RFR: 8247645: ChaCha20 intrinsics [v3]

[Nick Gasson]

On Thu, 17 Nov 2022 18:50:48 GMT, Jamil Nimeh <jnimeh at openjdk.org> wrote:

>> Jamil Nimeh has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   replace hi/lo word shuffles and left-right shift/or operations for vpshufd on byte-aligned rotations
>
> Another pair of arm-knowledgeable eyes on this is always welcome!

AArch64 code looks OK to me, and I believe @jnimeh already discussed the implementation with one of my colleagues who works on crypto optimisation at Arm.

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PR: https://git.openjdk.org/jdk/pull/7702