Another message accidentally sent to me instead of to the
     PICLIST...

------- Forwarded Message Follows -------

Date:          Thu, 18 Sep 1997 04:51:00 +0400
From:          Dmitry Kiryashov <zews@aha.ru>
To:            fastfwd@ix.netcom.com
Subject:       Re: (Fwd) Re: Bit Number to Bit Mask Question

> Hmm...
>  movlw  $01
>  btfsc  BITNUM,1
>   movlw $04
>  movwf  temp
>  bcf    C
>  btfsc  BITNUM,0
>  rlf    temp
>  movf   temp,w
>  btfsc  BITNUM,2
>   swapf temp,w
>
> Not terribly encouraging (10 words/10 cycles).  Maybe...

;       Minimizing ... Final pass .
;
 movlw  $01
 btfsc  BITNUM,1
 movlw  $04
 movwf  temp

 btfsc  BITNUM,0
 addwf  temp,f

 btfsc  BITNUM,2
 swapf  temp,f

 movfw  temp

;       9 words / 9 cycles
;



>  movlw  $FF
>  btfsc  BITNUM,0
>   andlw $AA
>  btfsc  BITNUM,1
>   andlw $CC
>  btfsc  BITNUM,2
>   andlw $F0
>  movwf  temp

;       Optimizing ...

>  comf   temp
>  incf   temp
>  andwf  temp,w

;       Done .

 sublw  0
 andwf  temp,w
;
;       10 words / 10 clocks


> Interesting, but even worse (unless I'm missing an optimization on
> that ending part).  Anyone see any improvements for those two methods
> above?


The first code looks better .

WBR Dmitry .

------ End of Forwarded Message -------


=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
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