does this work?

neg_BARG        comf    BARGB3,f
                comf    BARGB2,f
                comf    BARGB1,f
                comf    BARGB0,f
                incf    BARGB3
                btfsc   STATUS,Z
                incf    BARGB2
                btfsc   STATUS,Z
                incf    BARGB1
                btfsc   STATUS,Z
                incf    BARGB0
                retlw   0

Peter van Hoof
-------------
mailto:pvh@vertonet.com
http://go.to/pvh

> I am looking for a code fragment which calcuates the two's
> complemnt of a 32
> bit word (4 bytes)
>
> I'd prefer a specific code fragment.
>
> The fragment below is close, but it doesn't work
>
> ;This changes BARG into -BARG in two's complement form
> ; BARGB3 is the low byte,.... BARGB0 is the high byte
>
> neg_BARG        comf    BARGB3
>                 incf    BARGB3
>                 btfsc   STATUS,Z
>                 decf    BARGB2
>                 comf    BARGB2
> ;
>                 incf    BARGB2
>                 btfsc   STATUS,Z
>                 decf    BARGB1
>                 comf    BARGB1
> ;
>                 incf    BARGB1
>                 btfsc   STATUS,Z
>                 decf    BARGB0
>                 comf    BARGB0
>                 retlw   0
>
>
> Thank you