What is TorchOps.cpp.inc in torch-mlir

 

What is TorchOps.cpp.inc?

• TorchOps.cpp.inc: This file contains implementations of the operations for the torch-mlir dialect. It is typically generated from .td (TableGen) files that define the dialect and its operations.
• The .td (TableGen) files describe MLIR operations in a high-level, declarative form, and the cmake build process automatically generates .cpp.inc files (like TorchOps.cpp.inc) from these .td files.

How it gets generated:

1. TableGen: The TableGen tool processes .td files that define the operations and attributes for the torch dialect.
2. CMake Build: During the CMake build process, the mlir-tblgen tool is invoked to generate various .inc files, including TorchOps.cpp.inc.

Where It Is Generated:

The TorchOps.cpp.inc file is usually generated in the build directory under the subdirectories for the torch-mlir project. For example:

build/tools/torch-mlir/lib/Dialect/Torch/IR/TorchOps.cpp.inc

This file gets included in the compiled source code to provide the implementation of the Torch dialect operations.

How to Ensure It Is Generated:

If the file is missing, it's likely because there was an issue in the build process. Here’s how to ensure it’s generated:

1. Ensure CMake and Ninja Build: Make sure the CMake and Ninja build process is working correctly by following the steps we discussed earlier. You can check that the TorchOps.cpp.inc file is generated by looking in the build directory:

   ls build/tools/torch-mlir/lib/Dialect/Torch/IR/
   

2. Check for TableGen Files: Make sure that the .td files (such as TorchOps.td) are present in the source directory. These are used by mlir-tblgen to generate the .cpp.inc files.

Debugging if Not Generated:

If TorchOps.cpp.inc or similar files are not generated, ensure:

• You are running the full build using ninja or make.
• mlir-tblgen is being invoked during the build process (you should see log messages referencing mlir-tblgen).