RFR: 8247645: ChaCha20 intrinsics

[Jamil Nimeh]

On Fri, 21 Oct 2022 12:29:22 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> This PR delivers ChaCha20 intrinsics that accelerate the core block function that generates key stream from the key, counter and nonce.  Intrinsics have been written for the following platforms and instruction sets:
>> 
>> - x86_64: AVX, AVX2 and AVX512
>> - aarch64: platforms that support the advanced SIMD instructions
>> 
>> Note: Microbenchmark results moved to a comment in the PR so we don't have to see it in every email.
>> 
>> Special thanks to the folks who have made many helpful comments while this PR was in draft form.
>
> Please my friend, let's get this finished or I'm going to have to do it myself.

Hi @theRealAph, since I have the green light on the x86 side I was wondering if I could get your blessing on the aarch64 side of the house or if you have any other concerns.

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