sysdeps/ieee754/flt-32/w_expf.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 <math.h>
  20 #include <math_private.h>
  21
  22 static const float
  23 o_threshold=  8.8722831726e+01,  /* 0x42b17217 */
  24 u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
  25
  26
  27 /* wrapper expf */
  28 float
  29 __expf (float x)
  30 {
  31   if (__builtin_expect (isgreater (x, o_threshold), 0))
  32     {
  33       if (_LIB_VERSION != _IEEE_)
  34         return __kernel_standard_f (x, x, 106);
  35     }
  36   else if (__builtin_expect (isless (x, u_threshold), 0))
  37     {
  38       if (_LIB_VERSION != _IEEE_)
  39         return __kernel_standard_f (x, x, 107);
  40     }
  41
  42   return __ieee754_expf (x);
  43 }
  44 hidden_def (__expf)
  45 weak_alias (__expf, expf)