RFR: 8299327: Allow super late barrier expansion of store barriers in C2

[Erik Österlund]

On Mon, 9 Jan 2023 15:23:50 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

>> ZGC uses super late barrier expansion for load barriers in C2. Generational ZGC needs to do the same thing but for store barriers.
>
> src/hotspot/share/opto/graphKit.cpp line 1569:
> 
>> 1567:     st->as_Store()->set_unsafe_access();
>> 1568:   }
>> 1569:   if (barrier_data != 0) {
> 
> Do we need this check? The analogous load construction logic (https://github.com/openjdk/jdk/blob/17a3f0e2577f2f9eb3fe62a4b8261e3dbe4c3b28/src/hotspot/share/opto/memnode.cpp#L951) does not have it.

I'll remove the check for consistency.

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PR: https://git.openjdk.org/jdk/pull/11779