linux-kernel - Re: -Os versus -O2

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Date:	Mon, 25 Jun 2007 03:41:08 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	david@...g.hm
CC:	Arjan van de Ven <arjan@...radead.org>,
	Adrian Bunk <bunk@...sta.de>,
	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

On 06/25/2007 03:33 AM, david@...g.hm wrote:

> is the list of what's included in -O2 vs -Os different for different 
> CPU's? what about within a single family of processors? (even in the x86 
> family the costs of jumps, loops, and cache misses varies drasticly)

At least not in the example Duron/Athlon case. Both -march=athlon{,-4) but 
64K versus 256K L2 which I'd expect to be an important difference in the -Os 
versus -O2 behaviour.

Rene.
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