JDK-8329254 : optimize integral reverse operations on x86 GFNI target.
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 19,21,23
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • CPU: x86_64
  • Submitted: 2024-03-28
  • Updated: 2024-08-01
  • Resolved: 2024-04-11
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JDK 23
23 b18Fixed
Related Reports
Relates :  
JDK-8284960 - Integration of JEP 426: Vector API (Fourth Incubator)
Description
- Efficient GFNI based instruction sequence to compute integral reverse operation was added along with JEP-426 (VectorAPI 4th Incubation).
https://bugs.openjdk.org/browse/JDK-8284960

- However, the CPUID based feature detection for GFNI was incorrectly performed under AVX512 check.
Comments
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/18530 Date: 2024-03-28 11:41:21 +0000
01-08-2024
Changeset: b04b3047 Author: Jatin Bhateja <jbhateja@openjdk.org> Date: 2024-04-11 06:28:26 +0000 URL: https://git.openjdk.org/jdk/commit/b04b3047ff5c5526bdf47925210e2a35ca191e6e
11-04-2024
ILW = Incorrect CPU feature detection, GFNI on x86, no workaround = MLH = P4
28-03-2024