RtlLargeIntegerAnd

VOID
    RtlLargeIntegerAnd(
        IN OUT LARGE_INTEGER  Result,
        IN LARGE_INTEGER  Source,
        IN LARGE_INTEGER  Mask
        );

RtlLargeIntegerAnd is exported to support existing driver binaries and is obsolete.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