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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/114702] Missed optimization: fail to infer c
 - b != if a + b != c
Date: Fri, 12 Apr 2024 22:33:45 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114702

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-04-12
           Severity|normal                      |enhancement
             Status|UNCONFIRMED                 |NEW
             Blocks|                            |85316

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.=20

VRP does some of this but I am not sure if it can be expanded to be handle =
more
general value relations here


Folding statement: if (_2 =3D=3D a_5(D))
 Registering value_relation (_2 =3D=3D a_5(D)) on (3->4)
 Registering value_relation (_2 !=3D a_5(D)) on (3->5)


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D85316
[Bug 85316] [meta-bug] VRP range propagation missed cases=