[FFmpeg-devel] [PATCH] lavc/exrdsp: R-V V reoder_pixels

["Rémi Denis-Courmont" <remi@remlab.net>]

---
 libavcodec/exrdsp.c            |  4 +++-
 libavcodec/exrdsp.h            |  1 +
 libavcodec/riscv/Makefile      |  2 ++
 libavcodec/riscv/exrdsp_init.c | 38 ++++++++++++++++++++++++++++++++++
 libavcodec/riscv/exrdsp_rvv.S  | 38 ++++++++++++++++++++++++++++++++++
 5 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100644 libavcodec/riscv/exrdsp_init.c
 create mode 100644 libavcodec/riscv/exrdsp_rvv.S

diff --git a/libavcodec/exrdsp.c b/libavcodec/exrdsp.c
index 8259da4841..752e1eb553 100644
--- a/libavcodec/exrdsp.c
+++ b/libavcodec/exrdsp.c
@@ -51,7 +51,9 @@ av_cold void ff_exrdsp_init(ExrDSPContext *c)
     c->reorder_pixels   = reorder_pixels_scalar;
     c->predictor        = predictor_scalar;
 
-#if ARCH_X86
+#if ARCH_RISCV
+    ff_exrdsp_init_riscv(c);
+#elif ARCH_X86
     ff_exrdsp_init_x86(c);
 #endif
 }
diff --git a/libavcodec/exrdsp.h b/libavcodec/exrdsp.h
index aba3d3cf51..ea37c8b08e 100644
--- a/libavcodec/exrdsp.h
+++ b/libavcodec/exrdsp.h
@@ -28,6 +28,7 @@ typedef struct ExrDSPContext {
 } ExrDSPContext;
 
 void ff_exrdsp_init(ExrDSPContext *c);
+void ff_exrdsp_init_riscv(ExrDSPContext *c);
 void ff_exrdsp_init_x86(ExrDSPContext *c);
 
 #endif /* AVCODEC_EXRDSP_H */
diff --git a/libavcodec/riscv/Makefile b/libavcodec/riscv/Makefile
index cc9c13e6b6..31ad493cd3 100644
--- a/libavcodec/riscv/Makefile
+++ b/libavcodec/riscv/Makefile
@@ -10,6 +10,8 @@ RVV-OBJS-$(CONFIG_AUDIODSP) += riscv/audiodsp_rvv.o
 OBJS-$(CONFIG_BSWAPDSP) += riscv/bswapdsp_init.o \
                            riscv/bswapdsp_rvb.o
 RVV-OBJS-$(CONFIG_BSWAPDSP) += riscv/bswapdsp_rvv.o
+OBJS-$(CONFIG_EXR_DECODER) += riscv/exrdsp_init.o
+RVV-OBJS-$(CONFIG_EXR_DECODER) += riscv/exrdsp_rvv.o
 OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_init.o
 RVV-OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_rvv.o
 OBJS-$(CONFIG_G722DSP) += riscv/g722dsp_init.o
diff --git a/libavcodec/riscv/exrdsp_init.c b/libavcodec/riscv/exrdsp_init.c
new file mode 100644
index 0000000000..690a2231c5
--- /dev/null
+++ b/libavcodec/riscv/exrdsp_init.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2023 Rémi Denis-Courmont.
+ *
+ * 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/cpu.h"
+#include "libavcodec/avcodec.h"
+#include "libavcodec/exrdsp.h"
+
+void ff_reorder_pixels_rvv(uint8_t *dst, const uint8_t *src, ptrdiff_t size);
+
+av_cold void ff_exrdsp_init_riscv(ExrDSPContext *c)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if ((flags & AV_CPU_FLAG_RVV_I32) && (flags & AV_CPU_FLAG_RVB_ADDR)) {
+        c->reorder_pixels = ff_reorder_pixels_rvv;
+    }
+#endif
+}
diff --git a/libavcodec/riscv/exrdsp_rvv.S b/libavcodec/riscv/exrdsp_rvv.S
new file mode 100644
index 0000000000..f4a35f58ff
--- /dev/null
+++ b/libavcodec/riscv/exrdsp_rvv.S
@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2023 Rémi Denis-Courmont.
+ *
+ * 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_reorder_pixels_rvv, zve32x
+        srai    a2, a2, 1
+        add     t1, a1, a2
+1:
+        vsetvli t0, a2, e8, m4, ta, ma
+        vle8.v  v0, (a1)
+        sub     a2, a2, t0
+        vle8.v  v4, (t1)
+        add     a1, t0, a1
+        vsseg2e8.v v0, (a0)
+        add     t1, t0, t1
+        sh1add  a0, t0, a0
+        bnez    a2, 1b
+
+        ret
+endfunc
-- 
2.42.0

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