newlib-cygwin/winsup/mingw/mingwex/math/fucom.c

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int
__fp_unordered_compare (long double x, long double y){
unsigned short retval;
__asm__ (
"fucom %%st(1);"
"fnstsw;"
: "=a" (retval)
: "t" (x), "u" (y)
);
return retval;
}