linuxaudio.org

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

quoted text
> 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

quoted text
> 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

quoted text
> 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@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-user