Function resolve_subclasses

src/debug_utils/generic_reginfo/parse.rs:330–343

The text format has superclasses, conver those into subclasses which are needed by `GenericRegInfo`.

(
    classes: &mut PrimaryMap<RegClass, RegClassData>,
    superclasses: &SecondaryMap<RegClass, RegClassSet>,
)

/// The text format has superclasses, conver those into subclasses which are
/// needed by `GenericRegInfo`.
fn resolve_subclasses(
    classes: &mut PrimaryMap<RegClass, RegClassData>,
    superclasses: &SecondaryMap<RegClass, RegClassSet>,
) {
    // Propagate sub-classes backwards. This works because superclasses always
    // have a lower index than subclasses.
    for class in classes.keys().rev() {
        classes[class].sub_classes.insert(class);
        let sub_classes = classes[class].sub_classes;
        for superclass in superclasses[class] {
            classes[superclass].sub_classes |= sub_classes;
        }
    }
}

impl GenericRegInfo {
    /// Parses a textual register description into a [`GenericRegInfo`].