c - 将 C 代码转换为 MIPS 汇编代码

Question

我希望将以下代码翻译为 MIPS 汇编语言。我该如何翻译它？或者这样做有什么问题吗？

#include <stdio.h>

int main()
{
   int n, sum = 0, remainder;

   printf("Enter an integer\n");
   scanf("%d",&n);

   while(n != 0)
   {
      remainder = n % 10;
      sum = sum + remainder;
      n = n / 10;
   }

   printf("Sum of digits of entered number = %d\n",sum);

   return 0;
}

Answer 1

使用 gcc 将其翻译成这样的内容:

  4007a0 <main>:
  4007a0:   3c040040    lui a0,0x40
int main() {
  4007a4:   27bdffd8    addiu   sp,sp,-40
  4007a8:   afbf0024    sw  ra,36(sp)
   int n, sum = 0, remainder;
   printf("Enter an integer\n");
  4007ac:   0c10018c    jal 400630 <puts@plt>
  4007b0:   248408b8    addiu   a0,a0,2232
   scanf("%d",&n);
  4007b4:   3c040040    lui a0,0x40
  4007b8:   248408cc    addiu   a0,a0,2252
  4007bc:   0c10017c    jal 4005f0 <scanf@plt>
  4007c0:   27a50018    addiu   a1,sp,24
   while(n != 0)
  4007c4:   8fa20018    lw  v0,24(sp)
  4007c8:   10400017    beqz    v0,400828 <main+0x88>
  4007cc:   3c036666    lui v1,0x6666
  4007d0:   00002821    move    a1,zero
   {
      remainder = n % 10;
  4007d4:   24636667    addiu   v1,v1,26215
  4007d8:   00430018    mult    v0,v1
  4007dc:   000227c3    sra a0,v0,0x1f
  4007e0:   00004810    mfhi    t1
  4007e4:   00093083    sra a2,t1,0x2
  4007e8:   00c42023    subu    a0,a2,a0
  4007ec:   00043840    sll a3,a0,0x1
  4007f0:   000430c0    sll a2,a0,0x3
  4007f4:   00e63021    addu    a2,a3,a2
  4007f8:   00463023    subu    a2,v0,a2
      sum = sum + remainder;
  4007fc:   00a62821    addu    a1,a1,a2
  400800:   1480fff5    bnez    a0,4007d8 <main+0x38>
  400804:   00801021    move    v0,a0
  400808:   afa00018    sw  zero,24(sp)
   }
   printf("Sum of digits of entered number = %d\n",sum);
  40080c:   3c040040    lui a0,0x40
  400810:   0c100188    jal 400620 <printf@plt>
  400814:   248408d0    addiu   a0,a0,2256
   return 0;
}
  400818:   8fbf0024    lw  ra,36(sp)
  40081c:   00001021    move    v0,zero
  400820:   03e00008    jr  ra
  400824:   27bd0028    addiu   sp,sp,40