Re: [Xen-devel] [PATCH 11/34] xen/arm: Introduce __builtin_stack_pointer

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 03/25/2014 05:18 PM, Ian Campbell wrote:
> On Tue, 2014-03-25 at 16:55 +0000, Julien Grall wrote:
>> Clang doesn't support named register. Introduce __builtin_stack_pointer
>> to be able to use named register with gcc.
> 
> I think gcc considers the __builtin namespace to be its own, not sure
> about clang.

I'm able to compile on GCC without any issue.

> I think get_stack_pointer() would be a fine name for this macro. It
> seems like the clang version should work for both gcc and clang.
> 
> Google seems to suggest that __builtin_stack_pointer might become a real
> compiler builtin at some point.

I took the idea to the llvmlinux project:
http://git.linuxfoundation.org/?p=llvmlinux.git;a=blob;f=arch/arm/patches/current_stack_pointer_arm.patch;

But I can rename into get_stack_pointer for the next version.

Regards,

-- 
Julien Grall

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