[PD] denormals on intel celeron

Miller Puckette mpuckett at man104-1.ucsd.edu
Tue Aug 23 18:31:09 CEST 2005

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???

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.

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...


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
> -- 
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