87 lines
2.0 KiB
C
87 lines
2.0 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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#if defined (WIN32)
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#ifdef max
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#undef max
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#endif
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#ifdef min
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#undef min
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#endif
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#ifdef far
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#undef far
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#endif
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#ifdef near
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#undef near
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#endif
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#endif
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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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// MSVC does not support loop unrolling hints
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# define MATH_NOUNROLL
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// Sadly, MSVC does not support __builtin_constant_p
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# ifndef MAKE_CONSTEXPR
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# define MAKE_CONSTEXPR(e) (e)
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# endif
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#else // _MSC_VER
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# define MATH_EMPTY_BASES
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// C++11 allows pragmas to be specified as part of defines using the _Pragma syntax.
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# define MATH_NOUNROLL _Pragma("nounroll")
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# ifndef MAKE_CONSTEXPR
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# define MAKE_CONSTEXPR(e) __builtin_constant_p(e) ? (e) : (e)
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# endif
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#endif // _MSC_VER
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