How does Riallto compile C/C++ into xclbin?

[marty1885]

HI,

I'm looking into using the IPU for my own project. I can't use Riallto directly due to need of calling from C++. I've looked into how the RyzenAI stack works and thinks Riallto most likely goes through MLIR-AIE. However, I don't get how Riallto is able to accept kernels as C++ source code. AFAIK MLIR-AIE only accepts MLIR as input.

How does Riallto compile C/C++ into MLIR? Is there an open tool that can do it?

[STFleming]

Hi @marty1885,

In Riallto we use small subset of the Vitis tools for compiling the C++ kernel code. This kernel code gets compiled into an object file that we can then call on an AIE-Tile from within MLIR-AIE. An example of this can be seen in the repo here.

All the best,
Shane

[marty1885]

Cool thanks! A follow up question. How does Riallto know how much arguments a kernel as/how to assign them? Also is there guides on how to write the MLIR side code by hand (beyond the tutorials and speech slides)?

[STFleming]

No problem at all. The Cpp kernel source is parsed to figure out the types/names here. There are some tutorials on the MLIR-AIE repo that might be helpful for writing the MLIR-AIE code directly.