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2018 Aug 14
4
Why did Intel change his static branch prediction mechanism during these years?
( I don't know if it's allowed to ask such question, if not, please remind me. )
I know Intel implemented several static branch prediction mechanisms
these years:
* 80486 age: Always-not-take
* Pentium4 age: Backwards Taken/Forwards Not-Taken
* PM, Core2: Didn't use static prediction, randomly depending on
what happens to be in corresponding BTB entry , according to agner's