52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
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* Copyright (C) 2017 The Android Open Source Project
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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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*/
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#pragma once
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// compatibility with non-clang compilers...
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#ifndef __has_attribute
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#define __has_attribute(x) 0
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#endif
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#if __has_builtin(__builtin_expect)
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# ifdef __cplusplus
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# define MATH_LIKELY( exp ) (__builtin_expect( !!(exp), true ))
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# define MATH_UNLIKELY( exp ) (__builtin_expect( !!(exp), false ))
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# else
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# define MATH_LIKELY( exp ) (__builtin_expect( !!(exp), 1 ))
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# define MATH_UNLIKELY( exp ) (__builtin_expect( !!(exp), 0 ))
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# endif
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#else
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# define MATH_LIKELY( exp ) (exp)
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# define MATH_UNLIKELY( exp ) (exp)
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#endif
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#if __has_attribute(pure)
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# define MATH_PURE __attribute__((pure))
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#else
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# define MATH_PURE
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#endif
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#ifdef _MSC_VER
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# define MATH_EMPTY_BASES __declspec(empty_bases)
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#else
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# define MATH_EMPTY_BASES
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#endif
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