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  1. JDK
  2. JDK-8354572

Turn off AlwaysMergeDMB for Ampere CPU by default

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      Running the benchmark from JDK-8325269, we found that when we use -XX:-UseStoreStoreForCtor, -XX:-AlwaysMergeDMB significantly improved the the throughput. This experiment shows that "dmb ishst + dmb ishld" is faster than "dmb ish" on Ampere CPU. Thus, we prefer to turn off AlwaysMergeDMB for Ampere CPU by default.

            lliu Liming Liu
            lliu Liming Liu
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