From: Andi Kleen <andi@firstfloor.org>
To: Mark Mitchell <mark@codesourcery.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
gcc-patches@gcc.gnu.org, "H.J. Lu" <hjl.tools@gmail.com>,
"Fang\, Changpeng" <Changpeng.Fang@amd.com>,
"rguenther\@suse.de" <rguenther@suse.de>,
"sebpop\@gmail.com" <sebpop@gmail.com>,
Zdenek Dvorak <rakdver@kam.mff.cuni.cz>,
Maxim Kuvyrkov <maxim@codesourcery.com>
Subject: Re: [PATCH] Enabling Software Prefetching by Default at -O3
Date: Sun, 20 Jun 2010 04:29:00 -0000 [thread overview]
Message-ID: <87mxuqiy0b.fsf@basil.nowhere.org> (raw)
In-Reply-To: <4C1D2304.5080007@codesourcery.com> (Mark Mitchell's message of "Sat, 19 Jun 2010 13:05:24 -0700")
Mark Mitchell <mark@codesourcery.com> writes:
>
> Yes, that might be a good idea for i7.
>
> But, in the meantime, I think we should get a version of the patch that
> turns on prefetching on AMD CPUs with -O3. There's no reason to demand
> consistency for all CPUs and it clearly benefits the AMD CPUs.
> Changpeng, would you please submit a patch that activates this
> optimization only with tuning for AMD CPUs?
On i7 it will be likely still a win if hardware prefetch is disabled
in the BIOS. Most BIOS have a setting like this.
Unfortunately this cannot be easily detected by a program.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2010-06-19 20:11 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-15 22:21 Fang, Changpeng
2010-06-15 22:24 ` H.J. Lu
2010-06-15 22:28 ` Fang, Changpeng
2010-06-15 22:44 ` H.J. Lu
2010-06-15 22:47 ` Fang, Changpeng
2010-06-15 23:42 ` Mark Mitchell
2010-06-16 0:30 ` H.J. Lu
2010-06-16 3:43 ` Mark Mitchell
2010-06-18 8:51 ` Christian Borntraeger
2010-06-18 18:00 ` Fang, Changpeng
2010-06-19 0:30 ` H.J. Lu
2010-06-20 0:11 ` Christian Borntraeger
2010-06-20 2:34 ` Mark Mitchell
2010-06-20 4:29 ` Andi Kleen [this message]
2010-06-22 23:40 ` Fang, Changpeng
2010-06-23 6:21 ` Christian Borntraeger
2010-06-23 9:26 ` Richard Guenther
2010-06-23 12:02 ` Joseph S. Myers
2010-06-23 12:30 ` Christian Borntraeger
2010-06-23 13:13 ` Manuel López-Ibáñez
2010-06-24 23:37 ` Fang, Changpeng
2010-06-25 11:48 ` Richard Guenther
2010-06-25 20:16 ` Sebastian Pop
2010-06-26 17:01 ` Richard Guenther
2010-06-26 17:30 ` Richard Guenther
2010-06-26 17:38 ` Jan Hubicka
2010-06-26 18:23 ` Jan Hubicka
2010-06-25 12:29 ` Christian Borntraeger
2010-07-02 12:46 ` [PATCH] Enabling Software Prefetching by Default@-O3 Ulrich Weigand
2010-06-18 9:13 ` [PATCH] Enabling Software Prefetching by Default at -O3 Andreas Krebbel
2010-06-18 9:26 ` Andreas Krebbel
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