JDK-8251971 : [lworld] Improve performance of arraycopy intrinsics
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: repo-valhalla
  • Priority: P3
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2020-08-18
  • Updated: 2025-11-19
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Other
repo-valhallaUnresolved
Related Reports
Duplicate :  
JDK-8329224 - [lworld] Intrinsification of Arrays.copyOf and Arrays.copyOfRange should support null-restricted arrays
Relates :  
JDK-8341767 - [lworld] JIT support for nullable, atomic, flat arrays
Relates :  
JDK-8350865 - [lworld] Follow-up work from adding support for nullable, flat, atomic arrays / fields
Description
Especially now that we added support for nullable, atomic, flat arrays with JDK-8341767, we need to re-work the implementation of the arraycopy intrinsics.

This includes performance work for the following intrinsics:
- _arraycopy
- _copyOf
- _copyOfRange

For copyOf(Range), look at "TODO 8251971" comments in the code and tests.

Some of this is also tracked by JDK-8350865.