编写一个汇编程序， 统计双字变量DDVAR的内容中二进制位是1的位数，并存入变量COUNT中

DATA SEGMENT
x dd 0fffffffh
xl equ word ptr x
xh equ word ptr x+2
count dw 0
DATA ENDS

STACK SEGMENT STACK
DW 100H DUP(?)
STACK ENDS

CODE SEGMENT
assume cs:code ds:data ss:stack

START: mov ax,data
mov ds,ax ;data到ax

mov dx,xl
mov bx,8000h
mov cx,16

XLL: call COUNT0 ;调用COUNT@
loop XLL

mov dx,xh
mov bx,8000h
mov cx,16

XHH: call COUNT0
loop XHH

mov ax,count
mov bl,10
div bl
add al,'0' ;商在al
add ah,'0' ;余数ah
push ax
mov dl,al
mov ah,2
int 21h
pop ax
mov dl,ah
mov ah,2
int 21h

mov ax,4c00h ;返回dos
int 21h

COUNT0 PROC NEAR ;统计1的个数
mov ax,dx
or ax,bx ;将其中一位，置1
cmp ax,dx ;和原来比较
jz done
k: shr bx,1 ;右移一位
RET
done: inc count ;相等，则count+1
jmp k

COUNT0 ENDP

CODE ENDS
END START