[LLVMdev] how to avoid llvm to optimize variable

[John Criswell]

On 11/6/13 7:05 AM, sebastien deldon (PGI) wrote:
>
> Hi all,
>
> For debugging purpose, I would like to create temporary local 
> variables that I want to keep 'live' for a routine execution. They 
> will be set to a value at routine entrance and I they will never be used.
>
> Is there a way to avoid llvm to optimize them away when mem2reg is 
> performed ?
>

If you access the alloca'ed variables with volatile loads and stores, 
then I think mem2reg will be unable to promote them to SSA registers.

-- John T.

> Thanks for your answer
>
> Seb
>
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