From: Maxim Kuvyrkov <maxim@codesourcery.com>
To: Andrew Pinski <pinskia@gmail.com>
Cc: Steve Ellcey <sellcey@mips.com>,
"Joseph S. Myers" <joseph@codesourcery.com>,
<libc-ports@sourceware.org>
Subject: Re: [PATCH] Optimize MIPS memcpy
Date: Tue, 30 Oct 2012 07:19:00 -0000 [thread overview]
Message-ID: <6F4D4D04-7C0D-47FD-B066-08E3FD2D4F6C@codesourcery.com> (raw)
In-Reply-To: <0CA30903-22E1-47EF-BA7F-9A82E5DC8961@codesourcery.com>
On 30/10/2012, at 8:16 PM, Maxim Kuvyrkov wrote:
> On 30/10/2012, at 7:00 AM, Steve Ellcey wrote:
>
>> On Wed, 2012-10-17 at 10:29 -0700, Steve Ellcey wrote:
>>
>>> OK, Here is a version of memcpy that uses the STORE_STREAMING prefetch.
>>> While it is optimized for a 32 byte prefetch, it will work correctly
>>> regardless of the size of the prefetch.
>>>
>>> Is this version OK to checkin?
>>>
>>> Steve Ellcey
>>> sellcey@mips.com
>>
>> Maxim, have you had a chance to test this version of memcpy for MIPS?
>
> I have tested your latest version. Good news: there are no correctness issues. Bad news: it underperforms compared to my patch by 2-3 times on both N32 and N64 (didn't test O32) on the benchmark that I used. I've run the benchmark several times and results are consistent. I use oprofile on libc.so to determine how much time is spent in memcpy.
>
> Would you please confirm that your current implementation is faster on YOUR benchmark than my patch in http://sourceware.org/ml/libc-ports/2012-09/msg00000.html ? Please make sure that PREFETCH macro in ports/sysdeps/mips/sys/asm.h gets defined to "pref", not "nop", in your build.
Andrew,
You should also have a stake in this. Would you please benchmark Steve's patch in http://sourceware.org/ml/libc-ports/2012-10/msg00037.html vs my patch in http://sourceware.org/ml/libc-ports/2012-09/msg00000.html on your favorite benchmark and report the results?
Thank you,
--
Maxim Kuvyrkov
CodeSourcery / Mentor Graphics
next prev parent reply other threads:[~2012-10-30 7:19 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-01 6:16 Maxim Kuvyrkov
2012-09-01 16:37 ` Joseph S. Myers
2012-09-03 9:12 ` Andrew T Pinski
2012-09-03 17:12 ` Maxim Kuvyrkov
2012-09-04 15:09 ` Steve Ellcey
2012-09-04 15:14 ` Carlos O'Donell
2012-09-04 17:03 ` Steve Ellcey
2012-09-04 17:28 ` Carlos O'Donell
2012-09-05 0:43 ` Maxim Kuvyrkov
2012-09-06 16:25 ` Steve Ellcey
2012-09-06 18:43 ` Roland McGrath
2012-09-06 19:37 ` Steve Ellcey
2012-09-07 21:24 ` Maxim Kuvyrkov
2012-09-11 4:35 ` Maxim Kuvyrkov
2012-09-11 15:18 ` Steve Ellcey
2012-09-20 9:05 ` Maxim Kuvyrkov
2012-09-20 18:38 ` Steve Ellcey
2012-09-28 3:48 ` Maxim Kuvyrkov
2012-10-06 4:43 ` Maxim Kuvyrkov
2012-10-08 17:04 ` Steve Ellcey
2012-10-08 22:31 ` Maxim Kuvyrkov
2012-10-09 20:50 ` Steve Ellcey
2012-10-15 17:49 ` Steve Ellcey
2012-10-15 20:20 ` Andrew Pinski
2012-10-15 20:34 ` Steve Ellcey
2012-10-15 20:42 ` Andrew Pinski
2012-10-15 20:50 ` Andrew Pinski
2012-10-15 21:36 ` Steve Ellcey
2012-10-15 21:47 ` Maxim Kuvyrkov
2012-10-17 17:30 ` Steve Ellcey
2012-10-29 18:00 ` Steve Ellcey
2012-10-29 18:03 ` Maxim Kuvyrkov
2012-10-30 7:16 ` Maxim Kuvyrkov
2012-10-30 7:19 ` Maxim Kuvyrkov [this message]
2012-10-30 17:46 ` Steve Ellcey
2012-10-30 21:56 ` Maxim Kuvyrkov
2012-10-30 22:19 ` Steve Ellcey
2012-12-19 1:51 ` Maxim Kuvyrkov
2012-12-19 16:59 ` Steve Ellcey
2012-10-31 19:27 ` Andreas Jaeger
2012-10-31 20:04 ` Steve Ellcey
2012-10-15 22:10 ` Joseph S. Myers
2012-10-15 21:29 ` Maciej W. Rozycki
2012-10-15 22:05 ` Maxim Kuvyrkov
2012-09-21 18:47 ` Steve Ellcey
2012-09-21 18:57 ` Joseph S. Myers
2012-09-21 20:41 ` [PATCH] Optimize MIPS memcpy (mips glibc test results) Steve Ellcey
2012-09-21 20:49 ` Joseph S. Myers
2012-09-21 20:56 ` Steve Ellcey
2012-09-21 19:12 ` [PATCH] Optimize MIPS memcpy Maxim Kuvyrkov
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