CompOrg Exam 2009B A1 Q 3.1

# Assume A and B are int arrays
addi $t0, $a1, 400  # $t0 = one element past end of array A
loop:
addi $a1, $a1, 1 # A++
addi $a2, $a2, 1 # B++
lw $t1, 0($a2) # $t1 = B[i]
bltz $t1, loop  # goto loop if B[i] is less than 0
lw $t2, -4($a1) # $t2 = A[i-1]
add $t3, $t1, $t2
sw $t3, 0($a1)
bne $a1, $t0, loop # while $a1 != $t0