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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/110410] [14 Regression] Different results
 between -O0 and -O2
Date: Mon, 26 Jun 2023 16:07:04 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization, wrong-code
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X-Bugzilla-Who: pinskia at gcc dot gnu.org
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Message-ID: <bug-110410-4-j5T4pmFbow@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110410

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |110252
             Status|UNCONFIRMED                 |NEW
           Keywords|needs-bisection             |missed-optimization
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-06-26

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is basically a dup of bug 110252 as the range of iftmp.7_27 is flow
sensitive here.

BUT there is a missed optimization before hand though:
  # RANGE [irange] unsigned int [0, 0] NONZERO 0x0
  iftmp.7_27 =3D (unsigned intD.9) _7;

This shows up in dom3. So keeping it open for that case too ...


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110252
[Bug 110252] [14 Regression] Wrong code at -O2/3/s on x86_64-linux-gnu=