Chapter 9: Instruction Selection
The LLVM IR used so far still needs to be turned into machine instructions. This is called instruction selection, often abbreviated to ISel. Instruction selection is an important part of the target backend, and LLVM has three different approaches for selecting instructions: the selection DAG, fast instruction selection, and global instruction selection.
In this chapter, you will learn the following topics:
- Understanding the LLVM target backend structure, which introduces you to the task performed by the target backend, and you examine the machine passes to run.
- Using the machine IR (MIR) to test and debug the backend, which helps you to output MIR after a specified pass and run a pass on the MIR file.
- How instruction ...
Get Learn LLVM 12 now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
