math/e_exp10.c

   1 /* Copyright (C) 1998-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <math.h>
  19 #include <math_private.h>
  20 #include <float.h>
  21 #include <libm-alias-finite.h>
  22
  23 double
  24 __ieee754_exp10 (double arg)
  25 {
  26   if (isfinite (arg) && arg < DBL_MIN_10_EXP - DBL_DIG - 10)
  27     return DBL_MIN * DBL_MIN;
  28   else
  29     /* This is a very stupid and inprecise implementation.  It'll get
  30        replaced sometime (soon?).  */
  31     return __ieee754_exp (M_LN10 * arg);
  32 }
  33 libm_alias_finite (__ieee754_exp10, __exp10)