Re: [PATCH] powerpc64: strrchr optimization for power8

[Rajalakshmi Srinivasaraghavan <raji at linux dot vnet dot ibm dot com>]

On 02/28/2017 01:02 PM, Rajalakshmi Srinivasaraghavan wrote:
> 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

Carlos,

Do you have further comments?

--
Thanks
Rajalakshmi S