[LLVMdev] Is address space 1 reserved?

[Owen Anderson]

I'm not aware of any such restriction, and I know of several LLVM based systems that use address space 1 for something other than that.

-Owen

> On Jan 7, 2015, at 1:18 PM, Philip Reames <listmail at philipreames.com> wrote:
> 
> On the review for http://reviews.llvm.org/D6808, 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?
> 
> 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
> 
> Philip
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