There are several detailed tutorials[1] on writing an LLVM pass so that I won’t cover it in much detail. However, as of today(May 2020), there is no detailed guide on registering an LLVM pass within the OPT and Clang toolchains. So, this post will be mainly regarding that. Content: Introduction Types of LLVM passes Writing a basic function pass in LLVM Registering a pass within the OPT toolchain Clang toolchain Introduction LLVM is an extremely modular compiler infrastructure that provides back-end tools for code optimization and transformation. It works on an intermediate representation called LLVM IR. Clang, on the other…
