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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/99373] unused static function not being removed in some
 cases after optimization
Date: Thu, 04 Mar 2021 08:44:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99373

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-03-04
                 CC|                            |hubicka at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is only IPA reference promotes 'd' constant and thus only late
optimization elides the call to 'j'.  That's too late to eliminate the
function.
Note we process 'j' first duing late opts (to make the late local IPA
pure-const
useful).

We'd need another IPA phase before RTL expansion to collect unreachable
functions again (IIRC the original parallel compilation GSoC project added
one).

I'm also quite sure we have a duplicate of this PR.=