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MrSidimsMrSidims
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Add __builtin_spirv_ internal builtins (#3374)
Way they are implemented is described in: #3221 The PR also adds SPV_EXT_float8 extension and packed conversions for SPV_INTEL_int4 Currently only conversion instructions (and internal builtins) are covered. TODO: in the following PR Saturation decoration will be added. Signed-off-by: Sidorov, Dmitry <[email protected]> --------- Signed-off-by: Sidorov, Dmitry <[email protected]>
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-12
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14 files changed

+979
-12
lines changed

‎include/LLVMSPIRVExtensions.inc‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -82,4 +82,5 @@ EXT(SPV_INTEL_ternary_bitwise_function)
8282
EXT(SPV_INTEL_int4)
8383
EXT(SPV_INTEL_function_variants)
8484
EXT(SPV_INTEL_shader_atomic_bfloat16)
85+
EXT(SPV_EXT_float8)
8586
EXT(SPV_INTEL_predicated_io)

‎lib/SPIRV/SPIRVInternal.h‎

Lines changed: 83 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -373,6 +373,7 @@ const static char ConvertHandleToImageINTEL[] = "ConvertHandleToImageINTEL";
373373
const static char ConvertHandleToSamplerINTEL[] = "ConvertHandleToSamplerINTEL";
374374
const static char ConvertHandleToSampledImageINTEL[] =
375375
"ConvertHandleToSampledImageINTEL";
376+
const static char InternalBuiltinPrefix[] = "__builtin_spirv_";
376377
} // namespace kSPIRVName
377378

378379
namespace kSPIRVPostfix {
@@ -665,7 +666,7 @@ Op getSPIRVFuncOC(StringRef Name, SmallVectorImpl<std::string> *Dec = nullptr);
665666
bool getSPIRVBuiltin(const std::string &Name, spv::BuiltIn &Builtin);
666667

667668
/// \param Name LLVM function name
668-
/// \param DemangledName demanged name of the OpenCL built-in function
669+
/// \param DemangledName demangled name of the OpenCL built-in function
669670
/// \returns true if Name is the name of the OpenCL built-in function,
670671
/// false for other functions
671672
bool oclIsBuiltin(StringRef Name, StringRef &DemangledName, bool IsCpp = false);
@@ -728,6 +729,9 @@ CallInst *addCallInst(Module *M, StringRef FuncName, Type *RetTy,
728729
StringRef InstName = SPIR_TEMP_NAME_PREFIX_CALL,
729730
bool TakeFuncName = true);
730731

732+
/// Check if an LLVM type is spirv.CooperativeMatrixKHR.
733+
bool isLLVMCooperativeMatrixType(llvm::Type *Ty);
734+
731735
/// Add a call instruction for SPIR-V builtin function.
732736
CallInst *addCallInstSPIRV(Module *M, StringRef FuncName, Type *RetTy,
733737
ArrayRef<Value *> Args, AttributeList *Attrs,
@@ -1029,6 +1033,84 @@ bool postProcessBuiltinsReturningStruct(Module *M, bool IsCpp = false);
10291033

10301034
bool postProcessBuiltinsWithArrayArguments(Module *M, bool IsCpp = false);
10311035

1036+
/// \param MangledName LLVM function name.
1037+
/// \param DemangledName demangled name of the input function if it is the
1038+
/// translator's internal built-in function.
1039+
/// \returns true if MangledName is the name of the translator's internal
1040+
/// built-in function, false for other functions.
1041+
/// Used for 'mini'-floats conversion functions
1042+
bool isInternalSPIRVBuiltin(StringRef MangledName, StringRef &DemangledName);
1043+
1044+
// Wrapper around SPIR-V 1.6.4 FP Encoding to be used in the conversion
1045+
// descriptor
1046+
enum FPEncodingWrap {
1047+
Integer = FPEncoding::FPEncodingMax - 1,
1048+
IEEE754 = FPEncoding::FPEncodingMax,
1049+
BF16 = FPEncoding::FPEncodingBFloat16KHR,
1050+
E4M3 = FPEncoding::FPEncodingFloat8E4M3EXT,
1051+
E5M2 = FPEncoding::FPEncodingFloat8E5M2EXT,
1052+
};
1053+
1054+
// Structure describing non-trivial conversions (FP8 and int4)
1055+
struct FPConversionDesc {
1056+
FPEncodingWrap SrcEncoding;
1057+
FPEncodingWrap DstEncoding;
1058+
SPIRVWord ConvOpCode;
1059+
1060+
// To use as a key in std::map
1061+
bool operator==(const FPConversionDesc &Other) const {
1062+
return SrcEncoding == Other.SrcEncoding &&
1063+
DstEncoding == Other.DstEncoding && ConvOpCode == Other.ConvOpCode;
1064+
}
1065+
1066+
bool operator<(const FPConversionDesc &Other) const {
1067+
if (ConvOpCode != Other.ConvOpCode)
1068+
return ConvOpCode < Other.ConvOpCode;
1069+
if (SrcEncoding != Other.SrcEncoding)
1070+
return SrcEncoding < Other.SrcEncoding;
1071+
return DstEncoding < Other.DstEncoding;
1072+
}
1073+
};
1074+
1075+
// Maps internal builtin name to conversion descriptor
1076+
typedef SPIRVMap<llvm::StringRef, FPConversionDesc> FPConvertToEncodingMap;
1077+
1078+
// clang-format off
1079+
template <> inline void FPConvertToEncodingMap::init() {
1080+
// 8-bit conversions
1081+
add("ConvertE4M3ToFP16EXT",
1082+
{FPEncodingWrap::E4M3, FPEncodingWrap::IEEE754, OpFConvert});
1083+
add("ConvertE5M2ToFP16EXT",
1084+
{FPEncodingWrap::E5M2, FPEncodingWrap::IEEE754, OpFConvert});
1085+
add("ConvertE4M3ToBF16EXT",
1086+
{FPEncodingWrap::E4M3, FPEncodingWrap::BF16, OpFConvert});
1087+
add("ConvertE5M2ToBF16EXT",
1088+
{FPEncodingWrap::E5M2, FPEncodingWrap::BF16, OpFConvert});
1089+
add("ConvertFP16ToE4M3EXT",
1090+
{FPEncodingWrap::IEEE754, FPEncodingWrap::E4M3, OpFConvert});
1091+
add("ConvertFP16ToE5M2EXT",
1092+
{FPEncodingWrap::IEEE754, FPEncodingWrap::E5M2, OpFConvert});
1093+
add("ConvertBF16ToE4M3EXT",
1094+
{FPEncodingWrap::BF16, FPEncodingWrap::E4M3, OpFConvert});
1095+
add("ConvertBF16ToE5M2EXT",
1096+
{FPEncodingWrap::BF16, FPEncodingWrap::E5M2, OpFConvert});
1097+
1098+
add("ConvertInt4ToE4M3INTEL",
1099+
{FPEncodingWrap::Integer, FPEncodingWrap::E4M3, OpConvertSToF});
1100+
add("ConvertInt4ToE5M2INTEL",
1101+
{FPEncodingWrap::Integer, FPEncodingWrap::E5M2, OpConvertSToF});
1102+
add("ConvertInt4ToFP16INTEL",
1103+
{FPEncodingWrap::Integer, FPEncodingWrap::IEEE754, OpConvertSToF});
1104+
add("ConvertInt4ToBF16INTEL",
1105+
{FPEncodingWrap::Integer, FPEncodingWrap::BF16, OpConvertSToF});
1106+
add("ConvertFP16ToInt4INTEL",
1107+
{FPEncodingWrap::IEEE754, FPEncodingWrap::Integer, OpConvertFToS});
1108+
add("ConvertBF16ToInt4INTEL",
1109+
{FPEncodingWrap::BF16, FPEncodingWrap::Integer, OpConvertFToS});
1110+
}
1111+
1112+
// clang-format on
1113+
10321114
} // namespace SPIRV
10331115

10341116
#endif // SPIRV_SPIRVINTERNAL_H

‎lib/SPIRV/SPIRVReader.cpp‎

Lines changed: 90 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -297,6 +297,9 @@ std::optional<uint64_t> SPIRVToLLVM::getAlignment(SPIRVValue *V) {
297297

298298
Type *SPIRVToLLVM::transFPType(SPIRVType *T) {
299299
switch (T->getFloatBitWidth()) {
300+
case 8:
301+
// No LLVM IR counter part for FP8 - map it on i8
302+
return Type::getIntNTy(*Context, 8);
300303
case 16:
301304
if (T->isTypeFloat(16, FPEncodingBFloat16KHR))
302305
return Type::getBFloatTy(*Context);
@@ -1049,6 +1052,22 @@ Value *SPIRVToLLVM::transConvertInst(SPIRVValue *BV, Function *F,
10491052
CastInst::CastOps CO = Instruction::BitCast;
10501053
bool IsExt =
10511054
Dst->getScalarSizeInBits() > Src->getType()->getScalarSizeInBits();
1055+
1056+
auto GetFPEncoding = [](SPIRVType *Ty) -> FPEncodingWrap {
1057+
if (Ty->isTypeFloat()) {
1058+
unsigned Enc =
1059+
static_cast<SPIRVTypeFloat *>(Ty)->getFloatingPointEncoding();
1060+
return static_cast<FPEncodingWrap>(Enc);
1061+
}
1062+
if (Ty->isTypeInt())
1063+
return FPEncodingWrap::Integer;
1064+
return FPEncodingWrap::IEEE754;
1065+
};
1066+
1067+
auto IsFP8Encoding = [](FPEncodingWrap Encoding) -> bool {
1068+
return Encoding == FPEncodingWrap::E4M3 || Encoding == FPEncodingWrap::E5M2;
1069+
};
1070+
10521071
switch (BC->getOpCode()) {
10531072
case OpPtrCastToGeneric:
10541073
case OpGenericCastToPtr:
@@ -1070,10 +1089,58 @@ Value *SPIRVToLLVM::transConvertInst(SPIRVValue *BV, Function *F,
10701089
case OpUConvert:
10711090
CO = IsExt ? Instruction::ZExt : Instruction::Trunc;
10721091
break;
1073-
case OpFConvert:
1074-
CO = IsExt ? Instruction::FPExt : Instruction::FPTrunc;
1092+
case OpConvertSToF:
1093+
case OpConvertFToS:
1094+
case OpConvertUToF:
1095+
case OpConvertFToU:
1096+
case OpFConvert: {
1097+
const auto OC = BC->getOpCode();
1098+
{
1099+
auto SPVOps = BC->getOperands();
1100+
auto *SPVSrcTy = SPVOps[0]->getType();
1101+
auto *SPVDstTy = BC->getType();
1102+
1103+
auto GetEncodingAndUpdateType =
1104+
[GetFPEncoding](SPIRVType *&SPVTy) -> FPEncodingWrap {
1105+
if (SPVTy->isTypeVector()) {
1106+
SPVTy = SPVTy->getVectorComponentType();
1107+
} else if (SPVTy->isTypeCooperativeMatrixKHR()) {
1108+
auto *MT = static_cast<SPIRVTypeCooperativeMatrixKHR *>(SPVTy);
1109+
SPVTy = MT->getCompType();
1110+
}
1111+
return GetFPEncoding(SPVTy);
1112+
};
1113+
1114+
FPEncodingWrap SrcEnc = GetEncodingAndUpdateType(SPVSrcTy);
1115+
FPEncodingWrap DstEnc = GetEncodingAndUpdateType(SPVDstTy);
1116+
if (IsFP8Encoding(SrcEnc) || IsFP8Encoding(DstEnc) ||
1117+
SPVSrcTy->isTypeInt(4) || SPVDstTy->isTypeInt(4)) {
1118+
FPConversionDesc FPDesc = {SrcEnc, DstEnc, BC->getOpCode()};
1119+
auto Conv = SPIRV::FPConvertToEncodingMap::rmap(FPDesc);
1120+
std::vector<Value *> Ops = {Src};
1121+
std::vector<Type *> OpsTys = {Src->getType()};
1122+
1123+
std::string BuiltinName =
1124+
kSPIRVName::InternalBuiltinPrefix + std::string(Conv);
1125+
BuiltinFuncMangleInfo Info;
1126+
std::string MangledName = mangleBuiltin(BuiltinName, OpsTys, &Info);
1127+
1128+
FunctionType *FTy = FunctionType::get(Dst, OpsTys, false);
1129+
FunctionCallee Func = M->getOrInsertFunction(MangledName, FTy);
1130+
return CallInst::Create(Func, Ops, "", BB);
1131+
}
1132+
}
1133+
1134+
if (OC == OpFConvert) {
1135+
CO = IsExt ? Instruction::FPExt : Instruction::FPTrunc;
1136+
break;
1137+
}
1138+
CO = static_cast<CastInst::CastOps>(OpCodeMap::rmap(OC));
10751139
break;
1140+
}
10761141
case OpBitcast:
1142+
if (!Dst->isPointerTy() && Dst == Src->getType())
1143+
return Src;
10771144
// OpBitcast need to be handled as a special-case when the source is a
10781145
// pointer and the destination is not a pointer, and where the source is not
10791146
// a pointer and the destination is a pointer. This is supported by the
@@ -2970,11 +3037,29 @@ Value *SPIRVToLLVM::transValueWithoutDecoration(SPIRVValue *BV, Function *F,
29703037
if (isCvtOpCode(OC) && OC != OpGenericCastToPtrExplicit) {
29713038
auto *BI = static_cast<SPIRVInstruction *>(BV);
29723039
Value *Inst = nullptr;
2973-
if (BI->hasFPRoundingMode() || BI->isSaturatedConversion() ||
2974-
BI->getType()->isTypeCooperativeMatrixKHR())
3040+
if (BI->hasFPRoundingMode() || BI->isSaturatedConversion()) {
29753041
Inst = transSPIRVBuiltinFromInst(BI, BB);
2976-
else
3042+
} else if (BI->getType()->isTypeCooperativeMatrixKHR()) {
3043+
// For cooperative matrix conversions generate __builtin_spirv
3044+
// conversions instead of __spirv_FConvert in case of mini-float
3045+
// type element type.
3046+
auto *OutMatrixElementTy =
3047+
static_cast<SPIRVTypeCooperativeMatrixKHR *>(BI->getType())
3048+
->getCompType();
3049+
auto *InMatrixElementTy =
3050+
static_cast<SPIRVTypeCooperativeMatrixKHR *>(
3051+
static_cast<SPIRVUnary *>(BI)->getOperand(0)->getType())
3052+
->getCompType();
3053+
if (OutMatrixElementTy->isTypeFloat(8, FPEncodingFloat8E4M3EXT) ||
3054+
OutMatrixElementTy->isTypeFloat(8, FPEncodingFloat8E5M2EXT) ||
3055+
InMatrixElementTy->isTypeFloat(8, FPEncodingFloat8E4M3EXT) ||
3056+
InMatrixElementTy->isTypeFloat(8, FPEncodingFloat8E5M2EXT))
3057+
Inst = transConvertInst(BV, F, BB);
3058+
else
3059+
Inst = transSPIRVBuiltinFromInst(BI, BB);
3060+
} else {
29773061
Inst = transConvertInst(BV, F, BB);
3062+
}
29783063
return mapValue(BV, Inst);
29793064
}
29803065
return mapValue(

‎lib/SPIRV/SPIRVUtil.cpp‎

Lines changed: 23 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -40,6 +40,7 @@
4040

4141
// This file needs to be included before anything that declares
4242
// llvm::PointerType to avoid a compilation bug on MSVC.
43+
#include "llvm/Demangle/Demangle.h"
4344
#include "llvm/Demangle/ItaniumDemangle.h"
4445

4546
#include "FunctionDescriptor.h"
@@ -267,6 +268,12 @@ bool isSYCLBfloat16Type(llvm::Type *Ty) {
267268
return false;
268269
}
269270

271+
bool isLLVMCooperativeMatrixType(llvm::Type *Ty) {
272+
if (auto *TargetTy = dyn_cast<TargetExtType>(Ty))
273+
return TargetTy->getName() == "spirv.CooperativeMatrixKHR";
274+
return false;
275+
}
276+
270277
Function *getOrCreateFunction(Module *M, Type *RetTy, ArrayRef<Type *> ArgTypes,
271278
StringRef Name, BuiltinFuncMangleInfo *Mangle,
272279
AttributeList *Attrs, bool TakeName) {
@@ -439,7 +446,7 @@ bool getSPIRVBuiltin(const std::string &OrigName, spv::BuiltIn &B) {
439446
return getByName(R.str(), B);
440447
}
441448

442-
// Demangled name is a substring of the name. The DemangledName is updated only
449+
// DemangledName is a substring of Name. The DemangledName is updated only
443450
// if true is returned
444451
bool oclIsBuiltin(StringRef Name, StringRef &DemangledName, bool IsCpp) {
445452
if (Name == "printf") {
@@ -484,6 +491,21 @@ bool oclIsBuiltin(StringRef Name, StringRef &DemangledName, bool IsCpp) {
484491
return false;
485492
}
486493

494+
// DemangledName is a substring of Name. The DemangledName is updated only
495+
// if true is returned.
496+
bool isInternalSPIRVBuiltin(StringRef Name, StringRef &DemangledName) {
497+
if (!Name.starts_with("_Z"))
498+
return false;
499+
constexpr unsigned DemangledNameLenStart = 2;
500+
size_t Start = Name.find_first_not_of("0123456789", DemangledNameLenStart);
501+
if (!Name.substr(Start, Name.size() - 1)
502+
.starts_with(kSPIRVName::InternalBuiltinPrefix))
503+
return false;
504+
DemangledName = llvm::itaniumDemangle(Name.data(), false);
505+
DemangledName.consume_front(kSPIRVName::InternalBuiltinPrefix);
506+
return true;
507+
}
508+
487509
// Check if a mangled type Name is unsigned
488510
bool isMangledTypeUnsigned(char Mangled) {
489511
return Mangled == 'h' /* uchar */

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