linux-kernel - Re: -Os versus -O2

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Message-ID: <467F1B8D.3080507@garzik.org>
Date:	Sun, 24 Jun 2007 21:34:05 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Adrian Bunk <bunk@...sta.de>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Oleg Verych <olecom@...wer.upol.cz>, rae l <crquan@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: -Os versus -O2

Adrian Bunk wrote:
> The interesting questions are:
> Does -Os still sometimes generate faster code with gcc 4.2?
> If yes, why?

Smaller code can mean fewer page faults, fewer cache invalidations, etc.

It's not just a matter of compiler code generation, gotta look at the 
whole picture.

	Jeff


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