1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___MATH_FDIM_H
10#define _LIBCPP___MATH_FDIM_H
11
12#include <__config>
13#include <__type_traits/enable_if.h>
14#include <__type_traits/is_arithmetic.h>
15#include <__type_traits/is_same.h>
16#include <__type_traits/promote.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19# pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23
24namespace __math {
25
26inline _LIBCPP_HIDE_FROM_ABI float fdim(float __x, float __y) _NOEXCEPT { return __builtin_fdimf(__x, __y); }
27
28template <class = int>
29_LIBCPP_HIDE_FROM_ABI double fdim(double __x, double __y) _NOEXCEPT {
30 return __builtin_fdim(__x, __y);
31}
32
33inline _LIBCPP_HIDE_FROM_ABI long double fdim(long double __x, long double __y) _NOEXCEPT {
34 return __builtin_fdiml(__x, __y);
35}
36
37template <class _A1, class _A2, __enable_if_t<is_arithmetic<_A1>::value && is_arithmetic<_A2>::value, int> = 0>
38inline _LIBCPP_HIDE_FROM_ABI __promote_t<_A1, _A2> fdim(_A1 __x, _A2 __y) _NOEXCEPT {
39 using __result_type = __promote_t<_A1, _A2>;
40 static_assert(!(_IsSame<_A1, __result_type>::value && _IsSame<_A2, __result_type>::value), "");
41 return __math::fdim((__result_type)__x, (__result_type)__y);
42}
43
44} // namespace __math
45
46_LIBCPP_END_NAMESPACE_STD
47
48#endif // _LIBCPP___MATH_FDIM_H
49