e850b8d90b
Original-commit: flang-compiler/f18@030347a906 Reviewed-on: https://github.com/flang-compiler/f18/pull/101 Tree-same-pre-rewrite: false
102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FORTRAN_EVALUATE_COMMON_H_
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#define FORTRAN_EVALUATE_COMMON_H_
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#include <cinttypes>
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namespace Fortran::evaluate {
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// Integers are always ordered; reals may not be.
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enum class Ordering { Less, Equal, Greater };
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enum class Relation { Less, Equal, Greater, Unordered };
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static constexpr Ordering Reverse(Ordering ordering) {
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if (ordering == Ordering::Less) {
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return Ordering::Greater;
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} else if (ordering == Ordering::Greater) {
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return Ordering::Less;
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} else {
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return Ordering::Equal;
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}
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}
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static constexpr Relation RelationFromOrdering(Ordering ordering) {
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if (ordering == Ordering::Less) {
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return Relation::Less;
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} else if (ordering == Ordering::Greater) {
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return Relation::Greater;
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} else {
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return Relation::Equal;
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}
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}
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static constexpr Relation Reverse(Relation relation) {
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if (relation == Relation::Less) {
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return Relation::Greater;
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} else if (relation == Relation::Greater) {
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return Relation::Less;
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} else {
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return relation;
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}
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}
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namespace RealFlag {
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enum {
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Ok = 0,
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Overflow = 1,
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DivideByZero = 2,
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InvalidArgument = 4,
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Underflow = 8,
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Inexact = 16
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};
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} // namespace RealFlag
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template<typename A> struct ValueWithRealFlags {
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A value;
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int flags{RealFlag::Ok};
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};
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enum class Rounding { TiesToEven, ToZero, Down, Up, TiesAwayFromZero };
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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constexpr bool IsHostLittleEndian{false};
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#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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constexpr bool IsHostLittleEndian{true};
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#else
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#error host endianness is not known
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#endif
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// HostUnsignedInt<BITS> finds the smallest native unsigned integer type
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// whose size is >= BITS.
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template<bool LE8, bool LE16, bool LE32, bool LE64> struct SmallestUInt {};
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template<> struct SmallestUInt<true, true, true, true> {
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using type = std::uint8_t;
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};
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template<> struct SmallestUInt<false, true, true, true> {
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using type = std::uint16_t;
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};
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template<> struct SmallestUInt<false, false, true, true> {
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using type = std::uint32_t;
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};
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template<> struct SmallestUInt<false, false, false, true> {
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using type = std::uint64_t;
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};
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template<int BITS>
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using HostUnsignedInt =
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typename SmallestUInt<BITS <= 8, BITS <= 16, BITS <= 32, BITS <= 64>::type;
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} // namespace Fortran::evaluate
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#endif // FORTRAN_EVALUATE_COMMON_H_
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