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  1. JDK
  2. JDK-8059139

It should be possible to explicitly disable usage of TZCNT instr w/ -XX:-UseBMI1Instructions

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 8u40, 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b40

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        Description

        Before JDK-8055494 it was possible to disable usage of all BMI1-related instructions by passing -XX:-UseBMI1Instructions to JVM, but fix for JDK-8055494 made it impossible to disable usage of TZCNT.

        TZCNT is part of BMI1 instruction set, so it should be possible to explicitly disable its usage via -XX:-UseBMI1Instuctions passed to JVM.

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                Assignee:
                kvn Vladimir Kozlov
                Reporter:
                fzhinkin Filipp Zhinkin
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