xbyak ☆
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Description:
C++ JIT assembler for x86 (IA32), x64 (AMD64, x86-64)
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Developer tools
Tags: jit assembler c-plus-plus x86 assembly header-only
Install: brew install xbyak
About:
Xbyak is a header-only C++ library that provides a JIT assembler for generating machine code on the fly. It allows developers to write assembly instructions using an intuitive, high-level C++ API, which are then assembled into executable memory at runtime. This enables highly optimized code paths tailored to specific CPU capabilities, such as AVX or AVX-512.
Key Features:
  • Header-only library, no compilation required
  • Supports x86 (IA32), x64 (AMD64), and AVX/AVX-512 instructions
  • Intuitive C++ class-based API for defining instructions
  • Cross-platform support (Windows, macOS, Linux)
Use Cases:
  • Creating high-performance math libraries (e.g., matrix multiplication)
  • Implementing dynamic dispatch for CPU-specific optimized kernels
  • Building custom virtual machines or interpreters
  • Rapid prototyping of assembly algorithms
Alternatives:
  • AsmJit – AsmJit is a more feature-rich alternative with support for more architectures and advanced optimization passes, but Xbyak is often preferred for its simplicity and lightweight nature.
  • LLVM JIT – LLVM provides a full compiler infrastructure with heavy optimizations, whereas Xbyak is a lightweight assembler focused purely on generating machine code.
Version History
Detected Version Rev Change Commit
Nov 11, 2024 10:36am 0 VERSION_BUMP a1b181db
Nov 11, 2024 10:16am 0 VERSION_BUMP 3724ce40
Oct 31, 2024 1:16am 0 VERSION_BUMP c4429922
Oct 29, 2024 11:28pm 0 VERSION_BUMP e512bab5
Oct 13, 2024 9:54am 0 VERSION_BUMP c5071d9c
Oct 11, 2024 1:24am 0 VERSION_BUMP b6f6c208
Oct 8, 2024 9:55am 0 VERSION_BUMP 034897d5
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