[FFmpeg-devel] [PATCH 2/3] lavc/h264dsp: R-V V h264_add_pixels4_clear

[flow gg <hlefthleft@gmail.com>]

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C908
h264_add_pixels4_clear_c: 96.0
h264_add_pixels4_clear_rvv_i64: 30.2

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From 8b2838516915c27aa2831e797c2c41ad1d1bae1b Mon Sep 17 00:00:00 2001
From: sunyuechi <sunyuechi@iscas.ac.cn>
Date: Mon, 25 Dec 2023 00:06:28 +0800
Subject: [PATCH 2/3] lavc/h264dsp: R-V V h264_add_pixels4_clear

C908
h264_add_pixels4_clear_c: 96.0
h264_add_pixels4_clear_rvv_i64: 30.2

The number of vsets can be reduced, but that would lead to a change in the order of instructions, thus making it slower.
---
 libavcodec/h264dsp.c            |  2 ++
 libavcodec/h264dsp.h            |  2 ++
 libavcodec/riscv/Makefile       |  2 ++
 libavcodec/riscv/h264dsp_init.c | 41 ++++++++++++++++++++++++++++++++
 libavcodec/riscv/h264dsp_rvv.S  | 42 +++++++++++++++++++++++++++++++++
 5 files changed, 89 insertions(+)
 create mode 100644 libavcodec/riscv/h264dsp_init.c
 create mode 100644 libavcodec/riscv/h264dsp_rvv.S

diff --git a/libavcodec/h264dsp.c b/libavcodec/h264dsp.c
index 4d2ee10bab..1ba936be1c 100644
--- a/libavcodec/h264dsp.c
+++ b/libavcodec/h264dsp.c
@@ -158,6 +158,8 @@ av_cold void ff_h264dsp_init(H264DSPContext *c, const int bit_depth,
     ff_h264dsp_init_arm(c, bit_depth, chroma_format_idc);
 #elif ARCH_PPC
     ff_h264dsp_init_ppc(c, bit_depth, chroma_format_idc);
+#elif ARCH_RISCV
+    ff_h264dsp_init_riscv(c, bit_depth, chroma_format_idc);
 #elif ARCH_X86
     ff_h264dsp_init_x86(c, bit_depth, chroma_format_idc);
 #elif ARCH_MIPS
diff --git a/libavcodec/h264dsp.h b/libavcodec/h264dsp.h
index e0880c4d88..d940343b4a 100644
--- a/libavcodec/h264dsp.h
+++ b/libavcodec/h264dsp.h
@@ -125,6 +125,8 @@ void ff_h264dsp_init_arm(H264DSPContext *c, const int bit_depth,
                          const int chroma_format_idc);
 void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth,
                          const int chroma_format_idc);
+void ff_h264dsp_init_riscv(H264DSPContext *c, const int bit_depth,
+                         const int chroma_format_idc);
 void ff_h264dsp_init_x86(H264DSPContext *c, const int bit_depth,
                          const int chroma_format_idc);
 void ff_h264dsp_init_mips(H264DSPContext *c, const int bit_depth,
diff --git a/libavcodec/riscv/Makefile b/libavcodec/riscv/Makefile
index 35ad149326..7f253bba12 100644
--- a/libavcodec/riscv/Makefile
+++ b/libavcodec/riscv/Makefile
@@ -23,6 +23,8 @@ OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_init.o
 RVV-OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_rvv.o
 OBJS-$(CONFIG_G722DSP) += riscv/g722dsp_init.o
 RVV-OBJS-$(CONFIG_G722DSP) += riscv/g722dsp_rvv.o
+OBJS-$(CONFIG_H264DSP) += riscv/h264dsp_init.o
+RVV-OBJS-$(CONFIG_H264DSP) += riscv/h264dsp_rvv.o
 OBJS-$(CONFIG_JPEG2000_DECODER) += riscv/jpeg2000dsp_init.o
 RVV-OBJS-$(CONFIG_JPEG2000_DECODER) += riscv/jpeg2000dsp_rvv.o
 OBJS-$(CONFIG_H264CHROMA) += riscv/h264_chroma_init_riscv.o
diff --git a/libavcodec/riscv/h264dsp_init.c b/libavcodec/riscv/h264dsp_init.c
new file mode 100644
index 0000000000..2538bc01a5
--- /dev/null
+++ b/libavcodec/riscv/h264dsp_init.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2023 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 <stdint.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/riscv/cpu.h"
+#include "libavcodec/h264dsp.h"
+
+void ff_h264_add_pixels4_clear_rvv(uint8_t *dst, int16_t *block, int stride);
+
+av_cold void ff_h264dsp_init_riscv(H264DSPContext *c, const int bit_depth, const int chroma_format_idc)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if (flags & AV_CPU_FLAG_RVV_I64) {
+        if (bit_depth == 8) {
+            c->h264_add_pixels4_clear = ff_h264_add_pixels4_clear_rvv;
+        }
+    }
+#endif
+}
diff --git a/libavcodec/riscv/h264dsp_rvv.S b/libavcodec/riscv/h264dsp_rvv.S
new file mode 100644
index 0000000000..e6b943f57e
--- /dev/null
+++ b/libavcodec/riscv/h264dsp_rvv.S
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2023 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_h264_add_pixels4_clear_rvv, zve64x
+        vsetivli   zero, 4, e8, mf4, ta, ma
+        vle64.v    v24, (a1)
+        vsetivli   zero, 4*4, e16, m2, ta, ma
+        li         t0, 0xff
+        vand.vx    v24, v24, t0
+        addi       a1, a1, 4*4*2
+        vsetivli   zero, 4, e8, mf4, ta, ma
+        vse64.v    v0, (a1)
+        vsetivli   zero, 4*4, e8, m1, ta, ma
+        vnclipu.wi v24, v24, 0
+        vsetivli   zero, 2, e8, mf8, ta, ma
+        vle64.v    v8, (a0)
+        vsetivli   zero, 4*4, e8, m1, ta, ma
+        vadd.vv    v24, v24, v8
+        vsetivli   zero, 2, e8, mf8, ta, ma
+        vse64.v    v24, (a0)
+
+        ret
+endfunc
-- 
2.43.0


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