test1.asm

test1.asm

; #!/usr/bin/python
; x = 2
; y = 5
; fun = 6*(x-y)*(5*(x+y)-15)/28
; print(hex(fun))

; 设置数据段
DATA SEGMENT
    X DB 2 ;变量X
    Y DB 5 ;变量Y
    A DB 28
    FUN DB ? 
DATA ENDS

; 设置堆栈段
STACK1 SEGMENT PARA STACK 
    DW 20H DUP(0)
STACK1 ENDS

; 设置代码段
CODE SEGMENT 
    ASSUME CS:CODE,DS:DATA,SS:STACK1
    START:
        MOV AX,DATA
        MOV DS,AX

        MOV BL, X 
        SUB BL, Y
        ; BX = X - Y

        MOV AL, BL ; AL = BL  (AL == 1BL)
        SAL AL, 1  ; AL *= 2  (AL == 2BL)
        ADD AL, BL ; AL += BL (AL == 3BL)
        SAL AL, 1  ; AL *= 2  (AL == 6BL)
        ; AX = BX * 6

        MOV DL, AL

        MOV BL, X
        ADD BL, Y 
        ; BX = X + Y

        MOV AL, BL ; AL = BL  (AL == 1BL)
        SAL AL, 1  ; AL *= 2  (AL == 2BL)
        SAL AL, 1  ; AL *= 2  (AL == 4BL)
        ADD AL, BL ; AL += BL (AL == 5BL)
        ; AX = BX * 5

        SUB AL, 15
        ; AX -= 15

        IMUL DL
        ; AX = AL * DL

        IDIV A
        ; AL = AX / 28

        MOV FUN, AL
        ; FUN = AL

        MOV AH, 4CH
        INT 21H
    CODE ENDS 
END START