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From: marty@puppsr.princeton.edu
Newsgroups: comp.sys.sun
Subject: Re: f77 floating point exceptions opn SS1 4.0.3
Keywords: Software
Message-ID: <1990Sep18.203409.7906@rice.edu>
Date: 18 Sep 90 23:49:20 GMT
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X-Sun-Spots-Digest: Volume 9, Issue 315, message 1
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In article <1990Aug16.000008.7986@rice.edu>, preston@ra.src.umd.edu
(James Preston) writes:
|> We are using f77 on Sparcstations (OS4.0.3) and are quite often
getting
|> the message:
|> 	Floating point errors ocurred...
|> 	Inexact; Underflow;

You have to look over your code carefully to find out whether you have a
real problem.  The compiler usually does the right thing (like exp(large
neg.  number) becomes zero but will raise flags).  If the code is
thoroughly debugged :-) it can be ignored.  Try inserting the line

	idummy = ieee_handler('set','invalid',SIGFPE_ABORT)

near the top of the program to make it crash where the error is occurring,
and use dbx to examine the pieces...  Good luck.

Marty Ryba
Princeton University
marty@pulsar.princeton.edu