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Re: V6 [PATCH] x86: Add <sys/platform/x86.h>
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Florian Weimer <fweimer at redhat dot com>
- Cc: libc-alpha at sourceware dot org
- Date: Thu, 25 Oct 2018 18:56:56 -0700
- Subject: Re: V6 [PATCH] x86: Add <sys/platform/x86.h>
- References: <CAMe9rOqcfBAsSQQme3VJyMKsbAvKO_YdaG=1ZJqrm+T8aPztag@mail.gmail.com> <87efcekula.fsf@oldenburg.str.redhat.com>
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.