addi $s0, $t0, 4

lw $t0, 0 ($s0)

add $t0, $t0, $t1

we need to used instruction pipeline why would we need stalls in this with the load word ,but when use store word we dont need any stalls at all?

addi $s0, $t0, 4

sw $t0, 0 ($s0)

add $t0, $t0, $t1