RE: aptitude on alpha (again, sigh)
98 times out of 100, Floating Point Exception errors on Alpha are caused
by either an uninitialized floating point variable (that happens to have
random garbage in it) being used in a calculation, or a floating point
"divide by zero" operation. Those are plain and simple program bugs and
using the IEEE compiler switches just masks the real problem.
Jeff Donsbach
> -----Original Message-----
> From: Mike Touloumtzis [mailto:miket@bluemug.com]
> Sent: Thursday, November 08, 2001 12:09 AM
> To: Daniel Burrows; Christopher C. Chimelis;
> debian-alpha@lists.debian.org
> Subject: Re: aptitude on alpha (again, sigh)
>
>
> On Thu, Nov 01, 2001 at 04:03:29PM -0500, Daniel Burrows wrote:
> > On Thu, Nov 01, 2001 at 03:43:51PM -0500, "Christopher C.
> Chimelis" <chris@debian.org> was heard to say:
> > >
> > > It's an Alpha thing. I started looking into this bug a
> few weeks ago, but
> > > got busy with other things. One thing I do know that
> needs to be done is
> > > adding "-mieee" to CFLAGS and CXXFLAGS on Alpha. It
> would probably be
> >
> > Why does this fix the problem? (ie, is this just working
> around a bug
> > in the code?) The documentation says it has something to do with
> > floating-point comparisons being "inexact". Specifically,
> it mentions
> > handling NaN and +-Inf correctly. This seems to be
> indicating that I
> > have a divide-by-zero somewhere!
>
> In all three cases in which I tracked down and fixed one of
> these bugs,
> the problem was use of an uninitialized floating-point value.
> So that's
> another possibility.
>
> miket
>
>
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