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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/109585] Carla/sord miscompiled with -O2 on ARM64
 with flexible array member
Date: Fri, 21 Apr 2023 17:16:16 +0000
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X-Bugzilla-Product: gcc
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X-Bugzilla-Version: 12.1.0
X-Bugzilla-Keywords: alias, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109585

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Carla/sord miscompiled with |Carla/sord miscompiled with
                   |-O2 on ARM64 (inlining      |-O2 on ARM64 with flexible
                   |issue)                      |array member

--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like the aliasing code is getting the flexible array member aliasing
wrong.

Replacing:
ZixBTreeIterFrame stack[];

With:
ZixBTreeIterFrame stack[1];

Fixes the issue ...=