Re: [FFmpeg-devel] [PATCH 0/3] RISC-V V swscale pixel format conversions

From: Lynne <dev@lynne.ee>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 0/3] RISC-V V swscale pixel format conversions
Date: Thu, 29 Sep 2022 06:04:28 +0200 (CEST)
Message-ID: <ND6Ph6r--3-2@lynne.ee> (raw)
In-Reply-To: <12088142.O9o76ZdvQC@basile.remlab.net>

Sep 28, 2022, 17:29 by remi@remlab.net:

> Hello,
>
> This adds the pixel format conversions that appear to covered by checkasm
> (plus YUYV to I422 for which a patch was sent already).
>
> RVV has no register-register interleaving/deinterleaving instructions, so this
> uses strided loads or stores instead. Another option would be full register move then segmented store, but that is presumably slower.
>
> The following changes since commit d31013166ac3727ae7c7ebbb756e1e5800bc2b40:
>
>  lavc/pixblockdsp: RISC-V diff_pixels & diff_pixels_unaligned (2022-09-28 11:46:11 +0200)
>
> are available in the Git repository at:
>
>  git.remlab.net:git/ffmpeg.git rvv-swscale
>
> for you to fetch changes up to 18edd2c3108b126fc478635ac1048db60b9d7fc4:
>
>  sws/rgb2rgb: RISC-V 64-bit V packed YUYV/UYVY to planar 4:2:2 (2022-09-28 18:23:53 +0300)
>
> ----------------------------------------------------------------
> Rémi Denis-Courmont (3):
>  sws/rgb2rgb: RISC-V V shuffle_bytes_xxxx functions
>  sws/rgb2rgb: RISC-V V interleaveBytes
>  sws/rgb2rgb: RISC-V 64-bit V packed YUYV/UYVY to planar 4:2:2
>
>  libswscale/rgb2rgb.c           |   2 +
>  libswscale/rgb2rgb.h           |   1 +
>  libswscale/riscv/Makefile      |   2 +
>  libswscale/riscv/rgb2rgb.c     |  61 ++++++++++++++++
>  libswscale/riscv/rgb2rgb_rvv.S | 157 +++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 223 insertions(+)
>  create mode 100644 libswscale/riscv/Makefile
>  create mode 100644 libswscale/riscv/rgb2rgb.c
>  create mode 100644 libswscale/riscv/rgb2rgb_rvv.S
>

Patchset looks good. Will apply in a couple of hours.

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