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/* @(#)z_numtestf.c 1.0 98/08/13 */
/******************************************************************
* Numtest
*
* Input:
* x - pointer to a floating point value
*
* Output:
* An integer that indicates what kind of number was passed in:
* NUM = 3 - a finite value
* NAN = 2 - not a number
* INF = 1 - an infinite value
* 0 - zero
*
* Description:
* This routine returns an integer that indicates the character-
* istics of the number that was passed in.
*
*****************************************************************/
#include "fdlibm.h"
#include "zmath.h"
int
_DEFUN (numtestf, (float),
float x)
{
__int32_t wx;
int exp;
GET_FLOAT_WORD (wx, x);
exp = (wx & 0x7f800000) >> 23;
/* Check for a zero input. */
if (x == 0.0)
{
return (0);
}
/* Check for not a number or infinity. */
if (exp == 0x7f8)
{
if(wx & 0x7fffff)
return (NAN);
else
return (INF);
}
/* Otherwise it's a finite value. */
else
return (NUM);
}
#ifdef _DOUBLE_IS_32BITS
int numtest (double x)
{
return numtestf ((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */
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