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

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2000-02-18 03:39:52 +08:00
/* @(#)z_isinf.c 1.0 98/08/13 */
/******************************************************************
* isinf
*
* 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"
#ifndef _DOUBLE_IS_32BITS
int isinf (double x)
{
__uint32_t lx, hx;
int exp;
EXTRACT_WORDS (hx, lx, x);
exp = (hx & 0x7ff00000) >> 20;
if ((exp == 0x7ff) && ((hx & 0xf0000 || lx) == 0))
return (1);
else
return (0);
}
#endif /* _DOUBLE_IS_32BITS */