Hi,

Start out with two dummy variables:

template        000000AB
mask            11111100

Do a loop where you rotate left both variables by the count of number.

After the loop:

var = var AND mask              ; clear out location of AB
var = var XOR template          ; put AB into var

Solution is faster with less code but more memory usage.

Regards,
Claudio

-----Oorspronkelijk bericht-----
Van: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]Namens Carlos Ojea
Verzonden: vrijdag 19 juli 2002 10:36
Aan: PICLIST@MITVMA.MIT.EDU
Onderwerp: [PIC]: Code optimization


Hello :

I want to optimize this :

If number = 2 then var = xxABxxxx
If number = 1 then var = xxxxABxx
If number = 0 then var = xxxxxxAB

I wrote this large code (assuming A is '0' and B is '1'):

movlw 0x02
BANKSEL number
xorwf number, W
bz n2          ; number is 2, so branch to n2
movlw 0x01
xorwf number, W
bz n1          ; number is 1, branch to n1
bcf var, 0x01  ;number is 0, write xxxxxxAx
bsf var, 0x00  ; write xxxxxxxB
goto finish


n2
bcf var, 0x05  ; write xxAxxxxx
bsf var, 0x04  ; write xxxBxxxx
goto finish


n1
bcf var, 0x03  ; write xxxxAxxx
bsf var, 0x02  ; write xxxxxBxx


finish
...
...
...
more code
...
...
...


Anyone knows how to optimize that?

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