Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!zodiac!dmc
From: dmc@zodiac.ADS.COM (David Chelberg)
Newsgroups: comp.lang.lisp
Subject: allegro CL 1.2.2 floating point
Summary: Divide by zero crashes lisp
Message-ID: <7224@zodiac.UUCP>
Date: 17 Mar 89 00:19:36 GMT
Sender: news@zodiac.UUCP
Reply-To: dmc@ads.com (David Chelberg)
Organization: Advanced Decision Systems, Mt. View, CA (415) 960-7300
Lines: 13


I have version 1.2.2 of Allegro CL for the macIIx. Whenever there is a floating
divide by zero I get a miscellaneous exception error and the machine crashes.
This doesn't happen on my mac plus running version 1.2.1. I suspect
the coprocessor is generating an exception which lisp isn't catching.
Does anyone have a fix for this? I have already tried email to
allegro@entity but received no response. I have written a new divide which
tests explicitly for zero, but it is 2.6 times slower. Perhaps someone
has a way to trap the exception???

Thanks,

-- Dave Chelberg (dmc@ads.com)