 Kogge–Stone adder

In computing, the Kogge–Stone adder (KSA or KS) is a parallel prefix form carry look-ahead adder.Other parallel prefix adders (PPA) include the "Brent–Kung adder" (BKA), the "Han–Carlson adder" (HCA), and the fastest known variation, the "Lynch–Swartzlander spanning tree adder" (STA).