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  1. JDK
  2. JDK-8222075

C2: Enable loop predication for subtype checks

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P3
    • Resolution: Duplicate
    • Affects Version/s: 13
    • Fix Version/s: tbd
    • Component/s: hotspot
    • Labels:

      Description

      Subtype checks sometimes require complex control flow and loop predication can't handle it.

      One example is receiver subtype checks for invokeinterface/invokespecial of interface methods: it involves a subtype check against an interface. As JDK-8220708 demonstrates, when the check is loop invariant, it is very beneficial to hoist it out of the loop.

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              • Assignee:
                vlivanov Vladimir Ivanov
                Reporter:
                vlivanov Vladimir Ivanov
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