Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!cs.utexas.edu!asuvax!noao!arizona!naucse!jdc
From: jdc@naucse.UUCP (John Campbell)
Newsgroups: comp.lang.c
Subject: Re: SIGFPE signal problem
Message-ID: <1952@naucse.UUCP>
Date: 19 Mar 90 16:15:31 GMT
References: <5450@rouge.usl.edu>
Distribution: usa
Organization: Northern Arizona University, Flagstaff, AZ
Lines: 21

From article <5450@rouge.usl.edu>, by pcb@gator.cacs.usl.edu (Peter C. Bahrs):
: I am trying to detect overflow, 0 divide and, although it may seem
: unlikely, underflow.  Doesn't SIGFPE detect this?  If so, why doesn't
: the following SMALL code work? 
: 
: Why and how in the heck can vendors not provide for underflow detection?
: I am working on SUN 3,4 and Val 11780.
: 
I have at least one example on my ATT3b1 of computing IEEE Inf and not
causing a SIGFPE until the next operation on this value.  My "solution"
was to do some special checking near the computation as well as arming
SIGFPE.  

I'd be interested in hearing a discussion here from others who know more
than I about how this can happen.  Like Peter, I wonder "...can vendors
not provide for " dependable SIGFPE?

-- 
	John Campbell               ...!arizona!naucse!jdc
                                    CAMPBELL@NAUVAX.bitnet
	unix?  Sure send me a dozen, all different colors.