[Bug tree-optimization/107467] [12/13 Regression] Miscompilation involing -Os , -flto and -fno-strict-aliasing

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107467

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|marxin at gcc dot gnu.org          |unassigned at gcc dot gnu.org
           Keywords|needs-bisection             |
             Status|ASSIGNED                    |NEW

--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Running that under valgrind I see it started with r12-656-ga564da506f52be66:

==13643== Conditional jump or move depends on uninitialised value(s)
==13643==    at 0x401148: bool compare_pairs<SomeClass*>(pair<SomeClass*>
const&, pair<SomeClass*> const&) (pr107467-2.C:12)
==13643==    by 0x401176: Combined<OtherClass>::clashy() [clone .isra.0]
(pr107467-2.C:23)
==13643==    by 0x4011B2: other_func() (pr107467-2.C:40)
==13643==    by 0x4011ED: main (pr107467-2.C:48)

So I guess it might be something in between DSE and aliasing info investigated
by IPA modref.

@Honza: Can you take a look?