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 
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>
31 _LIBCPP_HIDE_FROM_ABI double fma(double __x, double __y, double __z) _NOEXCEPT {
32   return __builtin_fma(__x, __y, __z);
33 }
34 
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>
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((!(_IsSame<_A1, __result_type>::value && _IsSame<_A2, __result_type>::value &&
46                    _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