for(int i = 0; i < stack.getNumLastUpdates(); i++)
numLastUpdates = stack.getNumLastUpdates(); for(int i = 0; i < numLastUpdates; i++)
		BackwardsBranch(OpcodeStack stack, int from, int to) {			super(from,to);			for(int i = 0; i < stack.getNumLastUpdates(); i++) 				if (stack.getLastUpdate(i) < to) 					invariantRegisters.add(i);			}