Pretty logical extension. It still takes only 12 cycles if a+0 != 0. 24 cycles if also a+1 != 0 (=every 256th round), etc. The worst case time is when whole 3

Pretty logical extension. It still takes only 12 cycles if a+0 != 0. 24 cycles if also a+1 != 0 (=every 256th round), etc. The worst case time is when whole 32-bit counter is zero, 12 clk * 3 + 6 clk = 42 clk. (Disclaimer: clock counts assume original snippet counts were correct).