linux-kernel - Re: -Os versus -O2

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Message-ID: <467F1ADE.10803@gmail.com>
Date:	Mon, 25 Jun 2007 03:31:10 +0200
From:	Rene Herman <rene.herman@...il.com>
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

On 06/25/2007 03:23 AM, Rene Herman wrote:

> On 06/25/2007 02:41 AM, Adrian Bunk wrote:
> 
>> The interesting questions are:
>> Does -Os still sometimes generate faster code with gcc 4.2?
>> If yes, why?
> 
> I would wager that the CPU type makes more of a difference than the 
> compiler version. That is, I'd expect my Duron with it's "puny" 64K L1 
> to have a very different profile than it's Athlon brother with 256K L1.

Sorry, that should've been L2. And "its" ...

  > Not to mention CPUs with as little as 8K L1 (P1).
> 
> I can't quote numbers -- it's a bit hard to test those things anyway as 
> it's a system-global effect and not su much that's easily isolated in a 
> dedicated benchmark.

And while I'm at it, "and not so much one that's [ ...]".

Rene.
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