> From: David Tait <david@comms.ee.man.ac.uk>
> [cut]
>         CLRF     REVERSE         ; Precondition Register to 0
>         BTFSC   NORMAL, 7        ; MSb set?
>         BSF       REVERSE, 0     ; Set LSb
>         BTFSC   NORMAL, 6        ; bit set?
>         BSF       REVERSE, 1     ; Set bit
>         BTFSC   NORMAL, 5        ; bit set?
>         BSF       REVERSE, 2     ; Set bit
>         BTFSC   NORMAL, 4        ; bit set?
>         BSF       REVERSE, 3     ; Set bit
>         BTFSC   NORMAL, 3        ; bit set?
>         BSF       REVERSE, 4     ; Set bit
>         BTFSC   NORMAL, 2        ; bit set?
>         BSF       REVERSE, 5     ; Set bit
>         BTFSC   NORMAL, 1        ; bit set?
>         BSF       REVERSE, 6     ; Set bit
>         BTFSC   NORMAL, 0        ; bit set?
>         BSF       REVERSE, 7     ; Set bit
>
> But then again this might be too obvious for the PICLIST ...
>
> David

Yes, it's too obvious.  Shave one cycle with:

  rrf  NORMAL
  rlf  REVERSE
  ... (repeat 8 times total)

Unfortunately, NORMAL is destroyed in the process.  However, we can turn
this to our advantage if we want to bit reverse TWO registers at once:
just add

  rlf  REVERSE,w

at the beginning.  Both NORMAL and REVERSE will be swapped and reversed
at the expense of W which is now destroyed (althouh hopefully not
irreparably).

Regards,
SJH
Canberra, Australia