libm/w_jnf.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 defined(__UCLIBC_HAS_FENV__)
  22 #include <fenv.h>
  23 #endif
  24
  25 /* wrapper jnf */
  26 float
  27 jnf (int n, float x)
  28 {
  29 #if defined(__UCLIBC_HAS_FENV__)
  30   if (__builtin_expect (isgreater (fabsf (x), (float) X_TLOSS), 0)
  31       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  32     /* jn(n,|x|>X_TLOSS) */
  33     return __kernel_standard_f (n, x, 138);
  34 #endif
  35   return (float) __ieee754_jn (n, (double) x);
  36 }
  37
  38
  39 /* wrapper ynf */
  40 float
  41 ynf (int n, float x)
  42 {
  43 #if defined(__UCLIBC_HAS_FENV__)
  44   if (__builtin_expect (islessequal (x, 0.0f)
  45                         || isgreater (x, (float) X_TLOSS), 0)
  46       && _LIB_VERSION != _IEEE_)
  47     {
  48       if (x < 0.0f)
  49         {
  50           /* d = zero/(x-x) */
  51           feraiseexcept (FE_INVALID);
  52           return __kernel_standard_f (n, x, 113);
  53         }
  54       else if (x == 0.0)
  55         {
  56           /* d = -one/(x-x) */
  57           feraiseexcept (FE_DIVBYZERO);
  58           return __kernel_standard_f (n, x, 112);
  59         }
  60       else if (_LIB_VERSION != _POSIX_)
  61         /* yn(n,x>X_TLOSS) */
  62         return __kernel_standard_f (n, x, 139);
  63     }
  64 #endif /* __UCLIBC_HAS_FENV__ */
  65   return (float) __ieee754_yn (n, (double) x);
  66 }