xdsl 0.9.1

xDSL

xDSL: A Python-native SSA Compiler Framework

xDSL is a Python-native compiler framework built around SSA-based intermediate representations (IRs). Users of xDSL build a compiler by assembling predefined domain-specific IRs and, optionally, defining their own custom IRs. xDSL uses multi-level IRs, meaning that during the compilation process, a program will be lowered through several of these IRs. This allows the implementation of abstraction-specific optimization passes, similar to the structure of common DSL compilers (such as Devito, Psyclone, and Firedrake). To simplify the writing of these passes, xDSL uses a uniform data structure based on SSA, basic blocks, and regions, which additionally enables the writing of generic passes.

The design of xDSL is influenced by MLIR, a compiler framework developed in C++, that is part of the LLVM project. An inherent advantage of a close design is the easy interaction between the two frameworks, making it possible to translate abstractions and programs back and forth. This results in one big SSA-based abstraction ecosystem that can be worked with through Python, making analysis through simple scripting languages possible. Additionally, xDSL can leverage MLIR's code generation and low-level optimization capabilities.

• Installation
• Using xDSL
• xDSL Developer Setup
  • Developer Installation
  • Testing
  • Formatting

Installation

To use xDSL as part of a larger project for developing your own compiler, just install xDSL via pip:

pip install xdsl

Using xDSL

To use xDSL we recommend following the xDSL Developer Setup to clone the repository including the notebooks. The following tutorials will present xDSL basic concepts, how to use its irdl dialect to define new dialects in a user-friendly way, and how to work with both xDSL and MLIR.

• A simple introduction
• A DSL for defining new IRs
• Connecting xDSL with MLIR

xDSL Developer Setup

To contribute to the development of xDSL follow the subsequent steps.

Developer Installation

git clone https://github.com/xdslproject/xdsl.git
pip install --editable .
# Optional installation of extra requirements
pip install --requirement requirements-optional.txt

Testing

The xDSL project uses pytest unit tests and LLVM-style filecheck tests. They can be executed from the root directory:

# Executes pytests which are located in tests/
pytest

# Executes filecheck tests
lit tests/filecheck

Formatting

All python code used in xDSL uses yapf to format the code in a uniform manner.

To automate the formatting within vim, one can use https://github.com/vim-autoformat/vim-autoformat and trigger a :Autoformat on save.