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That may have been true, but it is rather dramatically false with the new JCC erratum workaround.

It’s also false if you’re using a hypervisor that mitigates the iTLB multihit issue.




Good point, I forgot about that one, although here there is only a single hot loop with one jump so a high chance the crossing doesn't occur, and even if it does the IPC is low enough the legacy decoder probably does OK (although it adds a cycle or two to misprediction recovery, which matters here).

So it's something worth checking.

No hypervisor involved.




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