Files
ffmpeg/libavcodec
Charly Morgand-Poyac 6179982c9c avcodec/x86/cabac: compute renormalisation shifts with lzcnt
The norm_shift loads sit on the serial range dependency chain and
cost several cycles where lzcnt costs one. Builds targeting CPUs
without LZCNT keep the exact original code. About 1.5% faster CABAC
heavy H.264 and HEVC decoding.

Signed-off-by: Charly Morgand-Poyac <charly.morgand-poyac@bbright.com>
2026-07-11 14:23:12 +00:00
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