Re: [linux-audio-dev] Denormalisation considered harmful?

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Subject: Re: [linux-audio-dev] Denormalisation considered harmful?
From: eli+@gs211.sp.cs.cmu.edu
Date: Wed Dec 13 2000 - 00:18:20 EET


Steve Harris wrote:
> OK, Sounds reasonable, denormalise didn't quite seem like the right word
> to me either, but I didn't really understand it! To be honest I havn't
> done any real measurments to see how much it helps, but it did seem to
> stop the exceptional slowdowns when feeding in a stream of very low
> numbers.

It depends on how often you check for denormals, which I haven't tried
to optimize, but I get numbers like this for an iterated multiply:

                naive FTZ() add DC
normalized 10.0 10.6 10.3 cycles/iteration
denormal 260 11.1 11.5

-- 
     Eli Brandt  |  eli+@cs.cmu.edu  |  http://www.cs.cmu.edu/~eli/


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