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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110992] [14 Regression] Dead Code Elimination
 Regression at -O3 since r14-1654-g7ceed7e3e29
Date: Fri, 11 Aug 2023 17:38:13 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110992

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |14.0
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-08-11
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed the problem is ethread is not able to do the jump threading with =
the
new IR:
```
Checking profitability of path (backwards):  bb:3 (3 insns) bb:2
  Control statement insns: 2
  Overall: 1 insns

 Registering killing_def (path_oracle) b.0_1
 Registering killing_def (path_oracle) _7
 Registering killing_def (path_oracle) _6
 Registering killing_def (path_oracle) _25
 Registering killing_def (path_oracle) _3
 Registering killing_def (path_oracle) c.1_2
path: 2->3->xx REJECTED
```

I don't understand why though ...=