451 xchg RAX, RCX  label
452 xchg RCX, RAX  label
453 xchg EAX, ECX  label
454 xchg ECX, EAX  label
455 xchg AX, CX  label
456 xchg CX, AX  label
464 xchg RAX, [ECX]  label
465 xchg [ECX], RAX  label
466 xchg EAX, [ECX]  label
467 xchg [ECX], EAX  label
468 xchg AX, [ECX]  label
469 xchg [ECX], AX  label