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author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-11-24 13:00:54 -0500 |
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committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-11-24 20:36:40 -0500 |
commit | 990619968a40ff64f789ba7d004a118351695fa6 (patch) | |
tree | 7b4f43bb6211650d05ce2048f822c7cf0b22acf8 /libavutil/murmur3.c | |
parent | e9c7493f19a610f44690ef2f2f3737a3c6236fdf (diff) | |
download | ffmpeg-990619968a40ff64f789ba7d004a118351695fa6.tar.gz |
avfilter/vsrc_mandelbrot: change sin to sinf for color computation
lrintf is anyway used, suggesting we only care up to floating precision.
Rurthermore, there is a compat hack in avutil/libm for this function,
and it is used in avcodec/aacps_tablegen.h.
This yields a non-negligible speedup. Sample benchmark:
x86-64, Haswell, GNU/Linux:
old (draw_mandelbrot):
274635709 decicycles in draw_mandelbrot, 256 runs, 0 skips
300287046 decicycles in draw_mandelbrot, 512 runs, 0 skips
371819935 decicycles in draw_mandelbrot, 1024 runs, 0 skips
336663765 decicycles in draw_mandelbrot, 2048 runs, 0 skips
581851016 decicycles in draw_mandelbrot, 4096 runs, 0 skips
new (draw_mandelbrot):
269882717 decicycles in draw_mandelbrot, 256 runs, 0 skips
296359285 decicycles in draw_mandelbrot, 512 runs, 0 skips
370076599 decicycles in draw_mandelbrot, 1024 runs, 0 skips
331478354 decicycles in draw_mandelbrot, 2048 runs, 0 skips
571904318 decicycles in draw_mandelbrot, 4096 runs, 0 skips
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Diffstat (limited to 'libavutil/murmur3.c')
0 files changed, 0 insertions, 0 deletions