From: "Rémi Denis-Courmont" <remi@remlab.net>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH v7] libavcodec/riscv: add RVV optimized idct_32x32_8 for HEVC
Date: Sat, 05 Jul 2025 14:30:00 +0300
Message-ID: <2227321.irdbgypaU6@basile.remlab.net> (raw)
In-Reply-To: <20250617025323.348243-1-daichengrong@iscas.ac.cn>
Hi,
I'm aware that this patch is being held an inappropriate amount of time
waiting for review, but as I said before, I have NO experience dealing with
such a large transform, and I am kinda busy.
Note that I don't really see the point in specialising the code by VLEN.
Properly designed hardware should handle VLEN-agnostic code just fine. The
spirit of the RVV spec is to scale execution time by VL, not by VLEN. This is
also how SiFive chips work, and I don't think we should be filling FFmpeg code
with specialised code for subpar hardware designs. (RISC-V being open, there
will always be crappy, insane and/or weird implementations; we can't handle
them all.)
--
ヅニ-クーモン・レミ
Villeneuve de Tapiola, ex-République finlandaise d´Uusimaa
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prev parent reply other threads:[~2025-07-05 11:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-17 2:53 daichengrong
2025-07-05 11:30 ` Rémi Denis-Courmont [this message]
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