[lworld] RFR: 8370880: [lworld] Split ciObjArrayKlass into ciRefArrayKlass and ciFlatArrayKlass [v3]

[Quan Anh Mai]

On Mon, 5 Jan 2026 13:13:05 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Quan Anh Mai has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:
>> 
>>  - wrong value is passed as flat
>>  - remove redundant changes
>>  - Merge branch 'lworld' into ciRefArray
>>  - Revert "can only infer klass if exact"
>>    
>>    This reverts commit be6143624d30c9ebfa560dd8161aa70270c68d24.
>>  - can only infer klass if exact
>>  - Refactor ciObjArrayKlass to align with the VM type
>
> src/hotspot/share/opto/type.cpp line 3700:
> 
>> 3698:         _is_ptr_to_narrowoop = UseCompressedOops && ::is_reference_type(field_bt);
>> 3699:       } else if (klass()->is_obj_array_klass()) {
>> 3700:         _is_ptr_to_narrowoop = UseCompressedOops;
> 
> `UseCompressedOops` is always true here, right? It's checked in line 3685. Also above.

You are right, I have removed those check.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1739#discussion_r2664699458