45. while loop example

• 
  # Translate to lower-level pseudocode:
  # sum = 0
  # i = 0
  # while (i < n) {
  #    sum = sum + i
  #    i = i + 1
  # }
  
      li   $t2, 0               # sum = 0
      li   $t1, 0               # i = 0
  
  loop:
      bge  $t1, $t0, endloop    # Loop begins: if i >= n goto endloop
      add  $t2, $t2, $t1        # sum = sum + i
      addi $t1, $t1, 1          # i = i + 1
      j    loop
  
  endloop:
      ...