讀 clock 的程式片段如下：
inline unsigned long long int rdtsc()
{
    unsigned long long int x;
      asm   volatile ("rdtsc" : "=A" (x));
    return x;
}



使用範例：
	begin=rdtsc();
	
	...
	要測時間的 operation
	...
	
	end=rdtsc();
	
	clock=(end-begin);  ← 即可讀出此 operation 用了多少個 clock cycles
	
	



讀入 ip lookup table 的範例程式如下：
void read_table(char *str,unsigned int *ip,int *len)
{
        char tok[]="./";
        char buf[100],*str1;
        unsigned int n[4];
        sprintf(buf,"%s\0",strtok(str,tok));
        n[0]=atoi(buf);
        sprintf(buf,"%s\0",strtok(NULL,tok));
        n[1]=atoi(buf);
        sprintf(buf,"%s\0",strtok(NULL,tok));
        n[2]=atoi(buf);
        sprintf(buf,"%s\0",strtok(NULL,tok));
        n[3]=atoi(buf);
        str1=(char *)strtok(NULL,tok);
        if(str1!=NULL){
                sprintf(buf,"%s\0",str1);
                *len=atoi(buf);
        }
        else{
                if(n[1]==0&&n[2]==0&&n[3]==0)
                        *len=8;
                else
                        if(n[2]==0&&n[3]==0)
                                *len=16;
                        else
                                if(n[3]==0)
                                        *len=24;
                                }
        *ip=n[0];
        *ip<<=8;
        *ip+=n[1];
        *ip<<=8;
        *ip+=n[2];
        *ip<<=8;
        *ip+=n[3];
}