RFR: 8365570: C2 fails assert(false) failed: Unexpected node in SuperWord truncation: CastII [v5]

[Tobias Hartmann]

On Tue, 6 Jan 2026 23:53:18 GMT, Jasmine Karthikeyan <jkarthikeyan at openjdk.org> wrote:

>> Hi all,
>> This is a quick patch for the assert failure in superword truncation with CastII. I've added a check for all constraint cast nodes, and attached a reduced version of the fuzzer test. Thanks!
>
> Jasmine Karthikeyan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use Xcomp test run instead of Warmup(0)

Looks good to me too, thanks! I re-submitted some quick testing and will report back once it passed.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26827#pullrequestreview-3633571895