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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/99428] possible missed optimization for dead code elimination
Date: Mon, 08 Mar 2021 08:56:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99428

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|tree-optimization           |ipa
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2021-03-08
                 CC|                            |hubicka at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
            Version|unknown                     |11.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
IPA - gimple "phase ordering" issue.  Alternatively when 'b' is discovered
read-only its analysis would need to consider the initializer propagated and
thus eventually not address-taken to make 'a' readonly as well ... (or apply
modref to tell 'a' is not written to?)=