5 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
6 fn read(ptr: &u32) -> u32 {
9 asm!("mov $1, $0" : "=r" (out) : "*m" (ptr));
14 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
15 fn write(ptr: &mut u32, val: u32) {
17 asm!("mov $1, $0" : "=*m" (ptr) : "r" (val));
21 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
22 fn replace(ptr: &mut u32, val: u32) -> u32 {
25 asm!("mov $0, $1; mov $2, $0" : "+*m" (ptr), "=&r" (out) : "r" (val));
30 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
33 assert_eq!(read(&a), 1);
38 assert_eq!(replace(&mut c, 5), 4);
42 #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]