C 循环结构的执行效率分析

学逆向的2026-10-17 22:23

c 复制代码

    int i = 0;
00007FF60510185C  mov         dword ptr [i],0  
    while (i <= 10){
00007FF605101863  cmp         dword ptr [i],0Ah  
00007FF605101867  jg          main+43h (07FF605101883h)  
        printf("%d ", i);
00007FF605101869  mov         edx,dword ptr [i]  
00007FF60510186C  lea         rcx,[string "%d " (07FF605109C24h)]  
00007FF605101873  call        printf (07FF605101253h)  
00007FF605101878  nop  
        i++;
00007FF605101879  mov         eax,dword ptr [i]  
00007FF60510187C  inc         eax  
00007FF60510187E  mov         dword ptr [i],eax  
    }
00007FF605101881  jmp         main+23h (07FF605101863h)  
    i = 0;
00007FF605101883  mov         dword ptr [i],0  
    do {
        printf("%d ", i);
00007FF60510188A  mov         edx,dword ptr [i]  
00007FF60510188D  lea         rcx,[string "%d " (07FF605109C24h)]  
00007FF605101894  call        printf (07FF605101253h)  
00007FF605101899  nop  
        i++;
00007FF60510189A  mov         eax,dword ptr [i]  
00007FF60510189D  inc         eax  
00007FF60510189F  mov         dword ptr [i],eax  

    } while (i <= 10);
00007FF6051018A2  cmp         dword ptr [i],0Ah  
00007FF6051018A6  jle         main+4Ah (07FF60510188Ah)  
    for (i = 0;i <= 10;i++) {
00007FF6051018A8  mov         dword ptr [i],0  
00007FF6051018AF  jmp         main+79h (07FF6051018B9h)  
00007FF6051018B1  mov         eax,dword ptr [i]  
00007FF6051018B4  inc         eax  
00007FF6051018B6  mov         dword ptr [i],eax  
00007FF6051018B9  cmp         dword ptr [i],0Ah  
00007FF6051018BD  jg          main+91h (07FF6051018D1h)  
        printf("%d ", i);
00007FF6051018BF  mov         edx,dword ptr [i]  
00007FF6051018C2  lea         rcx,[string "%d " (07FF605109C24h)]  
00007FF6051018C9  call        printf (07FF605101253h)  
00007FF6051018CE  nop  
    }
00007FF6051018CF  jmp         main+71h (07FF6051018B1h)

循环效率的比较

1.从反汇编代码的行数来看，for循环最慢，while循环和do-while循环较快

2.while循环和do-while循环在结构上较为清晰，执行速度较快

3.do-while循环的执行效率最高，适用于简单和通用的循环场景