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MLIRToyCompiler

MLIR Toy Compiler lowering a sequence of matrix operations, with Tiling and Bufferization.

Description

The compiler supports basic operations for matrices including ConstantOp, AddOp, MulOp using operation definition specification (ODS) via tablegen. Support for tiling and bufferization is also provided via custom passes (more details below).

The operations are lowered to LLVM by validating the dialect and operations appropriately which can be piped to the mlir-cpu-runner.

Build Tools and Versioning

  • CMake 3.29.6
  • Ninja 1.12.1
  • LLVM / MLIR 18.1.8 (HomeBrew Standalone)

Usage

As per the current CMake config (can be updated as needed), to build:

(Project Root)

cmake -G "Ninja" -S ./ -B build/
ninja -C build/

Once build is successful, the mini-opt tool will be generated. The tests can be executed manually as of now, support for LLVM Lit infrastructure and FileCheck will be added soon.

Passes supported:

  • -tile-ops
  • -one-shot-bufferize
  • -lower-to-affine
  • -lower-to-llvm

Examples:

Tiling:

build/bin/mini-opt -tile-ops test/<test_folder>/<test_file>

Tiling with Bufferization:

build/bin/mini-opt -tile-ops -one-shot-bufferize test/<test_folder>/<test_file>

Affine (partial) lowering:

build/bin/mini-opt -lower-to-affine test/<test_folder>/<test_file>

Affine (partial) + LLVM (full) lowering:

build/bin/mini-opt -lower-to-affine -lower-to-llvm test/<test_folder>/<test_file>

Note:

The following pass combination requires ExtractSliceOpLowering and InsertSliceOpLowering which will be added in the next commit:

build/bin/mini-opt -tile-ops -lower-to-affine -lower-to-llvm test/<test_folder>/<test_file>

The full lowering can then be piped to the mlir-translate tool to get final LLVM IR:

build/bin/mini-opt -lower-to-affine -lower-to-llvm test/<test_folder>/<test_file> | 
/opt/homebrew/Cellar/llvm/18.1.8/bin/mlir-translate -mlir-to-llvmir

This can further be passed to llc to get assembly code:

build/bin/mini-opt -lower-to-affine -lower-to-llvm test/<test_folder>/<test_file> | 
/opt/homebrew/Cellar/llvm/18.1.8/bin/mlir-translate -mlir-to-llvmir |
/opt/homebrew/Cellar/llvm/18.1.8/bin/llc