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  1. Qt
  2. QTBUG-58446

[REG 5.7→5.8] Illegal instruction POPCNT

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P1: Critical P1: Critical
    • 5.9.0 Beta 2
    • 5.8.0
    • Core: Containers and Algorithms
    • None
    • Assistant.exe and Designer.exe falls at settings window
    • 72f49ef46a3426471b3c2102566d7d04390217d2

      Qt5Gui.dll and Qt5Guid.dll uses intrisic instruction __popcnt64
      But processor Intel Core 2 DUO E8500 do not have this.
      See file qalgorithms.h at string 653- 659

      #if Q_PROCESSOR_WORDSIZE == 8
/#define QALGORITHMS_USE_BUILTIN_POPCOUNTLL
Q_DECL_CONSTEXPR Q_ALWAYS_INLINE uint qt_builtin_popcountll(quint64 v) Q_DECL_NOTHROW
{
    return __popcnt64(v); // <-ILLEGAL instrucrion this!!
}

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            thiago Thiago Macieira
            nickb53 Nickolay Bychkov
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              Created:
              Updated:
              Resolved:

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