RFR: 8288047: Accelerate Poly1305 on x86_64 using AVX512 instructions [v16]

[Volodymyr Paprotski]

On Tue, 15 Nov 2022 00:45:54 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> library_call.cpp takes care of that, it passes the address of 0'th element to the stub.
>
> Ah, got it. Worth elaborating that in the comments. Otherwise, they confuse rather than help:
> 
>   // void processBlocks(byte[] input, int len, int[5] a, int[5] r)
>   const Register input        = rdi; //input+offset
>   const Register length       = rbx;
>   const Register accumulator  = rcx;
>   const Register R            = r8;

Added a comment, hopefully less confusing.

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PR: https://git.openjdk.org/jdk/pull/10582