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To: Scumbria who wrote (107894)8/21/2000 1:55:54 PM
From: Tenchusatsu  Read Replies (2) of 186894
 
Scumbria, <I'm questioning how many bubbles it will remove. That is what determines it value to performance.>

I think you're looking at the wrong thing. The pipeline bubbles will be there no matter what, and increasing the width or the speed of the integer execution unit isn't going to do a thing about those bubbles.

But if you have a loop of code that will be iterated many, many times, the pipeline bubbles will be reduced down to a minimum. Then performance is limited by how many clock cycles it will take to execute the instructions per iteration. And the more instructions you can squeeze in per clock, the better. Of course, the squeezing will be limited by hazards, especially data dependencies. But since Willamette's double-speed ALU can remove some data hazards, its integer unit will be able to execute more instructions per clock (on average) than a traditional 4-issue integer unit.

Tenchusatsu
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