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  1. JDK
  2. JDK-8152840

aarch64: improve _unsafe_arraycopy stub routine

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Introduced In Version:
      9
    • Resolved In Build:
      b115
    • CPU:
      aarch64
    • OS:
      linux

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        Description

        Currently, the aarch64 port simply implements this stub routine by calling StubRoutines::_jbyte_arraycopy. Just like x86 & sparc port does, we can make this faster by checking the alignment of the src, dest, and count, and call some better arraycopy stubs, (say StubRoutines::_jshort_arraycopy). I see some 1%+ performance improvement on Spark Terasort benchmark by doing this.

        BTW: we are missing _unsafe_arraycopy and _generic_arraycopy stubs for jdk8u, I would like to backport them from jdk9 after this improvement is approved and merged.

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                Assignee:
                fyang Fei Yang
                Reporter:
                fyang Fei Yang
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