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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102892] [12 Regression] Dead Code Elimination
 Regression at -O3 (trunk vs 11.2.0)
Date: Sat, 23 Oct 2021 09:29:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102892

Aldy Hernandez <aldyh at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-10-23
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #2 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #1)
> Maybe a duplicate of PR102879?

Hmmm, maybe not.

It doesn't look like a threading thing after a quick glance.  We only threa=
d 1
path, in both 11.2 and trunk:

a.c.193t.dom3:  [4] Registering jump thread: (11, 3) incoming edge;  (3, 5)
joiner (5, 12) normal;=20

And it's actually in DOM which has been largely untouched in this release.

Could someone bisect this?=