Hm... according to the example at http://en.cppreference.com/w/cpp/types/numeric_limits/signaling_NaN http://en.cppreference.com/w/cpp/types/numeric_limits/sig

Hm... according to the example at http://en.cppreference.com/w/cpp/types/numeric_limits/signaling_NaN http://en.cppreference.com/w/cpp/types/numeric_limits/signal... sNaN doesn't actually trap - it just records a special bit in a FPU exception register. So yes, it can affect the control flow - which is something you should expect reading aribtrary values!