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VSX Version of vpx_sub_pixel_variance #24

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luctrudeau opened this issue Jun 4, 2018 · 1 comment
Open
7 tasks

VSX Version of vpx_sub_pixel_variance #24

luctrudeau opened this issue Jun 4, 2018 · 1 comment
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big potential speedup enhancement

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@luctrudeau
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luctrudeau commented Jun 4, 2018 •
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Implement a VSX version of :

  • vpx_sub_pixel_variance8x8
  • vpx_sub_pixel_variance16x16
  • vpx_sub_pixel_variance32x32
  • vpx_sub_pixel_variance64x64

Each function must:

  • Pass the VpxSubpelVarianceTest suite
  • Include Speed Test to the VpxSubpelVarianceTest suite (Disabled by default)
  • Report performance in commit msg (compared to C version)
    • Must show significant speedup over C version
@luctrudeau
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luctrudeau commented Jun 27, 2018 •
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Currently in libVPX, subpixel variance accounts for more than 15% of the run time for YouTube like encodes.

% Function
5.59 vpx_sub_pixel_variance8x8_c
4.24 vpx_sub_pixel_variance16x16_c
3.25 vpx_sub_pixel_variance32x32_c
2.64 vpx_sub_pixel_variance64x64_c

There's a big potential here for speed ups.

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