V6 [PATCH] x86: Add <sys/platform/x86.h>

[H.J. Lu]

On 10/25/18, Florian Weimer <fweimer@redhat.com> wrote:
> * H. J. Lu:
>
>
>> Here is the patch with CPU_FEATURE_USABLE only.  OK for master
>> branch?
>
> Thanks.  Recently, the matter of special-casing code inside target
> clones came up on the glibc list:

I am going to check it in.

>   <https://gcc.gnu.org/ml/gcc-help/2018-10/msg00118.html>
>
> Do you think it might be possible to eventually turn some results for
> CPU_FEATURE_USABLE in target clones into compile-time constants because
> the compiler knows the results of the feature selection in the
> automatically generated IFUNC resolver?

By definition, CPU_FEATURE_USABLE is evaluated at run-time.
Can GCC be extended to allow intrinsics in target_clone.


-- 
H.J.