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To: EricRR who wrote (107926)8/21/2000 7:22:04 PM
From: Scumbria  Read Replies (1) of 186894
 
Ratbert,

Sharky reports that Willy's branch prediction is 30% better than P3. If true, what does this mean for IPC?

It will improve it somewhat, but I am dubious about the claim. Most code has about 10-20% inherently unpredictable branches.

The real issue with branch prediction is not just the taken/not taken status, but also the prediction of the branch target address. There is no way to "predict" the impact of the alleged improvement, without more details.

Scumbria
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