[llvm-dev] Making an analysis availble during call lowering

Hal Finkel via llvm-dev llvm-dev at lists.llvm.org
Mon Jul 24 13:52:03 PDT 2017

On 06/13/2017 12:46 PM, Arsenault, Matthew via llvm-dev wrote:
> Hi,
> I want to be able to access a custom analysis pass during call 
> lowering, but there isn't a way to access this now and I'm not sure 
> the least bad way to thread this information into the DAG.
> I want to be able to use knowledge of the callee function to change 
> the lowering of a call. Since AMDGPUDAGToDAGISel is ultimately a 
> normal MachineFunction pass, I'm able to get the interprocedural 
> analysis pass there but don't have a way to pass this into the call 
> lowering where it's actually needed.
> The laziest option would be to stash the pointer to the analysis in 
> the TargetMachine and get it from there, but is probably not the best 
> idea. Another option might be to store a pointer to the 
> SelectionDAGISel pass in SelectionDAG, so then there's a way to access 
> the pass to get analysis directly. Is there another option?

With the legacy pass manager, are you planning to schedule the analysis 
pass manually and then use getAnalysisIfAvailable?

Thanks again,

> -Matt
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Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

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