[jdk26] RFR: 8365570: C2 fails assert(false) failed: Unexpected node in SuperWord truncation: CastII

Fri Jan 9 08:49:33 UTC 2026

Hi all,

This pull request contains a backport of commit [775f48de](https://github.com/openjdk/jdk/commit/775f48de6129092d05650fec17dad171944e6d89) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Jasmine Karthikeyan on 9 Jan 2026 and was reviewed by Christian Hagedorn, Tobias Hartmann and Emanuel Peter.

Thanks!

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Commit messages:
 - Backport 775f48de6129092d05650fec17dad171944e6d89

Changes: https://git.openjdk.org/jdk/pull/29134/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29134&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365570
  Stats: 33 lines in 2 files changed: 31 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29134.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29134/head:pull/29134

PR: https://git.openjdk.org/jdk/pull/29134