[lworld] RFR: 8374800: [lworld] Add a NULLABLE_NON_ATOMIC_FLAT layout [v2]

[Frederic Parain]

On Wed, 14 Jan 2026 20:05:40 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Frederic Parain has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   More renaming
>
> src/hotspot/share/classfile/fieldLayoutBuilder.cpp line 1212:
> 
>> 1210:         _null_free_non_atomic_layout_alignment = _payload_alignment;
>> 1211:       }
>> 1212:       if (UseNullableValueFlattening) {
> 
> Could this be else if (UseNullableValueFlattening)?  These are mutually exclusive iirc so the else if would make that explicit.

They are not mutually exclusive. Each layout can be enabled/disabled individually, mostly for testing/debugging purpose.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1407#discussion_r2699412900