1 /* Return classification value corresponding to argument.
2    Copyright (C) 1997, 2002 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5 
6    The GNU C Library is free software; you can redistribute it and/or
7    modify it under the terms of the GNU Lesser General Public
8    License as published by the Free Software Foundation; either
9    version 2.1 of the License, or (at your option) any later version.
10 
11    The GNU C Library is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14    Lesser General Public License for more details.
15 
16    You should have received a copy of the GNU Lesser General Public
17    License along with the GNU C Library; if not, see
18    <http://www.gnu.org/licenses/>.  */
19 
20 #include <math.h>
21 
22 #include "math_private.h"
23 
__fpclassify(double x)24 int __fpclassify(double x)
25 {
26   u_int32_t hx, lx;
27   int retval = FP_NORMAL;
28 
29   EXTRACT_WORDS (hx, lx, x);
30   lx |= hx & 0xfffff;
31   hx &= 0x7ff00000;
32   if ((hx | lx) == 0)
33     retval = FP_ZERO;
34   else if (hx == 0)
35     retval = FP_SUBNORMAL;
36   else if (hx == 0x7ff00000)
37     retval = lx != 0 ? FP_NAN : FP_INFINITE;
38 
39   return retval;
40 }
41 libm_hidden_def(__fpclassify)
42