On Tue, Nov 24, 2015 at 2:28 PM, Michael Niedermayer <michae...@gmx.at> wrote: > On Tue, Nov 24, 2015 at 01:05:20PM -0500, Ganesh Ajjanagadde wrote: >> 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 >> >> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com> >> --- >> libavfilter/vsrc_mandelbrot.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) > > LGTM > > thx
pushed, thanks. > > [...] > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > In a rich man's house there is no place to spit but his face. > -- Diogenes of Sinope > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
