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_FMA_H
10 #define _LIBCPP___MATH_FMA_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
fma(float __x,float __y,float __z)26 inline _LIBCPP_HIDE_FROM_ABI float fma(float __x, float __y, float __z) _NOEXCEPT {
27 return __builtin_fmaf(__x, __y, __z);
28 }
29
30 template <class = int>
fma(double __x,double __y,double __z)31 _LIBCPP_HIDE_FROM_ABI double fma(double __x, double __y, double __z) _NOEXCEPT {
32 return __builtin_fma(__x, __y, __z);
33 }
34
fma(long double __x,long double __y,long double __z)35 inline _LIBCPP_HIDE_FROM_ABI long double fma(long double __x, long double __y, long double __z) _NOEXCEPT {
36 return __builtin_fmal(__x, __y, __z);
37 }
38
39 template <class _A1,
40 class _A2,
41 class _A3,
42 __enable_if_t<is_arithmetic<_A1>::value && is_arithmetic<_A2>::value && is_arithmetic<_A3>::value, int> = 0>
fma(_A1 __x,_A2 __y,_A3 __z)43 inline _LIBCPP_HIDE_FROM_ABI typename __promote<_A1, _A2, _A3>::type fma(_A1 __x, _A2 __y, _A3 __z) _NOEXCEPT {
44 using __result_type = typename __promote<_A1, _A2, _A3>::type;
45 static_assert(
46 !(_IsSame<_A1, __result_type>::value && _IsSame<_A2, __result_type>::value && _IsSame<_A3, __result_type>::value),
47 "");
48 return __builtin_fma((__result_type)__x, (__result_type)__y, (__result_type)__z);
49 }
50
51 } // namespace __math
52
53 _LIBCPP_END_NAMESPACE_STD
54
55 #endif // _LIBCPP___MATH_FMA_H
56