[LLVMdev] How to determine if a variable has been discarded

[kecheng at cecs.pdx.edu]

Hi all,

When I check the ll code, I found sometimes an operation has one or  
more "undef" operands. Does that means this operations has been  
discarded? What I want to check is how to determine which variables  
have been discarded. If I decide to discard everything that is  
transitively related to an undef then is that correct? If I implement  
that algorithm, is there a discard I'll be missing? Thanks.

Best,

Kecheng