math/w_acos.c

   1 /* Copyright (C) 2011, 2012 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 <fenv.h>
  20 #include <math.h>
  21 #include <math_private.h>
  22
  23
  24 /* wrapper acos */
  25 double
  26 __acos (double x)
  27 {
  28   if (__builtin_expect (isgreater (fabs (x), 1.0), 0)
  29       && _LIB_VERSION != _IEEE_)
  30     {
  31       /* acos(|x|>1) */
  32       feraiseexcept (FE_INVALID);
  33       return __kernel_standard (x, x, 1);
  34     }
  35
  36   return __ieee754_acos (x);
  37 }
  38 weak_alias (__acos, acos)
  39 #ifdef NO_LONG_DOUBLE
  40 strong_alias (__acos, __acosl)
  41 weak_alias (__acos, acosl)
  42 #endif