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

New Message Reply About this list Date view Thread view Subject view Author view Other groups

Subject: Re: [linux-audio-dev] swh plugins and fixing undenormalize
From: Tim Blechmann (TimBlechmann_AT_gmx.net)
Date: Sat Jun 26 2004 - 11:42:10 EEST

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 

-- 
mailto:TimBlechmann_AT_gmx.de    ICQ: 96771783

After one look at this planet any visitor from outer space 
would say "I want to see the manager."
				      William S. Burroughs

New Message Reply About this list Date view Thread view Subject view Author view Other groups

This archive was generated by hypermail 2b28 : Sat Jun 26 2004 - 16:38:07 EEST