散列文件重定位：rw段的复制函数，函数内的变量和传参变量不一样，还能能够执行

[yuwuyong]

void memcpy(void * dest, void * src, unsigned int len)
{
unsigned char * pcDest;
unsigned char * pcSrc;
// pcDest =(unsigned char * )dest;
//pcSrc = (unsigned char * )src;
while(len --)

{
    *pcDest = * pcSrc;
    pcSrc++;
    pcDest++;
}

}

问题：
// pcDest =(unsigned char * )dest; //pcSrc = (unsigned char * )src;这两句注释掉，汇编调用这个C函数也是可以正确执行，有点不理解。