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From: Niklas Haas <ffmpeg@haasn.xyz>
To: ffmpeg-devel@ffmpeg.org
Cc: Niklas Haas <git@haasn.dev>
Subject: Re: [FFmpeg-devel] [PATCH] avfilter/vf_blackdetect: add AVX2 SIMD version
Date: Wed, 16 Jul 2025 10:19:36 +0200
Message-ID: <20250716101936.GF12613@haasn.xyz> (raw)
In-Reply-To: <20250710151042.198670-1-ffmpeg@haasn.xyz>

On Thu, 10 Jul 2025 17:10:42 +0200 Niklas Haas <ffmpeg@haasn.xyz> wrote:
> From: Niklas Haas <git@haasn.dev>
>
> Requested by a user. Even with autovectorization enabled, the compiler
> performs a quite poor job of optimizing this function, due to not being
> able to take advantage of the pmaxub + pcmpeqb trick for counting the number
> of pixels less than or equal-to a threshold.
>
> blackdetect8_c:                                       4627.2 ( 1.00x)
> blackdetect8_avx2:                                     163.9 (28.24x)
> blackdetect16_c:                                      2474.9 ( 1.00x)
> blackdetect16_avx2:                                    155.9 (15.88x)

Merging soon.
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  reply	other threads:[~2025-07-16  8:19 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-10 15:10 Niklas Haas
2025-07-16  8:19 ` Niklas Haas [this message]
2025-07-16 10:48 ` Niklas Haas

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