CRC计算性能分析

#define COUNT 100000
#define SIZE 1024

__u16 crc_itu_T_Byte(__u16 crc,const __u8 data)
{
   return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
}

__u16 gCrc16(__u16 crc,const __u8 *buffer,__u32 len)
{
   while((len > 0) && (buffer != NULL))
   {
      crc = crc_itu_T_Byte(crc,*buffer);
      buffer = buffer + 1;

      len = len - ;
   }

   return crc;
}

old_tv tv_sec 4404 tv_usec 74838
tv tv_sec 4409 tv_usec 856335
tv_usec 5781497

CFLAGS := -O2

__u16 gCrc16(__u16 crc,1)">while(len > 0)
   {
      crc = crc_itu_T_Byte(crc,1)">4487 tv_usec 7172174488 tv_usec 647959930742

inline __u16 gCrc16(__u16 crc,1)"> crc;
}

WORD LibCrc16_2(const BYTE *pbyData,DWORD dwSizE)
{
   WORD wCRC = 0x0000;
   DWORD dwIndex;
   WORD wValue;
   DWORD dwLen = (dwSize >> 1) << ;

   for(dwIndex = 0; dwIndex < dwLen; dwIndex += 2)
   {
      wValue = pbyData[dwIndex] << 8 | pbyData[dwIndex + ];
      wCRC = g_wLibCrc16_2_Table[wCRC ^ wValue];
   }

   dwLen = dwSize % if(dwLen == )
   {
      wCRC = (wCRC << 8) ^ g_wLibCrc16Table[((wCRC >> 8) & 0xff) ^ pbyData[dwSize - ]];
   }

    wCRc;
}