+ or |

long x =
( ( long ) EighthByte << 56 )
+ ( ( long ) SeventhByte << 48 )
+ ( ( long ) SixthByte << 40 )
+ ( ( long ) FifthByte << 32 )
+ ( ( long ) FourthByte << 24 )
+ ( ( long ) ThirdByte << 16 )
+ ( ( long ) SecondByte << 8 )
+ FirstByte;

// OR:

long x =
( ( long ) EighthByte << 56 )
| ( ( long ) SeventhByte << 48 )
| ( ( long ) SixthByte << 40 )
| ( ( long ) FifthByte << 32 )
| ( ( long ) FourthByte << 24 )
| ( ( long ) ThirdByte << 16 )
| ( ( long ) SecondByte << 8 )
| ( long ) FirstByte;