v1/__math/fdim.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___MATH_FDIM_H
0010 #define _LIBCPP___MATH_FDIM_H
0011
0012 #include <__config>
0013 #include <__type_traits/enable_if.h>
0014 #include <__type_traits/is_arithmetic.h>
0015 #include <__type_traits/is_same.h>
0016 #include <__type_traits/promote.h>
0017
0018 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0019 #  pragma GCC system_header
0020 #endif
0021
0022 _LIBCPP_BEGIN_NAMESPACE_STD
0023
0024 namespace __math {
0025
0026 inline _LIBCPP_HIDE_FROM_ABI float fdim(float __x, float __y) _NOEXCEPT { return __builtin_fdimf(__x, __y); }
0027
0028 template <class = int>
0029 _LIBCPP_HIDE_FROM_ABI double fdim(double __x, double __y) _NOEXCEPT {
0030   return __builtin_fdim(__x, __y);
0031 }
0032
0033 inline _LIBCPP_HIDE_FROM_ABI long double fdim(long double __x, long double __y) _NOEXCEPT {
0034   return __builtin_fdiml(__x, __y);
0035 }
0036
0037 template <class _A1, class _A2, __enable_if_t<is_arithmetic<_A1>::value && is_arithmetic<_A2>::value, int> = 0>
0038 inline _LIBCPP_HIDE_FROM_ABI typename __promote<_A1, _A2>::type fdim(_A1 __x, _A2 __y) _NOEXCEPT {
0039   using __result_type = typename __promote<_A1, _A2>::type;
0040   static_assert(!(_IsSame<_A1, __result_type>::value && _IsSame<_A2, __result_type>::value), "");
0041   return __math::fdim((__result_type)__x, (__result_type)__y);
0042 }
0043
0044 } // namespace __math
0045
0046 _LIBCPP_END_NAMESPACE_STD
0047
0048 #endif // _LIBCPP___MATH_FDIM_H