From: Florian Weimer <fweimer@redhat.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH] x86: Set Prefer_No_VZEROUPPER if AVX512ER is available
Date: Tue, 18 Apr 2017 05:48:00 -0000 [thread overview]
Message-ID: <0ded571f-5b08-3386-e19c-c69840f2c31f@redhat.com> (raw)
In-Reply-To: <CAMe9rOpW2QAZGKiRMR3OPY=PcGg4ZFB256NiKpWCuWNG1D3meg@mail.gmail.com>
On 04/17/2017 10:13 PM, H.J. Lu wrote:
> On Mon, Apr 17, 2017 at 1:06 PM, Florian Weimer <fweimer@redhat.com> wrote:
>> On 04/17/2017 09:54 PM, H.J. Lu wrote:
>>>
>>> Since AVX512ER is unique to Xeon Phi, set Prefer_No_VZEROUPPER if
>>> AVX512ER is available.
>>
>>
>> This approach doesn't seem very future-proof to me.
>>
>
> AVX512ER won't be implemented in any Xeon processors and it will be in
> all Xeon Phi processors. In this way, we don't need to check CPU model
> numbers when setting Prefer_No_VZEROUPPER. It will work with current
> and future Xeon Phi and non-Xeon Phi processors.
Well, okay. I see it's in the Intel-specific block, so the change
should be okay.
Thanks,
Florian
prev parent reply other threads:[~2017-04-18 5:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-17 19:54 H.J. Lu
2017-04-17 20:06 ` Florian Weimer
2017-04-17 20:13 ` H.J. Lu
2017-04-18 5:48 ` Florian Weimer [this message]
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