[llvm-dev] question: access IR class Instruction from DAG SDValue

[Jonathan via llvm-dev]

Seems llvm cannot pass metadata to MachineInstr, or setting operand description in class Instruction and pass to class MachineInstr.
Is it a good idea to extend llvm kernel structure to having this feature?

Jonathan


> On Nov 27, 2017, at 9:01 PM, Jatin Bhateja <jatin.bhateja at gmail.com> wrote:
> 
> SelectionDAGBuilder contained within SelectionDAGISel has a map (NodeMap) b/w Value (Instruction) and corrosponding dag value (SDValue).
> 
> Isn't that usable for your purpose.
> 
> Thanks,
> Jatin
> 
> On 27 Nov 2017 18:21, "Jonathan via llvm-dev" <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> I am working on llvm gpu backend. The instruction metadata can only get in IR (class instruction). In DAG stage, the instructions are reordered, so I cannot map the metadata to correct instruction if I cannot access instruction from DAG or MachineInstr structure.
> 
> 
>> On Nov 26, 2017, at 11:02 PM, Ryan Taylor <ryta1203 at gmail.com <mailto:ryta1203 at gmail.com>> wrote:
>> 
>> It might be a more useful to know what it is you need from the IR in the DAG or what it is you r trying to do?
>> 
>> 
>> 
>> On Nov 25, 2017 7:59 PM, "Jonathan via llvm-dev" <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> The llvm backend uses class Instruction in IR handle stage, create SDVaule and DAG in DAG translation stage and class MachineInstr in Machine instruction translation stage.
>> Can I access class Instruction from DAG structure or stage, or access DAG and Instruction from MachineInstr structure or stage?
>> 
>> Jonathan
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