Pipelining and JMP

Problem with a question that was asked in a book. The question is:

Quote:

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Why are jump (JMP) instructions so disrupting for system that use Pipelining ?

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Is it because the next instructions can't be loaded yet when the Jump is not totally executed ? Is that an error-proof answer ?

Thanks :)

That's essentially it. The pipeline may prefetch instructions, but those might be the wrong instructions, so the pipeline has to be flushed and all the work done is lost.