RFR: 8367292: VectorAPI: Optimize VectorMask.fromLong/toLong() for SVE

[Xiaohong Gong]

On Tue, 28 Oct 2025 05:54:02 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> @XiaohongGong Thanks for merging, running testing now :)
>
> Hi @eme64 , I updated a commit to rename the helper matcher function and add some comments, assertion inside the function. Would you mind taking another look at the latest change? Thanks a lot!

> @XiaohongGong Thanks for the updates. I left a few more comments.
> 
> And thanks for filing: https://bugs.openjdk.org/browse/JDK-8370666 Are you planning on working on that, or do you know someone else? I could try, but I'm less familiar with all the concepts, and would need a lot of help.

Yeah, I'd be glad to work on that in the future, but I have some more urgent tasks to handle right now. I can probably start on it in about 3–4 weeks. Would that be okay with you?

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PR Comment: https://git.openjdk.org/jdk/pull/27481#issuecomment-3460248930