I would like to thank all my Twitter followers for ensuring in this thread that, indeed, I *did* in fact die on this hill, repeatedly and pointlessly.https://twitter.com/chandlerc1024/status/1261006073789480960 …
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if you place the branch the right way around, you can probably even make the type confusion happen on BTB miss, so no messy training will be necessary
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Measure performance in a microbenchmark carefully crafted such that the branch predictor state is gone on every call and the function pointer is evicted from at least L1D.
End of conversation
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