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 [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB In a rich man's house there is no place to spit but his face. -- Diogenes of Sinope
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