"These functions calculate a <=> b. That is, if a is less than b, they return -1; if a is greater than b, they return 1; and if a and b are equal they return 0. If either argument is NaN they return 1..."
Note that this matches the definition of __lexf2, __eqxf2, __nexf2, __cmpxf2,
and __ltxf2.
fn __cmpxf2(a: f80, b: f80) callconv(.c) i32
fn __cmpxf2(a: f80, b: f80) callconv(.c) i32 {
return @backingInt(comparef.cmp_f80(comparef.LE, a, b));
}