Dmitry Kiryashov wrote:
>
> Hi Roman. ;)
>
> > > Could be: (.0 to .0 or whatever)
> > >
> > >         rrf     N,F     ;push .0 out save old Cy inside
> > >         rrf     I,W     ;copy .0 to Cy
> > >         rlf     N,F     ;copy Cy to .0 restore old Cy
> > >
> > > Here is no parallel operations at all and for this case
> > > number 3 is seems to be another magical number for PIC ;)
> >
> > Dmitry, doesn't the rrf I,W destroy the carry bit,
> > ie puts the old W.7 in carry bit? Then your next
> > instruction won't restore it??
> > -Roman
>
> There is nothing to destroy ;) since previous rrf N,F has stored
>  _original_ Cy into N.7
> Then you push I.0 out to Cy (rrf I,W nobody cares about previous
>  N.0 right ? )
> Then you push Cy into N.0 with restoring original Cy from N.7
>
> Isn't perfect anyway. ;)

Ok, that's waht I understood, it restores carry but
destroys the old N.0 after testing it. :o)
-Roman

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