[理工] 105台大電機丙計系 對答案

[tzutengweng (神奇的湯姆)]

1.ABCD (不會亂猜)
2.CE  (不會亂猜)
3.D
4.DE
5.

假設A, B 的base adress為$s1, $s2



      add $t0, $0, $0   // i=0

Loop: lw  $t1, 0($s1)   //$t1= A[i]

      lw  $t2, 0($s2)   //$t2= B[i]

      add $t3, $t1, $t2 // $t3=A[i]+B[i]

      sw  $t3, 0($s1)   //A[i]= $t3

      srl $t1, $t1, 1   //$t1=A[i]/2  (感謝j大  本來寫sll)

      sw  $t1, 0($s2)   //B[i]=$t1

      addi $s1, $s1, 4

      addi $s2, $s2, 4

      addi $t0, $t0, 1  //i=i+1

      slti $t1, $t0, n  // if i<n, $t1=1 else $t1=0;

      bne  $t1, $0, Loop

      Exit:

請大家幫忙debug  感恩!


6. BD
7. DE
8. CDE
9. ABCDE

10.
https://en.wikipedia.org/wiki/Readers%E2%80%93writers_problem

third readers-writers problem


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※ 編輯: tzutengweng (59.125.97.119), 01/03/2017 21:46:40
※ 編輯: tzutengweng (59.125.97.119), 01/03/2017 21:47:32
推 jjjjjjjk92: 第五題sll 應該是乘2吧?
→ jjjjjjjk92: 要改srl?
※ 編輯: tzutengweng (59.125.97.119), 01/03/2017 22:41:07
推 howard31622: 第八題錯了吧
推 exilelast: 第6題b錯喔
→ exilelast: Segmentation fault 是指memory violation