Re: [FFmpeg-devel] [PATCH 4/4] lavc/bswapdsp: RISC-V V bswap16_buf

[Lynne <dev@lynne.ee>]

Oct 2, 2022, 13:55 by remi@remlab.net:

> From: Rémi Denis-Courmont <remi@remlab.net>
>
> ---
>  libavcodec/riscv/bswapdsp_init.c |  5 ++++-
>  libavcodec/riscv/bswapdsp_rvv.S  | 17 +++++++++++++++++
>  2 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/riscv/bswapdsp_init.c b/libavcodec/riscv/bswapdsp_init.c
> index c17b6b75bb..abe84ec1f7 100644
> --- a/libavcodec/riscv/bswapdsp_init.c
> +++ b/libavcodec/riscv/bswapdsp_init.c
> @@ -27,6 +27,7 @@
>  
>  void ff_bswap32_buf_rvb(uint32_t *dst, const uint32_t *src, int len);
>  void ff_bswap32_buf_rvv(uint32_t *dst, const uint32_t *src, int len);
> +void ff_bswap16_buf_rvv(uint16_t *dst, const uint16_t *src, int len);
>  
>  av_cold void ff_bswapdsp_init_riscv(BswapDSPContext *c)
>  {
> @@ -37,7 +38,9 @@ av_cold void ff_bswapdsp_init_riscv(BswapDSPContext *c)
>  c->bswap_buf = ff_bswap32_buf_rvb;
>  #endif
>  #if HAVE_RVV
> -    if (cpu_flags & AV_CPU_FLAG_RVV_I32)
> +    if (cpu_flags & AV_CPU_FLAG_RVV_I32) {
>  c->bswap_buf = ff_bswap32_buf_rvv;
> +        c->bswap16_buf = ff_bswap16_buf_rvv;
> +    }
>  #endif
>  }
> diff --git a/libavcodec/riscv/bswapdsp_rvv.S b/libavcodec/riscv/bswapdsp_rvv.S
> index 7ea747b3ce..ef2999c1be 100644
> --- a/libavcodec/riscv/bswapdsp_rvv.S
> +++ b/libavcodec/riscv/bswapdsp_rvv.S
> @@ -43,3 +43,20 @@ func ff_bswap32_buf_rvv, zve32x
>  
>  ret
>  endfunc
> +
> +func ff_bswap16_buf_rvv, zve32x
> +        li      t2, 2
> +        addi    t1, a0, 1
> +1:
> +        vsetvli    t0, a2, e8, m1, ta, ma
> +        vlseg2e8.v v8, (a1)
> +        sub        a2, a2, t0
> +        sh1add     a1, t0, a1
> +        vsse8.v    v8, (t1), t2
> +        sh1add     t1, t0, t1
> +        vsse8.v    v9, (a0), t2
> +        sh1add     a0, t0, a0
> +        bnez       a2, 1b
> +
> +        ret
> +endfunc
>

Pushed patchset with a minor bump and apichanges
Thanks
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