addi    $s1,    $zero,  -2
    nop     
    nop     
    nop     
    nop     
start:
    addi    $s1,    $s1,    1
    nop     
    nop     
    nop     
    nop     
    bltz    $s1,    start
    nop     
    nop     
    nop     
    nop     
end:
    j       end