; reduce  sum r2 across PEs

ld 0 @100
ld 1 @101
ld 2 @102
ld 3 @103
ldr 2      ; initialise all R2
str 2
bc 3 1     ;  R30 = R21
bc 4 2     ;  R40 = R22
bc 5 3     ;  R50 = R23
add 6 2 3  ;  R60 = R20 + R21
add 6 6 4  ;  R60 = R20 + R21 + R22
add 6 6 5  ;  R60 = R20 + R21 + R22 + R23
mov 0 6    ;  show result in R0
sys 4      ;  stop simulation
.end
@100
11 22 33 44
.end