[LLVMdev] Is address space 1 reserved?

[Pete Cooper]

> On Jan 7, 2015, at 11:18 AM, Philip Reames <listmail at philipreames.com> wrote:
> 
> On the review for http://reviews.llvm.org/D6808 <http://reviews.llvm.org/D6808>, majnemer <http://reviews.llvm.org/p/majnemer/> commented that:
> "Address space 1 has a special meaning in LLVM, it's identical to address space 0 except for the fact that "null" may be dereferenced. You might want to consider a different address space."
> 
> This is the first I've heard of this and I can't find any documentation about it being reserved, either in general, or specifically for x86.  Can anyone clarify?
First i’ve heard of it...
> 
> The only address spaces with special meanings I know of are:
> - 0 (the normal address space, null is not dereferencable)
> - 256 - TLS, GS relative addressing
> - 257 - FS relative addressing
I didn’t even know 256/257 had special meanings.  I thought they were only used by x86.  It would be good to clarify them too just incase other targets ever wanted to use them.

Thanks,
Pete
> 
> Philip
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