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

[陳韋任 via llvm-dev]

I'd recommend you writing RFC to the list to explain the motivation and how
you want to do, so that others in interested might have a look.

2017-11-29 8:21 GMT-05:00 Jonathan via llvm-dev <llvm-dev at lists.llvm.org>:

> 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>
> 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> 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>
>> 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
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>
>>
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>>
>
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>


-- 
Wei-Ren Chen (陳韋任)
Homepage: https://people.cs.nctu.edu.tw/~chenwj
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