LOAD R1, A
INCR R1
LOAD R2, B
ADD  R3, R1, R2
INCR R2
STORE A, R1
STORE B, R2

##</code><code>##

LOAD R1, A
INCR R1
STORE A, R1
LOAD R2, B
ADD R3, R1, R2
INCR R2
STORE B, R2