汇编语言-012（扩展加法指令ADC、带借位减法指令SBB、执行加法后进行ASCII调整指令、AAS 、AAM、AAD 、DAA指令将和数转成压缩十进制格式）

1:ADC : 扩展加法指令ADC

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.code
main PROCmov dl,0mov al,0FFhadd al,0FFh  ;AL=FEhadc dl,0     ;DL:AL = 01FEhmov edx,0mov eax,0FFFFFFFFhadd eax,0FFFFFFFFh  ;EAX = FFFFFFFEhadc edx,0           ;EDX:EAX = 00000001FFFFFFFEhINVOKE ExitProcess,0
main ENDP
END main

2:扩展加法指令应用，计算两个以字节数组存放的扩展整数之和

include Irvine32.inc.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
op1 BYTE 34h,12h,98h,74h,06h,0A4h,0B2h,0A2h
op2 BYTE 02h,45h,23h,00h,00h,86h,10h,80h
sum BYTE 9 DUP(0).code
main PROCmov esi,OFFSET op1  ;第一个操作数mov edi,OFFSET op2  ;第二个操作数mov ebx,OFFSET sum  ;和数mov ecx,LENGTHOF op1;字节数call Extended_Addmov esi,OFFSET summov ecx,LENGTHOF sumcall Display_Sumcall CrlfINVOKE ExitProcess,0
main ENDP;计算两个以字节数组存放的扩展整数之和
;接收:ESI和EDI 为两个加数的指针
;     EBX为和数变量指针，ECX为相加的字节数
;和数存储区必须比输入的操作数多一个字节
;返回：无
Extended_Add PROCpushadclc
L1:mov al,[esi]   ;取第一个数adc al,[edi]   ;与第二个数相加pushfd         ;保存进位标志mov [ebx],al   ;保存部分和add esi,1add edi,1add ebx,1popfd           ;恢复进位标志loop L1mov BYTE PTR[ebx],0   ;清除和数高字节adc BYTE PTR[ebx],0   ;加上其他的进位popadret
Extended_Add ENDPDisplay_Sum PROCpushad;指向最后一个元素add esi,ecxsub esi,TYPE BYTEmov ebx,TYPE BYTE
L1:mov al,[esi]  call WriteHexB  ;显示该字节sub esi,TYPE BYTEloop L1popadret
Display_Sum ENDPEND main

3:SBB : 带借位减法指令SBB

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.code
main PROC;32位操作数实现64位减法;EDX:EAX = 0000000700000001h - 2mov edx,7   ;高32位mov eax,1   ;低32位sub eax,2   sbb edx,0   ;EDX:EAX = 00000006FFFFFFFEhINVOKE ExitProcess,0main ENDP
END main

4:AAA : 执行加法后进行ASCII调整指令

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.code
main PROCmov ah,0      ;清空AHmov al,'8'    ;AX = 0038hadd al,'2'    ;AX = 006Ahaaa           ;AX=0100h(结果进行ASCII调整)or ax,3030h   ;AX = 3130='10'(转换为ASCII码)INVOKE ExitProcess,0
main ENDP
END main

5:AAA指令应用，多字节加法（ASCII码方式的），有隐含固定小数点的串执行ASCII运算


include Irvine32.incDECIMAL_OFFSET = 5  ;距离串右侧的偏移量
.data
decimal_one BYTE "100123456789765"  ;1001234567.89765
decimal_two BYTE "900402076502015"  ;9004020765.02015
sum BYTE (SIZEOF decimal_one + 1) DUP(0),0.code
main PROC;从最后一个数字位开始mov esi,SIZEOF decimal_one - 1mov edi,SIZEOF decimal_onemov ecx,SIZEOF decimal_onemov bh,0  ;进位值清零
L1:mov ah,0    ;执行加法前清除AHmov al,decimal_one[esi] ;取第一个数字add al,bh   ;加上之前的进位值aaa         ;调整和数AH=进位值mov bh,ah   ;将进位值保存到BHor bh,30h  ;转换为ASCII码add al,decimal_two[esi]  ;加第二个数字aaa          ;AH = 进位值or bh,ah     ;保存的进位值与现在进位值oror bh,30h    ;转成ASCII码or al,30h    ;将al转成ASCII码mov sum[edi],al  ;保存到sumdec esidec ediloop L1mov sum[edi],bh  ;保存最后进位值 ;显示和数字符串mov edx,OFFSET sumcall WriteStringcall Crlfexit
main ENDP
END main

6:AAS : 执行减法后且进行ASCII调整指令

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
val1 BYTE '8'
val2 BYTE '9'.code
main PROCmov ah,0mov al,val1  ;AX =0038sub al,val2  ;AX = 00FFhaas          ;AX = FF09hpushf        ;保存进位标志or al,30h    ;AX = FF39hpopf         ;恢复进位INVOKE ExitProcess,0
main ENDP
END main

7:AAM : 执行乘法后执行的ASCII调整

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
AscVal BYTE 05h,06h.code
main PROCmov bl,AscValmov al,[AscVal+1]mul bl  ;AX = 001Ehaam     ;AX = 0300hINVOKE ExitProcess,0
main ENDP
END main

8:AAD : 执行除法前执行的ASCII调整

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.data
quotient BYTE ?
remainder BYTE ?.code
main PROCmov ax,0307h   ;被除数aad            ;AX = 0025hmov bl,5       ;除数div bl         ;AX = 0207hmov quotient,almov remainder,ahINVOKE ExitProcess,0
main ENDP
END main

9:DAA : 压缩十进制数相加后，DAA指令将和数转成压缩十进制格式,ADD或ADC指令在AL中生成二进制和数，DAA在加法后执行

.386
.model flat,stdcall.stack 4096
ExitProcess PROTO,dwExitCode:DWORD.code
main PROC;计算35+48mov al,35hadd al,48h  ;AL = 7Dhdaa         ;AL = 83h(调整后的结果)INVOKE ExitProcess,0
main ENDP
END main

10:DAA应用，将两个16位压缩十进制整数加法，和数保存在一个压缩的双字

include Irvine32.inc.data
packed_1 WORD 4536h
packed_2 WORD 7207h
sum DWORD ?.code
main PROC;初始化和数与索引mov sum,0mov esi,0;低字节相加mov al,BYTE PTR packed_1[esi]add al,BYTE PTR packed_2[esi]daamov BYTE PTR sum[esi],al;高字节相加,包括进位标志位inc esimov al,BYTE PTR packed_1[esi]adc al,BYTE PTR packed_2[esi]daamov BYTE PTR sum[esi],al;若还有进位,则加上该进位值inc esimov al,0adc al,0mov BYTE PTR sum[esi],al;用十进制显示和数mov eax,sumcall WriteHexcall Crlfexit
main ENDP
END main