bug report: not-a-number not recognized when compiling for x86_64

[Mischa Baars]

Hi,

When running the example attached, you can see the compiler fails to 
recognize not-a-number's properly.

Anyone who would like to have a look?

Regards,
Mischa.
#include <stdio.h>
#include <math.h>

int main()
{
	double x = NAN;

	if (x == NAN)
	{
		printf("found a not-a-number\n");
	}

	return;
}