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llvm-project/flang/lib/Evaluate/fold-logical.cpp

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//===-- lib/Evaluate/fold-logical.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
//
//===----------------------------------------------------------------------===//
#include "fold-implementation.h"
#include "fold-reduction.h"
#include "flang/Evaluate/check-expression.h"
namespace Fortran::evaluate {
// for ALL & ANY
template <typename T>
static Expr<T> FoldAllAny(FoldingContext &context, FunctionRef<T> &&ref,
Scalar<T> (Scalar<T>::*operation)(const Scalar<T> &) const,
Scalar<T> identity) {
static_assert(T::category == TypeCategory::Logical);
using Element = Scalar<T>;
std::optional<int> dim;
if (std::optional<Constant<T>> array{
ProcessReductionArgs<T>(context, ref.arguments(), dim, identity,
/*ARRAY(MASK)=*/0, /*DIM=*/1)}) {
auto accumulator{[&](Element &element, const ConstantSubscripts &at) {
element = (element.*operation)(array->At(at));
}};
return Expr<T>{DoReduction<T>(*array, dim, identity, accumulator)};
}
return Expr<T>{std::move(ref)};
}
template <int KIND>
Expr<Type<TypeCategory::Logical, KIND>> FoldIntrinsicFunction(
FoldingContext &context,
FunctionRef<Type<TypeCategory::Logical, KIND>> &&funcRef) {
using T = Type<TypeCategory::Logical, KIND>;
ActualArguments &args{funcRef.arguments()};
auto *intrinsic{std::get_if<SpecificIntrinsic>(&funcRef.proc().u)};
CHECK(intrinsic);
std::string name{intrinsic->name};
using SameInt = Type<TypeCategory::Integer, KIND>;
if (name == "all") {
return FoldAllAny(
context, std::move(funcRef), &Scalar<T>::AND, Scalar<T>{true});
} else if (name == "any") {
return FoldAllAny(
context, std::move(funcRef), &Scalar<T>::OR, Scalar<T>{false});
} else if (name == "associated") {
bool gotConstant{true};
const Expr<SomeType> *firstArgExpr{args[0]->UnwrapExpr()};
if (!firstArgExpr || !IsNullPointer(*firstArgExpr)) {
gotConstant = false;
} else if (args[1]) { // There's a second argument
const Expr<SomeType> *secondArgExpr{args[1]->UnwrapExpr()};
if (!secondArgExpr || !IsNullPointer(*secondArgExpr)) {
gotConstant = false;
}
}
return gotConstant ? Expr<T>{false} : Expr<T>{std::move(funcRef)};
} else if (name == "bge" || name == "bgt" || name == "ble" || name == "blt") {
static_assert(std::is_same_v<Scalar<LargestInt>, BOZLiteralConstant>);
// Arguments do not have to be of the same integer type. Convert all
// arguments to the biggest integer type before comparing them to
// simplify.
for (int i{0}; i <= 1; ++i) {
if (auto *x{UnwrapExpr<Expr<SomeInteger>>(args[i])}) {
*args[i] = AsGenericExpr(
Fold(context, ConvertToType<LargestInt>(std::move(*x))));
} else if (auto *x{UnwrapExpr<BOZLiteralConstant>(args[i])}) {
*args[i] = AsGenericExpr(Constant<LargestInt>{std::move(*x)});
}
}
auto fptr{&Scalar<LargestInt>::BGE};
if (name == "bge") { // done in fptr declaration
} else if (name == "bgt") {
fptr = &Scalar<LargestInt>::BGT;
} else if (name == "ble") {
fptr = &Scalar<LargestInt>::BLE;
} else if (name == "blt") {
fptr = &Scalar<LargestInt>::BLT;
} else {
common::die("missing case to fold intrinsic function %s", name.c_str());
}
return FoldElementalIntrinsic<T, LargestInt, LargestInt>(context,
std::move(funcRef),
ScalarFunc<T, LargestInt, LargestInt>(
[&fptr](const Scalar<LargestInt> &i, const Scalar<LargestInt> &j) {
return Scalar<T>{std::invoke(fptr, i, j)};
}));
} else if (name == "btest") {
if (const auto *ix{UnwrapExpr<Expr<SomeInteger>>(args[0])}) {
return common::visit(
[&](const auto &x) {
using IT = ResultType<decltype(x)>;
return FoldElementalIntrinsic<T, IT, SameInt>(context,
std::move(funcRef),
ScalarFunc<T, IT, SameInt>(
[&](const Scalar<IT> &x, const Scalar<SameInt> &pos) {
auto posVal{pos.ToInt64()};
if (posVal < 0 || posVal >= x.bits) {
context.messages().Say(
"POS=%jd out of range for BTEST"_err_en_US,
static_cast<std::intmax_t>(posVal));
}
return Scalar<T>{x.BTEST(posVal)};
}));
},
ix->u);
}
} else if (name == "extends_type_of") {
// Type extension testing with EXTENDS_TYPE_OF() ignores any type
// parameters. Returns a constant truth value when the result is known now.
if (args[0] && args[1]) {
auto t0{args[0]->GetType()};
auto t1{args[1]->GetType()};
if (t0 && t1) {
if (auto result{t0->ExtendsTypeOf(*t1)}) {
return Expr<T>{*result};
}
}
}
} else if (name == "isnan" || name == "__builtin_ieee_is_nan") {
// A warning about an invalid argument is discarded from converting
// the argument of isnan() / IEEE_IS_NAN().
auto restorer{context.messages().DiscardMessages()};
using DefaultReal = Type<TypeCategory::Real, 4>;
return FoldElementalIntrinsic<T, DefaultReal>(context, std::move(funcRef),
ScalarFunc<T, DefaultReal>([](const Scalar<DefaultReal> &x) {
return Scalar<T>{x.IsNotANumber()};
}));
} else if (name == "__builtin_ieee_is_negative") {
auto restorer{context.messages().DiscardMessages()};
using DefaultReal = Type<TypeCategory::Real, 4>;
return FoldElementalIntrinsic<T, DefaultReal>(context, std::move(funcRef),
ScalarFunc<T, DefaultReal>([](const Scalar<DefaultReal> &x) {
return Scalar<T>{x.IsNegative()};
}));
} else if (name == "__builtin_ieee_is_normal") {
auto restorer{context.messages().DiscardMessages()};
using DefaultReal = Type<TypeCategory::Real, 4>;
return FoldElementalIntrinsic<T, DefaultReal>(context, std::move(funcRef),
ScalarFunc<T, DefaultReal>([](const Scalar<DefaultReal> &x) {
return Scalar<T>{x.IsNormal()};
}));
} else if (name == "is_contiguous") {
if (args.at(0)) {
if (auto *expr{args[0]->UnwrapExpr()}) {
if (IsSimplyContiguous(*expr, context)) {
return Expr<T>{true};
}
}
}
} else if (name == "lge" || name == "lgt" || name == "lle" || name == "llt") {
// Rewrite LGE/LGT/LLE/LLT into ASCII character relations
auto *cx0{UnwrapExpr<Expr<SomeCharacter>>(args[0])};
auto *cx1{UnwrapExpr<Expr<SomeCharacter>>(args[1])};
if (cx0 && cx1) {
return Fold(context,
ConvertToType<T>(
PackageRelation(name == "lge" ? RelationalOperator::GE
: name == "lgt" ? RelationalOperator::GT
: name == "lle" ? RelationalOperator::LE
: RelationalOperator::LT,
ConvertToType<Ascii>(std::move(*cx0)),
ConvertToType<Ascii>(std::move(*cx1)))));
}
} else if (name == "logical") {
if (auto *expr{UnwrapExpr<Expr<SomeLogical>>(args[0])}) {
return Fold(context, ConvertToType<T>(std::move(*expr)));
}
} else if (name == "merge") {
return FoldMerge<T>(context, std::move(funcRef));
} else if (name == "same_type_as") {
// Type equality testing with SAME_TYPE_AS() ignores any type parameters.
// Returns a constant truth value when the result is known now.
if (args[0] && args[1]) {
auto t0{args[0]->GetType()};
auto t1{args[1]->GetType()};
if (t0 && t1) {
if (auto result{t0->SameTypeAs(*t1)}) {
return Expr<T>{*result};
}
}
}
} else if (name == "__builtin_ieee_support_datatype" ||
name == "__builtin_ieee_support_denormal" ||
name == "__builtin_ieee_support_divide" ||
name == "__builtin_ieee_support_divide" ||
name == "__builtin_ieee_support_inf" ||
name == "__builtin_ieee_support_io" ||
name == "__builtin_ieee_support_nan" ||
name == "__builtin_ieee_support_sqrt" ||
name == "__builtin_ieee_support_standard" ||
name == "__builtin_ieee_support_subnormal" ||
name == "__builtin_ieee_support_underflow_control") {
return Expr<T>{true};
}
// TODO: dot_product, is_iostat_end,
// is_iostat_eor, logical, matmul, out_of_range,
// parity
return Expr<T>{std::move(funcRef)};
}
template <typename T>
Expr<LogicalResult> FoldOperation(
FoldingContext &context, Relational<T> &&relation) {
if (auto array{ApplyElementwise(context, relation,
std::function<Expr<LogicalResult>(Expr<T> &&, Expr<T> &&)>{
[=](Expr<T> &&x, Expr<T> &&y) {
return Expr<LogicalResult>{Relational<SomeType>{
Relational<T>{relation.opr, std::move(x), std::move(y)}}};
}})}) {
return *array;
}
if (auto folded{OperandsAreConstants(relation)}) {
bool result{};
if constexpr (T::category == TypeCategory::Integer) {
result =
Satisfies(relation.opr, folded->first.CompareSigned(folded->second));
} else if constexpr (T::category == TypeCategory::Real) {
result = Satisfies(relation.opr, folded->first.Compare(folded->second));
} else if constexpr (T::category == TypeCategory::Complex) {
result = (relation.opr == RelationalOperator::EQ) ==
folded->first.Equals(folded->second);
} else if constexpr (T::category == TypeCategory::Character) {
result = Satisfies(relation.opr, Compare(folded->first, folded->second));
} else {
static_assert(T::category != TypeCategory::Logical);
}
return Expr<LogicalResult>{Constant<LogicalResult>{result}};
}
return Expr<LogicalResult>{Relational<SomeType>{std::move(relation)}};
}
Expr<LogicalResult> FoldOperation(
FoldingContext &context, Relational<SomeType> &&relation) {
return common::visit(
[&](auto &&x) {
return Expr<LogicalResult>{FoldOperation(context, std::move(x))};
},
std::move(relation.u));
}
template <int KIND>
Expr<Type<TypeCategory::Logical, KIND>> FoldOperation(
FoldingContext &context, Not<KIND> &&x) {
if (auto array{ApplyElementwise(context, x)}) {
return *array;
}
using Ty = Type<TypeCategory::Logical, KIND>;
auto &operand{x.left()};
if (auto value{GetScalarConstantValue<Ty>(operand)}) {
return Expr<Ty>{Constant<Ty>{!value->IsTrue()}};
}
return Expr<Ty>{x};
}
template <int KIND>
Expr<Type<TypeCategory::Logical, KIND>> FoldOperation(
FoldingContext &context, LogicalOperation<KIND> &&operation) {
using LOGICAL = Type<TypeCategory::Logical, KIND>;
if (auto array{ApplyElementwise(context, operation,
std::function<Expr<LOGICAL>(Expr<LOGICAL> &&, Expr<LOGICAL> &&)>{
[=](Expr<LOGICAL> &&x, Expr<LOGICAL> &&y) {
return Expr<LOGICAL>{LogicalOperation<KIND>{
operation.logicalOperator, std::move(x), std::move(y)}};
}})}) {
return *array;
}
if (auto folded{OperandsAreConstants(operation)}) {
bool xt{folded->first.IsTrue()}, yt{folded->second.IsTrue()}, result{};
switch (operation.logicalOperator) {
case LogicalOperator::And:
result = xt && yt;
break;
case LogicalOperator::Or:
result = xt || yt;
break;
case LogicalOperator::Eqv:
result = xt == yt;
break;
case LogicalOperator::Neqv:
result = xt != yt;
break;
case LogicalOperator::Not:
DIE("not a binary operator");
}
return Expr<LOGICAL>{Constant<LOGICAL>{result}};
}
return Expr<LOGICAL>{std::move(operation)};
}
#ifdef _MSC_VER // disable bogus warning about missing definitions
#pragma warning(disable : 4661)
#endif
FOR_EACH_LOGICAL_KIND(template class ExpressionBase, )
template class ExpressionBase<SomeLogical>;
} // namespace Fortran::evaluate
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