[LLVMdev] Handling of DebugLocs during CSE of SelectionDAG nodes.

[Richard Osborne]

On 14/09/11 19:28, Devang Patel wrote:
> On Sep 14, 2011, at 10:34 AM, Jakob Stoklund Olesen wrote:
>
>> At -O0, SelectionDAG nodes are scheduled in source order when possible.
>>
>> When merging identical nodes, you should make sure that the resulting node has the earlier source order, and the debug location should match.
>>
>> That way, CSE simply looks like the last definition of a value has been removed.  Debug location and source order of the first definition should be preserved.
> hmm… I agree with Jakob. See SelectionDAG::GetOrdering()
>
> -
> Devang
Thanks for your replies. That does seem like a better approach if that 
kind of information is easily available.

-- 
Richard Osborne | XMOS
http://www.xmos.com