math/w_j0_compat.c

   1 /* Copyright (C) 2011-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <fenv.h>
  19 #include <math.h>
  20 #include <math_private.h>
  21 #include <math-svid-compat.h>
  22 #include <libm-alias-double.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 libm_alias_double (__j0, j0)
  38
  39
  40 /* wrapper y0 */
  41 double
  42 __y0 (double x)
  43 {
  44   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
  45       && _LIB_VERSION != _IEEE_)
  46     {
  47       if (x < 0.0)
  48         {
  49           /* d = zero/(x-x) */
  50           __feraiseexcept (FE_INVALID);
  51           return __kernel_standard (x, x, 9);
  52         }
  53       else if (x == 0.0)
  54         {
  55           /* d = -one/(x-x) */
  56           __feraiseexcept (FE_DIVBYZERO);
  57           return __kernel_standard (x, x, 8);
  58         }
  59       else if (_LIB_VERSION != _POSIX_)
  60         /* y0(x>X_TLOSS) */
  61         return __kernel_standard (x, x, 35);
  62     }
  63
  64   return __ieee754_y0 (x);
  65 }
  66 libm_alias_double (__y0, y0)
  67 #endif