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 |
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13 b09Fixed  |
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JDK-8226473 :
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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.