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  1. JDK
  2. JDK-8217909

Make unused r12 register (without compressed oops) available to regalloc in C2

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    • b09
    • x86_64
    • generic

    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.

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          Enhancement - null JDK-8218767 ZGC: Do not assume that r12 is a special register in C2

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          relates to

          Enhancement - null JDK-8233743 AArch64: Make r27 conditionally allocatable

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8221249 x86: make r12_heapbase register available when compressed oops do not require it

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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              rkennke Roman Kennke
              rkennke Roman Kennke
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                Updated:
                Resolved: