Subject: Re: [linux-audio-dev] swh plugins and fixing undenormalize
From: Jan Depner (eviltwin69_AT_cableone.net)
Date: Sun Jun 27 2004 - 18:44:28 EEST
On Sun, 2004-06-27 at 07:43, Tim Goetze wrote:
> [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 ;-)
>
> indeed sounds more like a fun proposal; nonetheless i'm wondering how
> many cycles 'ORing the exponent bits together' would take. with an
> 8-bit exponent and no assumption about its value made, 8 binary
> 'shift', 7 'or' and 1 'and' statement if i'm not badly mistaken. and
> if i'm not, a branch will probably hurt less.
>
That's why I said you probably don't want to see it. I did it mostly
for fun. When I finished coding it I was laughing too hard to test it.
Jan
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