From: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
To: libc-alpha@sourceware.org
Subject: Re: [PATCH] powerpc64: strrchr optimization for power8
Date: Tue, 28 Feb 2017 07:32:00 -0000 [thread overview]
Message-ID: <00958c35-0b2d-60c9-f618-cfcd185710e8@linux.vnet.ibm.com> (raw)
In-Reply-To: <139ea9b7-005d-fd33-a223-fe36fc995f4d@redhat.com>
On 02/20/2017 09:36 PM, Carlos O'Donell wrote:
> On 02/20/2017 11:01 AM, Rajalakshmi Srinivasaraghavan wrote:
>>
>>
>> On 02/20/2017 07:12 PM, Carlos O'Donell wrote:
>>> On 02/14/2017 06:05 AM, Rajalakshmi Srinivasaraghavan wrote:
>>>> P7 code is used for <=32B strings and for > 32B vectorized loops are used.
>>>> This shows as an average 25% improvement depending on the position of search
>>>> character. The performance is same for shorter strings.
>>>> Tested on ppc64 and ppc64le.
>>> What did you use to test the 25% improvement?
>>
>> This improvement is seen when compared to power7. Benchtest is
>> modified to use length from 0 to 400 to find the average for
>> different lengths.
>
> Could you post your modifications for review an explain your
> process in a little more detail. I'm curious about the changes
> you made.
Carlos,
Posted benchtest modification here:
https://sourceware.org/ml/libc-alpha/2017-02/msg00380.html
--
Thanks
Rajalakshmi S
next prev parent reply other threads:[~2017-02-28 7:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-14 11:06 Rajalakshmi Srinivasaraghavan
2017-02-20 13:10 ` Gabriel F. T. Gomes
2017-02-20 13:43 ` Carlos O'Donell
2017-02-20 16:01 ` Rajalakshmi Srinivasaraghavan
2017-02-20 16:06 ` Carlos O'Donell
2017-02-20 16:50 ` Rajalakshmi Srinivasaraghavan
2017-02-28 7:32 ` Rajalakshmi Srinivasaraghavan [this message]
2017-03-09 6:14 ` Rajalakshmi Srinivasaraghavan
2017-03-17 15:38 ` Carlos O'Donell
2017-03-20 8:39 ` Rajalakshmi Srinivasaraghavan
2017-03-20 16:34 ` Carlos O'Donell
2017-03-21 5:15 ` Rajalakshmi Srinivasaraghavan
2017-04-03 15:30 ` Tulio Magno Quites Machado Filho
2017-04-17 15:20 ` Carlos O'Donell
2017-02-21 17:02 ` Carlos Eduardo Seo
-- strict thread matches above, loose matches on Subject: below --
2017-02-09 5:01 Rajalakshmi Srinivasaraghavan
2017-02-09 15:26 ` Gabriel F. T. Gomes
2017-02-13 16:18 ` Peter Bergner
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