[PATCH] powerpc64: strrchr optimization for power8

[Rajalakshmi Srinivasaraghavan]

On 03/17/2017 09:08 PM, Carlos O'Donell wrote:
> Knowing the mean value of string lengths would let us decide where
> to place most of optimization efforts. I don't know that we have any
> good references to academic literature here.
>
No, I dont have details about strrchr call statistics. This
optimization is to make use of POWER 8 capabilties in general.

> Now I plotted the power8 performance and there is a big bump in the middle,
> any idea why?

I could see some sudden increase for sizes 104-118 and around 222
in the shared sheet. However there is no special logic in the code
related to these sizes. I tried to check if this happens on my
test P8 ppc64le system and I could not recreate this.
-- 
Thanks
Rajalakshmi S