34 lines
681 B
C
34 lines
681 B
C
|
|
/* @(#)z_isinff.c 1.0 98/08/13 */
|
|
/******************************************************************
|
|
* isinff
|
|
*
|
|
* Input:
|
|
* x - pointer to a floating point value
|
|
*
|
|
* Output:
|
|
* An integer that indicates if the number is infinite.
|
|
*
|
|
* Description:
|
|
* This routine returns an integer that indicates if the number
|
|
* passed in is infinite (1) or is finite (0).
|
|
*
|
|
*****************************************************************/
|
|
|
|
#include "fdlibm.h"
|
|
#include "zmath.h"
|
|
|
|
int isinff (float x)
|
|
{
|
|
__uint32_t wx;
|
|
int exp;
|
|
|
|
GET_FLOAT_WORD (wx, x);
|
|
exp = (wx & 0x7f800000) >> 23;
|
|
|
|
if ((exp == 0x7f8) && !(wx & 0xf0000))
|
|
return (1);
|
|
else
|
|
return (0);
|
|
}
|