@@ -156,6 +156,8 @@ av_cold AVFloatDSPContext *avpriv_float_dsp_alloc(int bit_exact)
ff_float_dsp_init_arm(fdsp);
#elif ARCH_PPC
ff_float_dsp_init_ppc(fdsp, bit_exact);
+#elif ARCH_RISCV
+ ff_float_dsp_init_riscv(fdsp);
#elif ARCH_X86
ff_float_dsp_init_x86(fdsp);
#elif ARCH_MIPS
@@ -205,6 +205,7 @@ float avpriv_scalarproduct_float_c(const float *v1, const float *v2, int len);
void ff_float_dsp_init_aarch64(AVFloatDSPContext *fdsp);
void ff_float_dsp_init_arm(AVFloatDSPContext *fdsp);
void ff_float_dsp_init_ppc(AVFloatDSPContext *fdsp, int strict);
+void ff_float_dsp_init_riscv(AVFloatDSPContext *fdsp);
void ff_float_dsp_init_x86(AVFloatDSPContext *fdsp);
void ff_float_dsp_init_mips(AVFloatDSPContext *fdsp);
@@ -1 +1,3 @@
-OBJS += riscv/cpu.o
+OBJS += riscv/float_dsp_init.o \
+ riscv/cpu.o
+RVV-OBJS += riscv/float_dsp_rvv.o
new file mode 100644
@@ -0,0 +1,39 @@
+/*
+ * 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 "libavutil/float_dsp.h"
+
+void ff_vector_fmul_scalar_rvv(float *dst, const float *src, float mul,
+ int len);
+
+av_cold void ff_float_dsp_init_riscv(AVFloatDSPContext *fdsp)
+{
+#if HAVE_RVV
+ int flags = av_get_cpu_flags();
+
+ if (flags & AV_CPU_FLAG_RV_ZVE32F)
+ fdsp->vector_fmul_scalar = ff_vector_fmul_scalar_rvv;
+#endif
+}
new file mode 100644
@@ -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 "asm.S"
+
+// (a0) = (a1) * fa0 [0..a2-1]
+func ff_vector_fmul_scalar_rvv, zve32f
+NOHWF fmv.w.x fa0, a2
+NOHWF mv a2, a3
+1:
+ vsetvli t0, a2, e32, m1, ta, ma
+ slli t1, t0, 2
+ vle32.v v16, (a1)
+ add a1, a1, t1
+ vfmul.vf v16, v16, fa0
+ sub a2, a2, t0
+ vse32.v v16, (a0)
+ add a0, a0, t1
+ bnez a2, 1b
+
+ ret
+endfunc
From: Rémi Denis-Courmont <remi@remlab.net> This is based on existing code from the VLC git tree with two minor changes to account for the different function prototypes. --- libavutil/float_dsp.c | 2 ++ libavutil/float_dsp.h | 1 + libavutil/riscv/Makefile | 4 +++- libavutil/riscv/float_dsp_init.c | 39 +++++++++++++++++++++++++++++++ libavutil/riscv/float_dsp_rvv.S | 40 ++++++++++++++++++++++++++++++++ 5 files changed, 85 insertions(+), 1 deletion(-) create mode 100644 libavutil/riscv/float_dsp_init.c create mode 100644 libavutil/riscv/float_dsp_rvv.S