RFR: 8287697: Limit auto vectorization to 32-byte vector on Cascade Lake [v2]

[Vladimir Kozlov]

On Thu, 2 Jun 2022 17:44:54 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>>> Hi @sviswa7 , #7806 implemented an interface for auto-vectorization to disable some unprofitable cases on aarch64. Can it also be applied to your case?
>> 
>> Maybe. But it would require more careful changes. And that changeset is not integrated yet.
>> Current changes are clean and serve their purpose good.
>> 
>> And, as Jatin and Sandhya said, we may do proper fix after JDK 19 fork. Then we can look on your proposal.
>
> @vnkozlov @jatin-bhateja Your review comments are implemented. Please take a look.

@sviswa7, please, file separate RFE for SPECjvm2008-SOR.small issue (different unrolling factor).

I got all performance data from our and yours data and I think these change are ready for integration. Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/8877