math/w_jn_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 <fenv.h>
  20 #include <math.h>
  21 #include <math_private.h>
  22 #include <math-svid-compat.h>
  23 #include <libm-alias-double.h>
  24
  25
  26 #if LIBM_SVID_COMPAT
  27 /* wrapper jn */
  28 double
  29 __jn (int n, double x)
  30 {
  31   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
  32       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  33     /* jn(n,|x|>X_TLOSS) */
  34     return __kernel_standard (n, x, 38);
  35
  36   return __ieee754_jn (n, x);
  37 }
  38 libm_alias_double (__jn, jn)
  39
  40
  41 /* wrapper yn */
  42 double
  43 __yn (int n, double x)
  44 {
  45   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
  46       && _LIB_VERSION != _IEEE_)
  47     {
  48       if (x < 0.0)
  49         {
  50           /* d = zero/(x-x) */
  51           __feraiseexcept (FE_INVALID);
  52           return __kernel_standard (n, x, 13);
  53         }
  54       else if (x == 0.0)
  55         {
  56           /* d = -one/(x-x) */
  57           __feraiseexcept (FE_DIVBYZERO);
  58           return __kernel_standard (n, x, 12);
  59         }
  60       else if (_LIB_VERSION != _POSIX_)
  61         /* yn(n,x>X_TLOSS) */
  62         return __kernel_standard (n, x, 39);
  63     }
  64
  65   return __ieee754_yn (n, x);
  66 }
  67 libm_alias_double (__yn, yn)
  68 #endif