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  1. Qt
  2. QTBUG-75592

Floating-point invalid operation in QIcon::pimap() / reciprocal_mul_ps()

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.12.4, 5.13.1, 5.14.0 Alpha
    • 5.12.3
    • GUI: Painting
    • None
    • Windows 10, 1809, Visual Studio 2017, compile in x64 with option /EHa and e /fp:precise (for my application)
    • Windows
    • 4d2ee7f358a5cea64e7093aa0ab54e6422f8915e (qt/qtbase/5.12)

    Description

      I have an application with run on Windows, compile with Visual Studio 2017, 64 bits and SEH exception enable (option  /EHa and e /fp:precise).

      Since I update to the Qt 5.12.3, I have "Floating-point invalid operation" exception through inside QIcon conversion, especially inside reciprocal_mul_ps() function. Before, in version Qt 5.9.4, I have no problem.

       

      Here part of the call stack:

      static inline void convertARGBFromARGB32PM_sse4(uint *buffer, const uint *src, int count) (Where the exception occured)

      void QT_FASTCALL storeARGB32FromARGB32PM_sse4(...)

      ...

      void convert_generic()

      ....

      QPixmap QPixmapIconEngine::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)

       

      The exception occured on ligne "ia = _mm_sub_ps(_mm_add_ps(ia, ia), _mm_mul_ps(ia, _mm_mul_ps(ia, a)));" (line 101 of qdrawhelper_sse4.cpp)

       

      As example, this exception occurred when I call QWidget::setWindowIcon() with a QIcon (.ico, .png, etc.).

       

      It's very annoying, because it happen during painting also, so it's not possible to disable locally the FPE exception for part of code which call Qt.

       

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              allan.jensen Allan Sandfeld Jensen
              francoisj Francois JEAN
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