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[Bug tree-optimization/77689] Missing vectorization lead to huge performance loss


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77689

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Markus Trippelsdorf from comment #2)
> Clang is pretty impressive using libc++ and -Ofast:

Looks like they can remove all stores from the loop.  Though it does not remove
the empty loop afterwards though.

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