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