[llvm-dev] Unsupported ISD node in backend

Tue May 21 12:51:10 PDT 2019

On 05/21/2019 12:46 AM, Romaric Jodin via llvm-dev wrote:
> Hi all,
> 
> I have a backend that does not support address space casting, and I would like it to tell the user that he cannot do a cast of pointer of different address space.
> But I don't know where and how I should do it. At the moment I have a "report_fatal_error" in the "Select" function of ISelDagToDag, but as so I'm not able to give the file and line where the error is. And without it, it's a bit tricky for the user to find his error.
> It is possible to implement this behavior, where and how?
> 

Here is an example of the AMDGPU backend doing something similar to what you want:

https://github.com/llvm/llvm-project/blob/master/llvm/lib/Target/AMDGPU/SIMemoryLegalizer.cpp#L444

-Tom

> Thanks,
> Romaric
> 
> 
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