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[ת]±ä̬֮MEMCPY void* mymemcpy( void* dest, const void* src, size_t count ) {     char* d = (char*)dest;     const char* s = (const char*)src;     int n = (count + 7) / 8; // count > 0 assumed     switch( count & 7 )     {     case 0:  do {  *d++ = *s++;     case 7:        *d++ = *s++;     case 6:        *d++ = *s++;     case 5:        *d++ = *s++;     case 4:        *d++ = *s++;     case 3:        *d++ = *s++;     case 2:        *d++ = *s++;     case 1:        *d++ = *s++;                } while (--n > 0);     }     return dest; } ÕâÑùÒ²ÐУ¬ÕæÊdz¤¼ûʶÁË~_~ int n = (count + 7) / 8;¼ÆËãÒª¸´ÖƵÄÂÖÊý£¨Ã¿ÂÖ¸´ÖÆ8룩£¬Ê£ÏµÄÓàÊýλÊýÒ²Òª¸´ÖƽøÈ¥¡£ count & 7¿ØÖÆÒª¸´ÖÆÓàÊýλÊý£¬while (--n > 0)¿ØÖÆÂÖÊý¡£ ±ÈÈçcount = 9£¬Ôòn = 2£¬count & 7  = 1£¬Òª¸´ÖÆ2ÂÖ£¬³ÌÐòÌøµ½case1Ö´ÐУ¬¸´ÖÆһλ֮ºó£¬ÔÙÑ­»·Ò»ÂÖ£¬¸´ÖÆ8λ    Êղؠ  ·ÖÏí   ¶¥(0)

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