> This provides AVX2 intrinsics for MLKEM operations. I also refactored AVX512 
> for code sharing. (A lot of this is similar to the MLDSA refactoring I did, 
> and general shape follows that design)
> 
> Performance:
> - KEMBench.MLKEM.(en|de)capsulate on AVX2 got 50-80% faster (depending on 
> keysize and operation)
> - On AVX512, the intrinsics themselves were ~10-30% faster, but it doesnt 
> really show on the top-level KEMBench.MLKEM.(en|de)capsulate (other parts of 
> the benchmark take over, eg SHA3 which we optimized previously)
> 
> ---------
> - [X] I confirm that I make this contribution in accordance with the [OpenJDK 
> Interim AI Policy](https://openjdk.org/legal/ai).

Volodymyr Paprotski has updated the pull request with a new target base due to 
a merge or a rebase. The pull request now contains eight commits:

 - re-enable test
 - Merge remote-tracking branch 'origin/master' into avx2-mlkem
 - whitespace
 - reduce fuzz test repetition
 - Merge remote-tracking branch 'origin/master' into avx2-mlkem
 - prepare for rebase
 - comments from Anas
 - avx2 mlkem drop

-------------

Changes: https://git.openjdk.org/jdk/pull/33444/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33444&range=01
  Stats: 1570 lines in 5 files changed: 1001 ins; 239 del; 330 mod
  Patch: https://git.openjdk.org/jdk/pull/33444.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/33444/head:pull/33444

PR: https://git.openjdk.org/jdk/pull/33444

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