RFR: 8358032: Use crypto pmull for CRC32/CRC32C intrinsics on Ampere CPU [v2]

[Andrew Haley]

On Wed, 4 Jun 2025 08:30:55 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> Generally looks reasonable to me as a non expert in crypto intrinsics. But we definitively need an expert to approve this in the end. I have a few comments below.

I'm happy enough, and it seems also to improvements on Apple silicon.

However, the title is misleading: while this PR may have started as something purely Ampere-specific, it no longer is. Something like "AArch64: CRC32/CRC32 enhancements" is perhaps rather vague, but at least it's true.

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PR Comment: https://git.openjdk.org/jdk/pull/25609#issuecomment-2961746523