1//===-- lib/Evaluate/fold-complex.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 "fold-implementation.h"
10#include "fold-matmul.h"
11#include "fold-reduction.h"
12
13namespace Fortran::evaluate {
14
15template <int KIND>
16Expr<Type<TypeCategory::Complex, KIND>> FoldIntrinsicFunction(
17 FoldingContext &context,
18 FunctionRef<Type<TypeCategory::Complex, KIND>> &&funcRef) {
19 using T = Type<TypeCategory::Complex, KIND>;
20 using Part = typename T::Part;
21 ActualArguments &args{funcRef.arguments()};
22 auto *intrinsic{std::get_if<SpecificIntrinsic>(&funcRef.proc().u)};
23 CHECK(intrinsic);
24 std::string name{intrinsic->name};
25 if (name == "acos" || name == "acosh" || name == "asin" || name == "asinh" ||
26 name == "atan" || name == "atanh" || name == "cos" || name == "cosh" ||
27 name == "exp" || name == "log" || name == "sin" || name == "sinh" ||
28 name == "sqrt" || name == "tan" || name == "tanh") {
29 if (auto callable{GetHostRuntimeWrapper<T, T>(name)}) {
30 return FoldElementalIntrinsic<T, T>(
31 context, std::move(funcRef), *callable);
32 } else if (context.languageFeatures().ShouldWarn(
33 common::UsageWarning::FoldingFailure)) {
34 context.messages().Say(common::UsageWarning::FoldingFailure,
35 "%s(complex(kind=%d)) cannot be folded on host"_warn_en_US, name,
36 KIND);
37 }
38 } else if (name == "conjg") {
39 return FoldElementalIntrinsic<T, T>(
40 context, std::move(funcRef), &Scalar<T>::CONJG);
41 } else if (name == "cmplx") {
42 if (args.size() > 0 && args[0].has_value()) {
43 if (auto *x{UnwrapExpr<Expr<SomeComplex>>(args[0])}) {
44 // CMPLX(X [, KIND]) with complex X
45 return Fold(context, ConvertToType<T>(std::move(*x)));
46 } else {
47 if (args.size() >= 2 && args[1].has_value()) {
48 // Do not fold CMPLX with an Y argument that may be absent at runtime
49 // into a complex constructor so that lowering can deal with the
50 // optional aspect (there is no optional aspect with the complex
51 // constructor).
52 if (MayBePassedAsAbsentOptional(*args[1]->UnwrapExpr())) {
53 return Expr<T>{std::move(funcRef)};
54 }
55 }
56 // CMPLX(X [, Y [, KIND]]) with non-complex X
57 Expr<SomeType> re{std::move(*args[0].value().UnwrapExpr())};
58 Expr<SomeType> im{args.size() >= 2 && args[1].has_value()
59 ? std::move(*args[1]->UnwrapExpr())
60 : AsGenericExpr(Constant<Part>{Scalar<Part>{}})};
61 return Fold(context,
62 Expr<T>{
63 ComplexConstructor<KIND>{ToReal<KIND>(context, std::move(re)),
64 ToReal<KIND>(context, std::move(im))}});
65 }
66 }
67 } else if (name == "dot_product") {
68 return FoldDotProduct<T>(context, std::move(funcRef));
69 } else if (name == "matmul") {
70 return FoldMatmul(context, std::move(funcRef));
71 } else if (name == "product") {
72 auto one{Scalar<Part>::FromInteger(value::Integer<8>{1}).value};
73 return FoldProduct<T>(context, std::move(funcRef), Scalar<T>{one});
74 } else if (name == "sum") {
75 return FoldSum<T>(context, std::move(funcRef));
76 }
77 return Expr<T>{std::move(funcRef)};
78}
79
80template <int KIND>
81Expr<Type<TypeCategory::Complex, KIND>> FoldOperation(
82 FoldingContext &context, ComplexConstructor<KIND> &&x) {
83 if (auto array{ApplyElementwise(context, x)}) {
84 return *array;
85 }
86 using Result = Type<TypeCategory::Complex, KIND>;
87 if (auto folded{OperandsAreConstants(x)}) {
88 return Expr<Result>{
89 Constant<Result>{Scalar<Result>{folded->first, folded->second}}};
90 }
91 return Expr<Result>{std::move(x)};
92}
93
94#ifdef _MSC_VER // disable bogus warning about missing definitions
95#pragma warning(disable : 4661)
96#endif
97FOR_EACH_COMPLEX_KIND(template class ExpressionBase, )
98template class ExpressionBase<SomeComplex>;
99} // namespace Fortran::evaluate
100

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source code of flang/lib/Evaluate/fold-complex.cpp