72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
|
/*
|
||
|
|
* Copyright 2016-present Facebook, Inc.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <cmath>
|
||
|
|
|
||
|
|
namespace folly {
|
||
|
|
|
||
|
|
#ifndef __ANDROID__
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Most platforms hopefully provide std::nextafter.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* using override */ using std::nextafter;
|
||
|
|
|
||
|
|
#else // !__ANDROID__
|
||
|
|
|
||
|
|
/**
|
||
|
|
* On Android, std::nextafter isn't implemented. However, the C functions and
|
||
|
|
* compiler builtins are still provided. Using the GCC builtin is actually
|
||
|
|
* slightly faster, as they're constexpr and the use cases within folly are in
|
||
|
|
* constexpr context.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if defined(__GNUC__) && !defined(__clang__)
|
||
|
|
|
||
|
|
constexpr float nextafter(float x, float y) {
|
||
|
|
return __builtin_nextafterf(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr double nextafter(double x, double y) {
|
||
|
|
return __builtin_nextafter(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr long double nextafter(long double x, long double y) {
|
||
|
|
return __builtin_nextafterl(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
#else // __GNUC__
|
||
|
|
|
||
|
|
inline float nextafter(float x, float y) {
|
||
|
|
return ::nextafterf(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline double nextafter(double x, double y) {
|
||
|
|
return ::nextafter(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline long double nextafter(long double x, long double y) {
|
||
|
|
return ::nextafterl(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // __GNUC__
|
||
|
|
|
||
|
|
#endif // __ANDROID__
|
||
|
|
} // namespace folly
|