math/w_logl_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 #include <fenv.h>
  20 #include <math.h>
  21 #include <math_private.h>
  22 #include <fenv_private.h>
  23 #include <math-svid-compat.h>
  24 #include <libm-alias-ldouble.h>
  25
  26
  27 #if LIBM_SVID_COMPAT
  28 /* wrapper logl(x) */
  29 long double
  30 __logl (long double x)
  31 {
  32   if (__builtin_expect (islessequal (x, 0.0L), 0) && _LIB_VERSION != _IEEE_)
  33     {
  34       if (x == 0.0L)
  35         {
  36           feraiseexcept (FE_DIVBYZERO);
  37           return __kernel_standard_l (x, x, 216); /* log(0) */
  38         }
  39       else
  40         {
  41           feraiseexcept (FE_INVALID);
  42           return __kernel_standard_l (x, x, 217); /* log(x<0) */
  43         }
  44     }
  45
  46   return  __ieee754_logl (x);
  47 }
  48 libm_alias_ldouble (__log, log)
  49 #endif