blob: ac557a6b8a7131e792c20487b47795842b048fa7 (
plain)
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
44
45
46
47
48
|
/* @(#)z_isnanf.c 1.0 98/08/13 */
/******************************************************************
* isnanf
*
* Input:
* x - pointer to a floating point value
*
* Output:
* An integer that indicates if the number is NaN.
*
* Description:
* This routine returns an integer that indicates if the number
* passed in is NaN (1) or is finite (0).
*
*****************************************************************/
#include "fdlibm.h"
#include "zmath.h"
int
_DEFUN (isnanf, (float),
float x)
{
__int32_t wx;
int exp;
GET_FLOAT_WORD (wx, x);
exp = (wx & 0x7f800000) >> 23;
if ((exp == 0x7f8) && (wx & 0x7fffff))
return (1);
else
return (0);
}
#ifdef _DOUBLE_IS_32BITS
int
_DEFUN (isnan, (double),
double x)
{
return isnanf((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */
|
