sysdeps/ieee754/ldbl-128/s_fpclassifyl.c

   1 /* Return classification value corresponding to argument.
   2    Copyright (C) 1997, 1999, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
   5                   Jakub Jelinek <jj@ultra.linux.cz>, 1999.
   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, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <math.h>
  23
  24 #include "math_private.h"
  25
  26
  27 int
  28 __fpclassifyl (long double x)
  29 {
  30   u_int64_t hx, lx;
  31   int retval = FP_NORMAL;
  32
  33   GET_LDOUBLE_WORDS64 (hx, lx, x);
  34   lx |= (hx & 0x0000ffffffffffffLL);
  35   hx &= 0x7fff000000000000LL;
  36   if ((hx | lx) == 0)
  37     retval = FP_ZERO;
  38   else if (hx == 0)
  39     retval = FP_SUBNORMAL;
  40   else if (hx == 0x7fff000000000000LL)
  41     retval = lx != 0 ? FP_NAN : FP_INFINITE;
  42
  43   return retval;
  44 }
  45 libm_hidden_def (__fpclassifyl)