JDK-8159063 : aarch64: optimise unaligned array copy long
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 9
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: linux
- CPU: aarch64
- Submitted: 2016-06-08
- Updated: 2021-02-01
- Resolved: 2016-06-24
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| JDK 9 | Other |
|---|---|
9 b131Fixed  |
openjdk8u292Fixed |
Related Reports
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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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