From: "Rémi Denis-Courmont" <remi@remlab.net>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH 4/4] lavu/fixed_dsp: R-V V vector_fmul_window
Date: Thu, 05 Oct 2023 17:54:48 +0300
Message-ID: <2357615.W6rPUtsr1t@basile.remlab.net> (raw)
In-Reply-To: <20231004195110.38615-4-remi@remlab.net>
Le keskiviikkona 4. lokakuuta 2023, 22.51.10 EEST Rémi Denis-Courmont a écrit
:
> + vwmul.vv v12, v16, v28
> + vwmul.vv v8, v16, v24
> + // vwnmsac.vv does _not_ exist so multiply & subtract separately
> + vwmul.vv v4, v20, v24
> + vwmacc.vv v8, v20, v28
Retaining 3 whole double-width multiply vectors is really hurting here. This
would be a lot smoother with just the top-halves (vsmul.vv), but then we need
to round each multiplication. Of course the final results would differ slightly
then, and I am not sure what that entails for the audio codecs (nor would I
know how to update the x86 code).
N.B.: Don't ask for benchmarks, this can't run on v0.7.1 proto-RVV hardware.
--
雷米‧德尼-库尔蒙
http://www.remlab.net/
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
prev parent reply other threads:[~2023-10-05 14:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-04 19:51 [FFmpeg-devel] [PATCH 1/4] lavu/fixed_dsp: R-V V vector_fmul_add Rémi Denis-Courmont
2023-10-04 19:51 ` [FFmpeg-devel] [PATCH 2/4] lavu/fixed_dsp: R-V V vector_fmul_reverse Rémi Denis-Courmont
2023-10-04 19:51 ` [FFmpeg-devel] [PATCH 3/4] lavu/fixed_dsp: R-V V vector_fmul Rémi Denis-Courmont
2023-10-04 19:51 ` [FFmpeg-devel] [PATCH 4/4] lavu/fixed_dsp: R-V V vector_fmul_window Rémi Denis-Courmont
2023-10-05 14:54 ` Rémi Denis-Courmont [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=2357615.W6rPUtsr1t@basile.remlab.net \
--to=remi@remlab.net \
--cc=ffmpeg-devel@ffmpeg.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Git Inbox Mirror of the ffmpeg-devel mailing list - see https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
This inbox may be cloned and mirrored by anyone:
git clone --mirror https://master.gitmailbox.com/ffmpegdev/0 ffmpegdev/git/0.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 ffmpegdev ffmpegdev/ https://master.gitmailbox.com/ffmpegdev \
ffmpegdev@gitmailbox.com
public-inbox-index ffmpegdev
Example config snippet for mirrors.
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git