JDK-8152840 : aarch64: improve _unsafe_arraycopy stub routine
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: linux
- CPU: aarch64
- Submitted: 2016-03-28
- Updated: 2021-02-01
- Resolved: 2016-03-30
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| JDK 9 | Other |
|---|---|
9 b115Fixed  |
openjdk8u292Fixed |
Related Reports
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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.