math/w_jnf.c

   1 /* Copyright (C) 2011-2015 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 <fenv.h>
  20 #include <math.h>
  21 #include <math_private.h>
  22
  23
  24 /* wrapper jnf */
  25 float
  26 jnf (int n, float x)
  27 {
  28   if (__builtin_expect (isgreater (fabsf (x), (float) X_TLOSS), 0)
  29       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
  30     /* jn(n,|x|>X_TLOSS) */
  31     return __kernel_standard_f (n, x, 138);
  32
  33   return __ieee754_jnf (n, x);
  34 }
  35
  36
  37 /* wrapper ynf */
  38 float
  39 ynf (int n, float x)
  40 {
  41   if (__builtin_expect (islessequal (x, 0.0f)
  42                         || isgreater (x, (float) X_TLOSS), 0)
  43       && _LIB_VERSION != _IEEE_)
  44     {
  45       if (x < 0.0f)
  46         {
  47           /* d = zero/(x-x) */
  48           feraiseexcept (FE_INVALID);
  49           return __kernel_standard_f (n, x, 113);
  50         }
  51       else if (x == 0.0)
  52         {
  53           /* d = -one/(x-x) */
  54           feraiseexcept (FE_DIVBYZERO);
  55           return __kernel_standard_f (n, x, 112);
  56         }
  57       else if (_LIB_VERSION != _POSIX_)
  58         /* yn(n,x>X_TLOSS) */
  59         return __kernel_standard_f (n, x, 139);
  60     }
  61
  62   return __ieee754_ynf (n, x);
  63 }