math/w_jn.c

   1 /* Copyright (C) 2011 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <fenv.h>
  21 #include <math.h>
  22 #include <math_private.h>
  23
  24
  25 /* wrapper jn */
  26 double
  27 jn (int n, double x)
  28 {
  29   if (__builtin_expect (fabs (x) > X_TLOSS, 0) && _LIB_VERSION != _IEEE_)
  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 (x <= 0.0 || x > X_TLOSS, 0) && _LIB_VERSION != _IEEE_)
  45     {
  46       if (x < 0.0)
  47         {
  48           /* d = zero/(x-x) */
  49           feraiseexcept (FE_INVALID);
  50           return __kernel_standard (n, x, 13);
  51         }
  52       else if (x == 0.0)
  53         /* d = -one/(x-x) */
  54         return __kernel_standard (n, x, 12);
  55       else
  56         /* yn(n,x>X_TLOSS) */
  57         return __kernel_standard (n, x, 39);
  58     }
  59
  60   return __ieee754_yn (n, x);
  61 }
  62 #ifdef NO_LONG_DOUBLE
  63 strong_alias (yn, ynl)
  64 #endif