如果(DX)=5634H，执行指令 XOR DX, DX 后，(DX)= _______。

执行指令 XOR DX, DX 后，(DX)的内容为0000H。

XOR指令是异或指令，它将一个寄存器或内存单元的内容与另一个寄存器或内存单元的内容进行异或运算，结果存储到第一个操作数所指向的寄存器或内存单元中。在这里，指令 XOR DX, DX 将DX寄存器的内容与自身进行异或运算，相当于将DX寄存器的值设置为0。因此，执行指令后，(DX)的内容为0000H。

相关问题

x=0020h，y=0022h，mov ax，x mov dx,y sub ax,dx; cwd xor ax,dx sub ax,dx mov result,ax

The code first loads the values of x and y into the registers ax and dx respectively using the MOV instruction. It then subtracts the value of y from the value of x using the SUB instruction.

The CWD instruction is used to sign-extend the value in dx into ax, which is necessary when performing division or multiplication with signed values. However, in this code, it is not necessary and is likely just leftover from previous code.

The XOR instruction is used to calculate the absolute value of the difference between x and y. This is done by XORing the values of ax and dx together, which effectively removes any duplicate bits. The result is then saved back into ax.

The SUB instruction is again used to subtract the value of dx from ax, which effectively doubles the absolute value of the difference between x and y.

Finally, the result is moved back into the variable "result" using the MOV instruction. The end result is the absolute difference between x and y stored in the variable "result".

XOR DX,DX DIV WORD PTR[SI] PUSH DX

这是一段x86汇编指令，用于将一个16位的无符号整数除以另一个16位的无符号整数，并将余数压入栈中。XOR DX,DX是将DX寄存器清零的操作，DIV WORD PTR[SI]是执行除法操作的指令，其中WORD PTR[SI]表示要除以的数存储在SI指向的内存地址中。最后，PUSH DX是将余数压入栈中的操作。