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  1. JDK
  2. JDK-8253015

Aarch64: Move linux code out from generic CPU feature detection

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 16
    • Fix Version/s: 16
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b18
    • CPU:
      aarch64
    • OS:
      linux

      Description

      https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2020-September/009690.html

      CPU feature detection in cpu/aarch64 assumes running on Linux. As a preparation for support of non-Linux AArch64 systems (i.e. windows-aarch64), Linux-specific code should go to os_cpu/linux_aarch64/vm_version_xxx.cpp.

      There is also a chance to clean up a bit:
      1. CPU features detection stub can be optimized
      2. dcpop feature is parsed from /proc/cpuinfo, although it is also available in HWCAP vector.
      3. AArch64 Feature_Flags implicitly mirrors of Linux HWCAP

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              • Assignee:
                akozlov Anton Kozlov
                Reporter:
                akozlov Anton Kozlov
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                Dates

                • Created:
                  Updated:
                  Resolved: