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  1. JDK
  2. JDK-8209420

Track membars for volatile accesses so they can be properly optimized

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 12
    • Fix Version/s: 12
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b09

      Description

      Aarch64 emits a single instruction for volatile accesses that include the required memory barriers. For this to work properly the aarch64 backend has to locate membars that go with a memory access to elide them. This is currently implemented with some complicated pattern matching that has proven fragile and painful to maintain. This change introduces a new and robust logic to locate membars and memory accesses for volatile accesses.

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              • Assignee:
                roland Roland Westrelin
                Reporter:
                roland Roland Westrelin
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                • Created:
                  Updated:
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