math/w_j0_compat.c

   1 /* Copyright (C) 2011-2017 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 <math-svid-compat.h>
  23
  24
  25 #if LIBM_SVID_COMPAT
  26 /* wrapper j0 */
  27 double
  28 j0 (double x)
  29 {
  30   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
  31       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  32     /* j0(|x|>X_TLOSS) */
  33     return __kernel_standard (x, x, 34);
  34
  35   return __ieee754_j0 (x);
  36 }
  37 # ifdef NO_LONG_DOUBLE
  38 weak_alias (j0, j0l)
  39 # endif
  40
  41
  42 /* wrapper y0 */
  43 double
  44 y0 (double x)
  45 {
  46   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
  47       && _LIB_VERSION != _IEEE_)
  48     {
  49       if (x < 0.0)
  50         {
  51           /* d = zero/(x-x) */
  52           __feraiseexcept (FE_INVALID);
  53           return __kernel_standard (x, x, 9);
  54         }
  55       else if (x == 0.0)
  56         {
  57           /* d = -one/(x-x) */
  58           __feraiseexcept (FE_DIVBYZERO);
  59           return __kernel_standard (x, x, 8);
  60         }
  61       else if (_LIB_VERSION != _POSIX_)
  62         /* y0(x>X_TLOSS) */
  63         return __kernel_standard (x, x, 35);
  64     }
  65
  66   return __ieee754_y0 (x);
  67 }
  68 # ifdef NO_LONG_DOUBLE
  69 weak_alias (y0, y0l)
  70 # endif
  71 #endif