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The MPACT Project

Introduction

The MPACT project's main objective is to dramatically reduce the effort required to create highly optimizing HPC and ML compilers for a large class of architectures using LLVM and MLIR. We will do this by providing a declarative language-based mechanism for collecting and expressing critical aspects of a target architecture in a way that can be reasoned about and leveraged by all passes in both MLIR and LLVM.

Building the MPACT compiler

To build and run the MPACT compiler from source (for developers), please follow the steps below.

Check out code and sync submodules

Use the following commands to clone the MPACT compiler repository.

git clone https://github.com/MPACT-ORG/mpact-compiler.git
cd mpact-compiler
git submodule update --init --progress

All following commands assume you remain in the mpact-compiler directory.

Setup Python virtual environment

The following commands initialize a virtual environment.

python3.11 -m venv mpact_venv  # one time set up
source mpact_venv/bin/activate # for each session

Also make sure to set the Python paths as follows.

export PYTHONPATH=`pwd`/build/tools/torch-mlir/python_packages/torch_mlir:`pwd`/python

Install build requirements

Note that currently we rely on torch-mlir requirements defined in the submodule to ensure all the build requirements are consistent.

python -m pip install --upgrade pip
python -m pip install -r externals/torch-mlir/requirements.txt
python -m pip install -r externals/torch-mlir/torchvision-requirements.txt

Building the MPACT compiler in-tree

The following command generates configuration files to build the MPACT compiler project completely in-tree, which means that both LLVM as well as torch-mlir are built from source.

cmake -GNinja -Bbuild \
  -DCMAKE_BUILD_TYPE=Release \
  -DPython3_FIND_VIRTUALENV=ONLY \
  -DLLVM_ENABLE_PROJECTS=mlir \
  -DLLVM_EXTERNAL_PROJECTS="torch-mlir;mpact" \
  -DLLVM_EXTERNAL_TORCH_MLIR_SOURCE_DIR="${PWD}/externals/torch-mlir" \
  -DLLVM_EXTERNAL_MPACT_SOURCE_DIR="${PWD}" \
  -DLLVM_TARGETS_TO_BUILD=host \
  -DMLIR_ENABLE_BINDINGS_PYTHON=ON \
  externals/torch-mlir/externals/llvm-project/llvm

Run the following to ensure the MPACT compiler builds and runs correctly.

cmake --build build --target check-mpact