Method common_subclass

src/reginfo.rs:409–415

(&self, a: RegClass, b: RegClass)

    /// `None` if no common sub-class exists.
    #[inline]
    fn common_subclass(&self, a: RegClass, b: RegClass) -> Option<RegClass> {
        // Since classes are ordered topologically, this is the lowest indexed
        // class which is a sub-class of both original classes.
        (self.sub_classes(a) & self.sub_classes(b))
            .into_iter()
            .next()
    }

    /// The group size of registers in this class.
    ///