1[bits 64] 2xchg ax, ax 3xchg ax, bx 4xchg bx, ax 5xchg eax, eax 6xchg eax, ebx 7xchg ebx, eax 8xchg rax, rax 9xchg rax, rbx 10xchg rbx, rax 11 12xchg al, al 13xchg al, r8b 14xchg r8b, al 15 16xchg ax, ax 17xchg ax, r8w 18xchg r8w, ax 19xchg ax, r9w 20xchg r9w, ax 21 22xchg eax, eax 23xchg eax, r8d 24xchg r8d, eax 25xchg eax, r9d 26xchg r9d, eax 27 28xchg rax, rax 29xchg rax, r8 30xchg r8, rax 31xchg rax, r9 32xchg r9, rax 33