"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, __eqdf2 and __nedf2 are defined to have the same return value.
pub fn __nedf2(a: f64, b: f64) callconv(.c) i32
pub fn __nedf2(a: f64, b: f64) callconv(.c) i32 {
return __cmpdf2(a, b);
}