From: Regulus Berdin
mov W, twofour0 add prod0, W mov W, twofour1 snb C movsz W, ++twofour1 add prod1, W mov W, twofour2 snb C movsz W, ++twofour2 add prod2, W mov W, twofour3 snb C movsz W, ++twofour3 add prod3, W