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To: EricRR who wrote (107926)8/21/2000 7:32:46 PM
From: Tenchusatsu  Read Replies (3) of 186894
 
Ratbert, <70% x2 pipeline size comes out to 140% percent branch penalty>

Don't forget that part of the penalty is reduced thanks to the Execution Trace Cache. Instead of having to decode instructions again from the mispredicted branch onward, the pipeline can immediately be filled with predecoded instructions in program order.

Also remember that Pentium III's pipeline was 12-14 stages, not 10 stages as you are assuming in your "x2 pipeline" phrase.

Tenchusatsu
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