case InstructionConstants.OP_DUP2:
                    conditionallyMarkStackEntryProducers(offset, 0, 0);
                    conditionallyMarkStackEntryProducers(offset, 1, 1);
                    conditionallyMarkStackEntryProducers(offset, 2, 0);
                    conditionallyMarkStackEntryProducers(offset, 3, 1);