https://devblogs.microsoft.com/oldnewthing/20100305-00/?p=14713/
How do I access the magic IEEE floating point values like NaN in code? - The Old New Thing
Mar 5, 2010 - There are functions like _isnan, _isnanf, _finite, and _fpclass for detecting that a floating point value is one of the special values like NaN, but how
how do iieee floating pointthe magicold newaccess