sysdeps/ieee754/ldbl-96/s_fpclassifyl.c

   1 /* Return classification value corresponding to argument.
   2    Copyright (C) 1997-2013 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5    Fixed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <math.h>
  22
  23 #include <math_private.h>
  24
  25
  26 int
  27 __fpclassifyl (long double x)
  28 {
  29   u_int32_t ex, hx, lx, m;
  30   int retval = FP_NORMAL;
  31
  32   GET_LDOUBLE_WORDS (ex, hx, lx, x);
  33   m = (hx & 0x7fffffff) | lx;
  34   ex &= 0x7fff;
  35   if ((ex | m) == 0)
  36     retval = FP_ZERO;
  37   else if (ex == 0 && (hx & 0x80000000) == 0)
  38     retval = FP_SUBNORMAL;
  39   else if (ex == 0x7fff)
  40     retval = m != 0 ? FP_NAN : FP_INFINITE;
  41
  42   return retval;
  43 }
  44 libm_hidden_def (__fpclassifyl)