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 HP-UX 64-bit Porting and Transition Guide: HP 9000 Computers

Chapter 3 HP-UX 64-bit Porting Concepts
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Table of Contents

ILP32 and LP64 Data Models
Data Type Sizes
ILP32 to LP64 Porting Concerns
Data Truncation
Pointers
Data Type Promotion
Data Alignment and Data Sharing
Constants
Bit Fields
Bit Shifts and Bit Masks
Enumerated Types
Architecture Specific Changes
Assembly Language
Object File Format
Procedure Calling Conventions
HP-UX 64-bit Performance Considerations
What Impacts Performance in 64-bit Applications
Tuning Your 64-bit Application

This chapter describes porting concerns of the HP-UX 64-bit data model and performance considerations when transitioning to 64-bit platforms.

The following topics are included:

  • The ILP32 and LP64 data models

  • ILP32 to LP64 porting concerns

  • Architecture-specific changes

  • HP-UX 64-bit performance considerations



32-bit and 64-bit Application Interoperability
  		 


ILP32 and LP64 Data Models  
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