> I think such an optimization is worth it at least on high-end machines. And
> there is still the possibility of a compile-time option or a patch, right?
>
> I'm no expert, so how can those problematic (old PPro) chips be detected,
> btw?
As a worst case, we could blacklist all PPro's.
And then test them on various steppings, and unlist the steppings which work.
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