Cycling 74 » Topic: denorm http://cycling74.com/forums/topic/denorm/feed Wed, 19 Jun 2013 01:13:07 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/denorm/#post-25281 <![CDATA[denorm]]> http://cycling74.com/forums/topic/denorm/#post-25281 Fri, 07 Apr 2006 11:06:54 +0000 Trond Lossius Hi,

I got some feedback from a user of one of my externals
(tl.crossover4~) that he is experiencing occasional bursts in CPU
usage. It might be that this is due to some denorm issues in the code
of the externals. I don’t have any experience with this, so I am
wondering if there are some suggestions about what to do with it, or
sample codes, possibly from other open-sourced 3rd party externals,
that I could look into.

Thanks,
Trond

]]> http://cycling74.com/forums/topic/denorm/#post-74279 <![CDATA[Re: denorm]]> http://cycling74.com/forums/topic/denorm/#post-74279 Fri, 07 Apr 2006 12:34:48 +0000 Timothy Place Hi Trond,

Here is an example of code calling a function that fixes denormals from ttblue:
http://svn.sourceforge.net/viewcvs.cgi/ttblue/trunk/ttblue/d splib/tt_dcblock.h?r1=31&r2=39

And the definition of that function is at line 125 in this file:
http://svn.sourceforge.net/viewcvs.cgi/ttblue/trunk/ttblue/d splib/tt_audio_base.h?annotate=49

Because the function is in the class definition itself it will automatically be inlined by the compiler so you don’t incur a cpu hit for calling the function. Basically it is adding and subtracting a small number such that the round-off error makes the number that is returned no longer denormalled.

I hope this is useful…
-Tim

]]> http://cycling74.com/forums/topic/denorm/#post-74280 <![CDATA[Re: denorm]]> http://cycling74.com/forums/topic/denorm/#post-74280 Fri, 07 Apr 2006 12:38:17 +0000 Trond Lossius Absolutely!

Thanks,
Trond

]]> http://cycling74.com/forums/topic/denorm/#post-74281 <![CDATA[Re: denorm]]> http://cycling74.com/forums/topic/denorm/#post-74281 Fri, 07 Apr 2006 14:55:26 +0000 Timothy Place I forgot to include this piece of information (which is defined in the base cpp file):

const double tt_audio_base::anti_denormal_value = 1e-18;

best,
Tim

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