RtlLargeIntegerArithmeticShift

LARGE_INTEGER
    RtlLargeIntegerArithmeticShift(
        IN LARGE_INTEGER  LargeInteger,
        IN CCHAR  ShiftCount
        );

RtlLargeIntegerArithmeticShift is exported to support existing driver binaries and is obsolete. For better performance, use the compiler support for 64-bit integer operations.