MLIR

The MLIR project is a sub-project of the LLVM project. It's designed to simplify building domain-specific compilers such as ours: Concrete Compiler.

Concrete Compiler accepts MLIR as input and emits compiled assembly code for the target architecture.

Concrete NumPy does the MLIR generation from the computation graph. Code related to this conversion is in concrete/numpy/mlir folder.

The conversion can be performed using convert method of GraphConverter class.

Within convert method of GraphConverter:

MLIR compatibility of the graph is checked
Bit-width constraints are checked
Negative lookup tables are offsetted
Computation graph is traversed and each node is converted to their corresponding MLIR representation using NodeConverter class
String representation of resulting MLIR is returned