"These functions return a nonzero value if either argument is NaN, or if a and b are unequal." Note that due to some kind of historical accident, __eqxf2 and __nexf2 are defined to have the same return value.
fn __nexf2(a: f80, b: f80) callconv(.c) i32
fn __nexf2(a: f80, b: f80) callconv(.c) i32 {
return __cmpxf2(a, b);
}