VAND Documentation
John Strawn

9 September 1987

This one is almost straightforward.  Here are the steps to be done:
(but this is buggy! see below)

          move           x:(r5),x0
          move           y:(r1),a
          and  x0,a
          move           a,x:(r6)

; And here is how those particular moves *would* be merged:

          ; pipeline initialization
          move           x:(r5),x0 
          move           y:(r1),a
          and  x0,a      x:(r5),x0 
          ; main loop
          move           a,x:(r6)  y:(r1),a
          and  x0,a      x:(r5),x0 

But the bug is that you'll get limiting if the high-order bit in
a1 is on after the and. Therefore, the only way to be safe is:

          move           x:(r5),x0
          move           y:(r1),a
          and  x0,a
          move           a1,x:(r6)

; for a minimum of three instructions