newlib-cygwin/newlib/libm/mathfp/sf_isinf.c

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2000-02-18 03:39:52 +08:00
/* @(#)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
_DEFUN (isinff, (float),
float x)
2000-02-18 03:39:52 +08:00
{
__uint32_t wx;
int exp;
GET_FLOAT_WORD (wx, x);
exp = (wx & 0x7f800000) >> 23;
if ((exp == 0x7f8) && !(wx & 0xf0000))
return (1);
else
return (0);
}
#ifdef _DOUBLE_IS_32BITS
int
_DEFUN (isinf, (double),
double x)
{
return isinff ((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */