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".