Given the following mips code snippet (note that instruction #6 could be anything):
loop:
1. addi $t0, $t0, 4
2. lw $v0, 0($t0)
3. sw $v0, 20($t0)
4. lw $s0 60($t0)
5. bne $s0, $0, loop
6. ##the following instruction could be anything
a. detect hazards and insert no-ops to insure correct operation. assume no delayed branch, no forwarding units and no interlocked pipeline stages. your answer on the right should take the form of pair(s) of numbers: num@location – indicating num no-ops should be placed at location. e. g., if you wanted to place 6 noops between lines 2 and 3 (i. e., location=2.5) and 8 noops between lines 5 and 6 (i. e., location=5.5), you would write: "[email protected], [email protected]". b. now, reorder/rewrite the program to maximize performance. assume delayed branch and forwarding units, but no interlocked pipeline stages. for unknown reasons, the first instruction after the loop label must be the addi. feel free to insert no-ops where needed.