RFR: 8318650: Optimized subword gather for x86 targets. [v13]

[Jatin Bhateja]

On Mon, 26 Feb 2024 09:36:09 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> 64 bit sub-word SPECIES will either hold 8 bytes values or 4 short values, algorithm appropriately handle it.
>
> Are you saying that the constraints are too relaxed, but currently no outside algorithm would pass something bad?
> But then why not tighten the constraint to be correct?
> What if I at some point start using this node in SuperWord / AutoVectorization?

Agree, added a tighter constraint for this in _match_rule_supported_vector_.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16354#discussion_r1502589914