RFR(S)JDK-8214074: Ghash optimization using AVX instructions

[Florian Weimer]

* Smita Kamath:

> I'd like to contribute an optimization for GHASH Algorithm using AVX
> Instructions. I have tested this optimization on SKX x86_64 platform
> and it shows ~20-30% performance improvement for larger message sizes
> (for example 8k).

Performance improvement against what?  The pure Java implementation?  I
find this a bit surprising.  I would have expected a much larger
performance improvement from the use of CLMUL instructions.

Thanks,
Florian