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| author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-12-30 20:02:11 -0800 |
|---|---|---|
| committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2016-01-04 17:23:24 -0800 |
| commit | 43624a669b706168989a3b1ac608943f8cb208d1 (patch) | |
| tree | 51d487a949ce4a741adad531d500101fc94a65ca /libavcodec/alpha/mpegvideo_alpha.c | |
| parent | 7cc01c25727a96eaaa0c177234b626e47c8ea491 (diff) | |
| download | ffmpeg-43624a669b706168989a3b1ac608943f8cb208d1.tar.gz | |
lavc/pcm_tablegen: slight speedup of table generation
This gets rid of some branches to speed up table generation slightly
(impact higher on mulaw than alaw). Tables are identical to before,
tested with FATE.
Sample benchmark (Haswell, GNU/Linux+gcc):
old:
313494 decicycles in build_alaw_table, 4094 runs, 2 skips
315959 decicycles in build_alaw_table, 8190 runs, 2 skips
323599 decicycles in build_ulaw_table, 4095 runs, 1 skips
318849 decicycles in build_ulaw_table, 8188 runs, 4 skips
new:
261902 decicycles in build_alaw_table, 4096 runs, 0 skips
266519 decicycles in build_alaw_table, 8192 runs, 0 skips
209657 decicycles in build_ulaw_table, 4096 runs, 0 skips
232656 decicycles in build_ulaw_table, 8192 runs, 0 skips
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Diffstat (limited to 'libavcodec/alpha/mpegvideo_alpha.c')
0 files changed, 0 insertions, 0 deletions