libm/w_j0.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 /* wrapper j0 */
  25 double
  26 j0 (double x)
  27 {
  28 #if __UCLIBC_HAS_FENV__
  29   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
  30       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  31     /* j0(|x|>X_TLOSS) */
  32     return __kernel_standard (x, x, 34);
  33 #endif /* __UCLIBC_HAS_FENV__ */
  34   return __ieee754_j0 (x);
  35 }
  36
  37 /* wrapper y0 */
  38 double
  39 y0 (double x)
  40 {
  41 #if __UCLIBC_HAS_FENV__
  42   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
  43       && _LIB_VERSION != _IEEE_)
  44     {
  45       if (x < 0.0)
  46         {
  47           /* d = zero/(x-x) */
  48           feraiseexcept (FE_INVALID);
  49           return __kernel_standard (x, x, 9);
  50         }
  51       else if (x == 0.0)
  52         {
  53           /* d = -one/(x-x) */
  54           feraiseexcept (FE_DIVBYZERO);
  55           return __kernel_standard (x, x, 8);
  56         }
  57       else if (_LIB_VERSION != _POSIX_)
  58         /* y0(x>X_TLOSS) */
  59         return __kernel_standard (x, x, 35);
  60     }
  61 #endif /* __UCLIBC_HAS_FENV__ */
  62   return __ieee754_y0 (x);
  63 }