RFR: 8351034: Add AVX-512 intrinsics for ML-DSA [v11]

[Volodymyr Paprotski]

On Sat, 22 Mar 2025 20:02:31 GMT, Ferenc Rakoczi <duke at openjdk.org> wrote:

>> By using the AVX-512 vector registers the speed of the computation of the ML-DSA algorithms (key generation, document signing, signature verification) can be approximately doubled.
>
> Ferenc Rakoczi has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Further readability improvements.
>  - Added asserts for array sizes

src/hotspot/cpu/x86/stubGenerator_x86_64_dilithium.cpp line 119:

> 117: static address dilithiumAvx512PermsAddr() {
> 118:   return (address) dilithiumAvx512Perms;
> 119: }

Hear me out..  ...
enums!!

enum nttPermOffset {
  montMulPermsIdx = 0,
  nttL4PermsIdx = 64,
  nttL5PermsIdx = 192,
  nttL6PermsIdx = 320,
  nttL7PermsIdx = 448,
  nttInvL0PermsIdx = 704,
  nttInvL1PermsIdx = 832,
  nttInvL2PermsIdx = 960,
  nttInvL3PermsIdx = 1088,
  nttInvL4PermsIdx = 1216,
};
static address dilithiumAvx512PermsAddr(nttPermOffset offset) {
  return (address) dilithiumAvx512Perms + offset;
}

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

PR Review Comment: https://git.openjdk.org/jdk/pull/23860#discussion_r2008900858