Honest, non-cynical question: Has Profile-Guided Optimization *ever* been practically useful, in a real-world, natively compiled use case?
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Thanks! This was really insightful. :)
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On that topic, I've been wondering whether PGO might be more helpful on simpler CPUs that don't do a lot of speculation, like low-power ARM cores, but I don't have a good intuition for how all of that works.
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