Oh well, I was just trying to make a point and that code had the
different things I wanted to point out. But then, that's what
disclaimers are for.

Al Williams
AWC
* Floating point A/D
http://www.al-williams.com/awce/pak9.htm



> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Scott Dattalo
> Sent: Friday, March 29, 2002 8:44 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: RE: Macro or Goto
>
>
> On Fri, 29 Mar 2002, Al Williams wrote:
>
> > So for example, suppose you want to multiply num by 10 (perhaps not
> > the best way to do it, but that's OK; and from memory, so maybe not
> > exactly right even):
> >
> > X10:   bcf status,c
> >        rlf num,f
> >        movf num,w        ; w=num*2
> >        bcf status,c
> >        rlf num,f
> >        bcf status,c
> >        rlf num,f         ; num=num*8
> >        addwf num,f     ; num = num*2 + num*8 = 10*num
> >        return
>
> You're right, it's not the best way. This way is better:
>
> X10:
>
>     movf   num,w  ;  w = num
>     addwf  num,f  ;num = 2*num
>     addwf  num,w  ;  w = 3*num
>     addwf  num,f  ;num = 5*num
>     movf   num,w  ;  w = 5*num
>     addwf  num,f  ;num = 10*num
>
>
> :)
>
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