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...Would that address your use case? Or can you have null dereferenceable pointers in that address space, just not ones from alloca? I would like to clarify what “null” means exactly. One related thing I would like in the future is for the DataLayout to specify what numeric value is the invalid, non-dereferencalbe pointer. i.e. the invalid pointer does is a some non-0 bit pattern like -1. -Matt -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20171215/d29fb446/attachment.html>

Hal, Thanks for your suggestion. I think that makes sense. Currently, non-zero alloca address space is already represented by data layout, e.g., the last component of the data layout of amdgcn---amdgiz target is -A5, which means alloca is in address space 5. How about adding a letter z to -A5 to indicate alloca may have zero value? i.e. -A5 means alloca is in address space 5 and always has