Method reg_for_class

winch/codegen/src/regset.rs:87–94

Allocate the next available register of the given class, returning `None` if there are no more registers available.

(&mut self, class: RegClass)

    /// Allocate the next available register of the given class,
    /// returning `None` if there are no more registers available.
    pub fn reg_for_class(&mut self, class: RegClass) -> Option<Reg> {
        self.available(class).then(|| {
            let bitset = &self[class];
            let index = bitset.allocatable.trailing_zeros();
            self.allocate(class, index.into());
            Reg::from(class, index as usize)
        })
    }

    /// Request a specific register.
    pub fn reg(&mut self, reg: Reg) -> Option<Reg> {