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

[Quan Anh Mai]

On Thu, 19 Feb 2026 06:21:39 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> Even after we have constant shuffle and constant mask recognizing the slice idiom and recovering origin remains highly non-trivial

I think you are misunderstanding, when `TypeVect` has constant information, the shuffle indices and the blend mask will constant fold, and there is no `iotaShuffle` subgraph or the compare-with-constant node there to inspect to extract the `origin`.

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PR Comment: https://git.openjdk.org/jdk/pull/24104#issuecomment-3925041361