RFR: 8269119: C2: Avoid redundant memory barriers in Unsafe.copyMemory0 intrinsic [v2]

[Roland Westrelin]

On Thu, 2 Sep 2021 12:59:41 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Vladimir Ivanov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove memory barriers
>
> src/hotspot/share/opto/library_call.cpp line 4082:
> 
>> 4080: 
>> 4081:   bool is_array = _gvn.type(addr)->isa_aryptr();
>> 4082:   return is_mixed || (in_heap && !is_array);
> 
> Why is the is_array check needed?

Tobias explained that one to me privately

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PR: https://git.openjdk.java.net/jdk/pull/5259