LLVMn

LLVMn is a fictional extension of the LLVM compiler infrastructure used here to illustrate a representative model of a modular, extensible compiler project. It introduces a redesigned intermediate representation called NIR and emphasizes fine-grained modularity, enabling researchers and language implementers to assemble custom pipelines without altering core code. The project aims to be compatible with the LLVM ecosystem while providing a separate, pluggable pass manager and backend generator.

At its core, LLVMn provides a core IR, a configurable pass pipeline, and a backend abstraction capable of targeting CPUs, GPUs, and specialized accelerators. NIR is designed to be extensible, supporting custom analyses and transformations through isolated passes. It supports both ahead-of-time and just-in-time compilation and includes a translation pathway to interoperate with traditional LLVM IR when needed. The optimizer suite features loop transformations, vectorization, memory-access analyses, and interprocedural optimizations tailored for heterogeneous architectures. Debugging and profiling tooling are integrated into the pipeline to aid optimization.

Frontends for several languages are developed by the community, with interoperability to export and import LLVM IR. The tooling set includes an optimizer tool, a linker, a runtime library, and a simulator or emulator for testing targets. LLVMn emphasizes reproducible builds and aims for deterministic optimization results.

Development is community-driven, governed by an open-source license and a contributor model similar to LLVM's. Adoption is primarily in academic and experimental compiler projects, with growing interest from language implementers seeking modular backends and rapid experimentation.