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From: Christoph Hellwig <hch@infradead.org>
To: Robert Love <rml@tech9.net>
Cc: Marcus Meissner <mm@ns.caldera.de>, linux-kernel@vger.kernel.org
Subject: Re: Compiling 2.2.19 with -O3 flag
Date: Fri, 24 May 2002 18:44:02 +0100	[thread overview]
Message-ID: <20020524184402.A24780@infradead.org> (raw)
In-Reply-To: <200205241645.g4OGjbE30934@ns.caldera.de> <1022259244.2638.243.camel@sinai>

On Fri, May 24, 2002 at 09:54:04AM -0700, Robert Love wrote:
> On Fri, 2002-05-24 at 09:45, Marcus Meissner wrote:
> 
> > > Heh, now that is interesting.
> > 
> > Not really, -Os implies -O2, cf gcc/toplev.c:
> 
> Well, according to Alan -Os outperforms -O2.  So either the code is
> smaller _and_ faster - and that is surely interesting - or the code is
> _not_ smaller and -Os is a misnomer.  Seems interesting to me.

-Os implies -O2 + additional size-reducing features:

[hch@sb hch]$ grep -r optimize_size /work/people/hch/gcc/gcc | wc -l
    250
[hch@sb hch]$

A bunch of matches are in ChangeLog and most are target-specific,
but I guess you got the point..


  reply	other threads:[~2002-05-24 17:44 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-05-24  6:51 Compiling 2.2.19 with -O3 flag samson swanson
2002-05-24 14:42 ` Alan Cox
2002-05-24 15:19   ` Robert Love
2002-05-24 15:44     ` Alan Cox
2002-05-24 16:45     ` Marcus Meissner
2002-05-24 16:54       ` Robert Love
2002-05-24 17:44         ` Christoph Hellwig [this message]
2002-05-24 17:55           ` Robert Love
2002-05-24 18:00             ` Christoph Hellwig

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