摘要：
— Built-in Function: int __builtin_ffs (unsigned int x)Returns one plus the index of the least significant 1-bit of x, or if x is zero, returns zero. 返回右起第一个‘1’的位置。— Built-in Function: int __builtin_clz (unsigned int x)Returns the number of leading 0-bits in x, starting at the most significant bit p 阅读全文
