[LUCENE-10145] Use VarHandles to speedup byte[] comparisons in some cases

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 9.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Adrien Grand
• Created: 04/Oct/21 12:37
• Updated: 28/Aug/22 16:27
• Resolved: 04/Oct/21 16:35

Description

I noticed that using Long#compareUnsigned on longs read via VarHandles is significantly faster than calling compareUnsigned directly. There are cases when this could be leveraged easily such as BKDWriter, which often keeps comparing 4-bytes or 8-bytes across byte[] arrays.

Issue Links

• links to: GitHub Pull Request #349