[FFmpeg-devel] [PATCH] WIP: lavc/flacdsp: R-V Zvl256b lpc33

[Rémi Denis-Courmont]

Le perjantaina 24. toukokuuta 2024, 23.04.40 EEST Rémi Denis-Courmont a écrit 
:
> flac_lpc_33_13_c: 499.7
> flac_lpc_33_13_rvv_i64: 197.7
> flac_lpc_33_16_c: 601.5
> flac_lpc_33_16_rvv_i64: 195.2
> flac_lpc_33_29_c: 1011.5
> flac_lpc_33_29_rvv_i64: 300.7
> flac_lpc_33_32_c: 1099.0
> flac_lpc_33_32_rvv_i64: 296.7

Ignore the "WIP: " in the subject.

> ---
>  libavcodec/riscv/flacdsp_init.c |  7 +++++--
>  libavcodec/riscv/flacdsp_rvv.S  | 27 +++++++++++++++++++++++++++
>  2 files changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/libavcodec/riscv/flacdsp_init.c
> b/libavcodec/riscv/flacdsp_init.c index 830ae36534..861276be28 100644
> --- a/libavcodec/riscv/flacdsp_init.c
> +++ b/libavcodec/riscv/flacdsp_init.c
> @@ -31,6 +31,8 @@ void ff_flac_lpc32_rvv(int32_t *decoded, const int
> coeffs[32], int pred_order, int qlevel, int len);
>  void ff_flac_lpc32_rvv_simple(int32_t *decoded, const int coeffs[32],
>                                int pred_order, int qlevel, int len);
> +void ff_flac_lpc33_rvv(int64_t *, const int32_t *, const int coeffs[32],
> +                       int pred_order, int qlevel, int len);
>  void ff_flac_wasted32_rvv(int32_t *, int shift, int len);
>  void ff_flac_wasted33_rvv(int64_t *, const int32_t *, int shift, int len);
>  void ff_flac_decorrelate_indep2_16_rvv(uint8_t **out, int32_t **in,
> @@ -76,9 +78,10 @@ av_cold void ff_flacdsp_init_riscv(FLACDSPContext *c,
> enum AVSampleFormat fmt,
> 
>  # if (__riscv_xlen >= 64)
>              if (flags & AV_CPU_FLAG_RVV_I64) {
> -                if (vlenb > 16)
> +                if (vlenb > 16) {
>                      c->lpc32 = ff_flac_lpc32_rvv_simple;
> -                else
> +                    c->lpc33 = ff_flac_lpc33_rvv;
> +                } else
>                      c->lpc32 = ff_flac_lpc32_rvv;
>              }
>  # endif
> diff --git a/libavcodec/riscv/flacdsp_rvv.S b/libavcodec/riscv/flacdsp_rvv.S
> index 0e10940f74..ea42f8bea4 100644
> --- a/libavcodec/riscv/flacdsp_rvv.S
> +++ b/libavcodec/riscv/flacdsp_rvv.S
> @@ -103,6 +103,33 @@ func ff_flac_lpc32_rvv_simple, zve64x, zbb
> 
>          ret
>  endfunc
> +
> +func ff_flac_lpc33_rvv, zve64x, zbb
> +        vtype_vli t0, a3, t1, e64, ta, ma
> +        vsetvl  zero, a3, t0
> +        vmv.s.x v0, zero
> +        sh2add  a1, a3, a1
> +        vle32.v v24, (a2)
> +        sub     a5, a5, a3
> +        vle64.v v16, (a0)
> +        sh3add  a0, a3, a0
> +        vsext.vf2 v8, v24
> +1:
> +        vmul.vv v24, v8, v16
> +        lw      t0, (a1)
> +        addi    a1, a1, 4
> +        vredsum.vs v24, v24, v0
> +        addi    a5, a5, -1
> +        vmv.x.s t1, v24
> +        sra     t1, t1, a4
> +        add     t0, t0, t1
> +        vslide1down.vx v16, v16, t0
> +        sd      t0, (a0)
> +        addi    a0, a0, 8
> +        bnez    a5, 1b
> +
> +        ret
> +endfunc
>  #endif
> 
>  func ff_flac_wasted32_rvv, zve32x


-- 
Rémi Denis-Courmont
http://www.remlab.net/