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//===-- lib/Evaluate/intrinsics-library-templates.h -------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef FORTRAN_EVALUATE_INTRINSICS_LIBRARY_TEMPLATES_H_
#define FORTRAN_EVALUATE_INTRINSICS_LIBRARY_TEMPLATES_H_
// This header defines the actual implementation of the templatized member
// function of the structures defined in intrinsics-library.h. It should only be
// included if these member functions are used, else intrinsics-library.h is
// sufficient. This is to avoid circular dependencies. The below implementation
// cannot be defined in .cpp file because it would be too cumbersome to decide
// which version should be instantiated in a generic way.
#include "host.h"
#include "flang/Common/template.h"
#include "flang/Evaluate/intrinsics-library.h"
#include "flang/Evaluate/type.h"
#include <tuple>
#include <type_traits>
namespace Fortran::evaluate {
// Define meaningful types for the runtime
using RuntimeTypes = evaluate::AllIntrinsicTypes;
template <typename T, typename... TT> struct IndexInTupleHelper {};
template <typename T, typename... TT>
struct IndexInTupleHelper<T, std::tuple<TT...>> {
static constexpr TypeCode value{common::TypeIndex<T, TT...>};
};
static_assert(
std::tuple_size_v<RuntimeTypes> < std::numeric_limits<TypeCode>::max(),
"TypeCode is too small");
template <typename T>
inline constexpr TypeCode typeCodeOf{
IndexInTupleHelper<T, RuntimeTypes>::value};
template <TypeCode n>
using RuntimeTypeOf = typename std::tuple_element_t<n, RuntimeTypes>;
template <typename TA, PassBy Pass>
using HostArgType = std::conditional_t<Pass == PassBy::Ref,
std::add_lvalue_reference_t<std::add_const_t<host::HostType<TA>>>,
host::HostType<TA>>;
template <typename TR, typename... ArgInfo>
using HostFuncPointer = FuncPointer<host::HostType<TR>,
HostArgType<typename ArgInfo::Type, ArgInfo::pass>...>;
// Software Subnormal Flushing helper.
template <typename T> struct Flusher {
// Only flush floating-points. Forward other scalars untouched.
static constexpr inline const Scalar<T> &FlushSubnormals(const Scalar<T> &x) {
return x;
}
};
template <int Kind> struct Flusher<Type<TypeCategory::Real, Kind>> {
using T = Type<TypeCategory::Real, Kind>;
static constexpr inline Scalar<T> FlushSubnormals(const Scalar<T> &x) {
return x.FlushSubnormalToZero();
}
};
template <int Kind> struct Flusher<Type<TypeCategory::Complex, Kind>> {
using T = Type<TypeCategory::Complex, Kind>;
static constexpr inline Scalar<T> FlushSubnormals(const Scalar<T> &x) {
return x.FlushSubnormalToZero();
}
};
// Callable factory
template <typename TR, typename... ArgInfo> struct CallableHostWrapper {
static Scalar<TR> scalarCallable(FoldingContext &context,
HostFuncPointer<TR, ArgInfo...> func,
const Scalar<typename ArgInfo::Type> &... x) {
if constexpr (host::HostTypeExists<TR, typename ArgInfo::Type...>()) {
host::HostFloatingPointEnvironment hostFPE;
hostFPE.SetUpHostFloatingPointEnvironment(context);
host::HostType<TR> hostResult{};
Scalar<TR> result{};
if (context.flushSubnormalsToZero() &&
!hostFPE.hasSubnormalFlushingHardwareControl()) {
hostResult = func(host::CastFortranToHost<typename ArgInfo::Type>(
Flusher<typename ArgInfo::Type>::FlushSubnormals(x))...);
result = Flusher<TR>::FlushSubnormals(
host::CastHostToFortran<TR>(hostResult));
} else {
hostResult =
func(host::CastFortranToHost<typename ArgInfo::Type>(x)...);
result = host::CastHostToFortran<TR>(hostResult);
}
if (!hostFPE.hardwareFlagsAreReliable()) {
CheckFloatingPointIssues(hostFPE, result);
}
hostFPE.CheckAndRestoreFloatingPointEnvironment(context);
return result;
} else {
common::die("Internal error: Host does not supports this function type."
"This should not have been called for folding");
}
}
static constexpr inline auto MakeScalarCallable() { return &scalarCallable; }
static void CheckFloatingPointIssues(
host::HostFloatingPointEnvironment &hostFPE, const Scalar<TR> &x) {
if constexpr (TR::category == TypeCategory::Complex ||
TR::category == TypeCategory::Real) {
if (x.IsNotANumber()) {
hostFPE.SetFlag(RealFlag::InvalidArgument);
} else if (x.IsInfinite()) {
hostFPE.SetFlag(RealFlag::Overflow);
}
}
}
};
template <typename TR, typename... TA>
inline GenericFunctionPointer ToGenericFunctionPointer(
FuncPointer<TR, TA...> f) {
return reinterpret_cast<GenericFunctionPointer>(f);
}
template <typename TR, typename... TA>
inline FuncPointer<TR, TA...> FromGenericFunctionPointer(
GenericFunctionPointer g) {
return reinterpret_cast<FuncPointer<TR, TA...>>(g);
}
template <typename TR, typename... ArgInfo>
IntrinsicProcedureRuntimeDescription::IntrinsicProcedureRuntimeDescription(
const Signature<TR, ArgInfo...> &signature, bool isElemental)
: name{signature.name}, returnType{typeCodeOf<TR>},
argumentsType{typeCodeOf<typename ArgInfo::Type>...},
argumentsPassedBy{ArgInfo::pass...}, isElemental{isElemental},
callable{ToGenericFunctionPointer(
CallableHostWrapper<TR, ArgInfo...>::MakeScalarCallable())} {}
template <typename HostTA> static constexpr inline PassBy PassByMethod() {
if constexpr (std::is_pointer_v<std::decay_t<HostTA>> ||
std::is_lvalue_reference_v<HostTA>) {
return PassBy::Ref;
}
return PassBy::Val;
}
template <typename HostTA>
using ArgInfoFromHostType =
ArgumentInfo<host::FortranType<std::remove_pointer_t<std::decay_t<HostTA>>>,
PassByMethod<HostTA>()>;
template <typename HostTR, typename... HostTA>
using SignatureFromHostFuncPointer =
Signature<host::FortranType<HostTR>, ArgInfoFromHostType<HostTA>...>;
template <typename HostTR, typename... HostTA>
HostRuntimeIntrinsicProcedure::HostRuntimeIntrinsicProcedure(
const std::string &name, FuncPointer<HostTR, HostTA...> func,
bool isElemental)
: IntrinsicProcedureRuntimeDescription(
SignatureFromHostFuncPointer<HostTR, HostTA...>{name}, isElemental),
handle{ToGenericFunctionPointer(func)} {}
template <template <typename> typename ConstantContainer, typename TR,
typename... TA>
std::optional<HostProcedureWrapper<ConstantContainer, TR, TA...>>
HostIntrinsicProceduresLibrary::GetHostProcedureWrapper(
const std::string &name) const {
if constexpr (host::HostTypeExists<TR, TA...>()) {
auto rteProcRange{procedures_.equal_range(name)};
const TypeCode resTypeCode{typeCodeOf<TR>};
const std::vector<TypeCode> argTypes{typeCodeOf<TA>...};
const size_t nargs{argTypes.size()};
for (auto iter{rteProcRange.first}; iter != rteProcRange.second; ++iter) {
if (nargs == iter->second.argumentsType.size() &&
resTypeCode == iter->second.returnType &&
(!std::is_same_v<ConstantContainer<TR>, Scalar<TR>> ||
iter->second.isElemental)) {
bool match{true};
int pos{0};
for (auto const &type : argTypes) {
if (type != iter->second.argumentsType[pos++]) {
match = false;
break;
}
}
if (match) {
return {HostProcedureWrapper<ConstantContainer, TR, TA...>{
[=](FoldingContext &context,
const ConstantContainer<TA> &... args) {
auto callable{FromGenericFunctionPointer<ConstantContainer<TR>,
FoldingContext &, GenericFunctionPointer,
const ConstantContainer<TA> &...>(iter->second.callable)};
return callable(context, iter->second.handle, args...);
}}};
}
}
}
}
return std::nullopt;
}
} // namespace Fortran::evaluate
#endif // FORTRAN_EVALUATE_INTRINSICS_LIBRARY_TEMPLATES_H_
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