Question

Why is reducing the number of jumps important for modern processors?

a.

It reduces the amount of time wasted in refilling the pipeline

b.

It increases the number of instructions added to the pipeline

c.

It decreases the number of instructions added to the pipeline

d.

It increases the number of pipeline stages

Posted under Reverse Engineering

Answer: (a).It reduces the amount of time wasted in refilling the pipeline Explanation:When a processor encounters a conditional jump, it must guess or predict whether the jump will take place or not, and based on that guess decide which instructions to add to the end of the pipeline. If it guesses wrong, the entire pipeline is emptied and must be refilled. The amount of time wasted in these situations heavily depends on the processor’s internal design and primarily on its pipeline length, but in most pipelined CPUs refilling the pipeline is a highly expensive operation.

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