|
|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).

Why not instead add "rlf NORMAL,f" to the end?  This would [1] not trash W, and
[2] also preserve/restore the carry flag?