How to identify a library function call in IR?

[CodeATA]

Hi all,

Recently I’ve been working on LLVM IR. I need to identify function calls to a dynamic library, like glibc. I found isDeclaration() of Function class might be useful. So could it identify external function calls? Is there a more graceful way of identifying such calls?

Moreover, when used in a link-time optimization pass, will it give out different results from those when used in a normal optimization pass?

Thanks.

[MuPei]

Hi,

I need to identify function calls to a dynamic library, like glibc. I found isDeclaration() of Function class might be useful. So could it identify external function calls? Is there a more graceful way of identifying such calls?

I guess the library_call field in Linalg Dialect would be helpful. And currently I have finished the path with: a pytorch code → torch-mlir → mlir → llvm → objective file. Here’s what we discussed before.

Linagl VS Affine

Not yet. It has been designed for such cases, but nobody actually needed that particular feature so nobody implemented it. It shouldn’t be hard to write as a pattern. Thanks very much for your reply! I’m quite interested in this. Do you mean write a pattern in linalg, then use something like library_call?

Lowering optional attributes in Linalg StructuredOps to Standard dialect

Hello Jack, Thank you for opening this discussion, it is exciting to see the community picking up some of the loose ends we didn’t have the resources to address on the spot. As context, having strong support for interleaving codegen and library calls is on of the key design principles of the StructuredOps abstractions (of which Linalg is an implementation). As you note, there is currently no support for passing attribute values to the library call itself. As the first official user of this fe…

Hope this could be helpful.

Btw, I’m committing some code about it. Wish to be merged soon.

[CodeATA]

Thank you for your notification. However, I was working on the traditional IR instead of MLIR when I posted this topic. I was trying to pick out calls to library functions in a traditional C/C++ program, so Linalg Dialect offers little help for this problem. But thanks for the information anyway. Hope you are doing well in your project.

[MuPei]

Thank you