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//===-- Target.cpp --------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/
//
//===----------------------------------------------------------------------===//
#include "Target.h"
#include "flang/Optimizer/Dialect/FIRType.h"
#include "flang/Optimizer/Support/KindMapping.h"
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/TypeRange.h"
#define DEBUG_TYPE "flang-codegen-target"
using namespace fir;
// Reduce a REAL/float type to the floating point semantics.
static const llvm::fltSemantics &floatToSemantics(const KindMapping &kindMap,
mlir::Type type) {
assert(isa_real(type));
if (auto ty = type.dyn_cast<fir::RealType>())
return kindMap.getFloatSemantics(ty.getFKind());
return type.cast<mlir::FloatType>().getFloatSemantics();
}
namespace {
template <typename S>
struct GenericTarget : public CodeGenSpecifics {
using CodeGenSpecifics::CodeGenSpecifics;
using AT = CodeGenSpecifics::Attributes;
mlir::Type complexMemoryType(mlir::Type eleTy) const override {
assert(fir::isa_real(eleTy));
// Use a type that will be translated into LLVM as:
// { t, t } struct of 2 eleTy
mlir::TypeRange range = {eleTy, eleTy};
return mlir::TupleType::get(eleTy.getContext(), range);
}
mlir::Type boxcharMemoryType(mlir::Type eleTy) const override {
auto idxTy = mlir::IntegerType::get(eleTy.getContext(), S::defaultWidth);
auto ptrTy = fir::ReferenceType::get(eleTy);
// Use a type that will be translated into LLVM as:
// { t*, index }
mlir::TypeRange range = {ptrTy, idxTy};
return mlir::TupleType::get(eleTy.getContext(), range);
}
Marshalling boxcharArgumentType(mlir::Type eleTy, bool sret) const override {
CodeGenSpecifics::Marshalling marshal;
auto idxTy = mlir::IntegerType::get(eleTy.getContext(), S::defaultWidth);
auto ptrTy = fir::ReferenceType::get(eleTy);
marshal.emplace_back(ptrTy, AT{});
// Return value arguments are grouped as a pair. Others are passed in a
// split format with all pointers first (in the declared position) and all
// LEN arguments appended after all of the dummy arguments.
// NB: Other conventions/ABIs can/should be supported via options.
marshal.emplace_back(idxTy, AT{/*alignment=*/0, /*byval=*/false,
/*sret=*/sret, /*append=*/!sret});
return marshal;
}
};
} // namespace
//===----------------------------------------------------------------------===//
// i386 (x86 32 bit) linux target specifics.
//===----------------------------------------------------------------------===//
namespace {
struct TargetI386 : public GenericTarget<TargetI386> {
using GenericTarget::GenericTarget;
static constexpr int defaultWidth = 32;
CodeGenSpecifics::Marshalling
complexArgumentType(mlir::Type eleTy) const override {
assert(fir::isa_real(eleTy));
CodeGenSpecifics::Marshalling marshal;
// Use a type that will be translated into LLVM as:
// { t, t } struct of 2 eleTy, byval, align 4
mlir::TypeRange range = {eleTy, eleTy};
auto structTy = mlir::TupleType::get(eleTy.getContext(), range);
marshal.emplace_back(fir::ReferenceType::get(structTy),
AT{/*alignment=*/4, /*byval=*/true});
return marshal;
}
CodeGenSpecifics::Marshalling
complexReturnType(mlir::Type eleTy) const override {
assert(fir::isa_real(eleTy));
CodeGenSpecifics::Marshalling marshal;
const auto *sem = &floatToSemantics(kindMap, eleTy);
if (sem == &llvm::APFloat::IEEEsingle()) {
// i64 pack both floats in a 64-bit GPR
marshal.emplace_back(mlir::IntegerType::get(eleTy.getContext(), 64),
AT{});
} else if (sem == &llvm::APFloat::IEEEdouble()) {
// Use a type that will be translated into LLVM as:
// { t, t } struct of 2 eleTy, sret, align 4
mlir::TypeRange range = {eleTy, eleTy};
auto structTy = mlir::TupleType::get(eleTy.getContext(), range);
marshal.emplace_back(fir::ReferenceType::get(structTy),
AT{/*alignment=*/4, /*byval=*/false, /*sret=*/true});
} else {
llvm::report_fatal_error("complex for this precision not implemented");
}
return marshal;
}
};
} // namespace
//===----------------------------------------------------------------------===//
// x86_64 (x86 64 bit) linux target specifics.
//===----------------------------------------------------------------------===//
namespace {
struct TargetX86_64 : public GenericTarget<TargetX86_64> {
using GenericTarget::GenericTarget;
static constexpr int defaultWidth = 64;
CodeGenSpecifics::Marshalling
complexArgumentType(mlir::Type eleTy) const override {
CodeGenSpecifics::Marshalling marshal;
const auto *sem = &floatToSemantics(kindMap, eleTy);
if (sem == &llvm::APFloat::IEEEsingle()) {
// <2 x t> vector of 2 eleTy
marshal.emplace_back(fir::VectorType::get(2, eleTy), AT{});
} else if (sem == &llvm::APFloat::IEEEdouble()) {
// two distinct double arguments
marshal.emplace_back(eleTy, AT{});
marshal.emplace_back(eleTy, AT{});
} else {
llvm::report_fatal_error("complex for this precision not implemented");
}
return marshal;
}
CodeGenSpecifics::Marshalling
complexReturnType(mlir::Type eleTy) const override {
CodeGenSpecifics::Marshalling marshal;
const auto *sem = &floatToSemantics(kindMap, eleTy);
if (sem == &llvm::APFloat::IEEEsingle()) {
// <2 x t> vector of 2 eleTy
marshal.emplace_back(fir::VectorType::get(2, eleTy), AT{});
} else if (sem == &llvm::APFloat::IEEEdouble()) {
// Use a type that will be translated into LLVM as:
// { double, double } struct of 2 double
mlir::TypeRange range = {eleTy, eleTy};
marshal.emplace_back(mlir::TupleType::get(eleTy.getContext(), range),
AT{});
} else {
llvm::report_fatal_error("complex for this precision not implemented");
}
return marshal;
}
};
} // namespace
//===----------------------------------------------------------------------===//
// AArch64 linux target specifics.
//===----------------------------------------------------------------------===//
namespace {
struct TargetAArch64 : public GenericTarget<TargetAArch64> {
using GenericTarget::GenericTarget;
static constexpr int defaultWidth = 64;
CodeGenSpecifics::Marshalling
complexArgumentType(mlir::Type eleTy) const override {
CodeGenSpecifics::Marshalling marshal;
const auto *sem = &floatToSemantics(kindMap, eleTy);
if (sem == &llvm::APFloat::IEEEsingle() ||
sem == &llvm::APFloat::IEEEdouble()) {
// [2 x t] array of 2 eleTy
marshal.emplace_back(fir::SequenceType::get({2}, eleTy), AT{});
} else {
llvm::report_fatal_error("complex for this precision not implemented");
}
return marshal;
}
CodeGenSpecifics::Marshalling
complexReturnType(mlir::Type eleTy) const override {
CodeGenSpecifics::Marshalling marshal;
const auto *sem = &floatToSemantics(kindMap, eleTy);
if (sem == &llvm::APFloat::IEEEsingle() ||
sem == &llvm::APFloat::IEEEdouble()) {
// Use a type that will be translated into LLVM as:
// { t, t } struct of 2 eleTy
mlir::TypeRange range = {eleTy, eleTy};
marshal.emplace_back(mlir::TupleType::get(eleTy.getContext(), range),
AT{});
} else {
llvm::report_fatal_error("complex for this precision not implemented");
}
return marshal;
}
};
} // namespace
//===----------------------------------------------------------------------===//
// PPC64le linux target specifics.
//===----------------------------------------------------------------------===//
namespace {
struct TargetPPC64le : public GenericTarget<TargetPPC64le> {
using GenericTarget::GenericTarget;
static constexpr int defaultWidth = 64;
CodeGenSpecifics::Marshalling
complexArgumentType(mlir::Type eleTy) const override {
CodeGenSpecifics::Marshalling marshal;
// two distinct element type arguments (re, im)
marshal.emplace_back(eleTy, AT{});
marshal.emplace_back(eleTy, AT{});
return marshal;
}
CodeGenSpecifics::Marshalling
complexReturnType(mlir::Type eleTy) const override {
CodeGenSpecifics::Marshalling marshal;
// Use a type that will be translated into LLVM as:
// { t, t } struct of 2 element type
mlir::TypeRange range = {eleTy, eleTy};
marshal.emplace_back(mlir::TupleType::get(eleTy.getContext(), range), AT{});
return marshal;
}
};
} // namespace
// Instantiate the overloaded target instance based on the triple value.
// Currently, the implementation only instantiates `i386-unknown-linux-gnu`,
// `x86_64-unknown-linux-gnu`, aarch64 and ppc64le like triples. Other targets
// should be added to this file as needed.
std::unique_ptr<fir::CodeGenSpecifics>
fir::CodeGenSpecifics::get(mlir::MLIRContext *ctx, llvm::Triple &&trp,
KindMapping &&kindMap) {
switch (trp.getArch()) {
default:
break;
case llvm::Triple::ArchType::x86:
switch (trp.getOS()) {
default:
break;
case llvm::Triple::OSType::Linux:
case llvm::Triple::OSType::Darwin:
return std::make_unique<TargetI386>(ctx, std::move(trp),
std::move(kindMap));
}
break;
case llvm::Triple::ArchType::x86_64:
switch (trp.getOS()) {
default:
break;
case llvm::Triple::OSType::Linux:
case llvm::Triple::OSType::Darwin:
return std::make_unique<TargetX86_64>(ctx, std::move(trp),
std::move(kindMap));
}
break;
case llvm::Triple::ArchType::aarch64:
switch (trp.getOS()) {
default:
break;
case llvm::Triple::OSType::Linux:
case llvm::Triple::OSType::Darwin:
return std::make_unique<TargetAArch64>(ctx, std::move(trp),
std::move(kindMap));
}
break;
case llvm::Triple::ArchType::ppc64le:
switch (trp.getOS()) {
default:
break;
case llvm::Triple::OSType::Linux:
return std::make_unique<TargetPPC64le>(ctx, std::move(trp),
std::move(kindMap));
}
break;
}
llvm::report_fatal_error("target not implemented");
}
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