将DX，AX组成的32位数循环左移3位

data segment
data ends
stack segment stack
	top label word
	dw 100 dup (?)
stack ends
code segment
	assume cs:code,ds:data,ss:stack
main proc far
	mov ax,data
	mov ds,ax
	mov ax,stack
	mov ss,ax
	lea sp,top
	
	;1110 0001 1100 1010 | 1110 0010 0001 1111
	;dx=E1CA ax=E21F(补码)
	;循环左移三位后：0 0001 1100 1010  111  |  0 0010 0001 1111111
	;dx=0E57 ax=10FF
	mov dx,-7734			;1110 0001 1100 1010(补码)
	mov ax,-7649			;1110 0010 0001 1111(补码)
	
	mov cx,3
L1:
	shl ax,1		;ax逻辑左移
	rcl dx,1		;dx带进位循环左移
	adc ax,0		;ax加上dx移出去的最高位
	loop L1
	
	mov ah,4ch
	int 21h
main endp
code ends
	end main

将DX，AX组成的32位数循环右移3位

data segment
data ends
stack segment stack
	top label word
	dw 100 dup (?)
stack ends
code segment
	assume cs:code,ds:data,ss:stack
main proc far
	mov ax,data
	mov ds,ax
	mov ax,stack
	mov ss,ax
	lea sp,top
	
	;1110 0001 1100 1010 | 1110 0010 0001 1111
	;dx=E1CA ax=E21F(补码)
	;循环右移三位后：1111 1100 0011 1001  |  010  1110 0010 0001 1
	;dx=FC39 ax=5C43
	mov dx,-7734			;1110 0001 1100 1010(补码)
	mov ax,-7649			;1110 0010 0001 1111(补码)
	
	mov cx,3
L1:
	shr dx,1
	rcr ax,1
	mov bx,0	;要用mov，不改变CF，xor bx,bx 会把CF变成0
	adc bx,0
	ror bx,1
	add dx,bx
	loop L1
	
	mov ah,4ch
	int 21h
main endp
code ends
	end main