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 acosh */
      26  double
      27  __acosh (double x)
      28  {
      29    if (__builtin_expect (isless (x,  1.0), 0) && _LIB_VERSION != _IEEE_)
      30      /* acosh(x<1) */
      31      return __kernel_standard (x, x, 29);
      32  
      33    return __ieee754_acosh (x);
      34  }
      35  libm_alias_double (__acosh, acosh)
      36  #endif