汇编语言把两个寄存器中的32位无符号二进制数相乘,其乘积仍在两个寄存器中,代码怎么写

2025-03-11 19:48:07
推荐回答(1个)
回答1:

;  32位 ×32位 乘法, 结果 64位 。 这是有别于你题目的另一种算法,供参考 ! 
        CODE  SEGMENT
              ASSUME    CS:CODE

           X  DD        111111
              DD        0           ; 增加 这个是为了左移时有空间
           Y  DD        11111
           Z  DD        2 DUP(0)
           
      START:  PUSH      CS
              POP       DS
              PUSH      CS
              POP       ES
             
              MOV       CX,32
         @0:
              SHR       WORD PTR Y+2,1
              RCR       WORD PTR Y,1
              JNC       @1
              MOV       AX,WORD PTR X
              ADD       WORD PTR Z,AX
              MOV       AX,WORD PTR X+2
              ADC       WORD PTR Z+2,AX
              MOV       AX,WORD PTR X+4
              ADC       WORD PTR Z+4,AX
              MOV       AX,WORD PTR X+6
              ADC       WORD PTR Z+6,AX
         @1:
              SHL       WORD PTR X,1
              RCL       WORD PTR X+2,1
              RCL       WORD PTR X+4,1
              RCL       WORD PTR X+6,1
              LOOP       @0
              
              MOV       AH,4CH
              INT       21H
              
        CODE  ENDS
              END       START

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