llvm dev - Feb 2018 - Developing a pass for the backend

Hi,

Is there a way to map a MachineInstr to the respective LLVM IR using a
MachineFunctionPass (or something else) in my backend?

I need to read some metadata associated with LLVM IR instructions and
I was thinking of using some debug information (DebugLoc?) to do so.
However, By inspecting the LLVM source code I have not been able to
find any mapping between a MachineInstr and a LLVM IR Instruction.

Thanks,
Tiago

​See if this thread
http://lists.llvm.org/pipermail/llvm-dev/2017-November/119274.html help.​

2018-02-05 4:12 GMT+08:00 Pedro Lopes via llvm-dev <llvm-dev at
lists.llvm.org>
:
> Hi,
>
> Is there a way to map a MachineInstr to the respective LLVM IR using a
> MachineFunctionPass (or something else) in my backend?
>
> I need to read some metadata associated with LLVM IR instructions and
> I was thinking of using some debug information (DebugLoc?) to do so.
> However, By inspecting the LLVM source code I have not been able to
> find any mapping between a MachineInstr and a LLVM IR Instruction.
>
> Thanks,
> Tiago
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>


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

Unfortunately, I think it does not help.

I need a complete mapping from IR (class Instruction) to MachineInstr
(?). I need to know, for a specific IR instruction, which assembly
instructions are generated.
I think that post doesn't go that far as I believe MachineInstr have
no connection to the SelectionDAG.

Tiago

2018-02-05 13:45 GMT+01:00 陳韋任 <chenwj.cs97g at
g2.nctu.edu.tw>:
> See if this thread
> http://lists.llvm.org/pipermail/llvm-dev/2017-November/119274.html help.
>
> 2018-02-05 4:12 GMT+08:00 Pedro Lopes via llvm-dev
> <llvm-dev at lists.llvm.org>:
>>
>> Hi,
>>
>> Is there a way to map a MachineInstr to the respective LLVM IR using a
>> MachineFunctionPass (or something else) in my backend?
>>
>> I need to read some metadata associated with LLVM IR instructions and
>> I was thinking of using some debug information (DebugLoc?) to do so.
>> However, By inspecting the LLVM source code I have not been able to
>> find any mapping between a MachineInstr and a LLVM IR Instruction.
>>
>> Thanks,
>> Tiago
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
>
>
> --
> Wei-Ren Chen (陳韋任)
> Homepage: https://people.cs.nctu.edu.tw/~chenwj