Re: [FFmpeg-devel] [PATCH v2 3/5] libswscale: Avx2 hscale can process inputs of any size.

[Alan Kelly <alankelly-at-google.com@ffmpeg.org>]

Hi,

Are there any further comments on this patch or can it be committed?

Thanks,

Alan

On Tue, Apr 26, 2022 at 10:00 AM Alan Kelly <alankelly@google.com> wrote:

> The main loop processes blocks of 16 pixels. The tail processes blocks
> of size 4.
> ---
>  libswscale/x86/scale_avx2.asm | 44 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 43 insertions(+), 1 deletion(-)
>
> diff --git a/libswscale/x86/scale_avx2.asm b/libswscale/x86/scale_avx2.asm
> index 20acdbd633..7657b2825f 100644
> --- a/libswscale/x86/scale_avx2.asm
> +++ b/libswscale/x86/scale_avx2.asm
> @@ -53,6 +53,9 @@ cglobal hscale8to15_%1, 7, 9, 16, pos0, dst, w, srcmem,
> filter, fltpos, fltsize,
>      mova m14, [four]
>      shr fltsized, 2
>  %endif
> +    cmp wq, 16
> +    jl .tail_loop
> +    sub wq, 0x10
>  .loop:
>      movu m1, [fltposq]
>      movu m2, [fltposq+32]
> @@ -101,7 +104,46 @@ cglobal hscale8to15_%1, 7, 9, 16, pos0, dst, w,
> srcmem, filter, fltpos, fltsize,
>      add fltposq, 0x40
>      add countq, 0x10
>      cmp countq, wq
> -    jl .loop
> +    jle .loop
> +
> +    add wq, 0x10
> +    cmp countq, wq
> +    jge .end
> +
> +.tail_loop:
> +    movu xm1, [fltposq]
> +%ifidn %1, X4
> +    pxor xm9, xm9
> +    pxor xm10, xm10
> +    xor innerq, innerq
> +.tail_innerloop:
> +%endif
> +    vpcmpeqd  xm13, xm13
> +    vpgatherdd xm3,[srcmemq + xm1], xm13
> +    vpunpcklbw xm5, xm3, xm0
> +    vpunpckhbw xm6, xm3, xm0
> +    vpmaddwd xm5, xm5, [filterq]
> +    vpmaddwd xm6, xm6, [filterq + 16]
> +    add filterq, 0x20
> +%ifidn %1, X4
> +    paddd xm9, xm5
> +    paddd xm10, xm6
> +    paddd xm1, xm14
> +    add innerq, 1
> +    cmp innerq, fltsizeq
> +    jl .tail_innerloop
> +    vphaddd xm5, xm9, xm10
> +%else
> +    vphaddd xm5, xm5, xm6
> +%endif
> +    vpsrad  xm5, 7
> +    vpackssdw xm5, xm5, xm5
> +    vmovq [dstq + countq * 2], xm5
> +    add fltposq, 0x10
> +    add countq, 0x4
> +    cmp countq, wq
> +    jl .tail_loop
> +.end:
>  REP_RET
>  %endmacro
>
> --
> 2.36.0.rc2.479.g8af0fa9b8e-goog
>
>
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