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FFmpeg/libavfilter
Niklas Haas bc8d06d541 avfilter/vf_thumbnail: unroll and use multiple histograms
This naive hist[p[x]]++ loop suffers badly when there are large regions of
identical values in the image, because of store-to-load forwarding delay.

Splitting up the histogram into four "parallel" histograms and processing
them one at a time speeds things up significantly, about 40% on my end.
2025-07-17 12:33:59 +02:00
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