JDK-8370450 : [lworld] Alternate implementation of the substitutability test method
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: repo-valhalla
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2025-10-22
  • Updated: 2025-10-27
The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

To download the current JDK release, click here.
Other
repo-valhallaUnresolved
Related Reports
Relates :  
JDK-8370714 - [lworld] Reimplement hashcode for Value Objects
Description
The current implementation of the substitutability test used by acmp* when comparing two values has some performance issues, both when generating the method and when executing it.

Alternate implementations aiming to reduce these costs should be explored.
Comments
A pull request was submitted for review. Branch: lworld URL: https://git.openjdk.org/valhalla/pull/1695 Date: 2025-10-22 17:54:29 +0000
22-10-2025