Why does NaN - NaN == 0.0 with the Intel C++ Compiler?

Why does NaN - NaN == 0.0 with the Intel C++ Compiler?

c++ c floating-point ieee-754 icc

c

How does this float square root approximation work?

c++ c optimization floating-point ieee-754

c

Double precision - decimal places

c++ c precision ieee-754

c

What would cause the C/C++ <, <=, and == operators to return true if either argument is NaN?

c++ c nan ieee-754

c

In binary notation, what is the meaning of the digits after the radix point "."?

c++ c floating-point ieee-754

c

Ranges of floating point datatype in C?

c floating-point ieee-754

c

On 32-bit machines, atan2 is nondeterministic when I don't store its result in a variable. Why? [duplicate]

c++ c floating-point 32-bit ieee-754

c

Fused multiply add and default rounding modes

c gcc clang ieee-754 fma

c

flush-to-zero behavior in floating-point arithmetic

c embedded floating-point ieee-754

c