# llvm/circt

Circuit IR Compilers and Tools

Repository: https://github.com/llvm/circt
Canonical: https://ross.abutalabs.com/products/circt
Homepage: https://circt.org
Language: C++
License: NOASSERTION
License Family: other
Topics: circt, llvm, mlir
Last push: 2026-08-26T19:14:02+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 2372, "days_push": 7, "days_rel": 11, "gap_med": 6.0, "n_releases_24m": 91}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2226, forks 504 (observed 2026-08-28T04:06:28.797356+00:00)

## What it is
CIRCT (Circuit IR Compilers and Tools) is an LLVM/MLIR-based infrastructure project for building hardware design compilers and tools. It provides modular intermediate representations and libraries for hardware description languages like Verilog, VHDL, and FIRRTL.

## Use cases
- compile hardware description languages like Verilog and FIRRTL through MLIR-based IRs
- build custom EDA tools on reusable compiler infrastructure
- translate between hardware design formats and IRs
- analyze and transform circuit designs programmatically
- prototype new hardware compiler passes and dialects
- run SystemC and RTL-level design flows

## When to choose
- you need modern, modular compiler infrastructure for hardware design
- you want to build custom tools on top of MLIR for circuits
- you are working with FIRRTL, Chisel, or SystemVerilog flows
- you need better location tracking and IR design than Verilog-based toolchains offer

## When to avoid
- you need a mature, production-verified synthesis or simulation tool today
- you want a turnkey EDA suite rather than compiler libraries
- you are not comfortable with experimental, fast-moving LLVM/MLIR-based projects

## Facets
- artifact type: framework
- maturity: active
- function: compiler, parser, interpreter, developer-tools
- domain: compilers, hardware, developer-tools, simulation
- platform: windows, cpp
- tags: mlir, llvm, hardware-design, eda, verilog, firrtl, circuit-ir, systemc, linux, macos

## Member repositories
- llvm/circt (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:28.797356+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:44:53.418434+00:00, confidence not recorded.
  - readme: https://github.com/llvm/circt (fetched 2026-08-28T04:06:28.797356+00:00, sha ee3579749a04)
  - homepage: https://circt.org (fetched 2026-08-29T10:25:20.707669+00:00, sha 44136fa355b3)
- Data as of 2026-08-30T08:39:29.467469+00:00.