Floating Point Underflow

[Ray Nachlinger]

On Fri, 26 Sep 2008, Tobias Schlüter wrote:

> Ray Nachlinger wrote:
> > On Fri, 26 Sep 2008, Steve Kargl wrote:
> > 
> > > On Fri, Sep 26, 2008 at 10:21:27AM -0500, Ray Nachlinger wrote:
> > > > On Fri, 26 Sep 2008, Steve Kargl wrote:
> > > >
> > > > > On Fri, Sep 26, 2008 at 09:43:15AM -0500, Ray Nachlinger wrote:
> > > > > > Is there a gfortran compiler option that will
> > > > > > prevent a fatal "Floating Point Underflow" error
> > > > > > message on 64bit Windows. This problem does not
> > > > > > occur on 32bit systems.
> > > > > >
> > > > > Is this a compile time or runtime problem?
> > > >   Only runtime. Have big program that works nicely on
> > > >   Solaris, 32, 64 bit Linux, 32bit OS X, and 32 bit
> > > >   Windows (mingw). Received this error report from
> > > >   a user on 64bit Windows. Traceback from place
> > > >   what an underflow should be expected.
> > > Underflow should never be a fatal error.   Is the error
> > > message a gfortran error message or an OS error message?
> > > It appears that you need to contact the OS vendor.
> > 
> >   I agree it never should be but have had it before
> >   (first sparcs required -abrupt_underflow not to
> >   abort). This is definitely a WINDOWS message, am not looking forward to
> >   contacting Microsoft.
> 
> Chapter 11 in Metcalf should be able to solve your user's problem, see 
> http://books.google.de/books?id=iLj_xAmxscgC&pg=PA219&lpg=PA219&dq=ieee+floating+point+exception+fortran&source=web&ots=8CKY_UazsA&sig=Qw2iCgcfnoeVZwnawHyFjbt2ozs&hl=en&sa=X&oi=book_result&resnum=9&ct=result#PPA219,M1
> 

  Thanks, was hoping for a compiler option but this will
  work nicely.

  Cheers,

  Ray