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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111591] ppc64be: miscompilation with -mstrict-align /
 -O3
Date: Thu, 28 Sep 2023 00:20:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111591

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |linkw at gcc dot gn=
u.org
             Status|NEW                         |ASSIGNED

--- Comment #15 from Kewen Lin <linkw at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #14)
> (In reply to Kewen Lin from comment #13)
> > Thanks again for the reduced test case and the information!
> >=20
> > I tried to bisect it but encountered some build failures on _Float32 er=
ror
> > etc., through grepping the log I switched to start from r13-2887 (good)=
 to
> > r13-7206 (bad).
> >=20
> > The bisection shows the culprit commit is r13-3378-gf6c168f8c06047 whic=
h was
> > backported to GCC-12, it seems to match the observation new gcc-12 fail
> > while gcc-11 pass.
>=20
> Note this change likely triggers a latent issue but it might help analyzi=
ng
> the issue.

Thanks for the hint! Yeah, I tried -fdisable-tree-esra and -fdisable-tree-s=
ra,
the failure is still there, I supposed that commit only takes effect when S=
RA
is enabled. I'll continue to investigate it. btw, I'm just starting two wee=
ks
vacation so may respond slowly.=