libm/w_exp10.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
  20 /*
  21  * wrapper exp10(x)
  22  */
  23
  24 #include <math.h>
  25 #include "math_private.h"
  26
  27 double
  28 exp10 (double x)
  29 {
  30 #if defined(__UCLIBC_HAS_FENV__)
  31   double z = __ieee754_exp10 (x);
  32   if (__builtin_expect (!isfinite (z) || z == 0, 0)
  33       && isfinite (x) && _LIB_VERSION != _IEEE_)
  34     /* exp10 overflow (46) if x > 0, underflow (47) if x < 0.  */
  35     return __kernel_standard (x, x, 46 + !!signbit (x));
  36
  37   return z;
  38 #else
  39   return __ieee754_exp10 (x);
  40 #endif
  41 }
  42 libm_hidden_def(exp10)
  43 strong_alias (exp10, pow10)