Writing an LLVM Pass (legacy PM version) — LLVM 21.0.0git documentationWarning This document deals with the legacy pass manager. LLVM uses the new pass manager for the optimization pipeline (the codegen pipeline still uses the legacy pass manager), which has its own way of defining passes. For more details, see Writing an LLVM Pass and Using the New Pass Manager. The LLVM Pass Framework is an important part of the LLVM system, because LLVM passes are where most of th
