[llvm-dev] Unknown Target Node

[preejackie via llvm-dev]

I'm still relatively new to llvm, good to know these errors are from 
CodeGen.

On 03/03/19 10:49 AM, Tim Northover wrote:
> On Sat, 2 Mar 2019 at 21:00, preejackie via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>> Could you please explain how you are using this? like commands
>>
>> When I run this IR in opt, it doesn't throw any errors.
> The error he's reporting is from CodeGen, so opt would never be able
> to reproduce it (you'd have to use llc). I haven't tried, but the
> input is so basic I assume it's also from a private backend.
>
> Unfortunately I can only speculate about the cause. LLVM doesn't
> usually even try to select machine nodes, so the best idea I've come
> up with is that some custom selection code is both modifying the DAG
> and then reporting failure to select. The key questions Josh needs to
> look into are:
>
>    + Is this node there in -view-isel-dags (i.e. before selection)?
>    + If not, what creates it (this'll probably involve looking at
> build/lib/Target/XYZ/XYZGenInstrInfo.inc to work out what 284 is.
>
> Calls are pretty special at the best of times, but I can't think of a
> way they could cause this.
>
> Tim.

-- 
Have a great day!
PreeJackie