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

[Nils Eliasson]

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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