1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
/* Return classification value corresponding to argument.
Copyright (C) 1997, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <math.h>
#include "math_private.h"
int
__fpclassify (double x)
{
u_int32_t hx, lx;
int retval = FP_NORMAL;
EXTRACT_WORDS (hx, lx, x);
lx |= hx & 0xfffff;
hx &= 0x7ff00000;
if ((hx | lx) == 0)
retval = FP_ZERO;
else if (hx == 0)
retval = FP_SUBNORMAL;
else if (hx == 0x7ff00000)
retval = lx != 0 ? FP_NAN : FP_INFINITE;
return retval;
}
libm_hidden_def (__fpclassify)
|
