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Re: [PATCH] powerpc64: strrchr optimization for power8

From: Rajalakshmi Srinivasaraghavan <raji at linux dot vnet dot ibm dot com>
To: libc-alpha at sourceware dot org
Date: Mon, 20 Feb 2017 21:31:19 +0530
Subject: Re: [PATCH] powerpc64: strrchr optimization for power8
Authentication-results: sourceware.org; auth=none
References: <1487070321-27700-1-git-send-email-raji@linux.vnet.ibm.com> <52479e2b-f675-9d6e-7b34-27e24ee48081@redhat.com>



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.


--
Thanks
Rajalakshmi S

Follow-Ups:
- Re: [PATCH] powerpc64: strrchr optimization for power8
  - From: Carlos O'Donell

References:
- [PATCH] powerpc64: strrchr optimization for power8
  - From: Rajalakshmi Srinivasaraghavan
- Re: [PATCH] powerpc64: strrchr optimization for power8
  - From: Carlos O'Donell

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