[jdk25u-dev] Integrated: 8365570: C2 fails assert(false) failed: Unexpected node in SuperWord truncation: CastII

[Vishal Chand]

On Sat, 14 Feb 2026 07:58:36 GMT, Vishal Chand <duke at openjdk.org> wrote:

> Clean backport of [8365570](https://github.com/openjdk/jdk/commit/775f48de6129092d05650fec17dad171944e6d89) - C2 fails assert(false) failed: Unexpected node in SuperWord truncation: CastII
> 
> *  Fixes assert failure in superword truncation with CastII. Since casts specifically change the type of a node, they should not be truncated during vectorization to maintain type safety.
> 
> * Additional Testing:
> 
> - [x]  New regression test fails without the fix, passes with it.
> - [x]  Linux x86_64 server fastebug compiler tests.

This pull request has now been integrated.

Changeset: be61f28e
Author:    Vishal Chand <vishalvc at amazon.com>
Committer: Paul Hohensee <phh at openjdk.org>
URL:       https://git.openjdk.org/jdk25u-dev/commit/be61f28e1ac9aa10e9d9debedcf27bc45161c4b9
Stats:     33 lines in 2 files changed: 31 ins; 0 del; 2 mod

8365570: C2 fails assert(false) failed: Unexpected node in SuperWord truncation: CastII

Backport-of: 775f48de6129092d05650fec17dad171944e6d89

-------------

PR: https://git.openjdk.org/jdk25u-dev/pull/269