Skip to content
Snippets Groups Projects

AArch64: Optimize Armv8.0 Neon path of SBD H/HV 6-tap filters

Merged AArch64: Optimize Armv8.0 Neon path of SBD H/HV 6-tap filters
arpadpanyik-arm/dav1d:mc_sbd_h_hv_6tap_neon into master
Merged Arpad Panyik requested to merge arpadpanyik-arm/dav1d:mc_sbd_h_hv_6tap_neon into master
  1. Sep 06, 2024
    • Arpad Panyik's avatar
      AArch64: Optimize Armv8.0 Neon path of SBD H/HV 6-tap filters · a992a9be
      Arpad Panyik authored and Martin Storsjö's avatar Martin Storsjö committed 
      The 6-tap horizontal and the horizontal parts of 6-tap HV subpel
filters can be further improved by some pointer arithmetic and saving
some instructions (EXTs) in their data rearrangement codes.

Relative runtime of micro benchmarks after this patch on Cortex CPU
cores:

SBD mct h         X1     A78     A76     A72     A55
 regular  w8:  0.878x  0.894x  0.990x  0.923x  0.944x
 regular w16:  0.962x  0.931x  0.943x  0.949x  0.949x
 regular w32:  0.937x  0.937x  0.972x  0.938x  0.947x
 regular w64:  0.920x  0.965x  0.992x  0.936x  0.944x

SBD mct hv        X1     A78     A76     A72     A55
 regular  w8:  0.931x  0.970x  0.951x  0.950x  0.971x
 regular w16:  0.940x  0.971x  0.941x  0.952x  0.967x
 regular w32:  0.943x  0.972x  0.946x  0.961x  0.974x
 regular w64:  0.943x  0.973x  0.952x  0.944x  0.975x
      a992a9be

VideoLAN code repository instance