addiu $t1, $zero, 3
addiu $t2, $zero, 0
loop: addu $t2, $t2, $t1
addiu $t1, $t1, -1
bnez $t1, loop
or $t3, $zero, $t1
sll $t4, $t1, 2
and $t5, $t1, $t5
or $t6, $t1, $t6