math/w_exp10_compat.c

   1 /* Copyright (C) 2011-2018 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 #include <math-svid-compat.h>
  27 #include <libm-alias-double.h>
  28
  29 #if LIBM_SVID_COMPAT
  30 double
  31 __exp10 (double x)
  32 {
  33   double z = __ieee754_exp10 (x);
  34   if (__builtin_expect (!isfinite (z) || z == 0, 0)
  35       && isfinite (x) && _LIB_VERSION != _IEEE_)
  36     /* exp10 overflow (46) if x > 0, underflow (47) if x < 0.  */
  37     return __kernel_standard (x, x, 46 + !!signbit (x));
  38
  39   return z;
  40 }
  41 libm_alias_double (__exp10, exp10)
  42 # if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_27)
  43 strong_alias (__exp10, __pow10)
  44 compat_symbol (libm, __pow10, pow10, GLIBC_2_1);
  45 # endif
  46 # ifdef NO_LONG_DOUBLE
  47 #  if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_27)
  48 strong_alias (__exp10l, __pow10l)
  49 compat_symbol (libm, __pow10l, pow10l, GLIBC_2_1);
  50 #  endif
  51 # endif
  52 #endif