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  1. JDK
  2. JDK-8133352

aarch64: generates constrained unpredictable instructions

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
      None
    • Environment:

      AARCH64 development board

    • Subcomponent:
    • Resolved In Build:
      b81
    • CPU:
      aarch64
    • OS:
      linux

      Backports

        Description

        The aarch64 port is generating constrained unpredictable instructions.

        These are being generated for the STRX instructiion

        STRX Rs, Rt, [Rn]

        where Rs == Rt.

        and also LDAXP instructions

        LDAXP Rt1, Rt2, [Rn]

        where Rt1 == Rt2.

        Both of these are defined as constrained unpredictable and do in fact generate illegal instructions on one of our partners implementations.

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                • Assignee:
                  enevill Ed Nevill
                  Reporter:
                  enevill Ed Nevill
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