newlib/winsup/mingw/mingwex/math/isnan.c

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#include <math.h>
int
__isnan (double _x)
{
unsigned short _sw;
__asm__ ("fxam;"
"fstsw %%ax": "=a" (_sw) : "t" (_x));
return (_sw & (FP_NAN | FP_NORMAL | FP_INFINITE | FP_ZERO | FP_SUBNORMAL))
== FP_NAN;
}
#undef isnan
int __attribute__ ((alias ("__isnan"))) isnan (double);