From: Jan Hubicka <hubicka@kam.mff.cuni.cz>
To: Jakub Jelinek <jakub@redhat.com>
Cc: Richard Biener <rguenther@suse.de>, gcc-patches@gcc.gnu.org
Subject: Re: [PATCH] cgraph: Don't verify semantic_interposition flag for aliases [PR105399]
Date: Thu, 28 Apr 2022 14:00:09 +0200 [thread overview]
Message-ID: <YmqByQsdIAOQ+S9Z@kam.mff.cuni.cz> (raw)
In-Reply-To: <YmqBMeAcn/Duty6t@tucnak>
> On Thu, Apr 28, 2022 at 01:54:51PM +0200, Jan Hubicka wrote:
> > > --- gcc/cgraph.cc.jj 2022-04-20 09:24:12.194579146 +0200
> > > +++ gcc/cgraph.cc 2022-04-27 11:53:52.102173154 +0200
> > > @@ -3488,7 +3488,9 @@ cgraph_node::verify_node (void)
> > > "returns a pointer");
> > > error_found = true;
> > > }
> > > - if (definition && externally_visible
> > > + if (definition
> > > + && externally_visible
> > > + && (!alias || thunk || !in_lto_p)
> >
> > The alias check seems OK to me.
> > Why we need thunk? Here thunk may eventually gain a gimple body and we
> > will be interested in its opt_for_fn flags. So if we do not set
> > DECL_FUNCTION_SPECIFIC_OPTIMIZATION we may get unexpected surprises
> > (such as blocked inlining).
>
> I've added || thunk because free_lang_data sets DECL_FUNCTION_SPECIFIC_OPTIMIZATION
> for thunks, the guarding condition is:
> if (gimple_has_body_p (decl) || (node && node->thunk))
> I wasn't sure if node->alias and node->thunk can be both set or not.
> If they can't, I can take it out.
Aha, I misread is as !alias || !thunk.
But node can not be both alias and thunk, so I would leave it out.
Honza
>
> Jakub
>
prev parent reply other threads:[~2022-04-28 12:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-28 5:46 Jakub Jelinek
2022-04-28 7:27 ` Richard Biener
2022-04-28 11:54 ` Jan Hubicka
2022-04-28 11:57 ` Jakub Jelinek
2022-04-28 12:00 ` Jan Hubicka [this message]
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