math/w_jn.c

   1 /* Copyright (C) 2011-2013 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
  23
  24 /* wrapper jn */
  25 double
  26 jn (int n, double x)
  27 {
  28   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
  29       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  30     /* jn(n,|x|>X_TLOSS) */
  31     return __kernel_standard (n, x, 38);
  32
  33   return __ieee754_jn (n, x);
  34 }
  35 #ifdef NO_LONG_DOUBLE
  36 strong_alias (jn, jnl)
  37 #endif
  38
  39
  40 /* wrapper yn */
  41 double
  42 yn (int n, 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 (n, x, 13);
  52         }
  53       else if (x == 0.0)
  54         /* d = -one/(x-x) */
  55         return __kernel_standard (n, x, 12);
  56       else if (_LIB_VERSION != _POSIX_)
  57         /* yn(n,x>X_TLOSS) */
  58         return __kernel_standard (n, x, 39);
  59     }
  60
  61   return __ieee754_yn (n, x);
  62 }
  63 #ifdef NO_LONG_DOUBLE
  64 strong_alias (yn, ynl)
  65 #endif