From: James Almer <jamrial@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH 2/3] swscale/x86/yuv2yuvX: Add yuv2yuvX avx512
Date: Fri, 14 Jul 2023 11:59:11 -0300
Message-ID: <c3b73709-a785-c88b-f63c-53a6724e78b7@gmail.com> (raw)
In-Reply-To: <CAK+ULv4X+vtr_MEzHuVKiQa=8a4J+xYskRjNWkdqv2fANZBp9g@mail.gmail.com>
On 7/14/2023 11:57 AM, Kieran Kunhya wrote:
> On Fri, 14 Jul 2023 at 14:03, James Almer <jamrial@gmail.com> wrote:
>
>> On 7/14/2023 9:59 AM, Kieran Kunhya wrote:
>>>> +#if ARCH_X86_64 && HAVE_AVX512_EXTERNAL
>>>> + if (EXTERNAL_AVX512(cpu_flags))
>>>> + c->yuv2planeX = yuv2yuvX_avx512;
>>>> #endif
>>>>
>>>
>>> You want EXTERNAL_AVX512ICL here.
>>
>> vpermt2q with zmm registers is avx512f and not any of the extensions, so
>> that check is fine.
>>
>
> We still support Skylake and we don't want downclocking on that platform.
> At least that was my understanding of the intention of AVX512 vs AVX512ICL.
> It appears I'm the only one following this convention though.
Ah, no opinion in that regard. I was following the use of the checks in
the strict technical sense of instruction availability.
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next prev parent reply other threads:[~2023-07-14 14:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-14 10:08 Alan Kelly
2023-07-14 12:59 ` Kieran Kunhya
2023-07-14 13:03 ` James Almer
2023-07-14 14:57 ` Kieran Kunhya
2023-07-14 14:59 ` James Almer [this message]
2023-07-17 9:23 ` Alan Kelly
2023-07-17 9:23 ` Alan Kelly
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