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From: Kieran Kunhya <kierank@obe.tv>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH] RFC: v210enc optimisations and initial AVX-512
Date: Fri, 21 Oct 2022 04:41:17 +0100
Message-ID: <CAK+ULv5HU0ATUY61AyeZgCNzum4AOiRkF4YZFaDvLUu-LgF5_A@mail.gmail.com> (raw)

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Hi,

Please see attached an attempt to optimise the 8-bit input to v210enc to
reduce the number of shuffles.
This comes at the cost of having to extract the middle element and perform
a DWORD shift on it and then reinserting it.
I have added a few comments but any other ideas are welcome.

Crude benchmarks on Intel(R) Xeon(R) D-2123IT:

Before:

v210_planar_pack_8_ssse3: 316.5
v210_planar_pack_8_avx: 319.0
v210_planar_pack_8_avx2: 223.0

After:

v210_planar_pack_8_ssse3: 321.0
v210_planar_pack_8_avx: 326.0
v210_planar_pack_8_avx2: 217.0
v210_planar_pack_8_avx512: 211.0

Regards,
Kieran Kunhya

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             reply	other threads:[~2022-10-21  3:41 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-21  3:41 Kieran Kunhya [this message]
2022-10-21 13:57 ` Henrik Gramner
2022-10-26 13:51   ` James Darnley

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