Tracy Smith wrote:

> How about this... (John Payson)

        movwf   source      a   b   c   d   e   f   g   h
        btfsc   source,0
         xorlw  h'41'       a  b+h  c   d   e   f   g   0
        btfsc   source,6
         xorlw  h'41'       a   h   c   d   e   f   g   b
        btfsc   source,1
         xorlw  h'22'       a   h  c+g  d   e   f   0   b
        btfsc   source,5
         xorlw  h'22'       a   h   g   d   e   f   c   b
        btfsc   source,2
         xorlw  h'14'       a   h   g  d+f  e   0   c   b
        btfsc   source,4
         xorlw  h'14'       a   h   g   f   e   d   c   b

  Cute, but you haven't completed the reverse - a rotate *without*
carry is required.  That's going to take two more cycles at least.
--
  Cheers,
        Paul B.