Method xctz64

pulley/src/interp.rs:2441–2445

(&mut self, dst: XReg, src: XReg)

    }

    fn xctz64(&mut self, dst: XReg, src: XReg) -> ControlFlow<Done> {
        let a = self.state[src].get_u64();
        self.state[dst].set_u64(a.trailing_zeros().into());
        ControlFlow::Continue(())
    }

    fn xclz32(&mut self, dst: XReg, src: XReg) -> ControlFlow<Done> {
        let a = self.state[src].get_u32();