The 64-bit integer type is supported by allx86 as well as Alpha processors. Visual C++ includes the _ _int64 keyword to enable use of signed and unsigned 64-bit integers in your source code. In addition, on Alpha platforms, a number of intrinsic functions and run-time library functions support operations and data conversion involving 64-bit integers.
For more information on 64-bit integers, see the int64 topic in Chapter 5.