[llvm-dev] Unknown Target Node

[Craig Topper via llvm-dev]

I think "Unknown Target Node" is a target specific ISD opcode. A machine
node would be "Unknown Machine Node". Assuming I'm reading
SDNode::getOperationName correctly.

Josh, you should make sure all you target specific ISD opcodes are handled
in your *TargetLowering::getTargetNodeName method.

~Craig


On Sat, Mar 2, 2019 at 9:42 PM preejackie via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> 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
>
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