libm/w_exp10l.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 exp10l(x)
  22  */
  23
  24 #include <math.h>
  25 #include "math_private.h"
  26
  27 #if !defined __NO_LONG_DOUBLE_MATH
  28 long double
  29 exp10l (long double x)
  30 {
  31 # if defined(__UCLIBC_HAS_FENV__)
  32   long double z = (long double) __ieee754_exp10 ((double) x);
  33   if (__builtin_expect (!isfinite (z) || z == 0, 0)
  34       && isfinite (x) && _LIB_VERSION != _IEEE_)
  35     /* exp10l overflow (246) if x > 0, underflow (247) if x < 0.  */
  36     return __kernel_standard_l (x, x, 246 + !!signbit (x));
  37
  38   return z;
  39 # else
  40   return (long double) __ieee754_exp10 ((double) x);
  41 # endif /* __UCLIBC_HAS_FENV__ */
  42 }
  43 strong_alias (exp10l, pow10l)
  44 #endif /* __NO_LONG_DOUBLE_MATH */