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Re: [PATCH] powerpc64: strrchr optimization for power8
- From: "Tulio Magno Quites Machado Filho" <tuliom at linux dot vnet dot ibm dot com>
- To: "Carlos O'Donell" <carlos at redhat dot com>, Rajalakshmi Srinivasaraghavan <raji at linux dot vnet dot ibm dot com>, libc-alpha at sourceware dot org
- Cc:
- Date: Mon, 03 Apr 2017 12:29:51 -0300
- 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> <55dfbdb0-3776-caa9-e87b-10c297b4b496@linux.vnet.ibm.com> <139ea9b7-005d-fd33-a223-fe36fc995f4d@redhat.com> <00958c35-0b2d-60c9-f618-cfcd185710e8@linux.vnet.ibm.com> <5af3baaf-a340-cf07-10fc-f877d803dd6c@linux.vnet.ibm.com> <3e1454d4-ce03-f3a5-ac6f-6d9a7a0151f8@redhat.com>
Carlos O'Donell <carlos@redhat.com> writes:
> Now I plotted the power8 performance and there is a big bump in the middle,
> any idea why?
I remember that we discussed this on #glibc and you noticed the same behavior
on simple_strrchr and we agreed this could be raw hardware behavior.
Do you think this question is still blocking this patch?
--
Tulio Magno