Why are BIM entries initialized as "taken"?

[Alvise de Faveri Tron]

I am looking at the implementation of BOOM's BIM predictor, specifically this line:

Mux(doing_reset,
      VecInit(Seq.fill(bankWidth) { 2.U }),
      s1_update_wdata),

Does this mean that the default prediction for branches is "taken"? If so, why is that the case? I would expect (forward) branches to be statically predicted not-taken. Is there any particular reason not to do that?

Thanks in advance!

[Jerry Zhao]

That is just initializing the state after reset. The predictor behavior immediately after reset wasn't ever optimized.

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