From: Rene Herman <rene.herman@gmail.com>
To: david@lang.hm
Cc: Arjan van de Ven <arjan@infradead.org>,
Adrian Bunk <bunk@stusta.de>, Benjamin LaHaise <bcrl@kvack.org>,
Oleg Verych <olecom@flower.upol.cz>, rae l <crquan@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: -Os versus -O2
Date: Mon, 25 Jun 2007 03:41:08 +0200 [thread overview]
Message-ID: <467F1D34.5080807@gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0706241824080.10397@asgard.lang.hm>
On 06/25/2007 03:33 AM, david@lang.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.
next prev parent reply other threads:[~2007-06-25 1:44 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-23 5:15 [PATCH] trivial: the memset operation on a automatic array variable should be optimized out by data initialization Denis Cheng
2007-06-23 7:59 ` Oleg Verych
2007-06-23 13:13 ` Adrian Bunk
2007-06-23 13:41 ` Oleg Verych
2007-06-23 13:57 ` Adrian Bunk
2007-06-23 15:21 ` Segher Boessenkool
2007-06-24 12:58 ` rae l
2007-06-24 22:25 ` Oleg Verych
2007-06-24 22:15 ` Arjan van de Ven
2007-06-24 23:23 ` Benjamin LaHaise
2007-06-25 0:09 ` Arjan van de Ven
2007-06-25 0:12 ` Benjamin LaHaise
2007-06-25 0:23 ` Arjan van de Ven
2007-06-25 0:41 ` -Os versus -O2 Adrian Bunk
2007-06-25 0:58 ` Arjan van de Ven
2007-06-25 1:08 ` david
2007-06-25 1:17 ` Arjan van de Ven
2007-06-25 1:33 ` david
2007-06-25 1:41 ` Rene Herman [this message]
2007-06-25 5:04 ` Willy Tarreau
2007-06-25 7:08 ` Segher Boessenkool
2007-06-25 7:15 ` david
2007-06-25 7:41 ` Segher Boessenkool
2007-06-25 8:19 ` Willy Tarreau
2007-06-25 8:41 ` Segher Boessenkool
2007-06-25 7:03 ` Segher Boessenkool
2007-06-25 7:13 ` david
2007-06-25 7:35 ` Segher Boessenkool
2007-06-25 1:33 ` Adrian Bunk
2007-06-25 1:23 ` Rene Herman
2007-06-25 1:31 ` Rene Herman
2007-06-25 1:34 ` Jeff Garzik
2007-06-25 1:46 ` Adrian Bunk
2007-06-25 2:19 ` david
2007-06-24 23:33 ` memset() with zeroes (Re: [PATCH] trivial: the memset operation on a automatic array variable should be optimized out by data initialization) Oleg Verych
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