> > Given:   X1 and X2 and RESULT are each 3 bytes long
> >
> >     movf    X1,W
> >     movwf  RESULT
> >     movf    X1+1,W
> >     movwf    RESULT
> >     movf    X1+2,W
> >     movwf    RESULT
> >
> >     movf    X2,W
> >     addwf    RESULT,F
> >
> >     movf    X2+1,W
> >     skpnc
> >      incfsz    X2+1,W
> >     addwf    RESULT+1,F
> >
> >     movf    X2+2,W
> >     skpnc
> >     incfsz   X2+2,W
> >     addwf    RESULT+2,F
>
> I like your method of SKIPNC followed by INCFSZ, I hadn't thought of that.
> I have been using a far more clunky method with a temp variable to deal
with
> carry from propagate carry.
>
> However, in case anyone may be copying and pasting this code, the last two
> MOVWF in the first block should be to RESULT+1 and RESULT+2.
>
> Olin Lathrop

oops!

By the way: I didn't invent this. It is in one of the Microchop app notes
and I've seen it used all over the place.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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