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Thread: Pipelining and JMP

  1. Jan 24th, 2007, 11:30 AM #1
    BramVandenbon
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    Pipelining and JMP

    Problem with a question that was asked in a book. The question is:
    Why are jump (JMP) instructions so disrupting for system that use Pipelining ?
    Is it because the next instructions can't be loaded yet when the Jump is not totally executed ? Is that an error-proof answer ?

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  2. Jan 24th, 2007, 12:43 PM #2
    CornedBee
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    Re: Pipelining and JMP

    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.
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