On Sat, Jan 29, 2011 at 01:22:10PM +0100, Philipp Überbacher wrote: > I thought that log2() might use a different routine if the argument is a > power of 2. I guess that even if it does it's nothing to rely on because > another libm implementation might not do the same thing. There are very good reasons why math routines don't do such things. > Why did you choose 1e-6 specifically? It does the job. 1e-6f will also work for single precision. > ... Without optimisation the output is quite > different, but beginning with -O2 the machine code appears all the same. That could well be completely different on an another CPU and compiler, and even more so if tested ***in context***. Such tests are really pointless, in particular if you consider the actual use of this code. It isn't executed 100 times for each audio sample. > If the optimised code really is the same is it worth it to use funky bit > shifting operations? There's nothing funky about them, they are part of C and C++. Ciao, -- FA There are three of them, and Alleline. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
