Re: [Xen-devel] [PATCH 02/12] xen/arm: fix get_cpu_info() when built with clang

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 4/17/19 9:45 PM, Stefano Stabellini wrote:
> On Wed, 27 Mar 2019, Julien Grall wrote:
> > Clang understands the GCCism in use here, but still complains that sp is
> > unitialised. In such cases, resort to the older versions of this code,
> > which directly read sp into the temporary variable.
> >
> > Note that we still keep the GCCism in the default case, as it causes GCC
> > to create rather better assembly.
> >
> > This is based on the x86 counterpart.
> I understand this is based on an existing approach but what about other
> compilers? I have a suggestion below.
What if the compiler actually support named registers? Why would we make 
the code less efficient?
Cheers,

--
Julien Grall

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