Rémi Denis-Courmont:
> C908:
> scalarproduct_double_c: 39.2
> scalarproduct_double_rvv_f64: 10.5
>
> X60:
> scalarproduct_double_c: 35.0
> scalarproduct_double_rvv_f64: 5.2
> ---
> libavutil/riscv/float_dsp_init.c | 3 +++
> libavutil/riscv/float_dsp_rvv.S | 21 +++++++++++++++++++++
> 2 files changed, 24 insertions(+)
>
> diff --git a/libavutil/riscv/float_dsp_init.c
> b/libavutil/riscv/float_dsp_init.c
> index 585f237225..155496fa6b 100644
> --- a/libavutil/riscv/float_dsp_init.c
> +++ b/libavutil/riscv/float_dsp_init.c
> @@ -46,6 +46,8 @@ void ff_vector_dmac_scalar_rvv(double *dst, const double
> *src, double mul,
> int len);
> void ff_vector_dmul_scalar_rvv(double *dst, const double *src, double mul,
> int len);
> +double ff_scalarproduct_double_rvv(const double *v1, const double *v2,
> + size_t len);
>
> av_cold void ff_float_dsp_init_riscv(AVFloatDSPContext *fdsp)
> {
> @@ -68,6 +70,7 @@ av_cold void ff_float_dsp_init_riscv(AVFloatDSPContext
> *fdsp)
> fdsp->vector_dmul = ff_vector_dmul_rvv;
> fdsp->vector_dmac_scalar = ff_vector_dmac_scalar_rvv;
> fdsp->vector_dmul_scalar = ff_vector_dmul_scalar_rvv;
> + fdsp->scalarproduct_double = ff_scalarproduct_double_rvv;
> }
> }
> #endif
> diff --git a/libavutil/riscv/float_dsp_rvv.S b/libavutil/riscv/float_dsp_rvv.S
> index 7cfc890bc2..4379534af7 100644
> --- a/libavutil/riscv/float_dsp_rvv.S
> +++ b/libavutil/riscv/float_dsp_rvv.S
> @@ -237,3 +237,24 @@ NOHWD mv a2, a3
>
> ret
> endfunc
> +
> +func ff_scalarproduct_double_rvv, zve64f
> + vsetvli t0, zero, e64, m8, ta, ma
> + vmv.v.x v8, zero
> + vmv.s.x v0, zero
> +1:
> + vsetvli t0, a2, e64, m8, tu, ma
> + vle64.v v16, (a0)
> + sub a2, a2, t0
> + vle64.v v24, (a1)
> + sh3add a0, t0, a0
> + vfmacc.vv v8, v16, v24
> + sh3add a1, t0, a1
> + bnez a2, 1b
> +
> + vsetvli t0, zero, e64, m8, ta, ma
> + vfredusum.vs v0, v8, v0
> + vfmv.f.s fa0, v0
> +NOHWD fmv.x.w a0, fa0
> + ret
> +endfunc
s/lavc/lavu/
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