From: Willy Tarreau <w@1wt.eu>
To: Alexander van Heukelum <heukelum@fastmail.fm>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Alexander van Heukelum <heukelum@mailshack.com>,
Ingo Molnar <mingo@elte.hu>, Andi Kleen <andi@firstfloor.org>,
Jeremy Fitzhardinge <jeremy@goop.org>,
Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: K8, EFFICEON and CORE2 support the cmovxx instructions.
Date: Sat, 15 Mar 2008 22:11:25 +0100 [thread overview]
Message-ID: <20080315211125.GB13012@1wt.eu> (raw)
In-Reply-To: <1205615192.29139.1242596503@webmail.messagingengine.com>
On Sat, Mar 15, 2008 at 10:06:32PM +0100, Alexander van Heukelum wrote:
> > > I'm quite sure that K8, EFFICEON and CORE2 support HAVE_CMOV, but
> > > they did not set X86_CMOV.
> > >
> >
> > Crusoe has CMOV as well.
So does GEODE_LX BTW
> I believe you... and the Makefile_32.cpu: it gets a -march=i686. I
> also found out that I missed X86_ELAN, which is treated as a i486.
>
> Also, MGEODE_LX does not get any optimization flags. I think that
> is unintentional, but what should they be?
in my experience (on user-space code), optimizing for "i586" gives
good results. However, the cache is small, so everything which can
reduce code size (especially loop/jump/function alignment) is worth
checking.
Regards,
Willy
next prev parent reply other threads:[~2008-03-15 21:12 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-12 20:01 [PATCH] x86: merge the simple bitops and move them to bitops.h Alexander van Heukelum
2008-03-14 18:07 ` Jeremy Fitzhardinge
2008-03-14 19:43 ` Alexander van Heukelum
2008-03-14 19:55 ` Andi Kleen
2008-03-14 21:33 ` Alexander van Heukelum
2008-03-14 21:42 ` Andi Kleen
2008-03-14 22:01 ` Alexander van Heukelum
2008-03-14 22:18 ` Andi Kleen
2008-03-15 17:54 ` Alexander van Heukelum
2008-03-15 19:19 ` K8, EFFICEON and CORE2 support the cmovxx instructions Alexander van Heukelum
2008-03-15 20:18 ` H. Peter Anvin
2008-03-15 21:06 ` Alexander van Heukelum
2008-03-15 21:11 ` Willy Tarreau [this message]
2008-03-16 13:16 ` [PATCH] x86: K8, GEODE_LX, CRUSOE, " Alexander van Heukelum
2008-03-21 12:38 ` Ingo Molnar
2008-03-14 20:35 ` [PATCH v2] x86: merge the simple bitops and move them to bitops.h Alexander van Heukelum
2008-03-14 23:30 ` Randy Dunlap
2008-03-15 12:04 ` [PATCH v3] " Alexander van Heukelum
2008-03-21 12:35 ` Ingo Molnar
2008-03-14 21:15 ` [PATCH] " Jeremy Fitzhardinge
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