#include <stdio.h>
#include <fenv.h>

int main() {
    volatile union { unsigned i; float f; } u;
    volatile union { unsigned long l; double d; } v;

    feclearexcept(FE_ALL_EXCEPT);
    u.f = __builtin_nansf("");
    v.d = u.f;
    printf("%08x\n", u.i);
    printf("%016lx - %d\n", v.l, fetestexcept(FE_INVALID));

    feclearexcept(FE_ALL_EXCEPT);
    v.d = __builtin_nans("");
    u.f = v.d;
    printf("%016lx\n", v.l);
    printf("%08x - %d\n", u.i, fetestexcept(FE_INVALID));

    return 0;
}