JDK-8351666 : [PPC64] Make non-volatile VectorRegisters available for C2 register allocation
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 25
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • CPU: ppc
  • Submitted: 2025-03-11
  • Updated: 2025-05-21
  • Resolved: 2025-05-14
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JDK 25
25 b23Fixed
Related Reports
Relates :  
JDK-8354636 - [PPC64] Clean up comments regarding frame manager
Relates :  
JDK-8188139 - PPC64: Superword Level Parallelization with VSX
Relates :  
JDK-8354650 - [PPC64] Try to reduce register definitions
Description
VectorRegisters VR20-VR31 (same as VSR52-VSR63) are non-volatile and currently excluded from C2 register allocation.
We can make the available if we save them when entering Java from C and restore them when returning.
Comments
Changeset: fc6f4da8 Branch: master Author: Martin Doerr <mdoerr@openjdk.org> Date: 2025-05-14 08:38:01 +0000 URL: https://git.openjdk.org/jdk/commit/fc6f4da8e72db4385c96fe0139ce43ec8c8ca2e6
14-05-2025
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/23987 Date: 2025-03-11 14:39:37 +0000
14-03-2025