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/* @(#)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 */