On Wed, Nov 04, 2015 at 22:08:27 -0500, Ganesh Ajjanagadde wrote: > This uses the trigonometric double and triple angle formulae to avoid > repeated (expensive) evaluation of libc's cos(). [...] > - y *= 0.3635819 - 0.4891775 * cos(w) + 0.1365995 * cos(2*w) - > 0.0106411 * cos(3*w); > + y *= 0.3635819 - 0.4891775 * cos(w) + 0.1365995 * > (2*cos(w)*cos(w)-1) - 0.0106411 * (4*cos(w)*cos(w)*cos(w) - 3*cos(w));
Q: Does the compilers' optimization ensure that cos(w) is evaluated only once? Thanks, Moritz _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
