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| 1 | +//===- X86.cpp ------------------------------------------------------------===// |
| 2 | +// |
| 3 | +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | +// See https://llvm.org/LICENSE.txt for license information. |
| 5 | +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | +// |
| 7 | +//===----------------------------------------------------------------------===// |
| 8 | + |
| 9 | +#include "llvm/ABI/ABIFunctionInfo.h" |
| 10 | +#include "llvm/ABI/ABIInfo.h" |
| 11 | +#include "llvm/ABI/TargetCodegenInfo.h" |
| 12 | +#include "llvm/ABI/Types.h" |
| 13 | +#include "llvm/IR/DerivedTypes.h" |
| 14 | +#include "llvm/IR/Type.h" |
| 15 | +#include "llvm/Support/Casting.h" |
| 16 | +#include "llvm/TargetParser/Triple.h" |
| 17 | + |
| 18 | +namespace llvm { |
| 19 | +namespace abi { |
| 20 | + |
| 21 | +enum class AVXABILevel { None, AVX, AVX512 }; |
| 22 | + |
| 23 | +class X86_64ABIInfo : public ABIInfo { |
| 24 | +public: |
| 25 | + enum Class { |
| 26 | + Integer = 0, |
| 27 | + SSE, |
| 28 | + SSEUp, |
| 29 | + X87, |
| 30 | + X87UP, |
| 31 | + Complex_X87, |
| 32 | + NoClass, |
| 33 | + Memory |
| 34 | + }; |
| 35 | + |
| 36 | +private: |
| 37 | + AVXABILevel AVXLevel; |
| 38 | + bool Has64BitPointers; |
| 39 | + const llvm::Triple &TargetTriple; |
| 40 | + |
| 41 | + static Class merge(Class Accum, Class Field); |
| 42 | + |
| 43 | + void postMerge(unsigned AggregateSize, Class &Lo, Class &Hi) const; |
| 44 | + |
| 45 | + void classify(Type T, uint64_t OffsetBase, Class &Lo, Class &Hi, |
| 46 | + bool IsNamedArg, bool IsRegCall = false) const; |
| 47 | + |
| 48 | + llvm::Type *getByteVectorType(const Type *Ty) const; |
| 49 | + llvm::Type *getSseTypeAtOffset(llvm::Type *IRType, unsigned IROffset, |
| 50 | + const Type *SourceTy, |
| 51 | + unsigned SourceOffset) const; |
| 52 | + |
| 53 | + llvm::Type *getIntegerTypeAtOffset(llvm::Type *IRType, unsigned IROffset, |
| 54 | + const Type *SourceTy, |
| 55 | + unsigned SourceOffset) const; |
| 56 | + |
| 57 | + ABIArgInfo getIndirectReturnResult(const Type *Ty) const; |
| 58 | + |
| 59 | + ABIArgInfo getIndirectResult(const Type *Ty, unsigned FreeIntRegs) const; |
| 60 | + |
| 61 | + ABIArgInfo classifyReturnType(const Type *RetTy) const override; |
| 62 | + |
| 63 | + ABIArgInfo classifyArgumentType(const Type *Ty, unsigned FreeIntRegs, |
| 64 | + unsigned &NeededInt, unsigned &NeededSse, |
| 65 | + bool IsNamedArg, |
| 66 | + bool IsRegCall = false) const; |
| 67 | + |
| 68 | + ABIArgInfo classifyRegCallStructType(const Type *Ty, unsigned &NeededInt, |
| 69 | + unsigned &NeededSSE, |
| 70 | + unsigned &MaxVectorWidth) const; |
| 71 | + |
| 72 | + ABIArgInfo classifyRegCallStructTypeImpl(const Type *Ty, unsigned &NeededInt, |
| 73 | + unsigned &NeededSSE, |
| 74 | + unsigned &MaxVectorWidth) const; |
| 75 | + |
| 76 | + bool isIllegalVectorType(const Type *Ty) const; |
| 77 | + |
| 78 | + // The Functionality of these methods will be moved to |
| 79 | + // llvm::abi::ABICompatInfo |
| 80 | + |
| 81 | + bool honorsRevision98() const { return !TargetTriple.isOSDarwin(); } |
| 82 | + |
| 83 | + bool classifyIntegerMMXAsSSE() const { |
| 84 | + if (TargetTriple.isOSDarwin() || TargetTriple.isPS() || |
| 85 | + TargetTriple.isOSFreeBSD()) |
| 86 | + return false; |
| 87 | + return true; |
| 88 | + } |
| 89 | + |
| 90 | + bool passInt128VectorsInMem() const { |
| 91 | + // TODO: accept ABICompat info from the frontends |
| 92 | + return TargetTriple.isOSLinux() || TargetTriple.isOSNetBSD(); |
| 93 | + } |
| 94 | + |
| 95 | + bool returnCXXRecordGreaterThan128InMem() const { |
| 96 | + // TODO: accept ABICompat info from the frontends |
| 97 | + return true; |
| 98 | + } |
| 99 | + |
| 100 | +public: |
| 101 | + X86_64ABIInfo(const Triple &Triple, AVXABILevel AVXABILevel, |
| 102 | + bool Has64BitPtrs, const ABICompatInfo &Compat) |
| 103 | + : ABIInfo(Compat), AVXLevel(AVXABILevel), Has64BitPointers(Has64BitPtrs), |
| 104 | + TargetTriple(Triple) {} |
| 105 | + |
| 106 | + bool isPassedUsingAVXType(const Type *Type) const { |
| 107 | + unsigned NeededInt, NeededSse; |
| 108 | + ABIArgInfo Info = classifyArgumentType(Type, 0, NeededInt, NeededSse, true); |
| 109 | + |
| 110 | + if (Info.isDirect()) { |
| 111 | + auto *Ty = Info.getCoerceToType(); |
| 112 | + if (auto *VectorTy = dyn_cast_or_null<VectorType>(Ty)) |
| 113 | + return VectorTy->getSizeInBits().getFixedValue(); |
| 114 | + } |
| 115 | + return false; |
| 116 | + } |
| 117 | + |
| 118 | + void computeInfo(ABIFunctionInfo &FI) const override; |
| 119 | + |
| 120 | + bool has64BitPointers() const { return Has64BitPointers; } |
| 121 | +}; |
| 122 | + |
| 123 | +void X86_64ABIInfo::postMerge(unsigned AggregateSize, Class &Lo, |
| 124 | + Class &Hi) const { |
| 125 | + // AMD64-ABI 3.2.3p2: Rule 5. Then a post merger cleanup is done: |
| 126 | + // |
| 127 | + // (a) If one of the classes is Memory, the whole argument is passed in |
| 128 | + // memory. |
| 129 | + // |
| 130 | + // (b) If X87UP is not preceded by X87, the whole argument is passed in |
| 131 | + // memory. |
| 132 | + // |
| 133 | + // (c) If the size of the aggregate exceeds two eightbytes and the first |
| 134 | + // eightbyte isn't SSE or any other eightbyte isn't SSEUP, the whole |
| 135 | + // argument is passed in memory. NOTE: This is necessary to keep the |
| 136 | + // ABI working for processors that don't support the __m256 type. |
| 137 | + // |
| 138 | + // (d) If SSEUP is not preceded by SSE or SSEUP, it is converted to SSE. |
| 139 | + // |
| 140 | + // Some of these are enforced by the merging logic. Others can arise |
| 141 | + // only with unions; for example: |
| 142 | + // union { _Complex double; unsigned; } |
| 143 | + // |
| 144 | + // Note that clauses (b) and (c) were added in 0.98. |
| 145 | + |
| 146 | + if (Hi == Memory) |
| 147 | + Lo = Memory; |
| 148 | + if (Hi == X87UP && Lo != X87 && getABICompatInfo().Flags.HonorsRevision98) |
| 149 | + Lo = Memory; |
| 150 | + if (AggregateSize > 128 && (Lo != SSE && Hi != SSEUp)) |
| 151 | + Lo = Memory; |
| 152 | + if (Hi == SSEUp && Lo != SSE) |
| 153 | + Hi = SSE; |
| 154 | +} |
| 155 | +X86_64ABIInfo::Class X86_64ABIInfo::merge(Class Accum, Class Field) { |
| 156 | + // AMD64-ABI 3.2.3p2: Rule 4. Each field of an object is |
| 157 | + // classified recursively so that always two fields are |
| 158 | + // considered. The resulting class is calculated according to |
| 159 | + // the classes of the fields in the eightbyte: |
| 160 | + // |
| 161 | + // (a) If both classes are equal, this is the resulting class. |
| 162 | + // |
| 163 | + // (b) If one of the classes is NO_CLASS, the resulting class is |
| 164 | + // the other class. |
| 165 | + // |
| 166 | + // (c) If one of the classes is MEMORY, the result is the MEMORY |
| 167 | + // class. |
| 168 | + // |
| 169 | + // (d) If one of the classes is INTEGER, the result is the |
| 170 | + // INTEGER. |
| 171 | + // |
| 172 | + // (e) If one of the classes is X87, X87UP, COMPLEX_X87 class, |
| 173 | + // MEMORY is used as class. |
| 174 | + // |
| 175 | + // (f) Otherwise class SSE is used. |
| 176 | + |
| 177 | + // Accum should never be memory (we should have returned) or |
| 178 | + // ComplexX87 (because this cannot be passed in a structure). |
| 179 | + assert((Accum != Memory && Accum != Complex_X87) && |
| 180 | + "Invalid accumulated classification during merge."); |
| 181 | + |
| 182 | + if (Accum == Field || Field == NoClass) |
| 183 | + return Accum; |
| 184 | + if (Accum == NoClass) |
| 185 | + return Field; |
| 186 | + if (Field == Memory) |
| 187 | + return Memory; |
| 188 | + if (Accum == Integer || Field == Integer) |
| 189 | + return Integer; |
| 190 | + if (Field == X87 || Field == X87UP || Field == Complex_X87 || Accum == X87 || |
| 191 | + Accum == X87UP) |
| 192 | + return Memory; |
| 193 | + |
| 194 | + return SSE; |
| 195 | +} |
| 196 | + |
| 197 | +} // namespace abi |
| 198 | +} // namespace llvm |
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