RFR: 8341527: AVX-512 intrinsic for SHA3 [v4]

[Ferenc Rakoczi]

On Wed, 16 Oct 2024 21:30:37 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Actually, I was hoping that I would learn that from a reviewer @vpaprotsk or @vnkozlov , do you know? I was not able to figure it out from the manual what it should be. (with the current setting "false" at least my code works on the test machines that I tried, but I never tried with "true")
>
> legacy_mode should be false here. This instruction is promotable to evex encoding if higher bank registers (XMM16 and above) are used. It is not a legacy instruction so legacy_mode should be false. Examples of legacy instructions are vptest, vpblend*.

Thank you!

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PR Review Comment: https://git.openjdk.org/jdk/pull/21352#discussion_r1804305362