1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19 #include <math.h>
20 #include "math_private.h"
21
22
23 /* wrapper acosh */
24 double
acosh(double x)25 acosh (double x)
26 {
27 #if defined(__UCLIBC_HAS_FENV__)
28 if (__builtin_expect (isless (x, 1.0), 0) && _LIB_VERSION != _IEEE_)
29 /* acosh(x<1) */
30 return __kernel_standard (x, x, 29);
31 #endif
32 return __ieee754_acosh (x);
33 }
34 libm_hidden_def(acosh)
35