1/* Copyright (C) 2011-2020 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 <https://www.gnu.org/licenses/>. */
18
19#include <math.h>
20#include <math_private.h>
21#include <math-svid-compat.h>
22#include <libm-alias-double.h>
23
24
25#if LIBM_SVID_COMPAT
26/* wrapper atanh */
27double
28__atanh (double x)
29{
30 if (__builtin_expect (isgreaterequal (fabs (x), 1.0), 0)
31 && _LIB_VERSION != _IEEE_)
32 return __kernel_standard (x, x,
33 fabs (x) > 1.0
34 ? 30 /* atanh(|x|>1) */
35 : 31); /* atanh(|x|==1) */
36
37 return __ieee754_atanh (x);
38}
39libm_alias_double (__atanh, atanh)
40#endif
41