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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109002] [13 Regression] -O1 -ftree-pre
 -ftree-partial-pre results in stall value
Date: Fri, 03 Mar 2023 09:55:36 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: needs-bisection
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X-Bugzilla-Who: rguenth at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109002

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|-O1 -ftree-pre              |[13 Regression] -O1
                   |-ftree-partial-pre results  |-ftree-pre
                   |in stall value              |-ftree-partial-pre results
                   |                            |in stall value
   Target Milestone|---                         |13.0
      Known to work|                            |12.2.0
           Priority|P3                          |P1
           Keywords|                            |needs-bisection

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Looks like GCC 12 "works", I suspect the compile-time optimizations in prun=
ing
to be the reason since PA_IN has bogus virtual operands in expressions whic=
h is
what the fix fixes.=