From: Richard Biener <rguenther@suse.de>
To: Jan Hubicka <hubicka@ucw.cz>
Cc: gcc-patches@gcc.gnu.org, jason@redhat.com
Subject: Re: Teach vrp that THIS pointer and references are non-zero
Date: Mon, 13 Apr 2015 12:18:00 -0000 [thread overview]
Message-ID: <alpine.LSU.2.11.1504131418260.6786@zhemvz.fhfr.qr> (raw)
In-Reply-To: <20150413121730.GA11125@atrey.karlin.mff.cuni.cz>
On Mon, 13 Apr 2015, Jan Hubicka wrote:
> > On Mon, 13 Apr 2015, Jan Hubicka wrote:
> >
> > > Hi,
> > > with multiple inheritance compiling the testcase bellow, the first call always
> > > leads to call with offseted pointer, while the other call results in if
> > > conditoinal testing if parameter is non-NULL.
> > >
> > > This patch teach VRP that THIS pointers and references are non-zero. I hope
> > > this is true also for fortran and ada, but I think both languages do not really
> > > have NULL.
> > >
> > > I think VRP could basically assume all reference pointers to be non-zero, but
> > > I am not sure how to do that with GIMPLE useless conversion rules.
> > >
> > > Bootstrapped/regtested x86_64-linux, OK?
> >
> > Hmm - doesn't ESRA remove unused this eventually so this falls apart?
>
> It changes METHOD_TYPE to FUNCTION_TYPE then.
I see. Patch is ok then with Jakubs fixes.
Thanks,
Richard.
next prev parent reply other threads:[~2015-04-13 12:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-13 10:12 Jan Hubicka
2015-04-13 10:22 ` Jakub Jelinek
2015-04-13 11:48 ` Richard Biener
2015-04-13 12:17 ` Jan Hubicka
2015-04-13 12:18 ` Richard Biener [this message]
2015-04-15 13:07 ` Jason Merrill
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