RFR: 8221554: aarch64 cross-modifying code [v3]

[Andrew Haley]

On Mon, 12 Oct 2020 14:51:31 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Alan Hayward has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
>> 
>>  - AArch64: Add cross modify fence verification
>>  - AArch64: Use cross_modify_fence instead of maybe_isb
>>  - Split cross_modify_fence
>
> src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp line 5317:
> 
>> 5315: #endif
>> 5316: }
>> 5317: 
> 
> Unless VerifyCrossModifyFence is turned on in debug builds it will almost never be used. Please turn this on by default in AArch64 debug builds.

Please...

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PR: https://git.openjdk.java.net/jdk/pull/428