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From: "malat at debian dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/106322] tree-vectorize: Wrong code at O2
 level (-fno-tree-vectorize is working)
Date: Fri, 05 Aug 2022 13:14:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106322

--- Comment #15 from Mathieu Malaterre <malat at debian dot org> ---
(In reply to Mathieu Malaterre from comment #11)
> (In reply to Uro=C5=A1 Bizjak from comment #10)
> > The reason the test fails with gcc-12 is that gcc-12 enabled
> > auto-vectorisation for -O2.
>=20
> I can make the symptoms go away by doing: `-O2 -fno-tree-vectorize`. Since
> this affects also arm5 and powerpc, it seems the bug is somewhere in the
> shared 32bits code (bug does not affects 64bits arch for some reason).

The above is incorrect, since the symptoms are also going away on mips64el =
and
ppc64.=