libsycl

libsycl/ is an implementation of the SYCL 2020 runtime library. SYCL is a Khronos C++ programming model for heterogeneous compute (CPUs, GPUs, FPGAs); libsycl is the host-side runtime that backs it.

Purpose

Per libsycl/README.md:

The libsycl subproject is an implementation of the SYCL runtime library as defined by the SYCL 2020 specification. libsycl runtime library and headers require C++17 support or higher.

The subproject is young at the time of this snapshot — README.md lists "How to use libsycl with Clang" and "How to build" as TODOs. Treat the directory as actively under construction; the long-term goal is a SYCL implementation aligned with the rest of the LLVM toolchain.

Directory layout

libsycl/
├── include/        # Public SYCL headers
├── lib/            # Implementation
├── docs/
├── cmake/
├── test/
├── README.md
└── LICENSE.TXT

Integration points

• Offload (offload) — the lower layer that handles device discovery, kernel launch, and memory transfer.
• Clang — SYCL kernels are typically compiled by Clang's SYCL device pipeline.
• OpenMP runtime (openmp) and GPU libc (libc) cooperate with libsycl on supported platforms.

Entry points for modification

The subproject is small — see libsycl/lib/ for current implementation files. New work is best coordinated on Discourse before landing structural changes, since the subproject is still settling its public surface.

Reference

• libsycl/README.md
• SYCL 2020 specification