oops...
one invertion is required.
in subc operation C flag being treated as borrow -
so subc does subtract source and borrow from destination.
so:
rla r14
subc r14, r14
inv r14
I forgot that I already made it in casting...
~d
On Thursday 30 January 2003 12:51, Dmitry wrote:
> super!
>
> how do you think, will this work:
>
> rla r14
> subc r14,r14
>
> where all regs are the same?
>
>
> ~d
>
> On Thursday 30 January 2003 12:52, Steve Underwood wrote:
> > Dmitry wrote:
> > >oops...
> > >no...
> > > rla r15 ; move MSB to carry
> > > clr r14 ; move zero to r14 (carry isn't clobbered)
> > > subc #0, r14 ; subtract carry
> >
> > Can't that be reduced to:
> >
> > rla r15
> > subc r14,r14
> >
> > Regards,
> > Steve
> >
> >
> >
> >
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