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From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Tue, 7 Dec 2021 05:34:47 -0800
Message-ID: <CAMe9rOqnJ9xgKbUiP10hPS33hpQF5g-cqHm3a6cgtwyk8RYoFw@mail.gmail.com>
Subject: Re: [PATCH] x86: Don't set Prefer_No_AVX512 for processors with
 AVX512 and AVX-VNNI
To: Arjan van de Ven <arjan@linux.intel.com>,
 Hongyu Wang <hongyu.wang@intel.com>, liuhongt <hongtao.liu@intel.com>
Cc: Noah Goldstein <goldstein.w.n@gmail.com>,
 Thiago Macieira <thiago.macieira@intel.com>, 
 GNU C Library <libc-alpha@sourceware.org>
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On Tue, Dec 7, 2021 at 5:18 AM Arjan van de Ven <arjan@linux.intel.com> wrote:
>
> On 12/7/2021 4:53 AM, H.J. Lu wrote:
> >> Should we also do Rocket Lake?
> >> According to Travis Downs at least downclocking is an issue there ether:
> >> https://travisdowns.github.io/blog/2020/08/19/icl-avx512-freq.html#rocket-lake
> >
> > Thiago, Arjan,
> >
> > Is this true that Rocket Lake can use ZMM load/store?
> >
>
>
> I have no specific data myself about rocket lake... but data is data...
> so I'm all for trying it, but other than looking at cpuid's model number

Hongtao, Hongyu,  can you find a Rocket Lake to test?

> I wouldn't know of an easy way to detect RKL vs ICL or others

In GCC, RKL ISAs are ICL ISAs without SGX.


-- 
H.J.