[linux-audio-dev] swh plugins and fixing undenormalize

[Tim Blechmann]

On Fri, 25 Jun 2004 17:38:24 -0500
Jan Depner <eviltwin69 at cableone.net> wrote:

> On Fri, 2004-06-25 at 13:49, Tim Blechmann wrote:
> > > I have a denormal fix without a branch but you probably don't want
> > > to see it ;-)
> > >  It's pretty simple, just OR the bits of the exponent together
> > >  which gives either
> > > 0 (denormal) or 1, typecast that to float, and then multiply the
> > > original float by that (0.0 or 1.0).  Voila, no branch, but it is
> > > messy looking ;-)
> > 
> > there is one problem ... if you multiply the denormal number with
> > the 1 or 0, you will probably have one denormal operation on the cpu
> > instead of a branch ... i don't know, that's worse ...
> > but definitely, some benchmarks would be useful for any denormal
> > flushing algorithm...
> > 
> 
> 	The definition of denormal is that the exponent is 0 so you will
> 	never
> multiply a denormal by 1, only by 0.  I'm not sure whether that would
> be a denormal operation or not.  It depends on the compiler.

hm ... someone should write a test for all these algorithms ... i'm
curious, how different compilers / different algorithms actually affect
the speed of the code ...

cheers.... tim

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