*----------------------------------------------------------------------
 *
 * RequiredPrecision --
 *
 *	Determines the number of bits needed to hold an intger.
 *
 * Results:
 *	Returns the position of the most significant bit (0 - 63).  Returns 0
 *	Returns the position of the most significant bit (1 - 64), starting
 * 	the counting at 1 for the LSB.  (RP(1) -> 1).  Returns 0
 *	if the number is zero.
 *
 *----------------------------------------------------------------------
 */

static int
RequiredPrecision(