math/e_exp10l.c

   1 /* Copyright (C) 1998-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include <math_private.h>
  21 #include <float.h>
  22 #include <libm-alias-finite.h>
  23
  24 long double
  25 __ieee754_exp10l (long double arg)
  26 {
  27   if (isfinite (arg) && arg < LDBL_MIN_10_EXP - LDBL_DIG - 10)
  28     return LDBL_MIN * LDBL_MIN;
  29   else
  30     /* This is a very stupid and inprecise implementation.  It'll get
  31        replaced sometime (soon?).  */
  32     return __ieee754_expl (M_LN10l * arg);
  33 }
  34 libm_alias_finite (__ieee754_exp10, __exp10)