[Bug middle-end/110228] [13/14 Regression] llvm-16 miscompiled due to an maybe uninitialized variable

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110228

--- Comment #31 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Zhendong Su from comment #30)
> (In reply to Richard Biener from comment #29)
> > I can't reproduce the original failure on trunk or with GCC 13.1, but the
> > testcase from comment#16 is now fixed.  I also cannot reproduce the testcase
> > from comment#21 before the fix.
> > 
> > Can people double-check this is now fixed, maybe also on the branch when this
> > fix is cherry-picked?
> > 
> > Thanks.
> 
> I can still reproduce the test from comment#21 as well as PR 110491 and PR
> 110509.

PR110491 still reproduces after my fix (and PHI-OPT fixed the same way).
The two other non-deterministic ones don't reproduce before/after
(or I misunderstand how they work).

> PR 110376 doesn't reproduce for me anymore.

I'm going to add this as testcase.

So I think there's more analysis necessary and I didn't fix the underlying
issues in the other PRs.