允许源操作数为32位的寄存器或内存操作数
ExitProcess PROTO
.code
main PROC
mov ebx, 0FFFFFFFFh
movsxd rax, ebx ;RAX = FFFFFFFFFFFFFFFFh
mov ebx, 01FFFFFFFh
movsxd rdx, ebx ;RDX = 000000001FFFFFFFh
mov ecx,0 ;结束程序
call ExitProcess
main ENDP
END
