[LLVMdev] Address space extension

[Michele Scandale]

On 08/08/2013 02:52 PM, Micah Villmow wrote:
> This is something I proposed last year, so you might want to read up on that discussion first.
>
> You can find it here:
> http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-September/053277.html

Uhm... I read the discussion, probably I've not understood the problem 
well: the conclusion (it has been committed?) is that to handle address 
space conversion that imply a change in the size of pointers must be 
expressed as a pair ptrtoint/inttoptr. What if the address space 
conversione logically change also the value of the pointer?

Indeed, trying to port that solution in the context of in-progress 
proposal: how to handle the fact that the addrspace information is 
logical? Is the frontend that need to produce the correct address space 
conversion? Why having an opaque instruction/generic-intrinsic that 
represent the conversion (what the conversion imply is target specific, 
so that each target should  lower this intrinsic using the knowledge of 
the source and destination address space) is bad?

Thanks again.

-Michele