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  1. JDK
  2. JDK-8331859

[PPC64] Remove support for Power7 and older

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Details

    • Enhancement
    • Resolution: Unresolved
    • P4
    • tbd
    • 23
    • hotspot

    Description

      Linux PPC64le requires Power8 since the beginning.
      AIX requires Power8 with the new OpenXL based build (JDK-8307520). The old build has been removed in JDK 23 (JDK-8327701).
      Linux PPC64 Big Endian is no longer officially supported (only kept alive for development, debugging and testing purposes).

      The following checks for old processors are no longer needed:
      8: VM_Version::has_lqarx()
      7: VM_Version::has_popcntw()
      6: VM_Version::has_cmpb()
      5: VM_Version::has_popcntb()
      These ones and some more checks for old instructions are no longer needed. All code which is no longer reachable when removing them should also get removed.
      Checks like "PowerArchitecturePPC64 >= 8" (or older) can be removed.

      Atomic::PlatformCmpxchg<1>::operator() can be simplified by using sub-word instructions (lharx, lbarx).

      Build flags "-mcpu=powerpc64 -mtune=power5" for Big Endian linux should get replaced by "-mcpu=power8 -mtune=power8" as already used for linux PPC64le.

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            Unassigned Unassigned
            mdoerr Martin Doerr
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              Created:
              Updated: