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  1. JDK
  2. JDK-8203283

Provide 8-byte Atomic::add fallback for 32-bit platforms

    Details

    • Type: Enhancement
    • Status: Open
    • Priority: P3
    • Resolution: Unresolved
    • Affects Version/s: 11
    • Fix Version/s: tbd
    • Component/s: hotspot
    • Labels:

      Description

      Currently, trying to use Atomic::add over 64-bit value on 32-bit platform results in:

      /home/shade/jdk-jdk/build/linux-x86-normal-server-fastdebug/hotspot/variant-server/libjvm/objs/jfrStringPoolBuffer.o: In function `unsigned long long Atomic::FetchAndAdd<Atomic::PlatformAdd<8u> >::operator()<unsigned long long, unsigned long long>(unsigned long long, unsigned long long volatile*, atomic_memory_order) const':
      /home/shade/jdk-jdk/src/hotspot/share/runtime/atomic.hpp:670: undefined reference to `unsigned long long Atomic::PlatformAdd<8u>::fetch_and_add<unsigned long long, unsigned long long>(unsigned long long, unsigned long long volatile*, atomic_memory_order) const'

      This can be emulated with CAS-ed loop on most platforms.

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              • Assignee:
                Unassigned
                Reporter:
                shade Aleksey Shipilev
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                Dates

                • Created:
                  Updated: