This is a Lux Industries fork of the canonical upstream:

• Upstream: https://github.com/chfast/intx
• Pinned commit: dada8df
• Pinned tag: v0.15.0
• License: Apache-2.0 (preserved from upstream — see LICENSE, modifications log in NOTICE)
• Lux extensions: NONE (verbatim parity with upstream). Header-only extended-precision integer C++ library used by luxcpp/crypto for Montgomery arithmetic in bn254/, secp256r1/, modexp/, evm256/, kzg/.
• Tag policy: track upstream semver verbatim. Divergence (if ever required) signaled by next-minor bump, NOT prerelease suffixes.

High‑performance multiprecision integer library for C++

The intx header-only C++20 library provides allocation-free extended precision integer types. They are implemented as arrays of std::uint64_t words and closely match the behavior of built-in types.

To build, test or benchmark.

git clone https://github.com/chfast/intx
cd intx

cmake -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build --parallel

build/test/intx-unittests
build/test/intx-bench

Paweł Bylica @chfast

Licensed under the Apache License, Version 2.0.