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/* @(#)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)

{

  __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) */