RFR: 8360934: Add AVX-512 intrinsics for ML-KEM - enhancement on AVX512_VBMI [v3]

[Volodymyr Paprotski]

On Thu, 8 Jan 2026 00:24:11 GMT, Shawn M Emery <duke at openjdk.org> wrote:

>> This change allows use of the AVX512_VBMI instruction set to further optimize decompression/parsing of polynomial coefficients for ML-KEM.  The speedup gained in the ML-KEM benchmarks for key generation is between 0.3 to 0.6%, encapsulation is  0.4 to 1.7%, and decapsulation is 0.3 to 1.9%.
>> 
>> Thank you to @sviswa7 and @ferakocz for their help in working through the early stages of this code with me.
>
> Shawn M Emery has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8360934: Add AVX-512 intrinsics for ML-KEM - enhancement on AVX512_VBMI
>   Change Swap to Dup named function/variable
>   Check for only VBMI support (not VBMI2)

Looks good to me

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Marked as reviewed by vpaprotski (Committer).

PR Review: https://git.openjdk.org/jdk/pull/28815#pullrequestreview-3640216667