[lworld] Integrated: 8376135: [lworld] Add JIT support for NULLABLE_NON_ATOMIC_FLAT layout

Mon Feb 2 15:32:07 UTC 2026

On Mon, 26 Jan 2026 14:01:08 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> Hi,
> 
> This PR implements the support of `NULLABLE_NON_ATOMIC_FLAT` layout in the JITs. There is nothing to do in C2. In C1, I need to implement loading/storing nullable value of a non-atomic field.
> 
> The test `TestValueClasses` is failing with `-XX:-TieredCompilation`, which I suspect is due to the substitutability test handling padding bytes incorrectly.
> 
> Please kindly review what there are for now, thanks a lot.

This pull request has now been integrated.

Changeset: 2ad3ce16
Author:    Quan Anh Mai <qamai at openjdk.org>
URL:       https://git.openjdk.org/valhalla/commit/2ad3ce1646bb5c717239f683686dd1034a9340c1
Stats:     268 lines in 22 files changed: 150 ins; 34 del; 84 mod

8376135: [lworld] Add JIT support for NULLABLE_NON_ATOMIC_FLAT layout

Reviewed-by: thartmann, fparain

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PR: https://git.openjdk.org/valhalla/pull/1970