Scott Dattalo tried to tell me...

>Here's another PIC bit-banging challenge. Given a two-bit variable
>create the three-bit variable:
>
>   A   |    B
>-------+--------
>  00   |   000
>  01   |   001
>  10   |   011
>  11   |   111
>
>Bonus points to those who can:
>  1) Keep A unchanged                  1 point
>  2) Clear the remaining bits of B     1 points
>  3) Isosynchronous execution          3 points
>  4) Keep W unchanged                  5 points
>
>Execution points:  15 - (maximum cycles to complete)

Here's my code:

out       goto      Done

start     btfss     A, 1
          goto      out
          btfsc     A, 0
          bsf       A, 2
          bsf       A, 0

Done      whatever

This scores 18
cycles - 5 (15 -5 = 10)
isosynchronous      3
w intact            5

I'm assuming that the rest bit 2 of A is clear initially.  If it's not,
insert the following
at start:

start     movlw     kMASK
          xorwf     A, F

for a new score of 12

or, insert this at start

start     bcf       A, 2

for a new score of 17

Jason