In O3, only one algorithm, bpred_unit, is used, and gem5 also provides several other branch prediction algorithms. I want to compare the prediction accuracy of different algorithms, what should I do？Need to change the code? Need to rebuild gem5？
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In fact, by simply checking out this site, you'll realize that the BPredUnit::lookup is a pure virtual function, implemented in
The default BP is TournamentBP, you can check in m5out/config.ini [system.cpu.branchPred]
However, you can modify the option in the command line. For example "--bp-type=BiModeBP" will change the BP to BiModeBP.