[FFmpeg-devel] [PATCH 22/26] lavc/fmtconvert: RISC-V V int32_to_float_fmul_scalar

[remi@remlab.net]

From: Rémi Denis-Courmont <remi@remlab.net>

---
 libavcodec/fmtconvert.c            |  2 ++
 libavcodec/fmtconvert.h            |  1 +
 libavcodec/riscv/Makefile          |  2 ++
 libavcodec/riscv/fmtconvert_init.c | 41 ++++++++++++++++++++++++++++++
 libavcodec/riscv/fmtconvert_rvv.S  | 40 +++++++++++++++++++++++++++++
 5 files changed, 86 insertions(+)
 create mode 100644 libavcodec/riscv/fmtconvert_init.c
 create mode 100644 libavcodec/riscv/fmtconvert_rvv.S

diff --git a/libavcodec/fmtconvert.c b/libavcodec/fmtconvert.c
index 00f55f8f1e..8dcef82ee3 100644
--- a/libavcodec/fmtconvert.c
+++ b/libavcodec/fmtconvert.c
@@ -53,6 +53,8 @@ av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
     ff_fmt_convert_init_arm(c, avctx);
 #elif ARCH_PPC
     ff_fmt_convert_init_ppc(c, avctx);
+#elif ARCH_RISCV
+    ff_fmt_convert_init_riscv(c, avctx);
 #elif ARCH_X86
     ff_fmt_convert_init_x86(c, avctx);
 #endif
diff --git a/libavcodec/fmtconvert.h b/libavcodec/fmtconvert.h
index b2df7a9629..ca51d0861a 100644
--- a/libavcodec/fmtconvert.h
+++ b/libavcodec/fmtconvert.h
@@ -61,6 +61,7 @@ void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx);
 void ff_fmt_convert_init_aarch64(FmtConvertContext *c, AVCodecContext *avctx);
 void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx);
 void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx);
+void ff_fmt_convert_init_riscv(FmtConvertContext *c, AVCodecContext *avctx);
 void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx);
 void ff_fmt_convert_init_mips(FmtConvertContext *c);
 
diff --git a/libavcodec/riscv/Makefile b/libavcodec/riscv/Makefile
index 99541b075e..682174e875 100644
--- a/libavcodec/riscv/Makefile
+++ b/libavcodec/riscv/Makefile
@@ -1,5 +1,7 @@
 OBJS-$(CONFIG_AUDIODSP) += riscv/audiodsp_init.o \
                            riscv/audiodsp_rvf.o
 RVV-OBJS-$(CONFIG_AUDIODSP) += riscv/audiodsp_rvv.o
+OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_init.o
+RVV-OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_rvv.o
 OBJS-$(CONFIG_PIXBLOCKDSP) += riscv/pixblockdsp_init.o \
                               riscv/pixblockdsp_rvi.o
diff --git a/libavcodec/riscv/fmtconvert_init.c b/libavcodec/riscv/fmtconvert_init.c
new file mode 100644
index 0000000000..aa7d44ff5a
--- /dev/null
+++ b/libavcodec/riscv/fmtconvert_init.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright © 2022 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 "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavcodec/avcodec.h"
+#include "libavcodec/fmtconvert.h"
+
+void ff_int32_to_float_fmul_scalar_rvv(float *dst, const int32_t *src,
+                                       float mul, int len);
+
+av_cold void ff_fmt_convert_init_riscv(FmtConvertContext *c,
+                                       AVCodecContext *avctx)
+{
+#ifdef HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if (flags & AV_CPU_FLAG_RV_ZVE32F)
+        c->int32_to_float_fmul_scalar = ff_int32_to_float_fmul_scalar_rvv;
+#endif
+}
diff --git a/libavcodec/riscv/fmtconvert_rvv.S b/libavcodec/riscv/fmtconvert_rvv.S
new file mode 100644
index 0000000000..c19b77e38a
--- /dev/null
+++ b/libavcodec/riscv/fmtconvert_rvv.S
@@ -0,0 +1,40 @@
+/*
+ * Copyright © 2022 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 "config.h"
+#include "../libavutil/riscv/asm.S"
+
+func ff_int32_to_float_fmul_scalar_rvv, zve32f
+NOHWF   fmv.w.x     fa0, a2
+NOHWF   mv          a2, a3
+1:
+        vsetvli     t0, a2, e32, m1, ta, ma
+        vle32.v     v24, (a1)
+        slli        t1, t0, 2
+        vfcvt.f.x.v v24, v24
+        sub         a2, a2, t0
+        vfmul.vf    v24, v24, fa0
+        add         a1, a1, t1
+        vse32.v     v24, (a0)
+        add         a0, a0, t1
+        bnez        a2, 1b
+
+        ret
+endfunc
-- 
2.37.2

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