fn rr_d(cpu: &mut Cpu) {
        let d = cpu.d();

        let r = rr(cpu, d);

        cpu.set_d(r);
    }
/// Rotate `D` to the right through carry
Rotate `D` to the right through carry
Rotate ` D ` to the right through carry
fn rr_d(cpu: &mut Cpu) {
        let d = cpu.d();
        let r = rr(cpu, d);
        cpu.set_d(r);
    }
fn rr_d ( cpu : & mut Cpu ) { let d = cpu . d ( ) ; let r = rr ( cpu , d ) ; cpu . set_d ( r ) ; }
Rotate `D` to the right through carry
Rotate ` D ` to the right through carry
cpu
&mut Cpu
cpu
&mut Cpu