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I ran into the same problem in OpenCL with Local/Private address spaces and I believe it was discussed here in the past. So I would suggest looking through the archives as I believe some of your questions are answered there. This post might be a good starting point: http://lists.cs.uiuc.edu/pipermail/llvmdev/2011-October/044101.html Also the SPIR provisional spec as of last November deals with

I feel a bit silly asking this, but here goes. The C spec does not require the null pointer to be implemented as an integer with the 0 bit-pattern. The implementation may arbitrarily choose any other (integer, but not necessarily) representation, as long as it's distinct from any legal pointer. The only requirement is that casting an integer 0 to a pointer type results in a null pointer.

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