I tested this in '[FFmpeg-devel] [PATCH] lavc/vc1dsp: R-V V inv_trans'. The
logic here is the same, using vext can reduce vset, making it a bit faster
Rémi Denis-Courmont 于2024年2月13日周二 03:46写道：
> Le keskiviikkona 31. tammikuuta 2024, 19.58.55 EET flow gg a écrit :
> > Fixed the rv32 break in
Le keskiviikkona 31. tammikuuta 2024, 19.58.55 EET flow gg a écrit :
> Fixed the rv32 break in this reply
It looks like widening add would avoid the sign extension.
Although you'd need as many instructions, since V lacks signed to unsigned
clipping.
--
Rémi Denis-Courmont
Fixed the rv32 break in this reply
flow gg 于2024年1月31日周三 20:01写道：
>
>
From 0874f319e1c26aa0eeb5ed0d4e00d29aec4c5af8 Mon Sep 17 00:00:00 2001
From: sunyuechi
Date: Wed, 31 Jan 2024 19:04:11 +0800
Subject: [PATCH 4/4] lavc/rv34dsp: R-V V rv34_idct_dc_add
C908:
rv34_idct_dc_add_c: 134.7
From aec115a7179f23642c2b1c1a1cae3253a40c38fc Mon Sep 17 00:00:00 2001
From: sunyuechi
Date: Wed, 31 Jan 2024 19:04:11 +0800
Subject: [PATCH 4/4] lavc/rv34dsp: R-V V rv34_idct_dc_add
C908:
rv34_idct_dc_add_c: 134.7
rv34_idct_dc_add_rvv_i32: 45.5
---
libavcodec/riscv/rv34dsp_init.c | 2 ++
