RFR: 8276927: [PPC64] Port shenandoahgc to linux on ppc64le

[Roman Kennke]

On Thu, 11 Nov 2021 14:30:05 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> src/hotspot/cpu/ppc/gc/shenandoah/c1/shenandoahBarrierSetC1_ppc.cpp line 83:
>> 
>>> 81:     LIRGenerator* gen = access.gen();
>>> 82: 
>>> 83:     if (ShenandoahCASBarrier) {
>> 
>> I am not sure, but I almost think we should not even end up in the method with -ShenandoahCASBarrier. If anything, -ShenandoahCASBarrier should result in only calling super to emit regular CAS without any barriers.
>
> We hit this case when running `jdk/bin/java -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive -version`. x86 and aarch64 check for ShenandoahCASBarrier, too. So, looks like these checks are needed and correct.

Ok then.

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PR: https://git.openjdk.java.net/jdk/pull/6325