llvm dev - Sep 2013 - [LLVMdev] %noreg in DBG_VALUE

I have a question regarding the DBG_VALUE instruction.

IIUC the DBG_VALUE appears in two different forms:

1. DBG_VALUE( %Reg, %Reg, metadata)
2. DBG_VALUE(%Reg, offset, metadata)
 
In the first version, the second operand is always a %noreg in the form of:
DBG_VALUE(%Reg, %noreg, metadata).

Is it possible to have a different version of DBG_VALUE that only has 2
operands which will have only %Reg and metadata, because the second operand
appears to be redundant?

Thanks,
-Aditya

On Thu, Sep 12, 2013 at 2:36 PM, Aditya Kumar <hiraditya at
codeaurora.org>wrote:
> I have a question regarding the DBG_VALUE instruction.
>
> IIUC the DBG_VALUE appears in two different forms:
>
> 1. DBG_VALUE( %Reg, %Reg, metadata)
> 2. DBG_VALUE(%Reg, offset, metadata)
>
> In the first version, the second operand is always a %noreg in the form of:
> DBG_VALUE(%Reg, %noreg, metadata).
>
> Is it possible to have a different version of DBG_VALUE that only has 2
> operands which will have only %Reg and metadata, because the second operand
> appears to be redundant?

Possible, but it simplifies the code to only have one representation for
the schema rather than two.
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