libm/w_acosf.c

   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 #if defined(__UCLIBC_HAS_FENV__)
  22 #include <fenv.h>
  23 #endif
  24 /* wrapper acosf */
  25 float
  26 acosf (float x)
  27 {
  28 #if defined(__UCLIBC_HAS_FENV__)
  29   if (__builtin_expect (isgreater (fabsf (x), 1.0f), 0)
  30       && _LIB_VERSION != _IEEE_)
  31     {
  32       /* acos(|x|>1) */
  33       feraiseexcept (FE_INVALID);
  34       return __kernel_standard_f (x, x, 101);
  35     }
  36 #endif
  37   return (float) __ieee754_acos ((float) x);
  38 }