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  1. JDK
  2. JDK-8269119

C2: Avoid redundant memory barriers in Unsafe.copyMemory0 intrinsic

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 18
    • 17
    • hotspot
    • b14

    Description

      Unsafe::copyMemory0 intrinsic unconditionally inserts barriers arounds the call. It is conservative and barriers can be avoided in some cases (similar to what is done for scalar unsafe accesses; e.g., copying between on-heap arrays and off-heap is one of such cases).

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          duplicates

          Enhancement - null JDK-8269128 C2: Avoid redundant memory barriers in Unsafe.copyMemory0 intrinsic

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8283122 [AIX, s390] UnsafeCopyMemory 'Mismatched' Tests Fail on Big Endian Systems

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8316756 C2 EA fails with "missing memory path" when encountering unsafe_arraycopy stub call

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8268822 Performance of bulk copy with segments seems suboptimal

          • P3 - Major loss of function.
          • Closed
          links to

          Commit Commit openjdk/jdk/377b1867

          Review Review openjdk/jdk/5259

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              vlivanov Vladimir Ivanov
              vlivanov Vladimir Ivanov
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              Dates

                Created:
                Updated:
                Resolved: