Re: [Xen-devel] [PATCH v2 for-next 2/2] x86/string: Use compiler __builtin_str*() where possible

[Julien Grall <julien.grall@xxxxxxx>]

Hi Andrew,

On 05/12/2017 04:50 PM, Andrew Cooper wrote:
> On 12/05/17 16:42, Julien Grall wrote:
> > Furthemore, someone mentioned a potential legal issue to linked
> > against the built-in. Anyone heard about that?
> The main use of these are optimising things like strlen("literal") at
> compile time.  The use of -fno-bultin disables this optimisation, but as
> we dont link against any runtime libraries, we still provide the
> underling implementation in the case that __builtin_*() fall back to a
> straight function call.
>
> I can't see any possibility for legal issues here.  It is all down to
> exactly which instructions your compiler wants to assemble.
Thank you for the explanation. I misundertood what you suggested. I 
guess this should be fine for ARM.
I will have a look if we can leverage built-in too.

Cheers,

--
Julien Grall

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel