You're reading from LLVM Code Generation A deep dive into compiler backend development

Product type Paperback

Published in May 2025

Publisher Packt

ISBN-13 9781837637782

Length 620 pages

Edition 1st Edition

Languages

C++

Tools

LLVM

Concepts

Programming Language

Author (1):

Quentin Colombet

View More author details

Table of Contents (30) Chapters

Preface

1. Part 1: Getting Started with LLVM

2. Building LLVM and Understanding the Directory Structure FREE CHAPTER

3. Contributing to LLVM

4. Compiler Basics and How They Map to LLVM APIs

5. Writing Your First Optimization

6. Dealing with Pass Managers

7. TableGen – LLVM Swiss Army Knife for Modeling

8. Part 2: Middle-End: LLVM IR to LLVM IR

9. Understanding LLVM IR

10. Survey of the Existing Passes

11. Introducing Target-Specific Constructs

12. Hands-On Debugging LLVM IR Passes

13. Part 3: Introduction to the Backend

14. Getting Started with the Backend

15. Getting Started with the Machine Code Layer

16. The Machine Pass Pipeline

17. Part 4: LLVM IR to Machine IR

18. Getting Started with Instruction Selection

19. Instruction Selection: The IR Building Phase

20. Instruction Selection: The Legalization Phase

21. Instruction Selection: The Selection Phase and Beyond

22. Part 5: Final Lowering and Optimizations

23. Instruction Scheduling

24. Register Allocation

25. Lowering of the Stack Layout

26. Getting Started with the Assembler

27. Unlock Your Book’s Exclusive Benefits

28. Other Books You May Enjoy

29. Index

Your turn

To help you solidify your understanding of what you learned throughout this chapter, we prepared two exercises that will put you to the test.

In the first one, you will create a pass with both the legacy pass manager and the new pass manager.

In the second, you will also interact with both managers, but this time, you will create a pass pipeline that can produce logging information.

Writing your own pass

For this exercise, you will have to produce two implementations: one for the legacy pass manager, where you will fill in the blanks for a function called createYourTurnPassForLegacyPM, located in ch5/your_first_pass/your_turn/passWithLegacyPM.cpp, and one for the new pass manager, where you will have to implement the class called YourTurnConstantPropagationNewPass declared in ch5/your_first_pass/your_turn/passWithNewPM.h and whose implementation should live in ch5/your_first_pass/your_turn/passWithNewPM.cpp.

Note

The pointer that you hand...