From: Maxim Kuvyrkov <maxim@codesourcery.com>
To: Steve Ellcey <sellcey@mips.com>
Cc: Andrew T Pinski <pinskia@gmail.com>,
"Joseph S. Myers" <joseph@codesourcery.com>,
<libc-ports@sourceware.org>
Subject: Re: [PATCH] Optimize MIPS memcpy
Date: Fri, 28 Sep 2012 03:48:00 -0000 [thread overview]
Message-ID: <25105334-8813-4532-AC0E-B3A44BE69A19@codesourcery.com> (raw)
In-Reply-To: <1348166309.6170.55.camel@ubuntu-sellcey>
On 21/09/2012, at 6:38 AM, Steve Ellcey wrote:
> On Thu, 2012-09-20 at 21:05 +1200, Maxim Kuvyrkov wrote:
>
>> What testing was done for this patch, does it pass glibc testsuite?
>>
>> I have a benchmark that exercises various string and mem* routines failing with it.
>>
>> Thank you,
>>
>> --
>> Maxim Kuvyrkov
>> CodeSourcery / Mentor Graphics
>
> Is the benchmark anything you can share? I ran the glibc testsuite and
> got some failures but I don't think they are due to the new memcpy. I
> am going back now and running the glibc testsuite with no changes to get
> a baseline so I can verify that. Hopefully I will have an answer later
> today.
>
> I ran some other tests like the gcc testsuite using a glibc with this
> change in it and that didn't have any problems and there is the one I
> sent to the list
> http://sourceware.org/ml/libc-ports/2012-09/msg00007.html that also ran
> with no problems.
As I mentioned in a different email, I can't share the benchmark, but I think I've got a testcase of sorts for you to investigate. It appears your memcpy clobbers a couple of bytes just before DEST in certain cases.
In particular when ABI=N32, DEST=0x10060008, SRC=0x1002c088, N=0x172 it clobbers DEST[-1] and DEST[-2] bytes.
--
Maxim Kuvyrkov
CodeSourcery / Mentor Graphics
next prev parent reply other threads:[~2012-09-28 3:48 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 [this message]
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
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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