llvm dev - Oct 2009 - [LLVMdev] named address spaces

Hello,

If my understand is correct, LLVM supports the address_space qualifier;
however, how I can add custom address spaces. Where I can declare them? For
clang (x86), I saw that address spaces #256 and #257 works well (I see the
generated code with the 'gs' and 'fs'), but when I select
different ones, I
don't see any different.

Thanks in advance,

-- 
Juan Carlos
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On Oct 16, 2009, at 1:22 PM, Juan Carlos Martinez Santos wrote:
> Hello,
>
> If my understand is correct, LLVM supports the address_space  
> qualifier; however, how I can add custom address spaces. Where I can  
> declare them? For clang (x86), I saw that address spaces #256 and  
> #257 works well (I see the generated code with the 'gs' and
'fs'),
> but when I select different ones, I don't see any different.
>
Address spaces are target specific.  The 256/257 address spaces on x86  
are implemented in the X86 backend, for example.

-Chris

Hello,

If I want implement other address spaces (for x86), can I modify my back-end
(clang) to support other address spaces (at least two data segments, two
heaps, and two stacks?

How will be the mechanism? For example, for256/257, I see two reference
points (FS and GP). Would I need to specify a different reference to
each memory region? Where is the best site to add the modifications?

Thanks in advance,

Juan Carlos

On Fri, Oct 16, 2009 at 4:34 PM, Chris Lattner <clattner at apple.com>
wrote:
>
> On Oct 16, 2009, at 1:22 PM, Juan Carlos Martinez Santos wrote:
>
> Hello,
>>
>> If my understand is correct, LLVM supports the address_space qualifier;
>> however, how I can add custom address spaces. Where I can declare them?
For
>> clang (x86), I saw that address spaces #256 and #257 works well (I see
the
>> generated code with the 'gs' and 'fs'), but when I
select different ones, I
>> don't see any different.
>>
>>
> Address spaces are target specific.  The 256/257 address spaces on x86 are
> implemented in the X86 backend, for example.
>
> -Chris
>
>

-- 
Juan Carlos
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