RFR: 8343689: AArch64: Optimize MulReduction implementation [v8]

[Andrew Haley]

On Fri, 11 Jul 2025 07:36:20 GMT, Hao Sun <haosun at openjdk.org> wrote:

> I see. Thanks for your explanation. Current version is okay to me. Perhaps we may want to add more comments here.

The current code is just the sort of trap for the maintainer that leads to hard-to-find bugs. It'd be much better to remove the need for this comment by forcing everyone to provide two distinct scratch registers.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23181#discussion_r2200592617