math/w_expf_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
  23 #if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_27)
  24 /* wrapper expf */
  25 float
  26 __expf_compat (float x)
  27 {
  28   float z = __ieee754_expf (x);
  29   if (__builtin_expect (!isfinite (z) || z == 0, 0)
  30       && isfinite (x) && _LIB_VERSION != _IEEE_)
  31     return __kernel_standard_f (x, x, 106 + !!signbit (x));
  32
  33   return z;
  34 }
  35 compat_symbol (libm, __expf_compat, expf, GLIBC_2_0);
  36 #endif