lavc/fmtconvert: RISC-V V int32_to_float_fmul_scalar

libavcodec/fmtconvert.c

@@ -52,6 +52,8 @@ av_cold void ff_fmt_convert_init(FmtConvertContext *c)
     ff_fmt_convert_init_arm(c);
 #elif ARCH_PPC
     ff_fmt_convert_init_ppc(c);
+#elif ARCH_RISCV
+    ff_fmt_convert_init_riscv(c);
 #elif ARCH_X86
     ff_fmt_convert_init_x86(c);
 #endif

libavcodec/fmtconvert.h

@@ -61,6 +61,7 @@ void ff_fmt_convert_init(FmtConvertContext *c);
 void ff_fmt_convert_init_aarch64(FmtConvertContext *c);
 void ff_fmt_convert_init_arm(FmtConvertContext *c);
 void ff_fmt_convert_init_ppc(FmtConvertContext *c);
+void ff_fmt_convert_init_riscv(FmtConvertContext *c);
 void ff_fmt_convert_init_x86(FmtConvertContext *c);
 void ff_fmt_convert_init_mips(FmtConvertContext *c);
 

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

libavcodec/riscv/fmtconvert_init.c

@@ -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 "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)
+{
+#ifdef HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if (flags & AV_CPU_FLAG_RVV_F32)
+        c->int32_to_float_fmul_scalar = ff_int32_to_float_fmul_scalar_rvv;
+#endif
+}

libavcodec/riscv/fmtconvert_rvv.S

@@ -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 "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)
+        sub         a2, a2, t0
+        vfcvt.f.x.v v24, v24
+        sh2add      a1, t0, a1
+        vfmul.vf    v24, v24, fa0
+        vse32.v     v24, (a0)
+        sh2add      a0, t0, a0
+        bnez        a2, 1b
+
+        ret
+endfunc