10-21-2014, 06:08 AM
It is very much a ripple carry adder. A carry look ahead adder will actually have additional logic to compute the values of the carry before it arrives, (thus a look-ahead) while a ripple carry adder will have the vale of the carry pass through the adder of each individual digit before being allowed to move to the next digit. In general, ripple carry is slower; but in minecraft, the "instant" nature of restone (up to fifteen blocks, of course) makes it possible to create ripple carry adders that are faster than the equivalent carry look ahead adder.