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.