RFR: 8145717: Use AVX3 instructions for Arrays.equals() intrinsic

[Civlin, Jan]

Thank you, Vladimir.

-----Original Message-----
From: Vladimir Kozlov [mailto:vladimir.kozlov at oracle.com] 
Sent: Friday, December 18, 2015 11:16 AM
To: Civlin, Jan <jan.civlin at intel.com>; hotspot compiler <hotspot-compiler-dev at openjdk.java.net>
Subject: Re: RFR: 8145717: Use AVX3 instructions for Arrays.equals() intrinsic

Looks good. I will sponsor it.

Thanks,
Vladimir

On 12/17/15 8:03 PM, Civlin, Jan wrote:
> We would like to contribute AVX3 patch for Arrays.equals() intrinsic.
>
> This utilizes 512 bits registers on AVX3 architecture and delivers performance gain (speed-up):
> - on a random (any size) about 10% speed-up;
> - on a long (equal or not - randomly) about 25%;
> - on a long equal (it is the longest processing, since all the bytes matter) almost 40% - test time dropped from 12 sec to 7.5 sec.
>
>
> Contributor: Jan Civlin.
>
>
> Bug-id: https://bugs.openjdk.java.net/browse/JDK-8145717
> Webrev:  http://cr.openjdk.java.net/~kvn/8145717/webrev/
>