; 163 } 164 165 /// isRound - Return true if the size is a power-of-two number of bytes. 166 bool isRound() const { 167 unsigned BitSize = getSizeInBits(); 168 return BitSize >= 8 && !(BitSize & (BitSize - 1)); 169 } 170 171 /// bitsEq - Return true if this has the same number of bits as VT. 172 bool bitsEq(EVT VT) const { 173 if (EVT::operator==(VT)) return true; 174 return getSizeInBits() == VT.getSizeInBits(); 175 } 176 177 /// bitsGT - Return true if this has more bits than VT. 178 bool bitsGT(EVT VT) const { 179 if (EVT::operator==(VT)) return false; 180 return getSizeInBits() > VT.getSizeInBits(); 181 } 182 183 /// bitsGE - Return true if this has no less bits than VT. 184 bool bitsGE(EVT VT) const { 185 if (EVT::operator==(VT)) return true; 186 return getSizeInBits() >= VT.getSizeInBits(); 187 } 188 189 /// bitsLT - Return true if this has less bits than VT. 190 bool bitsLT(EVT VT) const { 191 if (EVT::operator==(VT)) return false; 192 return getSizeInBits() < VT.getSizeInBits(); 193 } 194 195 /// bitsLE - Return true if this has no more bits than VT. 196 bool bitsLE(EVT VT) const { 197 if (EVT::operator==(VT)) return true; 198 return getSizeInBits() <= VT.getSizeInBits(); 199 } 200 201 202 /// getSimpleVT - Return the SimpleValueType held in the specified 203 /// simple EVT. 204 MVT getSimpleVT() const { 205 assert(isSimple() && "Expected a SimpleValueType!"); 206 return V; 207 } 208 209 /// getScalarType - If this is a vector type, return the element type, 210 /// otherwise return this. 211 EVT getScalarType() const { 212 return isVector() ? getVectorElementType() : *this; 213 } 214 215 /// getVectorElementType - Given a vector type, return the type of 216 /// each element. 217 EVT getVectorElementType() const { 218 assert(isVector() && "Invalid vector type!"); 219 if (isSimple()) 220 return V.getVectorElementType(); 221 return getExtendedVectorElementType(); 222 } 223 224 /// getVectorNumElements - Given a vector type, return the number of 225 /// elements it contains. 226 unsigned getVectorNumElements() const { 227 assert(isVector() && "Invalid vector type!"); 228 if (isSimple()) 229 return V.getVectorNumElements(); 230 return getExtendedVectorNumElements(); 231 } 232 233 /// getSizeInBits - Return the size of the specified value type in bits. 234 unsigned getSizeInBits() const { 235 if (isSimple()) 236 return V.getSizeInBits(); 237 return getExtendedSizeInBits(); 238 } 239 240 unsigned getScalarSizeInBits() const { 241 return getScalarType().getSizeInBits(); 242 } 243 244 /// getStoreSize - Return the number of bytes overwritten by a store 245 /// of the specified value type. 246 unsigned getStoreSize() const { 247 return (getSizeInBits() + 7) / 8; 248 } 249 250 /// getStoreSizeInBits - Return the number of bits overwritten by a store 251 /// of the specified value type. 252 unsigned getStoreSizeInBits() const { 253 return getStoreSize() * 8; 254 } 255 256 /// getRoundIntegerType - Rounds the bit-width of the given integer EVT up 257 /// to the nearest power of two (and at least to eight), and returns the 258 /// integer EVT with that number of bits. 259 EVT getRoundIntegerType(LLVMContext &Context) const { 260 assert(isInteger() && !isVector() && "Invalid integer type!"); 261 unsigned BitWidth = getSizeInBits(); 262 if (BitWidth <= 8) 263 return EVT(MVT::i8); 264 return getIntegerVT(Context, 1 << Log2_32_Ceil(BitWidth)); 265 } 266 267 /// getHalfSizedIntegerVT - Finds the smallest simple value type that is 268 /// greater than or equal to half the width of this EVT. If no simple 269 /// value type can be found, an extended integer value type of half the 270 /// size (rounded up) is returned. 271 EVT getHalfSizedIntegerVT(LLVMContext &Context) const { 272 assert(isInteger() && !isVector() && "Invalid integer type!"); 273 unsigned EVTSize = getSizeInBits(); 274 for (unsigned IntVT = MVT::FIRST_INTEGER_VALUETYPE; 275 IntVT <= MVT::LAST_INTEGER_VALUETYPE; ++IntVT) { 276 EVT HalfVT = EVT((MVT::SimpleValueType)IntVT); 277 if (HalfVT.getSizeInBits() * 2 >= EVTSize) 278 return HalfVT; 279 } 280 return getIntegerVT(Context, (EVTSize + 1) / 2); 281 } 282 283 /// \brief Return a VT for an integer vector type with the size of the 284 /// elements doubled. The typed returned may be an extended type. 285 EVT widenIntegerVectorElementType(LLVMContext &Context) const { 286 EVT EltVT = getVectorElementType(); 287 EltVT = EVT::getIntegerVT(Context, 2 * EltVT.getSizeInBits()); 288 return EVT::getVectorVT(Context, EltVT, getVectorNumElements()); 289 } 290 291 /// isPow2VectorType - Returns true if the given vector is a power of 2. 292 bool isPow2VectorType() const { 293 unsigned NElts = getVectorNumElements(); 294 return !(NElts & (NElts - 1)); 295 } 296 297 /// getPow2VectorType - Widens the length of the given vector EVT up to 298 /// the nearest power of 2 and returns that type. 299 EVT getPow2VectorType(LLVMContext &Context) const { 300 if (!isPow2VectorType()) { 301 unsigned NElts = getVectorNumElements(); 302 unsigned Pow2NElts = 1 << Log2_32_Ceil(NElts); 303 return EVT::getVectorVT(Context, getVectorElementType(), Pow2NElts); 304 } 305 else { 306 return *this; 307 } 308 } 309 310 /// getEVTString - This function returns value type as a string, 311 /// e.g. "i32". 312 std::string getEVTString() const; 313 314 /// getTypeForEVT - This method returns an LLVM type corresponding to the 315 /// specified EVT. For integer types, this returns an unsigned type. Note 316 /// that this will abort for types that cannot be represented. 317 Type *getTypeForEVT(LLVMContext &Context) const; 318 319 /// getEVT - Return the value type corresponding to the specified type. 320 /// This returns all pointers as iPTR. If HandleUnknown is true, unknown 321 /// types are returned as Other, otherwise they are invalid. 322 static EVT getEVT(Type *Ty, bool HandleUnknown = false); 323 324 intptr_t getRawBits() const { 325 if (isSimple()) 326 return V.SimpleTy; 327 else 328 return (intptr_t)(LLVMTy); 329 } 330 331 /// compareRawBits - A meaningless but well-behaved order, useful for 332 /// constructing containers. 333 struct compareRawBits { 334 bool operator()(EVT L, EVT R) const { 335 if (L.V.SimpleTy == R.V.SimpleTy) 336 return L.LLVMTy < R.LLVMTy; 337 else 338 return L.V.SimpleTy < R.V.SimpleTy; 339 } 340 }; 341 342 private: 343 // Methods for handling the Extended-type case in functions above. 344 // These are all out-of-line to prevent users of this header file 345 // from having a dependency on Type.h. 346 EVT changeExtendedVectorElementTypeToInteger() const; 347 static EVT getExtendedIntegerVT(LLVMContext &C, unsigned BitWidth); 348 static EVT getExtendedVectorVT(LLVMContext &C, EVT VT, 349 unsigned NumElements); 350 bool isExtendedFloatingPoint() const LLVM_READONLY; 351 bool isExtendedInteger() const LLVM_READONLY; 352 bool isExtendedVector() const LLVM_READONLY; 353 bool isExtended16BitVector() const LLVM_READONLY; 354 bool isExtended32BitVector() const LLVM_READONLY; 355 bool isExtended64BitVector() const LLVM_READONLY; 356 bool isExtended128BitVector() const LLVM_READONLY; 357 bool isExtended256BitVector() const LLVM_READONLY; 358 bool isExtended512BitVector() const LLVM_READONLY; 359 bool isExtended1024BitVector() const LLVM_READONLY; 360 EVT getExtendedVectorElementType() const; 361 unsigned getExtendedVectorNumElements() const LLVM_READONLY; 362 unsigned getExtendedSizeInBits() const; 363 }; 364 365 } // End llvm namespace 366 367 #endif 368
