On Mon, 2 Apr 2001, Olin Lathrop wrote:

> > 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.

Is it worth mentioning that you can save one instruction? Or how about two more
if you don't care about the carry out?

Scott

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