Floating Point Math class problem on Tru64 Alpha v 5.1

[Andrew Haley <aph at cambridge dot redhat dot com>]

ake@purdue.edu writes:
 > >Category:       libgcj
 > >Synopsis:       Floating Point Math class problem on Tru64 Alpha v 5.1
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Originator:     Antonio Ake
 > >Release:        3.0.2 prerelease
 > >Environment:
 > TRu64 Unix v 5.1
 > >Description:
 > his is the part of the code executing:
 >    public static double d1f (double arg) {
 >       double y,x;
 >      
 >       	  System.out.print("Argument arg is " + arg + " ");
 > 	  y= Math.exp(arg);
 > 	  System.out.print("Argument y is " + y + " ");
 > 	  x=Math.pow((y+1.0),2.0);
 > 	  System.out.print("Argument x is " + x + "\n");
 > 	  return ( (2.0 * y)/x );
 > }
 > The problem is when x is infinity.
 > Argument arg is 378.0812928461101 
 > Var y is 1.5798621479294393E164 
 > Var  x is Infinity
 > Floating point exception (core dumped)
 > I tested on Linux x/86 and it is working, the problem is on Tru64 Unix

Fascianting.  It looks as though floating-point exceptions trigger a
signal on this system.  I've never come across a system which does
this before.

Can you please write a trivial C program that does the same thing and
see if it also results in a Floating point exception?

Thanks,
Andrew.