RFR: 8303762: Optimize vector slice operation with constant index using VPALIGNR instruction [v13]

[Quan Anh Mai]

On Tue, 17 Feb 2026 12:11:49 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> But this will affect other intrinsics, too, they are not implemented using other vector API operations.
>
> We only perform fallback inlining on first intrinsification failure for sliceOp, this is a very localized change.
> https://github.com/jatin-bhateja/jdk/blob/1dfff5589c8b6c83dfc9810bddbb676c7982c904/src/hotspot/share/opto/callGenerator.cpp#L455

Thanks for pointing out the change. I think that's more hacky than I have expected.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24104#discussion_r2816742757