llvm/llvm-project

📈 Trending★ 38,395LLVMAudience · developerComplexity · 5/5ActiveLicenseSetup · hard

Mindmap

mindmap
  root((LLVM Project))
    What it does
      Optimizes code
      Generates machine code
      Transforms source to IR
    Core components
      LLVM optimizer
      Clang frontend
      LLD linker
      libc++ library
    Use cases
      Build compilers
      Create languages
      Cross compilation
      Runtime optimization
    Tech stack
      C++
      LLVM IR
      Assembly
    Who uses it
      Language creators
      Apple Xcode
      Rust Swift Julia

mindmap root((LLVM Project)) What it does Optimizes code Generates machine code Transforms source to IR Core components LLVM optimizer Clang frontend LLD linker libc++ library Use cases Build compilers Create languages Cross compilation Runtime optimization Tech stack C++ LLVM IR Assembly Who uses it Language creators Apple Xcode Rust Swift Julia

Things people build with this

USE CASE 1

Build a new programming language compiler that generates fast, optimized machine code.

USE CASE 2

Optimize an existing language runtime by leveraging LLVM's code generation and optimization passes.

USE CASE 3

Create a cross-compiler for embedded systems or alternative CPU architectures.

USE CASE 4

Contribute compiler improvements to languages like Rust, Swift, or Kotlin that use LLVM as their backend.

Tech stack

C++LLVM IRAssembly

Getting it running

Difficulty · hard Time to first run · 1day+

LLVM requires building from source with CMake, takes 30min-2h to compile, and needs C++ toolchain; running meaningful examples requires understanding compiler internals.

Use freely for any purpose under the Apache 2.0 license with LLVM exceptions, allowing commercial use and modification with attribution.

In plain English

The LLVM Project is a large collection of modular, reusable compiler and toolchain technologies. At its core, LLVM provides the infrastructure that makes it possible to build optimizing compilers: a set of libraries and tools for transforming source code into machine code in a way that runs fast and uses memory efficiently. It is the foundation that powers many real-world programming language compilers and runtimes. The project has several major components. LLVM itself is the core optimizer and code generator: it takes programs expressed in a portable intermediate representation (a kind of simplified assembly language that is CPU-independent) and optimizes and translates them into machine code for specific processors. Clang is the C, C++, Objective-C, and Objective-C++ frontend, the part that reads your source code and converts it into LLVM's intermediate form. Other parts of the project include libc++ (a modern implementation of the C++ standard library), LLD (a fast linker that connects compiled object files into a runnable program), and many other tools for analyzing and transforming programs. You would encounter LLVM when working on or studying compilers, building a new programming language, optimizing an existing language's runtime, working on embedded systems that need a cross-compiler, or contributing to languages like Rust, Swift, Julia, or Kotlin that compile through LLVM. Apple uses LLVM as the foundation for the Xcode toolchain, and it is widely used in research and industry. The codebase is primarily written in C++ with some components in LLVM's own assembly language. It is an open-source project hosted as a monorepo on GitHub.

Copy-paste prompts

Prompt 1

How do I use LLVM to build a compiler for my own programming language? Walk me through the steps from source code to machine code.

Prompt 2

Show me how Clang converts C++ source code into LLVM's intermediate representation, and what optimizations LLVM applies before generating machine code.

Prompt 3

I want to create a cross-compiler for ARM using LLVM. What components do I need and how do I configure them?

Prompt 4

Explain how to write a custom LLVM pass to optimize a specific pattern in compiled code.

Prompt 5

How does the LLVM linker (LLD) work, and when would I use it instead of the system linker?

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Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.