RFR: 8305236: Some LoadLoad barriers in the interpreter are unnecessary after JDK-8220051

[SUN Guoyun]

On Tue, 4 Apr 2023 02:23:01 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> After JDK-8220051, Interpreter::notice_safepoints() only be executed at a safe point, so LoadLoad barrier is useless.
>> Barrier directives are generally time-consuming, so this patch removes LoadLoad be used for aarch64 and riscv.
>> 
>> Jtreg tier1-2 testing for aarch64 has been done.
>> 
>> Please help review it.
>> 
>> Thanks.
>
> May I suggest changing the PR and JBS issue title to:
> 
> 8305236: Some LoadLoad barriers in the interpreter are unnecessary after JDK-8220051

Thanks @dholmes-ora to review. @theRealAph @RealFYang Please help confirm if there is still a problem with the patch.

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PR Comment: https://git.openjdk.org/jdk/pull/13244#issuecomment-1495417609