JDK-8278857 : C2: optimize (x << 2) & -4 to x (and similar patterns)
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 18
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2021-12-15
  • Updated: 2022-11-29
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8277850 - C2: optimize mask checks in counted loops
Description
This came up in the review of 8277850: C2 (optimize mask checks in counted loops). See this comment:

https://github.com/openjdk/jdk/pull/6697#pullrequestreview-827071366