Re: [FFmpeg-devel] [PATCH 2/4] lavc/rv34dsp: R-V V rv34_inv_transform_dc

[flow gg <hlefthleft@gmail.com>]

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Okay, I have updated them in the response

Rémi Denis-Courmont <remi@remlab.net> 于2024年2月10日周六 05:14写道：

> Le keskiviikkona 7. helmikuuta 2024, 2.12.22 EET flow gg a écrit :
> > My carelessness.. fixed it in the reply.
>
> I know I said to avoid scalar multiplications, but this may be taking it a
> little too far. Either this works:
>    slli t1, t0, 9
>    sh2add t0, t0, t0
>    sub t0, t1, t0
> or just:
>    li t1, 13 * 13 * 3
>    mul t0, t0, t1
>
> Also the second vsetvl seems pointless, unless you specifically meant that
> the
> pointer was aligned to 32 bits?
>
> --
> Rémi Denis-Courmont
> http://www.remlab.net/
>
>
>
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From 45ca0ac11eea21e30071551959edef50e3935a37 Mon Sep 17 00:00:00 2001
From: sunyuechi <sunyuechi@iscas.ac.cn>
Date: Wed, 31 Jan 2024 19:03:20 +0800
Subject: [PATCH 2/4] lavc/rv34dsp: R-V V rv34_inv_transform_dc

C908:
rv34_inv_transform_dc_c: 35.5
rv34_inv_transform_dc_rvv_i32: 27.0
---
 libavcodec/riscv/Makefile       |  2 ++
 libavcodec/riscv/rv34dsp_init.c | 39 +++++++++++++++++++++++++++++++++
 libavcodec/riscv/rv34dsp_rvv.S  | 33 ++++++++++++++++++++++++++++
 libavcodec/rv34dsp.c            |  2 ++
 libavcodec/rv34dsp.h            |  1 +
 5 files changed, 77 insertions(+)
 create mode 100644 libavcodec/riscv/rv34dsp_init.c
 create mode 100644 libavcodec/riscv/rv34dsp_rvv.S

diff --git a/libavcodec/riscv/Makefile b/libavcodec/riscv/Makefile
index e15aba58f4..ffe6631cf2 100644
--- a/libavcodec/riscv/Makefile
+++ b/libavcodec/riscv/Makefile
@@ -44,6 +44,8 @@ RVV-OBJS-$(CONFIG_OPUS_DECODER) += riscv/opusdsp_rvv.o
 OBJS-$(CONFIG_PIXBLOCKDSP) += riscv/pixblockdsp_init.o
 RV-OBJS-$(CONFIG_PIXBLOCKDSP) += riscv/pixblockdsp_rvi.o
 RVV-OBJS-$(CONFIG_PIXBLOCKDSP) += riscv/pixblockdsp_rvv.o
+OBJS-$(CONFIG_RV34DSP) += riscv/rv34dsp_init.o
+RVV-OBJS-$(CONFIG_RV34DSP) += riscv/rv34dsp_rvv.o
 OBJS-$(CONFIG_SVQ1_ENCODER) += riscv/svqenc_init.o
 RVV-OBJS-$(CONFIG_SVQ1_ENCODER) += riscv/svqenc_rvv.o
 OBJS-$(CONFIG_TAK_DECODER) += riscv/takdsp_init.o
diff --git a/libavcodec/riscv/rv34dsp_init.c b/libavcodec/riscv/rv34dsp_init.c
new file mode 100644
index 0000000000..852c8ad9a8
--- /dev/null
+++ b/libavcodec/riscv/rv34dsp_init.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2024 Institue of Software Chinese Academy of Sciences (ISCAS).
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/riscv/cpu.h"
+#include "libavcodec/rv34dsp.h"
+
+void ff_rv34_inv_transform_dc_rvv(int16_t *block);
+
+av_cold void ff_rv34dsp_init_riscv(RV34DSPContext *c)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if (flags & AV_CPU_FLAG_RVV_I32 && ff_get_rv_vlenb() >= 16) {
+        c->rv34_inv_transform_dc = ff_rv34_inv_transform_dc_rvv;
+    }
+#endif
+}
diff --git a/libavcodec/riscv/rv34dsp_rvv.S b/libavcodec/riscv/rv34dsp_rvv.S
new file mode 100644
index 0000000000..21c203c0c4
--- /dev/null
+++ b/libavcodec/riscv/rv34dsp_rvv.S
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2024 Institue of Software Chinese Academy of Sciences (ISCAS).
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/riscv/asm.S"
+
+func ff_rv34_inv_transform_dc_rvv, zve32x
+        lh            t1, 0(a0)
+        li            t0, 13 * 13 * 3
+        mul           t2, t0, t1
+        srai          t2, t2, 11
+        vsetivli      zero, 16, e16, m2, ta, ma
+        vmv.v.x       v8, t2
+        vse16.v       v8, (a0)
+
+        ret
+endfunc
diff --git a/libavcodec/rv34dsp.c b/libavcodec/rv34dsp.c
index 8f9d88396c..44486f8edd 100644
--- a/libavcodec/rv34dsp.c
+++ b/libavcodec/rv34dsp.c
@@ -138,6 +138,8 @@ av_cold void ff_rv34dsp_init(RV34DSPContext *c)
 
 #if ARCH_ARM
     ff_rv34dsp_init_arm(c);
+#elif ARCH_RISCV
+    ff_rv34dsp_init_riscv(c);
 #elif ARCH_X86
     ff_rv34dsp_init_x86(c);
 #endif
diff --git a/libavcodec/rv34dsp.h b/libavcodec/rv34dsp.h
index 2e9ec4eee4..b15424d4ae 100644
--- a/libavcodec/rv34dsp.h
+++ b/libavcodec/rv34dsp.h
@@ -79,6 +79,7 @@ void ff_rv34dsp_init(RV34DSPContext *c);
 void ff_rv40dsp_init(RV34DSPContext *c);
 
 void ff_rv34dsp_init_arm(RV34DSPContext *c);
+void ff_rv34dsp_init_riscv(RV34DSPContext *c);
 void ff_rv34dsp_init_x86(RV34DSPContext *c);
 
 void ff_rv40dsp_init_aarch64(RV34DSPContext *c);
-- 
2.43.0


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