On Thu, 13 Dec 2001, Drew Vassallo wrote:

> > >     movf    hourhand, w ;
> > >     bcf     status, c   ;
> > >     rlf     hourhand, f ;hourhand X2
> > >     rlf     hourhand, f ;hourhand X2
> > >     addwf   hourhand, f ;wreg still contain original value of hourhand??
>
> You can save one instruction I think:
>
> bcf STATUS, C       ; or use "clrc"
> rlf hourhand, w     ; W=hourhand*2
> addwf hourhand, f   ; =hourhand*3 (hourhand+hourhand*2)
> addwf hourhand, f   ; =hourhand*5 (hourhand*3+hourhand*2)

That works, but it sounds like the goal is to keep "hourhand" in W instead
of 2 times hourhand. Consider this snippet:

   movf  hourhand,w
   addwf hourhand,f   ; 2*
   rlf   hourhand,f   ; 4*
   addwf hourhand,f   ; 5* and w still contains the original

Scott

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