From: Lynne <dev@lynne.ee>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCHv2 0/10] RISC-V V floating point DSP
Date: Sun, 4 Sep 2022 19:48:26 +0200 (CEST)
Message-ID: <NB8bYGA--3-2@lynne.ee> (raw)
In-Reply-To: <3372981.QJadu78ljV@basile.remlab.net>
Sep 4, 2022, 15:54 by remi@remlab.net:
> The following changes since commit b6e8fc1c201d58672639134a737137e1ba7b55fe:
>
> avcodec/speexdec: improve support for speex in non-ogg (2022-09-04 11:31:57 +0200)
>
> are waiting thorough bashing at your express convenience up to:
>
> riscv: float vector dot product with RVV (2022-09-04 16:45:38 +0300)
>
> Changes since v1:
>
> - Removed stray define.
> - Fixed mismatch between byte and element size in mul-scalar.
> - Added fmul, fac, dmul, dmac, fmul-add, fmul-reverse, fmul-window.
> - Added float butterfly and dot product.
>
> All operations are unrolled to the maximum group size (8), with the
> exception of overlap/add. The later seems to require a minimum of 6
> vectors (maybe 5 by extremely careful ordering), so the group size is
> only 4.
>
> The pointer arithmetic could be slightly optimised with SH2ADD and
> SH3ADD instructions from the Zvba extension. This would require more
> conditional code, or requiring support for Zvba for probably neglible
> performance gains though.
>
Did you test on real hardware or a VM?
If the former, what does checkasm --bench report?
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next prev parent reply other threads:[~2022-09-04 17:48 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-04 13:54 Rémi Denis-Courmont
2022-09-04 13:54 ` [FFmpeg-devel] [PATCH 01/10] riscv: add CPU flags for the RISC-V Vector extension remi
2022-09-04 13:54 ` [FFmpeg-devel] [PATCH 02/10] riscv: initial common header for assembler macros remi
2022-09-04 13:54 ` [FFmpeg-devel] [PATCH 03/10] riscv: float vector-scalar multiplication with RVV remi
2022-09-04 13:54 ` [FFmpeg-devel] [PATCH 04/10] riscv: float vector-vector " remi
2022-09-04 13:54 ` [FFmpeg-devel] [PATCH 05/10] riscv: float vector multiply-accumulate " remi
2022-09-04 13:54 ` [FFmpeg-devel] [PATCH 06/10] riscv: float vector multiplication-addition " remi
2022-09-04 13:55 ` [FFmpeg-devel] [PATCH 07/10] riscv: float vector sum-and-difference " remi
2022-09-04 13:55 ` [FFmpeg-devel] [PATCH 08/10] riscv: float reversed vector multiplication " remi
2022-09-04 13:55 ` [FFmpeg-devel] [PATCH 09/10] riscv: float vector windowed overlap/add " remi
2022-09-04 13:55 ` [FFmpeg-devel] [PATCH 10/10] riscv: float vector dot product " remi
2022-09-04 17:48 ` Lynne [this message]
2022-09-04 19:01 ` [FFmpeg-devel] [PATCHv2 0/10] RISC-V V floating point DSP Rémi Denis-Courmont
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