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_GAMMA_H
10#define _LIBCPP___MATH_GAMMA_H
11
12#include <__config>
13#include <__type_traits/enable_if.h>
14#include <__type_traits/is_integral.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17#  pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22namespace __math {
23
24// lgamma
25
26inline _LIBCPP_HIDE_FROM_ABI float lgamma(float __x) _NOEXCEPT { return __builtin_lgammaf(__x); }
27
28template <class = int>
29_LIBCPP_HIDE_FROM_ABI double lgamma(double __x) _NOEXCEPT {
30  return __builtin_lgamma(__x);
31}
32
33inline _LIBCPP_HIDE_FROM_ABI long double lgamma(long double __x) _NOEXCEPT { return __builtin_lgammal(__x); }
34
35template <class _A1, __enable_if_t<is_integral<_A1>::value, int> = 0>
36inline _LIBCPP_HIDE_FROM_ABI double lgamma(_A1 __x) _NOEXCEPT {
37  return __builtin_lgamma((double)__x);
38}
39
40// nan
41
42// tgamma
43
44inline _LIBCPP_HIDE_FROM_ABI float tgamma(float __x) _NOEXCEPT { return __builtin_tgammaf(__x); }
45
46template <class = int>
47_LIBCPP_HIDE_FROM_ABI double tgamma(double __x) _NOEXCEPT {
48  return __builtin_tgamma(__x);
49}
50
51inline _LIBCPP_HIDE_FROM_ABI long double tgamma(long double __x) _NOEXCEPT { return __builtin_tgammal(__x); }
52
53template <class _A1, __enable_if_t<is_integral<_A1>::value, int> = 0>
54inline _LIBCPP_HIDE_FROM_ABI double tgamma(_A1 __x) _NOEXCEPT {
55  return __builtin_tgamma((double)__x);
56}
57
58} // namespace __math
59
60_LIBCPP_END_NAMESPACE_STD
61
62#endif // _LIBCPP___MATH_GAMMA_H