[PATCH][DAG] Fix non-deterministic code generation

[Juergen Ributzka]

Hi Hal,

the availability queue in the list scheduler returns the nodes in IR order. If there is more than one node ready to schedule, then the difference in the IR order will produce different schedules.

-Juergen

On Nov 16, 2013, at 10:40 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> Juergen,
> 
> Do you happen to know what in CodeGen is sensitive to the absolute value of the node order?
> 
> -Hal
> 
> ----- Original Message -----
>> From: "Juergen Ributzka" <juergen at apple.com>
>> To: "LLVM Commits" <llvm-commits at cs.uiuc.edu>
>> Sent: Saturday, November 16, 2013 11:04:29 PM
>> Subject: [PATCH][DAG] Fix non-deterministic code generation
>> 
>> 
>> 
>> Hi @ll,
>> 
>> this patch resets SDNodeOrder in the SelectionDAGBuilder before
>> processing the IR of a new function. This is required to obtain
>> deterministic code generation for a function regardless of its
>> location in the source file.
>> 
>> Cheers,
>> Juergen
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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>> 
> 
> -- 
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory