RFR: 8365570: C2 fails assert(false) failed: Unexpected node in SuperWord truncation: CastII [v2]

Fri Aug 22 06:33:51 UTC 2025

On Thu, 21 Aug 2025 15:18:15 GMT, Jasmine Karthikeyan <jkarthikeyan at openjdk.org> wrote:

>> Because the current comment says "should not truncate". That sounds more strong than "to be on the safe side".
>
> I think this is fair, I've pushed a commit that changes the comment wording. Let me know what you think!

We have `CastVV` which should be the packed version of `CastII`. The thing that is I think the most difficult is to properly wire it. In the simplest situation of all elements in the pack having the same control input can be easily handled, though.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26827#discussion_r2292827860