math/w_exp_compat.c

   1 /* Copyright (C) 2011-2021 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include <math_private.h>
  21 #include <math-svid-compat.h>
  22 #include <libm-alias-double.h>
  23
  24 #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29) \
  25                          || defined NO_LONG_DOUBLE \
  26                          || defined LONG_DOUBLE_COMPAT)
  27 /* wrapper exp */
  28 double
  29 __exp_compat (double x)
  30 {
  31   double z = __ieee754_exp (x);
  32   if (__builtin_expect (!isfinite (z) || z == 0, 0)
  33       && isfinite (x) && _LIB_VERSION != _IEEE_)
  34     return __kernel_standard (x, x, 6 + !!signbit (x));
  35
  36   return z;
  37 }
  38 # if SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29)
  39 compat_symbol (libm, __exp_compat, exp, GLIBC_2_0);
  40 # endif
  41 # ifdef NO_LONG_DOUBLE
  42 weak_alias (__exp_compat, expl)
  43 # endif
  44 # ifdef LONG_DOUBLE_COMPAT
  45 /* Work around gas bug "multiple versions for symbol".  */
  46 weak_alias (__exp_compat, __exp_compat_alias)
  47
  48 LONG_DOUBLE_COMPAT_CHOOSE_libm_expl (
  49   compat_symbol (libm, __exp_compat_alias, expl, FIRST_VERSION_libm_expl), );
  50 # endif
  51 #endif