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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99927] [11 Regression] Maybe wrong code since
 r11-39-gf9e1ea10e657af9f
Date: Tue, 06 Apr 2021 08:54:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99927

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-04-06
                 CC|                            |amacleod at redhat dot com
           Priority|P3                          |P1
   Target Milestone|---                         |11.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
-fdisable-tree-cunroll fixes it but not disabling the lim pass after it but
disabling lim2 which then no longer makes us unroll the loop.

Disabling DOM3 _and_ VRP2 also fixes the issue, it looks like some bogus VRP
gets triggered.=