# sum = 0
# for (i = 0		;  i < n;  i++)
#	sum += i

  addi $s0,$zero,0   # $s0 sum = 0
  addi $s1,$zero,5   # $s1 n = 5 ;  arbitrary value
  addi $t0,$zero,0   # $t0 i = 0
loop:
  slt $t1,$t0,$s1        # i < n?
  beq $t1,$zero,exitloop # if not, exit
  add $s0,$s0,$t0        # sum += i
  addi $t0,$t0,1         # i++
  j loop
exitloop:
  add $v0,$zero,$s0      # $v0 has the sum