1 //== llvm/Support/LowLevelTypeImpl.h --------------------------- -*- 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 /// Implement a low-level type suitable for MachineInstr level instruction
13 /// For a type attached to a MachineInstr, we only care about 2 details: total
14 /// size and the number of vector lanes (if any). Accordingly, there are 4
15 /// possible valid type-kinds:
17 /// * `sN` for scalars and aggregates
18 /// * `<N x sM>` for vectors, which must have at least 2 elements.
19 /// * `pN` for pointers
21 /// Other information required for correct selection is expected to be carried
22 /// by the opcode, or non-type flags. For example the distinction between G_ADD
23 /// and G_FADD for int/float or fast-math flags.
25 //===----------------------------------------------------------------------===//
27 #ifndef LLVM_SUPPORT_LOWLEVELTYPEIMPL_H
28 #define LLVM_SUPPORT_LOWLEVELTYPEIMPL_H
31 #include "llvm/ADT/DenseMapInfo.h"
32 #include "llvm/CodeGen/MachineValueType.h"
42 /// Get a low-level scalar or aggregate "bag of bits".
43 static LLT scalar(unsigned SizeInBits) {
44 assert(SizeInBits > 0 && "invalid scalar size");
45 return LLT{/*isPointer=*/false, /*isVector=*/false, /*NumElements=*/0,
46 SizeInBits, /*AddressSpace=*/0};
49 /// Get a low-level pointer in the given address space (defaulting to 0).
50 static LLT pointer(uint16_t AddressSpace, unsigned SizeInBits) {
51 assert(SizeInBits > 0 && "invalid pointer size");
52 return LLT{/*isPointer=*/true, /*isVector=*/false, /*NumElements=*/0,
53 SizeInBits, AddressSpace};
56 /// Get a low-level vector of some number of elements and element width.
57 /// \p NumElements must be at least 2.
58 static LLT vector(uint16_t NumElements, unsigned ScalarSizeInBits) {
59 assert(NumElements > 1 && "invalid number of vector elements");
60 assert(ScalarSizeInBits > 0 && "invalid vector element size");
61 return LLT{/*isPointer=*/false, /*isVector=*/true, NumElements,
62 ScalarSizeInBits, /*AddressSpace=*/0};
65 /// Get a low-level vector of some number of elements and element type.
66 static LLT vector(uint16_t NumElements, LLT ScalarTy) {
67 assert(NumElements > 1 && "invalid number of vector elements");
68 assert(!ScalarTy.isVector() && "invalid vector element type");
69 return LLT{ScalarTy.isPointer(), /*isVector=*/true, NumElements,
70 ScalarTy.getSizeInBits(),
71 ScalarTy.isPointer() ? ScalarTy.getAddressSpace() : 0};
74 explicit LLT(bool isPointer, bool isVector, uint16_t NumElements,
75 unsigned SizeInBits, unsigned AddressSpace) {
76 init(isPointer, isVector, NumElements, SizeInBits, AddressSpace);
78 explicit LLT() : IsPointer(false), IsVector(false), RawData(0) {}
82 bool isValid() const { return RawData != 0; }
84 bool isScalar() const { return isValid() && !IsPointer && !IsVector; }
86 bool isPointer() const { return isValid() && IsPointer && !IsVector; }
88 bool isVector() const { return isValid() && IsVector; }
90 /// Returns the number of elements in a vector LLT. Must only be called on
92 uint16_t getNumElements() const {
93 assert(IsVector && "cannot get number of elements on scalar/aggregate");
95 return getFieldValue(VectorElementsFieldInfo);
97 return getFieldValue(PointerVectorElementsFieldInfo);
100 /// Returns the total size of the type. Must only be called on sized types.
101 unsigned getSizeInBits() const {
102 if (isPointer() || isScalar())
103 return getScalarSizeInBits();
104 return getScalarSizeInBits() * getNumElements();
107 unsigned getScalarSizeInBits() const {
108 assert(RawData != 0 && "Invalid Type");
111 return getFieldValue(ScalarSizeFieldInfo);
113 return getFieldValue(PointerSizeFieldInfo);
116 return getFieldValue(VectorSizeFieldInfo);
118 return getFieldValue(PointerVectorSizeFieldInfo);
122 unsigned getAddressSpace() const {
123 assert(RawData != 0 && "Invalid Type");
124 assert(IsPointer && "cannot get address space of non-pointer type");
126 return getFieldValue(PointerAddressSpaceFieldInfo);
128 return getFieldValue(PointerVectorAddressSpaceFieldInfo);
131 /// Returns the vector's element type. Only valid for vector types.
132 LLT getElementType() const {
133 assert(isVector() && "cannot get element type of scalar/aggregate");
135 return pointer(getAddressSpace(), getScalarSizeInBits());
137 return scalar(getScalarSizeInBits());
140 /// Get a low-level type with half the size of the original, by halving the
141 /// size of the scalar type involved. For example `s32` will become `s16`,
142 /// `<2 x s32>` will become `<2 x s16>`.
143 LLT halfScalarSize() const {
144 assert(!IsPointer && getScalarSizeInBits() > 1 &&
145 getScalarSizeInBits() % 2 == 0 && "cannot half size of this type");
146 return LLT{/*isPointer=*/false, IsVector ? true : false,
147 IsVector ? getNumElements() : (uint16_t)0,
148 getScalarSizeInBits() / 2, /*AddressSpace=*/0};
151 /// Get a low-level type with twice the size of the original, by doubling the
152 /// size of the scalar type involved. For example `s32` will become `s64`,
153 /// `<2 x s32>` will become `<2 x s64>`.
154 LLT doubleScalarSize() const {
155 assert(!IsPointer && "cannot change size of this type");
156 return LLT{/*isPointer=*/false, IsVector ? true : false,
157 IsVector ? getNumElements() : (uint16_t)0,
158 getScalarSizeInBits() * 2, /*AddressSpace=*/0};
161 /// Get a low-level type with half the size of the original, by halving the
162 /// number of vector elements of the scalar type involved. The source must be
163 /// a vector type with an even number of elements. For example `<4 x s32>`
164 /// will become `<2 x s32>`, `<2 x s32>` will become `s32`.
165 LLT halfElements() const {
166 assert(isVector() && getNumElements() % 2 == 0 && "cannot half odd vector");
167 if (getNumElements() == 2)
168 return scalar(getScalarSizeInBits());
170 return LLT{/*isPointer=*/false, /*isVector=*/true,
171 (uint16_t)(getNumElements() / 2), getScalarSizeInBits(),
175 /// Get a low-level type with twice the size of the original, by doubling the
176 /// number of vector elements of the scalar type involved. The source must be
177 /// a vector type. For example `<2 x s32>` will become `<4 x s32>`. Doubling
178 /// the number of elements in sN produces <2 x sN>.
179 LLT doubleElements() const {
180 return LLT{IsPointer ? true : false, /*isVector=*/true,
181 (uint16_t)(getNumElements() * 2), getScalarSizeInBits(),
182 IsPointer ? getAddressSpace() : 0};
185 void print(raw_ostream &OS) const;
187 bool operator==(const LLT &RHS) const {
188 return IsPointer == RHS.IsPointer && IsVector == RHS.IsVector &&
189 RHS.RawData == RawData;
192 bool operator!=(const LLT &RHS) const { return !(*this == RHS); }
194 friend struct DenseMapInfo<LLT>;
197 /// LLT is packed into 64 bits as follows:
200 /// with 62 bits remaining for Kind-specific data, packed in bitfields
201 /// as described below. As there isn't a simple portable way to pack bits
202 /// into bitfields, here the different fields in the packed structure is
203 /// described in static const *Field variables. Each of these variables
204 /// is a 2-element array, with the first element describing the bitfield size
205 /// and the second element describing the bitfield offset.
206 typedef int BitFieldInfo[2];
208 /// This is how the bitfields are packed per Kind:
210 /// gets encoded as RawData == 0, as that is an invalid encoding, since for
211 /// valid encodings, SizeInBits/SizeOfElement must be larger than 0.
212 /// * Non-pointer scalar (isPointer == 0 && isVector == 0):
214 static const constexpr BitFieldInfo ScalarSizeFieldInfo{32, 0};
215 /// * Pointer (isPointer == 1 && isVector == 0):
217 /// AddressSpace: 23;
218 static const constexpr BitFieldInfo PointerSizeFieldInfo{16, 0};
219 static const constexpr BitFieldInfo PointerAddressSpaceFieldInfo{
220 23, PointerSizeFieldInfo[0] + PointerSizeFieldInfo[1]};
221 /// * Vector-of-non-pointer (isPointer == 0 && isVector == 1):
223 /// SizeOfElement: 32;
224 static const constexpr BitFieldInfo VectorElementsFieldInfo{16, 0};
225 static const constexpr BitFieldInfo VectorSizeFieldInfo{
226 32, VectorElementsFieldInfo[0] + VectorElementsFieldInfo[1]};
227 /// * Vector-of-pointer (isPointer == 1 && isVector == 1):
229 /// SizeOfElement: 16;
230 /// AddressSpace: 23;
231 static const constexpr BitFieldInfo PointerVectorElementsFieldInfo{16, 0};
232 static const constexpr BitFieldInfo PointerVectorSizeFieldInfo{
234 PointerVectorElementsFieldInfo[1] + PointerVectorElementsFieldInfo[0]};
235 static const constexpr BitFieldInfo PointerVectorAddressSpaceFieldInfo{
236 23, PointerVectorSizeFieldInfo[1] + PointerVectorSizeFieldInfo[0]};
238 uint64_t IsPointer : 1;
239 uint64_t IsVector : 1;
240 uint64_t RawData : 62;
242 static uint64_t getMask(const BitFieldInfo FieldInfo) {
243 const int FieldSizeInBits = FieldInfo[0];
244 return (((uint64_t)1) << FieldSizeInBits) - 1;
246 static uint64_t maskAndShift(uint64_t Val, uint64_t Mask, uint8_t Shift) {
247 assert(Val <= Mask && "Value too large for field");
248 return (Val & Mask) << Shift;
250 static uint64_t maskAndShift(uint64_t Val, const BitFieldInfo FieldInfo) {
251 return maskAndShift(Val, getMask(FieldInfo), FieldInfo[1]);
253 uint64_t getFieldValue(const BitFieldInfo FieldInfo) const {
254 return getMask(FieldInfo) & (RawData >> FieldInfo[1]);
257 void init(bool IsPointer, bool IsVector, uint16_t NumElements,
258 unsigned SizeInBits, unsigned AddressSpace) {
259 this->IsPointer = IsPointer;
260 this->IsVector = IsVector;
263 RawData = maskAndShift(SizeInBits, ScalarSizeFieldInfo);
265 RawData = maskAndShift(SizeInBits, PointerSizeFieldInfo) |
266 maskAndShift(AddressSpace, PointerAddressSpaceFieldInfo);
268 assert(NumElements > 1 && "invalid number of vector elements");
270 RawData = maskAndShift(NumElements, VectorElementsFieldInfo) |
271 maskAndShift(SizeInBits, VectorSizeFieldInfo);
274 maskAndShift(NumElements, PointerVectorElementsFieldInfo) |
275 maskAndShift(SizeInBits, PointerVectorSizeFieldInfo) |
276 maskAndShift(AddressSpace, PointerVectorAddressSpaceFieldInfo);
281 inline raw_ostream& operator<<(raw_ostream &OS, const LLT &Ty) {
286 template<> struct DenseMapInfo<LLT> {
287 static inline LLT getEmptyKey() {
289 Invalid.IsPointer = true;
292 static inline LLT getTombstoneKey() {
294 Invalid.IsVector = true;
297 static inline unsigned getHashValue(const LLT &Ty) {
298 uint64_t Val = ((uint64_t)Ty.RawData) << 2 | ((uint64_t)Ty.IsPointer) << 1 |
299 ((uint64_t)Ty.IsVector);
300 return DenseMapInfo<uint64_t>::getHashValue(Val);
302 static bool isEqual(const LLT &LHS, const LLT &RHS) {
309 #endif // LLVM_SUPPORT_LOWLEVELTYPEIMPL_H