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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105618] [11/12/13 Regression] Missed loop
 body simplification by -O3 (trunk v.s. 10.3)
Date: Tue, 17 May 2022 06:57:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105618

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
            Summary|Missed loop body            |[11/12/13 Regression]
                   |simplification by -O3       |Missed loop body
                   |(trunk v.s. 10.3)           |simplification by -O3
                   |                            |(trunk v.s. 10.3)
   Target Milestone|---                         |11.4
   Last reconfirmed|                            |2022-05-17
           Keywords|                            |missed-optimization,
                   |                            |needs-bisection
      Known to fail|                            |11.3.1, 12.1.1
     Ever confirmed|0                           |1
      Known to work|                            |10.3.1
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  GCC 10 manages to sink the load from e out of the loop while GC=
C 12
fails to do that.=