RFR (M): 8143355: Update for addition of vectorizedMismatch intrinsic for x86

[Deshpande, Vivek R]

Hi Vladimir

Yes the 2x performance gain is using AVX2 instructions for big arrays(~1k).
We will update the patch and jbs entry with global flag and let you know soon.

Regards,
Vivek


-----Original Message-----
From: Vladimir Kozlov [mailto:vladimir.kozlov at oracle.com] 
Sent: Tuesday, December 01, 2015 6:02 PM
To: Deshpande, Vivek R; hotspot compiler
Cc: Yi, Liqi; Viswanathan, Sandhya; Kaczmarek, Eric
Subject: Re: RFR (M): 8143355: Update for addition of vectorizedMismatch intrinsic for x86

    2) improving C1 (perhaps even the interpreter?) since the intrinsic is a stub which IIUC makes it easier to plug in.

If that is the case the flag should be global.

Thanks,
Vladimir

On 12/1/15 5:48 PM, Vladimir Kozlov wrote:
> This seems fine. 2x is for AVX implementation?
>
> Thanks,
> Vladimir
>
> On 11/24/15 4:00 PM, Deshpande, Vivek R wrote:
>> Hi all
>>
>> We would like to contribute a patch from Intel which optimizes
>> vectorizedMismatch() method in java.util.ArraysSupport.java for X86 
>> architecture using AVX instructions.
>>
>> The improvement gives more than 2x gain over Unsafe implementation 
>> for long arrays.
>>
>>
>>   The bug is blocked by bug: vectorized support for array
>>   equals/compare/mismatch using Unsafe
>>   (https://bugs.openjdk.java.net/browse/JDK-8136924.)
>>
>> Could you please review and sponsor this patch.
>>
>> Bug-id:
>>
>> https://bugs.openjdk.java.net/browse/JDK-8143355
>> webrev:
>>
>> http://cr.openjdk.java.net/~mcberg/8143355/webrev.01/
>>
>> Thanks and regards,
>>
>> Vivek
>>