[PD] denormals on intel celeron

shift8 shift8 at digitrash.com
Tue Aug 23 20:59:38 CEST 2005


On Tue, 2005-08-23 at 09:31 -0700, Miller Puckette wrote:
> Hmm, weren't PD_BADFLOAT and PD_BIGORSMALL defined already on your system? 
> It's "idfef __i386__" which I assumed would be turned on for Celerons.  What
> compiler are you using???

gcc (GCC) 3.4.3   sorry - my c is a bit rusty (read: non-existant).  i
didn't know if it was being defined or not, so i added it to the
makefile. 

> It's PD_BIGORSMALL that gets tested everywhere these days.  But if you found
> a way to make denormals despite all the PD_BIGORSMALL fixes, I'd like to
> know where they're sneaking in.

so would i...


> I don't remember offhand if celerons have sse2 or not, and don't know if the
> -mfpmath=sse -msse flags work outside linux, but will at least try those
> on my system...

they do have sse2.

> cheers
> Miller

thanks!

> On Tue, Aug 23, 2005 at 09:29:56AM +0200, Tim Blechmann wrote:
> > > hi all - i'm having really bad denormal problems on a intel celeron
> > > 2.4ghz.  pd is from cvs aug 8th.  looked around and found PD_BADFLOAT
> > > and PD_BIGORSMALL.  on a lark i defined them and rebuilt, and even
> > > though it solved it for a while, but no - i'm still having the same
> > > problem.  looked around some more and found those only appear in
> > > m_pd.h... anyone know what i can do to fix this?  
> > 1. compile with -mfpmath=sse -msse (the sse unit is much better handling
> > denormals)
> > 
> > 2. use devel_0_39. it includes code to switch on hardware DAZ (Denormals
> > Are Zero) on cpus supporting sse2
> > 
> > hope this helps ... t
> > 
> > -- 
> > mailto:TimBlechmann at gmx.de    ICQ: 96771783
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> > 
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