OpenVMS MACRO-32 Porting and User's Guide

This document, the OpenVMS MACRO-32 Porting and User's Guide (AA-PV64D-TE), provides essential instructions and methodologies for software engineers to port VAX MACRO applications to the OpenVMS Alpha system. It details the features of the MACRO-32 compiler, differences between the VAX assembler and the Alpha compiler, and provides a systematic, step-by-step porting methodology. Key topics covered include managing routine calls and declarations, handling register usage and entry points, recommended source code modifications to address VAX/Alpha architectural differences, performance optimization strategies (such as alignment and branch prediction), and programming support for 64-bit addressing. The guide also includes detailed references for compiler qualifiers, directives, and built-in functions to assist in the migration process.