"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, __eqtf2 and __netf2 are defined to have the same return value.
fn __netf2(a: f128, b: f128) callconv(.c) i32
fn __netf2(a: f128, b: f128) callconv(.c) i32 {
return __cmptf2(a, b);
}