Developing a pass for the backend

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#1

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

#2

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

#3

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