Install alive2 with Homebrew, Nix

Project links

• Homepage
• Upstream docs
• Package manager page

Commands and aliases

• alive
• alive-exec
• alive-jobserver
• alive-tv
• quick-fuzz

Project history

The public Alive2 repository starts with an initial commit on 2018-06-09. Its README describes libraries for Alive2 IR, symbolic execution, LLVM-to-Alive2 IR conversion, refinement checking, and SMT abstraction, plus tools including an Alive drop-in replacement, alive-tv, alive-exec, and clang/opt translation-validation plugins.

The project positions itself as the successor in spirit to Alive for LLVM optimization reasoning, but with a broader toolkit around real LLVM IR and translation validation. The README points to the PLDI 2021 Alive2 paper for the technical introduction.

Alive2 tracks LLVM closely: its README says the latest Alive2 is intended to build against the latest LLVM main branch, and its later release tags use LLVM-version-like labels such as v19.0, v20.0, and v21.0.

Adoption history

Alive2 is used as an LLVM quality tool rather than a general application. The README says the maintainers run translation validation across LLVM IR-level transformation tests on LLVM main each day and publish results. The repository's BugList lists many LLVM and Z3 issues found by Alive2.

The project also has an online alive-tv instance, letting compiler developers try translation validation without building the local toolchain.

How it is used

Package users usually run alive-tv on source and target LLVM IR, wrap opt through Alive2's translation-validation scripts, or compile through alivecc/alive++ to validate IR-level transformations performed by clang. alive-exec is documented as an experimental UB-precise LLVM function interpreter.

The toolchain is intentionally low-level: it needs CMake, a C/C++ compiler, re2c, Z3, and often a matching LLVM build with RTTI and exceptions enabled.

Why package nerds care

Alive2 is notable in package-manager catalogs because it packages research-grade compiler verification as command-line tools. For LLVM-heavy users, installing alive-tv is a practical way to test optimizer correctness without assembling the whole research environment by hand.

It also depends on the exact moving edge of LLVM, which makes it a good example of a package whose value is tied to keeping versions and build flags aligned with upstream compiler development.

Timeline

• 2018: Public Git history begins with an initial commit.
• 2020: README example documents an LLVM release/10.x optimizer bug found by alive-tv.
• 2021: PLDI 2021 paper published as the project's technical introduction.
• 2024: v19.0 tag appears in the repository history.
• 2025: v21.0 tag appears in the repository history.

Related projects

• LLVM: primary compiler IR and optimization target.
• Z3: SMT solver dependency and one of the projects whose bugs are tracked in Alive2's BugList.
• Alive: earlier optimization-verification tool referenced by Alive2's drop-in replacement.

Sources

• Alive2 PLDI 2021 paper linked from README: https://web.ist.utl.pt/nuno.lopes/pubs/alive2-pldi21.pdf
• Git history from https://github.com/AliveToolkit/alive2.git
• Official Alive2 BugList: https://raw.githubusercontent.com/AliveToolkit/alive2/master/BugList.md
• Official Alive2 README: https://raw.githubusercontent.com/AliveToolkit/alive2/master/README.md