统计8字节块中每字节中的1的个数，如果1的个数为偶数，那么就设置最低位为1使它成为奇数。
Count the number of ones in each byte of the 8-byte block; if the number of ones is even, make it odd by setting the least significant bit to one.
这就是说，在x86系统上，最低位字节(最小值)首先存储在ll的第一个字节中；在PowerArchitecture系统上，它们则存储到最后。
That is to say, on the x86 system, the least-significant byte (the smallest values) are stored in the first byte of ll; on the Power Architecture system, they're stored in the last.
Little - endian是将低位字节存储在内存的低地址中，将高位字节存储在内存的高地址中。
Little-endian means that the least significant byte is stored at the lowest memory address and the most significant byte is stored at the highest memory address.
Big -endian是将高位字节存储在内存的低地址中，将低位字节存储在内存的高地址中。
Big-endian means that the most significant byte is stored at the lowest memory address and the least significant byte is stored at the highest memory address.
Big -endian是将高位字节存储在内存的低地址中，将低位字节存储在内存的高地址中。
Big-endian means that the most significant byte is stored at the lowest memory address and the least significant byte is stored at the highest memory address.
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