From: Jan Hubicka <hubicka@ucw.cz>
To: Steven Bosscher <stevenb@suse.de>
Cc: Giovanni Bajo <giovannibajo@libero.it>, gcc@gcc.gnu.org
Subject: Re: GCC 3.5 Status (2004-08-29)
Date: Mon, 30 Aug 2004 16:34:00 -0000 [thread overview]
Message-ID: <20040830151240.GD22834@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <200408301217.06743.stevenb@suse.de>
> On Monday 30 August 2004 12:04, Giovanni Bajo wrote:
> > Thanks for the update. Do you think it is feasable to have a special
> > version of DCE/CCP (or a special flag in them) so that they don't destroy
> > user variables, to be used at -O0?
>
> We discussed that, yes. You could look into how CCP propagates
> things like addresses and so on, and figure out other things that
> cause us to lose the user's variable.
> DCE is not a real problem. If CCP would just not turn so many
> statements into dead code, it would work ;-)
I think all we need is to avoid CCP on user variables so user can change
their value and DCE killing whole statements so user can breakpoint.
Perhaps we can even consider idea of passing down the NOPs for
statements that have completely no effect. This should be embeddable
into existing CCP/DCE code... perhaps ;)
Honza
>
> Gr.
> Steven
>
next prev parent reply other threads:[~2004-08-30 15:12 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-29 23:49 Mark Mitchell
2004-08-30 0:03 ` Andrew Pinski
2004-08-30 0:33 ` Mark Mitchell
2004-08-30 0:53 ` Daniel Berlin
2004-08-30 0:25 ` Steven Bosscher
2004-08-30 0:48 ` Mark Mitchell
2004-08-30 0:57 ` Steven Bosscher
2004-08-30 1:04 ` Mark Mitchell
2004-08-30 1:12 ` Andrew Pinski
2004-08-30 1:29 ` Mark Mitchell
2004-08-30 10:11 ` Joseph S. Myers
2004-08-30 2:46 ` Giovanni Bajo
2004-08-30 3:09 ` Matt Austern
2004-08-30 13:51 ` Speeding up C++ at -O0 (Was: GCC 3.5 Status (2004-08-29)) Giovanni Bajo
2004-08-30 18:02 ` GCC 3.5 Status (2004-08-29) Joe Buck
2004-08-30 3:32 ` Gabriel Dos Reis
2004-08-30 4:11 ` Mark Mitchell
2004-08-30 4:17 ` Gabriel Dos Reis
2004-08-30 4:43 ` Mark Mitchell
2004-08-30 5:09 ` Gabriel Dos Reis
2004-08-30 5:27 ` Mark Mitchell
2004-08-30 5:30 ` Gabriel Dos Reis
2004-08-30 6:57 ` Mark Mitchell
2004-08-30 9:24 ` Steven Bosscher
2004-08-30 10:13 ` Giovanni Bajo
2004-08-30 10:26 ` Steven Bosscher
2004-08-30 16:34 ` Jan Hubicka [this message]
2004-08-30 11:02 ` Paolo Bonzini
2004-08-30 10:03 ` Steven Bosscher
2004-08-30 15:11 ` Mark Mitchell
2004-08-30 15:21 ` Jan Hubicka
2004-08-30 17:46 ` Jeffrey A Law
2004-08-30 1:09 ` Daniel Berlin
2004-08-30 1:53 ` Mark Mitchell
2004-08-30 7:34 ` Steven Bosscher
2004-08-30 8:15 ` Mark Mitchell
2004-08-30 14:16 ` Daniel Berlin
2004-08-30 15:10 ` Mark Mitchell
2004-08-30 3:03 ` Daniel Berlin
2004-08-30 3:20 ` Mark Mitchell
2004-08-31 17:35 ` Joseph S. Myers
2004-08-30 10:50 ` Dorit Naishlos
2004-08-30 15:12 ` Mark Mitchell
2004-08-30 14:26 ` Jan Hubicka
2004-08-30 15:03 ` Mark Mitchell
2004-08-30 15:05 ` Jan Hubicka
2004-08-30 17:08 ` Diego Novillo
2004-08-31 3:25 ` Devang Patel
2004-08-30 0:59 Richard Kenner
2004-08-30 4:33 Nathanael Nerode
2004-08-30 10:17 Richard Kenner
2004-08-30 14:48 ` Mark Mitchell
2004-08-30 18:08 ` Mike Stump
2004-08-30 10:44 Richard Kenner
2004-08-30 11:27 ` Laurent GUERBY
2004-08-30 13:05 ` Jakub Jelinek
2004-08-30 18:28 ` Laurent GUERBY
2004-08-30 20:04 ` Jakub Jelinek
2004-08-30 20:25 ` Laurent GUERBY
2004-08-31 5:27 ` Eric Botcazou
2004-08-31 9:42 ` Arnaud Charlet
2004-08-30 20:14 ` Florian Weimer
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