xref: /freebsd/contrib/llvm-project/libcxx/include/__math/fdim.h (revision 56b17de1e8360fe131d425de20b5e75ff3ea897c)
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 
24 namespace __math {
25 
26 inline _LIBCPP_HIDE_FROM_ABI float fdim(float __x, float __y) _NOEXCEPT { return __builtin_fdimf(__x, __y); }
27 
28 template <class = int>
29 _LIBCPP_HIDE_FROM_ABI double fdim(double __x, double __y) _NOEXCEPT {
30   return __builtin_fdim(__x, __y);
31 }
32 
33 inline _LIBCPP_HIDE_FROM_ABI long double fdim(long double __x, long double __y) _NOEXCEPT {
34   return __builtin_fdiml(__x, __y);
35 }
36 
37 template <class _A1, class _A2, __enable_if_t<is_arithmetic<_A1>::value && is_arithmetic<_A2>::value, int> = 0>
38 inline _LIBCPP_HIDE_FROM_ABI typename __promote<_A1, _A2>::type fdim(_A1 __x, _A2 __y) _NOEXCEPT {
39   using __result_type = typename __promote<_A1, _A2>::type;
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