"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, __eqsf2 and __nesf2 are defined to have the same return value.
pub fn __nesf2(a: f32, b: f32) callconv(.c) i32
pub fn __nesf2(a: f32, b: f32) callconv(.c) i32 {
return __cmpsf2(a, b);
}