RFR: 8365147: AArch64: Replace DMB + LD + DMB with LDAR for C1 volatile field loads [v2]

[Ruben]

On Tue, 7 Oct 2025 10:14:48 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Samuel Chee has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Address review comments
>>    
>>    Change-Id: Ica13be8094ac0f057066042ef0a5ec5927b98dfd
>>  - Refine code generation for mem2reg_volatile
>>    
>>    The patch is contributed by @theRealAph.
>>    
>>    Change-Id: I7ab1854dd238cdce72a4ab218b5b4ee84ad39586
>
>> See #27432
> 
> Now that this is integrated, you may proceed.
> 
> Will you also proceed with [8360654](https://github.com/openjdk/jdk/pull/26000)?

Hi @theRealAph,
I've pushed changes for this PR to a new branch https://github.com/openjdk/jdk/compare/master...ruben-arm:jdk:pr-8365147 as Samuel is currently not available. Once he is back, he can update this PR's branch.
In the meanwhile, I'm planning to run more of the `jcstress` testing. I'd appreciate your feedback on the version in the new branch.

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PR Comment: https://git.openjdk.org/jdk/pull/26748#issuecomment-3481304989