207   unsigned sum = 0;  in checksum()  local
212       sum += *(unsigned*)z;  in checksum()
219       sum += __builtin_bswap32(*(unsigned*)z);  in checksum()
224       sum += _byteswap_ulong(*(unsigned*)z);  in checksum()
235       sum  += ((unsigned)z[3] + z[7] + z[11]+ z[15]);  in checksum()
243       sum  += z[3];  in checksum()
247     sum += (sum2 << 8) + (sum1 << 16) + (sum0 << 24);  in checksum()
251     case 3:   sum += (z[2] << 8);  in checksum()
252     case 2:   sum += (z[1] << 16);  in checksum()
253     case 1:   sum += (z[0] << 24);  in checksum()
256   return sum;  in checksum()