JDK-8263252 : Improve fold_compares c2 optimizations
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 17
  • Priority: P3
  • Status: Open
  • Resolution: Unresolved
  • OS: generic
  • CPU: generic
  • Submitted: 2021-03-09
  • Updated: 2022-11-29
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8238812 - assert(false) failed: bad AD file
Relates :  
JDK-8275202 - C2: optimize out more redundant conditions
Relates :  
JDK-8264879 - Optimize out redundant ifs for constant test.
Description
<Follow-up enhancement from JDK-8238812 >

At least following types of improvements can be done as in initial  fix proposal of 8238812.
1. Extracting existing non-CmpU changes from fold_compares_helper
2. Support fold_compares to handle CmpU nodes