[llvm-dev] Unknown Target Node

[Nemanja Ivanovic via llvm-dev]

I would recommend adding -debug-only=isel to the command line. It will show
you the selection DAG before and during ISEL. You can then decipher what
that target-dependent node is and what patterns ISEL has tried before
giving up.

On Sun., Mar. 3, 2019, 3:17 a.m. Craig Topper via llvm-dev, <
llvm-dev at lists.llvm.org> wrote:

> 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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