use std::arch::asm;
fn main(){

    let i: u64 = 3;
    let o: u64;
    unsafe {
        asm!(
                "mov {0}, {1}",
                "add {0}, 5",
                out(reg) o,
                in(reg) i,
            );
    }
    println!("Ending status:  i = {i}, o = {o}");
}