> missing

Yes, I goofed. I have redone it, this time filling in all the details, and
it is 7 cycles (like other's), destroys W, and not optimal. It is still
untested:

        decf    M
        decf    L
        incfsz  L, W
          incf  M
        decf    H
        incfsz  M, W
          incf  H

But the method using subwfs is better and clearer, imho, they win 8) :

        movlw   1
        subwf   L, F
        btfss   PSW, CY
          subwf M, F
        btfss   PSW, CY
          subwf H, F
        ...

Peter