1. 14 Jan, 2017 1 commit
    • Martin Storsjö's avatar
      arm: vp9itxfm: Skip empty slices in the first pass of idct_idct 16x16 and 32x32 · 388f6e67
      Martin Storsjö authored
      This work is sponsored by, and copyright, Google.
      
      Previously all subpartitions except the eob=1 (DC) case ran with
      the same runtime:
      
                                           Cortex A7       A8       A9      A53
      vp9_inv_dct_dct_16x16_sub16_add_neon:   3188.1   2435.4   2499.0   1969.0
      vp9_inv_dct_dct_32x32_sub32_add_neon:  18531.7  16582.3  14207.6  12000.3
      
      By skipping individual 4x16 or 4x32 pixel slices in the first pass,
      we reduce the runtime of these functions like this:
      
      vp9_inv_dct_dct_16x16_sub1_add_neon:     274.6    189.5    211.7    235.8
      vp9_inv_dct_dct_16x16_sub2_add_neon:    2064.0   1534.8   1719.4   1248.7
      vp9_inv_dct_dct_16x16_sub4_add_neon:    2135.0   1477.2   1736.3   1249.5
      vp9_inv_dct_dct_16x16_sub8_add_neon:    2446.7   1828.7   1993.6   1494.7
      vp9_inv_dct_dct_16x16_sub12_add_neon:   2832.4   2118.3   2266.5   1735.1
      vp9_inv_dct_dct_16x16_sub16_add_neon:   3211.7   2475.3   2523.5   1983.1
      vp9_inv_dct_dct_32x32_sub1_add_neon:     756.2    456.7    862.0    553.9
      vp9_inv_dct_dct_32x32_sub2_add_neon:   10682.2   8190.4   8539.2   6762.5
      vp9_inv_dct_dct_32x32_sub4_add_neon:   10813.5   8014.9   8518.3   6762.8
      vp9_inv_dct_dct_32x32_sub8_add_neon:   11859.6   9313.0   9347.4   7514.5
      vp9_inv_dct_dct_32x32_sub12_add_neon:  12946.6  10752.4  10192.2   8280.2
      vp9_inv_dct_dct_32x32_sub16_add_neon:  14074.6  11946.5  11001.4   9008.6
      vp9_inv_dct_dct_32x32_sub20_add_neon:  15269.9  13662.7  11816.1   9762.6
      vp9_inv_dct_dct_32x32_sub24_add_neon:  16327.9  14940.1  12626.7  10516.0
      vp9_inv_dct_dct_32x32_sub28_add_neon:  17462.7  15776.1  13446.2  11264.7
      vp9_inv_dct_dct_32x32_sub32_add_neon:  18575.5  17157.0  14249.3  12015.1
      
      I.e. in general a very minor overhead for the full subpartition case due
      to the additional loads and cmps, but a significant speedup for the cases
      when we only need to process a small part of the actual input data.
      
      In common VP9 content in a few inspected clips, 70-90% of the non-dc-only
      16x16 and 32x32 IDCTs only have nonzero coefficients in the upper left
      8x8 or 16x16 subpartitions respectively.
      
      This is cherrypicked from libav commit
      9c8bc74c.
      Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
      388f6e67
  2. 27 Dec, 2016 1 commit
  3. 03 Aug, 2016 1 commit
  4. 27 Jul, 2016 1 commit
  5. 13 Oct, 2015 1 commit
    • Ronald S. Bultje's avatar
      vp9: add itxfm_add eob shortcuts to 10/12bpp functions. · eb4b5ff7
      Ronald S. Bultje authored
      These aren't quite as helpful as the ones in 8bpp, since over there,
      we can use pmulhrsw, but here the coefficients have too many bits to
      be able to take advantage of pmulhrsw. However, we can still skip
      cols for which all coefs are 0, and instead just zero the input data
      for the row itx. This helps a few % on overall decoding speed.
      eb4b5ff7
  6. 28 Sep, 2015 2 commits
  7. 26 Sep, 2015 3 commits
  8. 24 Sep, 2015 1 commit
  9. 22 Sep, 2015 1 commit
  10. 20 Sep, 2015 3 commits
  11. 16 Sep, 2015 1 commit
  12. 15 Sep, 2015 2 commits