# zyantific/zydis

Fast and lightweight x86/x86-64 disassembler and code generation library

Repository: https://github.com/zyantific/zydis
Canonical: https://ross.abutalabs.com/products/zydis
Homepage: https://zydis.re
Language: C
License: MIT
License Family: permissive
Topics: disassembler, intel, amd, x86-64, codegen, c, x86
Last push: 2026-07-27T13:04:16+00:00

## Health v2 (maintenance only)
Score: 65/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 94, release rhythm 8, longevity 100
- inputs: {"age_days": 4331, "days_push": 37, "days_rel": 564, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4351, forks 509 (observed 2026-08-28T04:08:46.281948+00:00)

## What it is
Zydis is a fast, lightweight x86/x86-64 disassembler and encoder library written in C with zero dependencies, not even libc. It supports all Intel and AMD ISA extensions, is thread-safe, performs no dynamic memory allocation, and is used by major projects like Firefox, WebKit, and x64dbg.

## Use cases
- disassemble x86-64 machine code in my application
- decode instructions for a debugger or profiler
- encode x86 instructions programmatically
- embed a disassembler in a kernel driver or UEFI environment
- analyze instruction register and flag access
- build a binary analysis or reverse-engineering tool

## When to choose
- you need complete, correct x86/x86-64 ISA coverage including the latest extensions
- you need a dependency-free, small-footprint library usable in kernel mode or UEFI
- performance matters and you want fast decoding with rich per-instruction metadata
- you need both disassembly and encoding in one library

## When to avoid
- you need disassembly for non-x86 architectures like ARM or RISC-V
- you want a high-level decompiler or disassembly framework with control-flow analysis rather than a raw decoding library
- your project is not C/C++ and you cannot use bindings

## Facets
- artifact type: library
- maturity: active
- function: parser, developer-tools, reverse-engineering
- domain: developer-tools, security, reverse-engineering, operating-systems
- platform: cross-platform, cpp, c, windows, embedded
- tags: disassembler, x86, x86-64, encoder, instruction-decoding, no-dependencies, kernel-mode, binary-analysis, linux, macos

## Member repositories
- zyantific/zydis (main) score 65

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:46.281948+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 2026-08-29T18:21:32.251074+00:00, confidence not recorded.
  - readme: https://github.com/zyantific/zydis (fetched 2026-08-28T04:08:46.281948+00:00, sha fbccedd7db69)
  - homepage: https://zydis.re (fetched 2026-08-29T09:10:13.665900+00:00, sha 25670c9feb01)
- Data as of 2026-08-30T08:39:29.467469+00:00.