libm/w_j0f.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 #ifndef __DO_XSI_MATH__
  26 /* wrapper j0f */
  27 float
  28 j0f (float x)
  29 {
  30 # if __UCLIBC_HAS_FENV__
  31   if (__builtin_expect (isgreater (fabsf (x), (float) X_TLOSS), 0)
  32       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  33     /* j0(|x|>X_TLOSS) */
  34     return __kernel_standard_f (x, x, 134);
  35 # endif /* __UCLIBC_HAS_FENV__ */
  36   return (float) __ieee754_j0 ((double) x);
  37 }
  38
  39
  40 /* wrapper y0f */
  41 float
  42 y0f (float x)
  43 {
  44 # if __UCLIBC_HAS_FENV__
  45   if (__builtin_expect (islessequal (x, 0.0f)
  46                         || isgreater (x, (float) X_TLOSS), 0)
  47       && _LIB_VERSION != _IEEE_)
  48     {
  49       if (x < 0.0f)
  50         {
  51           /* d = zero/(x-x) */
  52           feraiseexcept (FE_INVALID);
  53           return __kernel_standard_f (x, x, 109);
  54         }
  55       else if (x == 0.0f)
  56         {
  57           /* d = -one/(x-x) */
  58           feraiseexcept (FE_DIVBYZERO);
  59           return __kernel_standard_f (x, x, 108);
  60         }
  61       else if (_LIB_VERSION != _POSIX_)
  62         /* y0(x>X_TLOSS) */
  63         return __kernel_standard_f (x, x, 135);
  64     }
  65 # endif /* __UCLIBC_HAS_FENV__ */
  66   return (float) __ieee754_y0f ((double) x);
  67 }
  68 #endif /* __DO_XSI_MATH__ */