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From: James Darnley <jdarnley@obe.tv>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH] avcodec/v210enc: add new function for avx2 avx512 avx512icl
Date: Mon, 31 Oct 2022 13:52:15 +0100
Message-ID: <8261adde-97ec-af13-b75a-970c915d9f73@obe.tv> (raw)
In-Reply-To: <CAPYFPM27Vc4pauVp_2Lf0DdE-XzeSzPYD0XR3dnT_J2NeEqggg@mail.gmail.com>

>> +        %else
>> +            pand       m1, m6, m1
>> +            pandn      m0, m6, m0
>> +            por        m0, m0, m1
>> +        %endif
> 
> Isn't that pattern a vpblendb or some such ?

I think Kieran already responded to this on IRC but I will too. 
Unfortunately not.  This blend is at the bit level.  This is v210 so the 
packing has the middle sample overlapping with the bottom sample in the 
second byte.

I also want to amend my performance numbers on Broadwell.  I can confirm 
Kieran's disagreement and can reproduce the 10% speed up on it:
     1676±14.6 vs 1426±20.9

I will re-check Zen and amend the commit message as necessary.
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      reply	other threads:[~2022-10-31 12:54 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-28 18:55 James Darnley
2022-10-28 23:26 ` Kieran Kunhya
2022-10-29  8:19 ` Christophe Gisquet
2022-10-31 12:52   ` James Darnley [this message]

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