protected DoubleWordItem(int kind, int offsetToFP, Register lsb, Register msb) { super(kind, offsetToFP); this.lsb = lsb; this.msb = msb; }
protected DoubleWordItem(ItemFactory factory) { super(factory); }
	protected DoubleWordItem(int kind, int offsetToFP, Register lsb,			Register msb) {		super(kind, offsetToFP);		this.lsb = lsb;		this.msb = msb;	}