JDK-8284459 : Add x86 back-end implementation for LEADING and TRAILING ZEROS COUNT operations
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: repo-panama
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • CPU: x86_64
  • Submitted: 2022-04-06
  • Updated: 2025-02-17
  • Resolved: 2022-04-22
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Other
repo-panamaFixed
Related Reports
Relates :  
JDK-8285036 - [x86] Add back-end implementation for LEADING and TRAILING ZEROS COUNT operations
Relates :  
JDK-8284502 - X86: Backend support for all the newly proposed VectorOperations (Incubation4)
Description
- Extend SLP vectorizer to auto-vectorize  following Java SE APIs.
     1) Integer.numberOfLeadingZeros()
     2) Long.numberOfLeadingZeros() 
     3) Integer.numberOfTrailingZeros()
     4) Long.numberOfTrailingZeros()

- Add optimized X86 backend implementation for VectorOperations.LEADING_ZERO_COUNT and VectorOperations.TRAILING_ZEROS_COUNT
  for AVX512  and legacy targets.
Comments
A pull request was submitted for review. URL: https://git.openjdk.java.net/panama-vector/pull/189 Date: 2022-04-07 07:30:24 +0000
07-04-2022