"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, __eqhf2 and __nehf2 are defined to have the same return value.
fn __nehf2(a: f16, b: f16) callconv(.c) i32
fn __nehf2(a: f16, b: f16) callconv(.c) i32 {
return __cmphf2(a, b);
}