ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Wed Oct 7 17:57:58 2015 +0200| [1bc873acd6e15eaca8c2aebfd7dc6472b0429c50] | committer: Michael Niedermayer
swresample/resample: manually unroll the main loop in bessel() About 10% faster Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1bc873acd6e15eaca8c2aebfd7dc6472b0429c50 --- libswresample/resample.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/libswresample/resample.c b/libswresample/resample.c index d6737d9..036eff3 100644 --- a/libswresample/resample.c +++ b/libswresample/resample.c @@ -51,11 +51,13 @@ static double bessel(double x){ x= x*x/4; t = x; v = 1 + x; - for(i=1; v != lastv; i++){ - lastv=v; + for(i=1; v != lastv; i+=2){ t *= x*inv[i]; v += t; - av_assert2(i<99); + lastv=v; + t *= x*inv[i + 1]; + v += t; + av_assert2(i<98); } return v; } _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
