From: boojin.kim@samsung.com (Boojin Kim)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] ARM: lib: use LDRD/STRD for data copy
Date: Wed, 28 Mar 2012 13:10:55 +0900 [thread overview]
Message-ID: <014e01cd0c98$c5e899d0$51b9cd70$%kim@samsung.com> (raw)
In-Reply-To: <012d01cd0c78$7d2f19a0$778d4ce0$%kim@samsung.com>
Boojin Kim wrote:
> > Cc: linux-arm-kernel at lists.infradead.org; 'Catalin Marinas'; 'Nicolas Pitre';
> > kgene.kim at samsung.com
> > Subject: Re: [PATCH 2/2] ARM: lib: use LDRD/STRD for data copy
> >
> > On Tue, Mar 27, 2012 at 09:27:52AM +0900, Boojin Kim wrote:
> > > This patch uses LDRD/STRD that loads and stores data as DWORD unit.
> > > It brings better performance than LDRM/STRM with cortex-a15.
> >
> > Why should I bother looking at this rubbish? You've been told before
> > that using ldrd and strd unconditionally is not acceptable. Stop
> > wasting peoples review time.
> This patch brings better memcpy results on Cortex-a15.
Additionally, Following is ARM's memcpy implementation that mentions LDRD/STRD is better for cortex-a15.
http://sourceware.org/ml/newlib/2011/msg00469.html
I'm tring to optimize memcpy for cortex-a15 because it's seems to be worth.
Thank you..
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
prev parent reply other threads:[~2012-03-28 4:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-19 7:02 [PATCH] ARM: lib: use LDRD/STRD for data copy Boojin Kim
2012-03-19 8:55 ` Russell King - ARM Linux
2012-03-19 14:36 ` Rob Herring
2012-03-19 15:41 ` Russell King - ARM Linux
2012-03-19 16:34 ` Måns Rullgård
2012-03-19 16:36 ` Rob Herring
2012-03-19 16:53 ` Nicolas Pitre
2012-03-19 17:11 ` Måns Rullgård
2012-03-19 20:11 ` Michael Hope
2012-03-20 0:21 ` Boojin Kim
2012-03-19 14:10 ` Nicolas Pitre
2012-03-20 0:05 ` Boojin Kim
2012-03-27 0:26 ` [PATCH 1/2] ARM: lib: Add optimized memcpy with 64 byte pld size Boojin Kim
2012-03-27 2:35 ` Nicolas Pitre
2012-03-28 0:28 ` Boojin Kim
2012-03-28 5:23 ` Nicolas Pitre
2012-03-29 4:00 ` [PATCH 0/4] memcpy optimized with strd/ldrd Nicolas Pitre
2012-03-29 4:00 ` [PATCH 1/4] ARM: copy_template.S: move some registers around Nicolas Pitre
2012-03-29 4:00 ` [PATCH 2/4] ARM: copy_template.S: rework the unaligned copy loop Nicolas Pitre
2012-03-29 4:00 ` [PATCH 3/4] ARM: copy_template.S: enforce contigous register set with memory accessors Nicolas Pitre
2012-03-29 4:00 ` [PATCH 4/4] ARM: option to select LDRD/STRD optimized memory copy Nicolas Pitre
2012-03-27 0:27 ` [PATCH 2/2] ARM: lib: use LDRD/STRD for data copy Boojin Kim
2012-03-27 7:40 ` Russell King - ARM Linux
2012-03-28 0:19 ` Boojin Kim
2012-03-28 4:10 ` Boojin Kim [this message]
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