A LLVM Workshop will be held at CGO 2015. If you are interested in attending the workshop, please register at the CGO website.

Topic Overview

• High-level overview of LLVM & Clang
• Will include how to get started coding on LLVM & Clang
• Overview of core design elements, data structures, APIs, and patterns used in the codebase
• High-level testing strategy for LLVM & Clang using tools like Clang’s ‘-verify’, opt, llc, FileCheck, and GoogleTest
• Process of submitting a patch, code review, and community interactions
• How to add an optimization pass to LLVM
• Tutorial on the LLVM IR both in the abstract and at the level of internal APIs
• Basic APIs and data structures needed to implement, test, and wire a new pass into the compiler.
• Overview of the relationship between transform and analysis passes.
• Overview of the different kinds of transformation passes, how they interact, and what they can and can’t do
• Actually add a transformation pass and an analysis pass to the compiler that depend on each other and exercise this machinery.
• Includes authoring relevant tests for each component
• High-level overview of the architecture of an LLVM backend, with an emphasis on modifying or enhancing existing backends rather than adding a new one
• Detailed review of where things are: from SelectionDAG to FastISel to the register allocator
• Detailed review of exactly how a backend’s tablegen works, and how to make changes there and debug things