fn res_d(cpu: &mut Cpu, bit: u8) {
        let d = cpu.d();

        cpu.set_d(res(d, bit));
    }
/// Helper function to clear bits in `D`
Helper function to clear bits in `D`
Helper function to clear bits in ` D `
fn res_d(cpu: &mut Cpu, bit: u8) {
        let d = cpu.d();
        cpu.set_d(res(d, bit));
    }
fn res_d ( cpu : & mut Cpu , bit : u8 ) { let d = cpu . d ( ) ; cpu . set_d ( res ( d , bit ) ) ; }
Helper function to clear bits in `D`
Helper function to clear bits in ` D `
cpu
&mut Cpu
bit
u8
cpu
&mut Cpu
bit
u8