JDK-8275047 : Optimize existing fill stubs for AVX-512 target
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 18
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: x86_64
  • Submitted: 2021-10-11
  • Updated: 2025-02-05
  • Resolved: 2021-10-26
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.
JDK 18
18 b21Fixed
Related Reports
Causes :  
JDK-8349452 - Performance regression for Arrays.fill() with AVX512
Relates :  
JDK-8247307 - C2: Loop array fill stub routines are not called
Relates :  
JDK-8299179 - ArrayFill with store on backedge needs to reduce length by 1
Description
- Optimize existing macro assembly routine MacroAssembler::generate_fill called from fill stubs for various primitive types.
- Enable JVM flag -XX:OptimizeFill by default over X86.
Comments
Changeset: 4be88d54 Author: Jatin Bhateja <jbhateja@openjdk.org> Date: 2021-10-26 12:34:56 +0000 URL: https://git.openjdk.java.net/jdk/commit/4be88d5482d45e22eb756a6e2ad19ebd7110639a
26-10-2021
This is related to JDK-8247307, see also discussion in RFR thread: https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-June/038635.html
11-10-2021