int ArraySum(int *array, int n){int t = 0;for(int i=0; i<n; ++i) t += array[i];return t;
}int main() {int a[5] = {1, 2, 3, 4, 5 };int sum = ArraySum(a, 5);return sum;
}

ArraySum:pushl    %ebpmovl    %esp, %ebp   subl    $16, %esp  //分配16字节栈空间movl    $0, -8(%ebp)  //初始化tmovl    $0, -4(%ebp)  //初始化ijmp    .L2
.L3:movl    -4(%ebp), %eaxsall    $2, %eax  //i<<2, 即i*4, 一个int占4字节addl    8(%ebp), %eax  //得到array[i]地址，array+i*4movl    (%eax), %eax   //array[i]addl    %eax, -8(%ebp) //t+=array[i]addl    $1, -4(%ebp)
.L2:movl    -4(%ebp), %eax   cmpl    12(%ebp), %eax  //比较i<njl    .L3movl    -8(%ebp), %eax //return t; 默认eax存函数返回值leaveretmain:
.LFB1:pushl    %ebpmovl    %esp, %ebpsubl    $40, %esp       movl    $1, -24(%ebp) //初始化a[0]movl    $2, -20(%ebp) //初始化a[1]movl    $3, -16(%ebp) //初始化a[2]movl    $4, -12(%ebp) //初始化a[3]movl    $5, -8(%ebp)   //初始化a[4]movl    $5, 4(%esp)    //5作为第二个参数传给 ArraySumleal    -24(%ebp), %eax  //leal产生数组a的地址movl    %eax, (%esp)   //作为第一个参数传给ArraySumcall    ArraySummovl    %eax, -4(%ebp)  //返回值传给summovl    -4(%ebp), %eax  //return sumleaveret

struct Point{int x;int y;
};
void PointInit(struct Point *p, int x, int y){p->x = x;p->y = y;
}int main() {struct Point p;int x = 10;int y = 20;PointInit(&p, x, y);return 0;
}

PointInit:pushl    %ebpmovl    %esp, %ebpmovl    8(%ebp), %eax    //p的地址movl    12(%ebp), %edx  //xmovl    %edx, (%eax)      //p->x=xmovl    8(%ebp), %eaxmovl    16(%ebp), %edx  //ymovl    %edx, 4(%eax)    //p->y=ypopl    %ebpretmain:pushl    %ebpmovl    %esp, %ebpsubl    $28, %espmovl    $10, -8(%ebp)  //x=10movl    $20, -4(%ebp)  y=20movl    -4(%ebp), %eaxmovl    %eax, 8(%esp)movl    -8(%ebp), %eaxmovl    %eax, 4(%esp)leal    -16(%ebp), %eax  //取p地址&pmovl    %eax, (%esp)call    PointInitmovl    $0, %eaxleaveret

080483b4 <ArraySum>:80483b4:    55                       push   %ebp80483b5:    89 e5                    mov    %esp,%ebp80483b7:    83 ec 10                 sub    $0x10,%esp80483ba:    c7 45 f8 00 00 00 00     movl   $0x0,-0x8(%ebp)80483c1:    c7 45 fc 00 00 00 00     movl   $0x0,-0x4(%ebp)80483c8:    eb 12                    jmp    80483dc <ArraySum+0x28>80483ca:    8b 45 fc                 mov    -0x4(%ebp),%eax80483cd:    c1 e0 02                 shl    $0x2,%eax80483d0:    03 45 08                 add    0x8(%ebp),%eax80483d3:    8b 00                    mov    (%eax),%eax80483d5:    01 45 f8                 add    %eax,-0x8(%ebp)80483d8:    83 45 fc 01              addl   $0x1,-0x4(%ebp)80483dc:    8b 45 fc                 mov    -0x4(%ebp),%eax80483df:    3b 45 0c                 cmp    0xc(%ebp),%eax80483e2:    7c e6                    jl     80483ca <ArraySum+0x16>80483e4:    8b 45 f8                 mov    -0x8(%ebp),%eax80483e7:    c9                       leave  80483e8:    c3                       ret