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