User`s guide

MACRO Support for 64-Bit Addressing

This chapter describes the 64-bit addressing support provided by the MACRO

compiler and associated components.

This chapter contains the following topics:

• Section 5.1, Components for 64-Bit Addressing

• Section 5.2, Passing 64-Bit Values

• Section 5.3, Declaring 64-Bit Arguments

• Section 5.4, Specifying 64-Bit Address Arithmetic

• Section 5.5, Sign-Extending and Checking

• Section 5.6, Alpha Instruction Built-ins

• Section 5.7, Calculating Page-Size Dependent Values

• Section 5.8, Creating and Using Buffers in 64-Bit Address Space

• Section 5.9, Coding for Moves Longer Than 64 KB

5.1 Components for 64-Bit Addressing

The MACRO compiler provides components that support 64-bit addressing.

You should limit the use of 64-bit addressing to code that you have ported to

OpenVMS Alpha or OpenVMS I64. For any new development on OpenVMS

Alpha or OpenVMS I64, HP recommends the use of higher-level languages.

You should make 64-bit addressing explicit in your code, using qualiﬁers, macros,

directives, and built-ins that are provided to let you produce code that is reliable

and easy to maintain.

Table 5–1 shows the components that provide MACRO programming support for

64-bit addressing.

MACRO Support for 64-Bit Addressing 5–1