[llvm-dev] What is relationship between Operator and Instruction?

[jeniffer lesley via llvm-dev]

I second this question. I never undersrood this in LLVM IR. LangRef fails
to explain this.

On Thu, Jun 10, 2021, 4:46 PM 周书林 via llvm-dev <llvm-dev at lists.llvm.org>
wrote:

> Hi,
>
> Thank you for your suggestions.
> I have learnt the basic IR structures in simple programs, but not all the
> objects could be generated. As I mentioned, about the Operators and
> ConstantExprs. I only got GEPOperator objects from .bc of MySQL. So is
> there any reference to learn about the relationship between those classes
> in IR?
>
> Sincerely,
> Shulin
>
> rahul utkoor <rahulutkoor4887 at gmail.com> 于2021年6月10日周四 下午5:25写道：
>
>> Hello,
>> Since you are starting to learn IR, I recommend you to start with one
>> simple program, compile the program, genreate CFG and understand the
>> hierarchy of types/operands/instructions.
>> It helped me to understand the compilation pipeline in a quick way.
>>
>>
>> Thanks,
>> Rahul Utkoor
>>
>>
>> On Thu, 10 Jun, 2021, 2:08 pm 周书林 via llvm-dev, <llvm-dev at lists.llvm.org>
>> wrote:
>>
>>> Hello everyone,
>>>
>>> I am learning the IR in LLVM and trying to do some analysis. Now I am
>>> doing a dataflow analysis via the def-use chain provided by Users.
>>>
>>> In my opinion, the Users of a Value should be an instruction. However,
>>> when I iterate the User of a Value, sometimes I get an Operator, like
>>> GEPOperator, or an ConstantExpr.
>>> I am quite confused about these situations. My question is, what is
>>> Operator in IR? and what is the difference between Operator and
>>> Instruction? Why can I get a GEPOperator as an Operand in a instruction
>>> rather than two instruction( a gep instruction and the next User
>>> instruction) ?
>>>
>>> Best regards,
>>> Shulin
>>> _______________________________________________
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>>> llvm-dev at lists.llvm.org
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>>>
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