RFR (M): 8154974: AVX-512 equipped inflate, has_negatives & compress intrinsics

Wojtowicz, Tomasz tomasz.wojtowicz at intel.com
Wed May 4 23:12:13 UTC 2016

Internally developed ubenchmarks for performance & similar functional using Reflections API for those 3 intrinsics on an up to 4K chunks of pseudo random initialized data to verify correctness.
Has_negatives had a negative sentinel as a last element in an array.
Also tailored examples for compress which would test all of the possible entry scenarios (tail present/not present, non-compressable element found in head OR tail - to make sure that there is a coverage for all of the basic blocks inside intrinsic)

Everything run at least 3 times for -XX:UseAVX=1 then 2 and 3, depending on a scenario for establishing performance baseline AND/OR correctness when "older"(AVX<=2) had been modified.


-----Original Message-----
From: Vladimir Kozlov [mailto:vladimir.kozlov at oracle.com] 
Sent: Wednesday, May 4, 2016 3:58 PM
To: Wojtowicz, Tomasz <tomasz.wojtowicz at intel.com>; hotspot-compiler-dev at openjdk.java.net
Subject: Re: RFR (M): 8154974: AVX-512 equipped inflate, has_negatives & compress intrinsics

Looks good. What testing was done?


On 4/29/16 4:57 PM, Wojtowicz, Tomasz wrote:
> I would like to contribute following change:
> Review details
> Review Title:      AVX-512 equipped inflate, has_negatives & compress
> intrinsics
> Review ID:          #8154974
> Diff: http://cr.openjdk.java.net/~vdeshpande/8154974/webrev.00/
> Description:        512 bit wide upgrades for previously 128-256 wide
> implementations using mask registers for tail computations.
> Link: https://bugs.openjdk.java.net/browse/JDK-8154974
> Author:                Tomasz, Wojtowicz
> --
> Thank you,
> Tomek

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