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Two-level/Correlation predictor (Yeh-Patt’92,Pan-Soh-Rameh’92)
Branches are correlated one to the other
We keep a shift register with the most recent branch outcomes
We index a bimodal table(Pattern History Table) with this branch history register (BHT)
We can keep only one global BHT for all the branches (global 2-level predictor) or a BHT per each branch (local 2-level predictor). The same we can do for the PHT.
Author: Roberto Innocente