"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 __letf2, __eqtf2, __netf2, __cmptf2,
and __lttf2.
fn __cmptf2(a: f128, b: f128) callconv(.c) i32
fn __cmptf2(a: f128, b: f128) callconv(.c) i32 {
return @backingInt(comparef.cmpf2(f128, comparef.LE, a, b));
}