JDK-8345995 : [lworld] Flat arrays need to be redesigned to support new flat layouts
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: repo-valhalla
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2024-12-11
  • Updated: 2025-04-07
  • Resolved: 2025-01-16
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Other
repo-valhallaFixed
Related Reports
Blocks :  
JDK-8341767 - [lworld] JIT support for nullable, atomic, flat arrays
Duplicate :  
JDK-8331505 - [lworld] Support flat arrays of nullable value elements
Duplicate :  
JDK-8341764 - Interpreter aaload/aastore for new flat arrays on x64 and aarch64
Duplicate :  
JDK-8341762 - Redesign flat arrays to support new flat layouts
Description
Initial implementation of flat arrays in the lworld model was design with a single flat layout in mind. With the introduction of multiple flat layout (NON_ATOMIC_FLAT, ATOMIC_FLAT, NULLABLE_ATOMIC_FLAT), flat arrays have to be redesigned and all their access code updated.

The current design of flat arrays also have remains of the time where the VM was using Q-descriptors. This has to be removed.
Comments
A pull request was submitted for review. Branch: lworld URL: https://git.openjdk.org/valhalla/pull/1315 Date: 2024-12-11 13:43:24 +0000
11-12-2024