tree 9f7215fc9a26c85f128e4b9d78bfe1a50e8639b1
parent f311099b0ac19281a7a39f05ff5be2d6cade73a8
author Jerome Jiang <jianj@google.com> 1782919597 -0400
committer Jerome Jiang <jianj@google.com> 1783522165 -0700

av1: Add AVX512 Highway Convolve2DSR

Optimizations:
  - Pack 4 rows of pixels into 512-bit vectors to process
    them in parallel horizontally.
  - Use table lookups for horizontal filtering and pairwise
    accumulation for vertical filtering.
  - Avoid intermediate buffer (strip_im_buf) for small
    heights (4 and 8) to reduce memory bandwidth.
  - Move shared shuffle masks to namespace level as constexpr.

Block Size │ AVX2 Avg (ns) │ AVX512 Avg (ns) │ AVX512 Speedup (x)
───────────┼───────────────┼─────────────────┼────────────────────
 4x4       │     17.91     │      14.31      │       1.25x
 4x8       │     20.87     │      18.33      │       1.14x
 4x16      │     27.58     │      30.30      │       0.91x
 8x4       │     20.02     │      14.37      │       1.39x
 8x8       │     27.70     │      20.28      │       1.37x
 8x16      │     38.81     │      32.35      │       1.20x
 8x32      │     62.95     │      49.74      │       1.27x
 16x4      │     29.15     │      22.31      │       1.31x
 16x8      │     43.59     │      34.40      │       1.27x
 16x16     │     66.83     │      61.15      │       1.09x
 16x32     │    113.91     │      94.32      │       1.21x
 16x64     │    211.02     │     170.10      │       1.24x
 32x8      │     77.16     │      63.79      │       1.21x
 32x16     │    123.99     │     115.51      │       1.07x
 32x32     │    219.35     │     181.74      │       1.21x
 32x64     │    409.66     │     335.28      │       1.22x
 64x16     │    242.50     │     224.55      │       1.08x
 64x32     │    430.87     │     357.05      │       1.21x
 64x64     │    815.89     │     664.01      │       1.23x
 64x128    │   1,590.23    │    1,289.34     │       1.23x
 128x64    │   1,634.32    │    1,330.22     │       1.23x
 128x128   │   3,243.12    │    2,573.41     │       1.26x

Change-Id: Idd4503ac2fb001c575bc93013982df9de6d7d38b