In the class, we have shown how to maximize performance on our pipelined datapath with forwarding...
In the class, we have shown how to maximize performance on our pipelined datapath with forwarding and stalls on a use following a load. Rewrite the following code to minimize performance on this datapath – that is, reorder the instructions so that this sequence takes the most clock cycles to execute while still obtaining the same result:
lw $3, 0($5)
lw $4, 4($5)
add $7, $7, $3
add $8, $8, $4
add $10, $7, $8
sw $6, 0($5)
beq $10, $11, loop
Homework Answers
The only stalls occur when loads are followed by uses. There are two occurrences of this in this code fragment. So, reorder as follows:
lw $3,0($5)
add $7, $7, $3
lw $4, 4($5)
add $8, $8, $4
add $10, $7, $8
sw $6, 0($5)
beq $10, $11, Loop
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In the class, we have shown how to maximize performance
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