453 xchg RAX, RCX  label
454 xchg RCX, RAX  label
455 xchg EAX, ECX  label
456 xchg ECX, EAX  label
457 xchg AX, CX  label
458 xchg CX, AX  label
466 xchg RAX, [ECX]  label
467 xchg [ECX], RAX  label
468 xchg EAX, [ECX]  label
469 xchg [ECX], EAX  label
470 xchg AX, [ECX]  label
471 xchg [ECX], AX  label