math/w_atanh_compat.c

   1 /* Copyright (C) 2011-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <math.h>
  19 #include <math_private.h>
  20 #include <math-svid-compat.h>
  21 #include <libm-alias-double.h>
  22
  23
  24 #if LIBM_SVID_COMPAT
  25 /* wrapper atanh */
  26 double
  27 __atanh (double x)
  28 {
  29   if (__builtin_expect (isgreaterequal (fabs (x), 1.0), 0)
  30       && _LIB_VERSION != _IEEE_)
  31     return __kernel_standard (x, x,
  32                               fabs (x) > 1.0
  33                               ? 30              /* atanh(|x|>1) */
  34                               : 31);            /* atanh(|x|==1) */
  35
  36   return __ieee754_atanh (x);
  37 }
  38 libm_alias_double (__atanh, atanh)
  39 #endif