[LLVMdev] Question about method CodeExtractor::severSplitPHINodes

[Caldarale, Charles R]

> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
> On Behalf Of Wei Dang
> Subject: [LLVMdev] Question about method CodeExtractor::severSplitPHINodes

> In the implementation of serverSplitPHINodes(), why it only checks the 
> first PHI node for possible multiple inputs from outside the region to 
> extract. There could be more than one PHI nodes in the header block,
> and the code only checks the first one. I don't quite get it. What if
> the first PHI node contains only incoming values from inside the region,
> while subsequent PHI nodes have inputs from outside? Is that possible?

No, it's not possible.  All PHI nodes must include inputs for _all_ predecessors of the block, so only one PHI node needs to checked for the origins.

 - Chuck


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