rules ll delivers an upstream Clang/LLVM toolchain designed for heterogeneous C and C++ development, enabling developers to compile and optimize code across diverse hardware architectures. The platform integrates the latest LLVM front‑ends with custom back‑ends, providing seamless support for mixed CPU‑GPU and accelerator targets in a single build flow.
Funding
Funding not disclosed
Founders
Product
Problem
Developers targeting heterogeneous systems must manage multiple compiler toolchains and intricate cross‑compilation configurations to generate code for CPUs, GPUs, and specialized accelerators. This fragmentation increases build complexity, introduces compatibility errors, and slows iteration cycles for performance‑critical C and C++ projects.
Solution
rules_ll offers an upstream Clang/LLVM toolchain that unifies the latest LLVM front‑ends with custom back‑ends for a wide range of hardware targets. The platform enables a single source code base to be compiled and optimized for mixed CPU‑GPU and accelerator architectures within one build flow. By integrating heterogeneous back‑ends directly into the LLVM pipeline, it eliminates the need for separate compilers or manual toolchain switching. The toolchain automates cross‑compilation steps, preserving consistent optimization passes and diagnostic behavior across all targets. Developers can therefore reduce build‑system complexity, improve code portability, and accelerate performance tuning for multi‑architecture applications.
Target Audience
Primary users are C and C++ developers building high‑performance or compute‑intensive applications that run on heterogeneous hardware, such as HPC engineers, embedded system programmers, and AI/graphics developers.
Features
- Upstream Clang front‑end combined with custom LLVM back‑ends for GPUs, FPGAs, and other accelerators
- Single‑command build process that produces binaries for mixed CPU‑GPU targets without separate toolchains
- Consistent LLVM optimization pipeline applied uniformly across all supported architectures
- Integrated cross‑compilation support with automatic target selection and linking
- Compatibility with standard C/C++ build systems (Make, CMake, Ninja) and existing LLVM tooling