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Technology Stocks : Intel Corporation (INTC)

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3:59 PM EST

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To: Joe NYC who wrote (151254)	12/5/2001 7:38:59 PM
From: wanna_bmw	Read Replies (1) of 186894

Joe, Re: "There may be pipeline flushes, but I think you are looking for them in the wrong place. It is not the lookup that is time consuming." Actually, Tenchusatsu has a point. Recall that the execution stage on the Pentium 4 is the 18th stage in the pipeline. Therefore, once the pipeline has been flushed, those ADD instructions have an 18-cycle latency before they reach the execution stage. With a randomized location in the lookup table, the branch predictor is bound to be wrong on occasion. That's because the location of the instruction is not determined until the randomized function has been processed, which is once per iteration. Therefore, branch instructions cannot be predicted ahead of time. You have to take the latency of the longer pipeline into effect. wbmw

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