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  1. JDK
  2. JDK-8159063

aarch64: optimise unaligned array copy long

    Details

    • Subcomponent:
    • Resolved In Build:
      b131
    • CPU:
      aarch64
    • OS:
      linux

      Description

      The code generate for copy array of long is not optimised for the case where the src and/or dest are not 128 bit aligned.

      Some partners HW has improved performance when the address is 128 bit aligned.

      This issue proposed optimising array copy long so that all load/store are 128 bit aligned even when the src/dst are not aligned with respect to each other.

      A new flag will be provided -XX:+AvoidUnalignedAccesses to enable this. This flag will be turned on by default for partners where it is known that there is a performance benefit.

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            • Assignee:
              enevill Ed Nevill
              Reporter:
              enevill Ed Nevill
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              • Created:
                Updated:
                Resolved: