rochus-keller / EiGen

C++11 cross-platform migration of the Eigen Compiler Suite backend

This project aims to develop a reusable cross-platform compiler backend for the i386, x86_64, ARM and AArch64 architectures based on the Eigen Compiler Suite (see https://ecs.openbrace.org/).

The original code is written in C++17 and doesn't compile with MSVC or old GCC versions.

The contribution of this project is the migration of a subset of the ECS code base to a conservative C++11 dialect, so it compiles on old GCC versions as well as on MSVC.

Yet another goal is to make the chibicc C compiler cross-platform (the original version depends on Posix) and generate ECS IR instead of AMD64.

Status on April 7, 2024

The source code of the cp*, *asm and linkbin tools has been successfully migrated.

The tools have been successfully tested on Linux i386 with GCC 4.8 and on Windows 10 with MSVC 2015 (compiler version 14.0). It has to be noted that even when the source code compiled with no errors on the mentioned compilers there were still crashes. Thus migration and debugging continued until the crashes vanished.

Therefore the resulting tools (i.e. the ones listed in the BUSY file) seem to be fit for purpose as specified in the official ECS documentation.

The chibicc C compiler was refactored so it no longer depends on Posix; the ECS IR backend is work in progress.

Precompiled versions

Not available at this time.

How to build

1. Create a new directory; we call it the root directory here
2. Download https://github.com/rochus-keller/EiGen/archive/refs/heads/master.zip and unpack it to the root directory; rename the resulting directory to "EiGen".
3. Download https://github.com/rochus-keller/BUSY/archive/refs/heads/master.zip and unpack it to the root directory; rename the resulting directory to "build".
4. Open a command line in the build directory and type cc *.c -O2 -lm -o lua or cl /O2 /MD /Fe:lua.exe *.c depending on whether you are on a Unix or Windows machine; wait a few seconds until the Lua executable is built.
5. Now type ./lua build.lua ../EiGen (or lua build.lua ../EiGen on Windows); wait until the executable is built; you find it in the output subdirectory.

Alternatively you can open the BUSY file with LeanCreator (see https://github.com/rochus-keller/LeanCreator/) and build it there using multiple cores.

Additional Credits

This project uses a subset of the source code version 0.0.40 (dated 13 March 2024 16:05) provided at https://software.openbrace.org/projects/ecs/files made available under GPL v3 or later by its original author, Florian Negele.