From: "Rémi Denis-Courmont" <remi@remlab.net>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH] af_afir: RISC-V V fcmul_add
Date: Wed, 27 Sep 2023 19:41:32 +0300
Message-ID: <2238622.iZASKD2KPV@basile.remlab.net> (raw)
In-Reply-To: <CAEa-L+u=vAHtbUBDMZE14MyUMOKkUpU5NyxkSNxBKNVwgzXswg@mail.gmail.com>
Le tiistaina 26. syyskuuta 2023, 12.24.58 EEST flow gg a écrit :
> benchmark:
> fcmul_add_c: 19.7
> fcmul_add_rvv_f32: 6.7
With optimisations enabled and the benchmarking fix, I get this (on the same
hardware, I believe):
fcmul_add_c: 3.5
fcmul_add_rvv_f32: 6.7
For sure unfortunate design limitations of T-Head C910 are to blame to no
small extent. It is not the first occurrence of an RVV optimisation that turns
out worse than scalar due to those, and I still have honest hopes that newer
(and conformant) IP would give saner results, but... I also believe that the
code could be improved regardless.
--
Rémi Denis-Courmont
http://www.remlab.net/
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next prev parent reply other threads:[~2023-09-27 16:41 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 9:24 flow gg
2023-09-26 18:34 ` Rémi Denis-Courmont
2023-09-26 18:40 ` Paul B Mahol
2023-09-26 18:44 ` Rémi Denis-Courmont
2023-09-27 1:47 ` flow gg
2023-09-27 16:01 ` Rémi Denis-Courmont
2023-09-27 16:27 ` Rémi Denis-Courmont
2023-09-26 18:50 ` Rémi Denis-Courmont
2023-09-27 16:41 ` Rémi Denis-Courmont [this message]
2023-09-28 5:45 ` flow gg
2023-09-28 13:33 ` Rémi Denis-Courmont
2023-11-13 9:43 ` flow gg
2023-11-13 15:35 ` Rémi Denis-Courmont
2023-11-13 16:01 ` Paul B Mahol
2023-11-15 8:57 ` flow gg
2023-11-15 8:59 ` flow gg
2023-11-15 15:05 ` Rémi Denis-Courmont
2023-11-15 23:04 ` flow gg
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