JDK-8285282 : Add C2 mid-end and x86 back-end implementation for bit COMPRESS_BITS and EXPAND_BITS operation
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: tbd
  • Priority: P4
  • Status: Closed
  • Resolution: Duplicate
  • CPU: x86_64
  • Submitted: 2022-04-20
  • Updated: 2022-04-22
  • Resolved: 2022-04-22
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Other
tbdResolved
Related Reports
Duplicate :  
JDK-8285281 - [x86] Add C2 mid-end and back-end implementation for COMPRESS_BITS and EXPAND_BITS operations
Description
- Intrinsify scalar following operation  
    Integer.compress
    Integer.expand
    Long.compress
    Long.expand

- Add C2 IR nodes and corresponding ideal transformations for new operations. 

- Use X86 parallel bit extraction and deposition instruction to emit efficient JIT sequence.
Comments
Setting state to 'Closed' rather than 'Resolved' (in general, issues set to "Resolved" have a corresponding changeset).
22-04-2022
JDK-8285281
21-04-2022