JDK-8217909 : Make unused r12 register (without compressed oops) available to regalloc in C2
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 8,11,13
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: x86_64
  • Submitted: 2019-01-28
  • Updated: 2019-11-07
  • Resolved: 2019-02-20
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JDK 13
13 b09Fixed
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JDK-8226473 :  
Description
When running with compressed oops, the r12 register holds the heapbase, and thus is not available to register allocation in C2. However, when *not* running with compressed oops, it is still not available and remains unused. It should be made available to register allocation in this case.