49 lines
844 B
C
49 lines
844 B
C
|
|
/* @(#)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) */
|
|
|