libm/w_j1.c

   1 /* Copyright (C) 2011-2016 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 <math.h>
  20 #include "math_private.h"
  21 #if __UCLIBC_HAS_FENV__
  22 #include <fenv.h>
  23 #endif
  24
  25 /* wrapper j1 */
  26 double
  27 j1 (double x)
  28 {
  29 #if __UCLIBC_HAS_FENV__
  30   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
  31       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  32     /* j1(|x|>X_TLOSS) */
  33     return __kernel_standard (x, x, 36);
  34 #endif /* __UCLIBC_HAS_FENV__ */
  35   return __ieee754_j1 (x);
  36 }
  37
  38 /* wrapper y1 */
  39 double
  40 y1 (double x)
  41 {
  42 #if __UCLIBC_HAS_FENV__
  43   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
  44       && _LIB_VERSION != _IEEE_)
  45     {
  46       if (x < 0.0)
  47         {
  48           /* d = zero/(x-x) */
  49           feraiseexcept (FE_INVALID);
  50           return __kernel_standard (x, x, 11);
  51         }
  52       else if (x == 0.0)
  53         {
  54           /* d = -one/(x-x) */
  55           feraiseexcept (FE_DIVBYZERO);
  56           return __kernel_standard (x, x, 10);
  57         }
  58       else if (_LIB_VERSION != _POSIX_)
  59         /* y1(x>X_TLOSS) */
  60         return __kernel_standard (x, x, 37);
  61     }
  62 #endif /* __UCLIBC_HAS_FENV__ */
  63   return __ieee754_y1 (x);
  64 }