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Libavcodec - native NEON compile vs hybrid mode

By admin | October 4, 2012

Background

Benchmarks using the latest VLC beta and benching whether a native build solely for NEON is faster or a hybrid build. The expectation is that the native build should be very slightly faster than the hybrid build. This is done on a TI OMAP 4460 (Galaxy Nexus). Method is same as previous benchmarks.

Results

Ironically, it appears that the hybrid build is slightly faster(?) than the native NEON build, although in practice there is no real difference for the user. So the proper result should be inconclusive.

Hybrid mean 80.25% Native NEON mean 81.56%
Hybrid median 82.10% Native NEON median 82.80%

Libavcodec Native NEON mode vs hybrid mode

Raw data

Hybrid build:
19453   126 10079    R     575m 82.6   1 72.0 org.videolan.vlc
19453   126 10079    S     593m 85.3   1 64.4 org.videolan.vlc
19453   126 10079    S     594m 85.4   1 85.0 org.videolan.vlc
19453   126 10079    S     594m 85.5   0 83.1 org.videolan.vlc
19453   126 10079    S     594m 85.5   0 81.8 org.videolan.vlc
19453   126 10079    S     597m 85.9   0 77.9 org.videolan.vlc
19453   126 10079    S     597m 85.9   0 85.6 org.videolan.vlc
19453   126 10079    S     597m 85.9   0 85.5 org.videolan.vlc
19453   126 10079    S     598m 85.9   0 81.6 org.videolan.vlc
19453   126 10079    S     598m 86.0   0 82.1 org.videolan.vlc
19453   126 10079    S     598m 86.0   1 83.8 org.videolan.vlc

Native NEON build:
19703   126 10079    S     590m 84.8   0 68.4 org.videolan.vlc
19703   126 10079    S     589m 84.7   1 82.3 org.videolan.vlc
19703   126 10079    S     592m 85.1   1 81.1 org.videolan.vlc
19703   126 10079    S     592m 85.1   1 83.0 org.videolan.vlc
19703   126 10079    S     593m 85.2   1 81.0 org.videolan.vlc
19703   126 10079    S     593m 85.3   1 83.2 org.videolan.vlc
19703   126 10079    S     593m 85.3   1 82.8 org.videolan.vlc
19703   126 10079    S     594m 85.3   1 79.8 org.videolan.vlc
19703   126 10079    S     594m 85.4   1 83.8 org.videolan.vlc
19703   126 10079    S     594m 85.4   1 85.6 org.videolan.vlc
19703   126 10079    S     594m 85.4   1 86.2 org.videolan.vlc

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