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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113551] [13 Regression] Miscompilation with
 -O1 -funswitch-loops -fno-strict-overflow
Date: Tue, 23 Jan 2024 08:03:49 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.2.0
X-Bugzilla-Keywords: needs-bisection, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113551

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|rguenth at gcc dot gnu.org         |unassigned at gcc d=
ot gnu.org
             Status|ASSIGNED                    |NEW
           Priority|P3                          |P2
      Known to work|                            |14.0
            Summary|[13/14 Regression]          |[13 Regression]
                   |Miscompilation with -O1     |Miscompilation with -O1
                   |-funswitch-loops            |-funswitch-loops
                   |-fno-strict-overflow        |-fno-strict-overflow
                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
The IL after unswitching looks OK, but we assume that when &dso->i is NULL
then dso =3D=3D NULL and when &dso->i is not NULL then dso also isn't.

I think this is a ranger bug that has been fixed on trunk
but eventually not yet backported, thus we have a duplicate somewhere.

Bisection will tell.=