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llvm-project/clang/lib/Sema/SemaRISCVVectorLookup.cpp

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//==- SemaRISCVVectorLookup.cpp - Name Lookup for RISC-V Vector Intrinsic -==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements name lookup for RISC-V vector intrinsic.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/RISCVIntrinsicManager.h"
#include "clang/Sema/Sema.h"
#include "clang/Support/RISCVVIntrinsicUtils.h"
#include "llvm/ADT/SmallVector.h"
#include <string>
#include <vector>
using namespace llvm;
using namespace clang;
using namespace clang::RISCV;
namespace {
// Function definition of a RVV intrinsic.
struct RVVIntrinsicDef {
/// Full function name with suffix, e.g. vadd_vv_i32m1.
std::string Name;
/// Overloaded function name, e.g. vadd.
std::string OverloadName;
/// Mapping to which clang built-in function, e.g. __builtin_rvv_vadd.
std::string BuiltinName;
/// Function signature, first element is return type.
RVVTypes Signature;
};
struct RVVOverloadIntrinsicDef {
// Indexes of RISCVIntrinsicManagerImpl::IntrinsicList.
SmallVector<size_t, 8> Indexes;
};
} // namespace
static const PrototypeDescriptor RVVSignatureTable[] = {
#define DECL_SIGNATURE_TABLE
#include "clang/Basic/riscv_vector_builtin_sema.inc"
#undef DECL_SIGNATURE_TABLE
};
static const RVVIntrinsicRecord RVVIntrinsicRecords[] = {
#define DECL_INTRINSIC_RECORDS
#include "clang/Basic/riscv_vector_builtin_sema.inc"
#undef DECL_INTRINSIC_RECORDS
};
// Get subsequence of signature table.
static ArrayRef<PrototypeDescriptor> ProtoSeq2ArrayRef(uint16_t Index,
uint8_t Length) {
return makeArrayRef(&RVVSignatureTable[Index], Length);
}
static QualType RVVType2Qual(ASTContext &Context, const RVVType *Type) {
QualType QT;
switch (Type->getScalarType()) {
case ScalarTypeKind::Void:
QT = Context.VoidTy;
break;
case ScalarTypeKind::Size_t:
QT = Context.getSizeType();
break;
case ScalarTypeKind::Ptrdiff_t:
QT = Context.getPointerDiffType();
break;
case ScalarTypeKind::UnsignedLong:
QT = Context.UnsignedLongTy;
break;
case ScalarTypeKind::SignedLong:
QT = Context.LongTy;
break;
case ScalarTypeKind::Boolean:
QT = Context.BoolTy;
break;
case ScalarTypeKind::SignedInteger:
QT = Context.getIntTypeForBitwidth(Type->getElementBitwidth(), true);
break;
case ScalarTypeKind::UnsignedInteger:
QT = Context.getIntTypeForBitwidth(Type->getElementBitwidth(), false);
break;
case ScalarTypeKind::Float:
switch (Type->getElementBitwidth()) {
case 64:
QT = Context.DoubleTy;
break;
case 32:
QT = Context.FloatTy;
break;
case 16:
QT = Context.Float16Ty;
break;
default:
llvm_unreachable("Unsupported floating point width.");
}
break;
case Invalid:
llvm_unreachable("Unhandled type.");
}
if (Type->isVector())
QT = Context.getScalableVectorType(QT, Type->getScale().value());
if (Type->isConstant())
QT = Context.getConstType(QT);
// Transform the type to a pointer as the last step, if necessary.
if (Type->isPointer())
QT = Context.getPointerType(QT);
return QT;
}
namespace {
class RISCVIntrinsicManagerImpl : public sema::RISCVIntrinsicManager {
private:
Sema &S;
ASTContext &Context;
// List of all RVV intrinsic.
std::vector<RVVIntrinsicDef> IntrinsicList;
// Mapping function name to index of IntrinsicList.
StringMap<size_t> Intrinsics;
// Mapping function name to RVVOverloadIntrinsicDef.
StringMap<RVVOverloadIntrinsicDef> OverloadIntrinsics;
// Create IntrinsicList
void InitIntrinsicList();
// Create RVVIntrinsicDef.
void InitRVVIntrinsic(const RVVIntrinsicRecord &Record, StringRef SuffixStr,
StringRef OverloadedSuffixStr, bool IsMask,
RVVTypes &Types, bool HasPolicy, Policy DefaultPolicy,
bool IsPrototypeDefaultTU);
// Create FunctionDecl for a vector intrinsic.
void CreateRVVIntrinsicDecl(LookupResult &LR, IdentifierInfo *II,
Preprocessor &PP, unsigned Index,
bool IsOverload);
public:
RISCVIntrinsicManagerImpl(clang::Sema &S) : S(S), Context(S.Context) {
InitIntrinsicList();
}
// Create RISC-V vector intrinsic and insert into symbol table if found, and
// return true, otherwise return false.
bool CreateIntrinsicIfFound(LookupResult &LR, IdentifierInfo *II,
Preprocessor &PP) override;
};
} // namespace
void RISCVIntrinsicManagerImpl::InitIntrinsicList() {
const TargetInfo &TI = Context.getTargetInfo();
bool HasVectorFloat32 = TI.hasFeature("zve32f");
bool HasVectorFloat64 = TI.hasFeature("zve64d");
bool HasZvfh = TI.hasFeature("experimental-zvfh");
bool HasRV64 = TI.hasFeature("64bit");
bool HasFullMultiply = TI.hasFeature("v");
// Construction of RVVIntrinsicRecords need to sync with createRVVIntrinsics
// in RISCVVEmitter.cpp.
for (auto &Record : RVVIntrinsicRecords) {
// Create Intrinsics for each type and LMUL.
BasicType BaseType = BasicType::Unknown;
ArrayRef<PrototypeDescriptor> BasicProtoSeq =
ProtoSeq2ArrayRef(Record.PrototypeIndex, Record.PrototypeLength);
ArrayRef<PrototypeDescriptor> SuffixProto =
ProtoSeq2ArrayRef(Record.SuffixIndex, Record.SuffixLength);
ArrayRef<PrototypeDescriptor> OverloadedSuffixProto = ProtoSeq2ArrayRef(
Record.OverloadedSuffixIndex, Record.OverloadedSuffixSize);
PolicyScheme UnMaskedPolicyScheme =
static_cast<PolicyScheme>(Record.UnMaskedPolicyScheme);
PolicyScheme MaskedPolicyScheme =
static_cast<PolicyScheme>(Record.MaskedPolicyScheme);
llvm::SmallVector<PrototypeDescriptor> ProtoSeq =
RVVIntrinsic::computeBuiltinTypes(
BasicProtoSeq, /*IsMasked=*/false,
/*HasMaskedOffOperand=*/false, Record.HasVL, Record.NF,
Record.IsPrototypeDefaultTU, UnMaskedPolicyScheme);
llvm::SmallVector<PrototypeDescriptor> ProtoMaskSeq =
RVVIntrinsic::computeBuiltinTypes(
BasicProtoSeq, /*IsMasked=*/true, Record.HasMaskedOffOperand,
Record.HasVL, Record.NF, Record.IsPrototypeDefaultTU,
MaskedPolicyScheme);
bool UnMaskedHasPolicy = UnMaskedPolicyScheme != PolicyScheme::SchemeNone;
bool MaskedHasPolicy = MaskedPolicyScheme != PolicyScheme::SchemeNone;
// If unmasked builtin supports policy, they should be TU or TA.
llvm::SmallVector<Policy> SupportedUnMaskedPolicies = {Policy::TU,
Policy::TA};
llvm::SmallVector<Policy> SupportedMaskedPolicies =
RVVIntrinsic::getSupportedMaskedPolicies(Record.HasTailPolicy,
Record.HasMaskPolicy);
for (unsigned int TypeRangeMaskShift = 0;
TypeRangeMaskShift <= static_cast<unsigned int>(BasicType::MaxOffset);
++TypeRangeMaskShift) {
unsigned int BaseTypeI = 1 << TypeRangeMaskShift;
BaseType = static_cast<BasicType>(BaseTypeI);
if ((BaseTypeI & Record.TypeRangeMask) != BaseTypeI)
continue;
// Check requirement.
if (BaseType == BasicType::Float16 && !HasZvfh)
continue;
if (BaseType == BasicType::Float32 && !HasVectorFloat32)
continue;
if (BaseType == BasicType::Float64 && !HasVectorFloat64)
continue;
if (((Record.RequiredExtensions & RVV_REQ_RV64) == RVV_REQ_RV64) &&
!HasRV64)
continue;
if ((BaseType == BasicType::Int64) &&
((Record.RequiredExtensions & RVV_REQ_FullMultiply) ==
RVV_REQ_FullMultiply) &&
!HasFullMultiply)
continue;
// Expanded with different LMUL.
for (int Log2LMUL = -3; Log2LMUL <= 3; Log2LMUL++) {
if (!(Record.Log2LMULMask & (1 << (Log2LMUL + 3))))
continue;
Optional<RVVTypes> Types =
RVVType::computeTypes(BaseType, Log2LMUL, Record.NF, ProtoSeq);
// Ignored to create new intrinsic if there are any illegal types.
if (!Types.has_value())
continue;
std::string SuffixStr =
RVVIntrinsic::getSuffixStr(BaseType, Log2LMUL, SuffixProto);
std::string OverloadedSuffixStr = RVVIntrinsic::getSuffixStr(
BaseType, Log2LMUL, OverloadedSuffixProto);
// Create non-masked intrinsic.
InitRVVIntrinsic(Record, SuffixStr, OverloadedSuffixStr, false, *Types,
UnMaskedHasPolicy, Policy::PolicyNone,
Record.IsPrototypeDefaultTU);
// Create non-masked policy intrinsic.
if (Record.UnMaskedPolicyScheme != PolicyScheme::SchemeNone) {
for (auto P : SupportedUnMaskedPolicies) {
llvm::SmallVector<PrototypeDescriptor> PolicyPrototype =
RVVIntrinsic::computeBuiltinTypes(
BasicProtoSeq, /*IsMasked=*/false,
/*HasMaskedOffOperand=*/false, Record.HasVL, Record.NF,
Record.IsPrototypeDefaultTU, UnMaskedPolicyScheme, P);
Optional<RVVTypes> PolicyTypes = RVVType::computeTypes(
BaseType, Log2LMUL, Record.NF, PolicyPrototype);
InitRVVIntrinsic(Record, SuffixStr, OverloadedSuffixStr,
/*IsMask=*/false, *PolicyTypes, UnMaskedHasPolicy,
P, Record.IsPrototypeDefaultTU);
}
}
if (!Record.HasMasked)
continue;
// Create masked intrinsic.
Optional<RVVTypes> MaskTypes =
RVVType::computeTypes(BaseType, Log2LMUL, Record.NF, ProtoMaskSeq);
InitRVVIntrinsic(Record, SuffixStr, OverloadedSuffixStr, true,
*MaskTypes, MaskedHasPolicy, Policy::PolicyNone,
Record.IsPrototypeDefaultTU);
if (Record.MaskedPolicyScheme == PolicyScheme::SchemeNone)
continue;
// Create masked policy intrinsic.
for (auto P : SupportedMaskedPolicies) {
llvm::SmallVector<PrototypeDescriptor> PolicyPrototype =
RVVIntrinsic::computeBuiltinTypes(
BasicProtoSeq, /*IsMasked=*/true, Record.HasMaskedOffOperand,
Record.HasVL, Record.NF, Record.IsPrototypeDefaultTU,
MaskedPolicyScheme, P);
Optional<RVVTypes> PolicyTypes = RVVType::computeTypes(
BaseType, Log2LMUL, Record.NF, PolicyPrototype);
InitRVVIntrinsic(Record, SuffixStr, OverloadedSuffixStr,
/*IsMask=*/true, *PolicyTypes, MaskedHasPolicy, P,
Record.IsPrototypeDefaultTU);
}
} // End for different LMUL
} // End for different TypeRange
}
}
// Compute name and signatures for intrinsic with practical types.
void RISCVIntrinsicManagerImpl::InitRVVIntrinsic(
const RVVIntrinsicRecord &Record, StringRef SuffixStr,
StringRef OverloadedSuffixStr, bool IsMasked, RVVTypes &Signature,
bool HasPolicy, Policy DefaultPolicy, bool IsPrototypeDefaultTU) {
// Function name, e.g. vadd_vv_i32m1.
std::string Name = Record.Name;
if (!SuffixStr.empty())
Name += "_" + SuffixStr.str();
// Overloaded function name, e.g. vadd.
std::string OverloadedName;
if (!Record.OverloadedName)
OverloadedName = StringRef(Record.Name).split("_").first.str();
else
OverloadedName = Record.OverloadedName;
if (!OverloadedSuffixStr.empty())
OverloadedName += "_" + OverloadedSuffixStr.str();
// clang built-in function name, e.g. __builtin_rvv_vadd.
std::string BuiltinName = "__builtin_rvv_" + std::string(Record.Name);
RVVIntrinsic::updateNamesAndPolicy(IsMasked, HasPolicy, IsPrototypeDefaultTU,
Name, BuiltinName, OverloadedName,
DefaultPolicy);
// Put into IntrinsicList.
size_t Index = IntrinsicList.size();
IntrinsicList.push_back({Name, OverloadedName, BuiltinName, Signature});
// Creating mapping to Intrinsics.
Intrinsics.insert({Name, Index});
// Get the RVVOverloadIntrinsicDef.
RVVOverloadIntrinsicDef &OverloadIntrinsicDef =
OverloadIntrinsics[OverloadedName];
// And added the index.
OverloadIntrinsicDef.Indexes.push_back(Index);
}
void RISCVIntrinsicManagerImpl::CreateRVVIntrinsicDecl(LookupResult &LR,
IdentifierInfo *II,
Preprocessor &PP,
unsigned Index,
bool IsOverload) {
ASTContext &Context = S.Context;
RVVIntrinsicDef &IDef = IntrinsicList[Index];
RVVTypes Sigs = IDef.Signature;
size_t SigLength = Sigs.size();
RVVType *ReturnType = Sigs[0];
QualType RetType = RVVType2Qual(Context, ReturnType);
SmallVector<QualType, 8> ArgTypes;
QualType BuiltinFuncType;
// Skip return type, and convert RVVType to QualType for arguments.
for (size_t i = 1; i < SigLength; ++i)
ArgTypes.push_back(RVVType2Qual(Context, Sigs[i]));
FunctionProtoType::ExtProtoInfo PI(
Context.getDefaultCallingConvention(false, false, true));
PI.Variadic = false;
SourceLocation Loc = LR.getNameLoc();
BuiltinFuncType = Context.getFunctionType(RetType, ArgTypes, PI);
DeclContext *Parent = Context.getTranslationUnitDecl();
FunctionDecl *RVVIntrinsicDecl = FunctionDecl::Create(
Context, Parent, Loc, Loc, II, BuiltinFuncType, /*TInfo=*/nullptr,
SC_Extern, S.getCurFPFeatures().isFPConstrained(),
/*isInlineSpecified*/ false,
/*hasWrittenPrototype*/ true);
// Create Decl objects for each parameter, adding them to the
// FunctionDecl.
const auto *FP = cast<FunctionProtoType>(BuiltinFuncType);
SmallVector<ParmVarDecl *, 8> ParmList;
for (unsigned IParm = 0, E = FP->getNumParams(); IParm != E; ++IParm) {
ParmVarDecl *Parm =
ParmVarDecl::Create(Context, RVVIntrinsicDecl, Loc, Loc, nullptr,
FP->getParamType(IParm), nullptr, SC_None, nullptr);
Parm->setScopeInfo(0, IParm);
ParmList.push_back(Parm);
}
RVVIntrinsicDecl->setParams(ParmList);
// Add function attributes.
if (IsOverload)
RVVIntrinsicDecl->addAttr(OverloadableAttr::CreateImplicit(Context));
// Setup alias to __builtin_rvv_*
IdentifierInfo &IntrinsicII = PP.getIdentifierTable().get(IDef.BuiltinName);
RVVIntrinsicDecl->addAttr(
BuiltinAliasAttr::CreateImplicit(S.Context, &IntrinsicII));
// Add to symbol table.
LR.addDecl(RVVIntrinsicDecl);
}
bool RISCVIntrinsicManagerImpl::CreateIntrinsicIfFound(LookupResult &LR,
IdentifierInfo *II,
Preprocessor &PP) {
StringRef Name = II->getName();
// Lookup the function name from the overload intrinsics first.
auto OvIItr = OverloadIntrinsics.find(Name);
if (OvIItr != OverloadIntrinsics.end()) {
const RVVOverloadIntrinsicDef &OvIntrinsicDef = OvIItr->second;
for (auto Index : OvIntrinsicDef.Indexes)
CreateRVVIntrinsicDecl(LR, II, PP, Index,
/*IsOverload*/ true);
// If we added overloads, need to resolve the lookup result.
LR.resolveKind();
return true;
}
// Lookup the function name from the intrinsics.
auto Itr = Intrinsics.find(Name);
if (Itr != Intrinsics.end()) {
CreateRVVIntrinsicDecl(LR, II, PP, Itr->second,
/*IsOverload*/ false);
return true;
}
// It's not an RVV intrinsics.
return false;
}
namespace clang {
std::unique_ptr<clang::sema::RISCVIntrinsicManager>
CreateRISCVIntrinsicManager(Sema &S) {
return std::make_unique<RISCVIntrinsicManagerImpl>(S);
}
} // namespace clang
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