RFR: 8358032: Use crypto pmull for CRC32/CRC32C intrinsics on Ampere CPU [v4]

[Andrew Haley]

On Fri, 20 Jun 2025 08:41:56 GMT, Liming Liu <lliu at openjdk.org> wrote:

> > > Ping.
> > 
> > 
> > When you reply to my last point.
> 
> Does this mean changing the title? But I don't get how does the patch help Apple, since the patch does not effect the default behavior on Apple. There would be changes when enabling UseCryptoPmullForCRC32 for 383 bytes or smaller. So, are the improvements from this?

This PR does not only enable crypto pmull for CRC32/CRC32C intrinsics on Ampere CPU, it also improves the algorithm for some cases of short arrays. I made a suggestion for a title that accurately describes this PR. Feel free to write your own accurate title, or use mine.

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PR Comment: https://git.openjdk.org/jdk/pull/25609#issuecomment-2990325561