if (it == null) push(new Item(signature, register));
if (it == null) { Item item = new Item(signature); item.registerNumber = register; push(item); }
 	private void pushByLocalLoad(String signature, int register) {		Item it = getLVValue(register);		if (it == null)			push(new Item(signature, register));		else if (it.getRegisterNumber() >= 0)			push(it);		else  {			push(new Item(it, register));			} 	}