用ARM汇编对十个数进行排序(冒泡实现) |
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题目:代码区有十个数字,存放在DATA1,现在需要将这个十个数从小到大排序并存放在数据区的DATA2中。 先直接上一个冗杂一点的代码,不过应该比较好理解。因为KEIL的注释复制过来会乱码,所以复制过来的时候把注释都删了。但是代码后面有截图,截图里有注释,基本每一步都注释过,绝对看得懂。 AREA RESET,CODE; EXPORT __Vectors EXPORT Reset_Handler __Vectors DCD __initial_sp DCD Reset_Handler Reset_Handler PROC NOP NOP DATA1 DCD 10,-1,3,7,16,5,15,2,6,3; ENTER LDR R1 , =DATA1 LDR R2 , =DATA2 MOV R0 , #0 FILL_DATA2_WITH_DATA1 LDR R3 , [R1,R0] STR R3 , [R2,R0] ADD R0 , #4 CMP R0 , #36 BLE FILL_UNFINISH BGT FILL_FINISH FILL_UNFINISH B FILL_DATA2_WITH_DATA1 FILL_FINISH MOV R5 , #0 OUT_LOOP MOV R4 , #0 ADD R5 , #1 MOV R9 , #10 CMP R5 , R9 BLE INNER_LOOP BGT SORT_FINISH INNER_LOOP LDR R6 , [R2,R4] ADD R4 , #4 MOV R10 , #36 CMP R4 , R10 BGT OUT_LOOP LDR R7 , [R2,R4] CMP R6 , R7 BLE LESS_THAN BGT GREATER_THAN LESS_THAN B INNER_LOOP GREATER_THAN STR R6 , [R2,R4] ADD R8 , R2 , R4 SUB R8 , R8 , #4 STR R7 , [R8] B INNER_LOOP SORT_FINISH B . ENDP AREA STACK,DATA DATA2 DCD 1,2,3,4,5,6,7,8,9,10 SPACE 0x100 __initial_sp END截图,包含注释:
这是Debug的截图 再给一个精炼的代码: AREA RESET,CODE EXPORT __Vectors EXPORT Reset_Handler __Vectors DCD __initial_sp DCD Reset_Handler Reset_Handler PROC NOP NOP DATA1 DCD 10,-1,3,7,16,5,15,2,6,3; main MOV R0,#0 MOV R7,#0 LDR R6,=DATA1 LDR R2,=DATA2 LOOP5 LDR R8,[R6,R7] STR R8,[R2,R7] ADD R7,#4 CMP R7,#40 BLT LOOP5 BGE LOOP1 LOOP1 ADD R1,R0,#4 B LOOP2 LOOP2 LDR R3,[R2,R0] LDR R4,[R2,R1] CMP R3,R4 BGT EXCHANGE B LOOP3 EXCHANGE STR R3,[R2,R1] STR R4,[R2,R0] B LOOP3 LOOP3 ADD R1,R1,#4 MOV R5,#40 CMP R1,R5 BLT LOOP2 BGE LOOP4 LOOP4 ADD R0,R0,#4 CMP R0,#36 BLT LOOP1 BGE STOP STOP B STOP B main B . ENDP AREA STACK,DATA DATA2 DCD 0,0,0,0,0,0,0,0,0,0 ; SPACE 0x100 __initial_sp END |
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