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[Bug tree-optimization/77689] Missing vectorization lead to huge performance loss
- From: "trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 22 Sep 2016 11:31:36 +0000
- Subject: [Bug tree-optimization/77689] Missing vectorization lead to huge performance loss
- Auto-submitted: auto-generated
- References: <bug-77689-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77689
--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> (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.
Yes. with "return a[s];" added clang actually generates worse code than gcc.