# llvm ## Basic idea Modular compiler infrastructure (formerly "Low Level Virtual Machine") used as a back-end by Clang, Rust, Swift, Julia, and many others. The defining abstraction is a typed, SSA-based intermediate representation. ## Key facts * IR: typed, SSA form, three-address. * Pass pipeline: front-end → IR → passes (analysis + transform) → back-end → target machine code. * Clang, MLIR, Cranelift, llgo all build on LLVM. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://isubasinghe.gitbook.io/isithas-wiki/software_engineering/frameworks/llvm.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.