RFR(S): x86:8190934: Regressions on Haswell Xeon due to JDK-8178811

[Claes Redestad]

Hi,

not a review, but I've verified that this resolves a number of 
regressions we've seen in various microbenchmarks.

Thanks!

/Claes


On 2017-12-14 13:00, Nils Eliasson wrote:
>
> Hi Vivek,
>
> I have started regular testing of your patch. Hopefully the testing 
> will be complete when Vladimir comes online.
>
> Regards,
>
> Nils
>
>
> On 2017-12-14 08:22, Deshpande, Vivek R wrote:
>>
>> Hi Vladimir
>>
>> I have a fix for the slowdown observed on haswell due to jdk-8178811.
>>
>> The solution selectively generates vzeroupper when AVX2/ AVX512 
>> instructions have been executed and before the transition to SSE code.
>>
>> I tested this fix with the test case given with bug and SPECjbb2015.
>>
>> Could you please review and sponsor the patch?
>>
>> Webrev:
>>
>> http://cr.openjdk.java.net/~vdeshpande/8190934/webrev.00/ 
>> <http://cr.openjdk.java.net/%7Evdeshpande/8190934/webrev.00/>
>>
>> I have also updated the bug: 
>> https://bugs.openjdk.java.net/browse/JDK-8190934 
>> <https://bugs.openjdk.java.net/browse/JDK-8190934>
>>
>> Regards,
>>
>> Vivek
>>
>

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