From owner-freebsd-hackers  Thu Dec 23  5:42: 4 1999
Delivered-To: freebsd-hackers@freebsd.org
Received: from axl.noc.iafrica.com (axl.noc.iafrica.com [196.31.1.175])
	by hub.freebsd.org (Postfix) with ESMTP id 0D7E414E0C
	for <hackers@freebsd.org>; Thu, 23 Dec 1999 05:42:00 -0800 (PST)
	(envelope-from sheldonh@axl.noc.iafrica.com)
Received: from sheldonh (helo=axl.noc.iafrica.com)
	by axl.noc.iafrica.com with local-esmtp (Exim 3.11 #1)
	id 1218Wn-000Dgq-00
	for hackers@FreeBSD.org; Thu, 23 Dec 1999 15:43:37 +0200
From: Sheldon Hearn <sheldonh@uunet.co.za>
To: hackers@FreeBSD.org
Subject: SIGFPE on arithmetic overflow
Date: Thu, 23 Dec 1999 15:43:37 +0200
Message-ID: <52627.945956617@axl.noc.iafrica.com>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG


Hi folks,

I'm looking for an explanation of a difference I've found between NetBSD
and FreeBSD in the handling of arithmetic overflow in typecasting.

The following code, compiled on a stock FreeBSD 4.0-CURRENT machine
cores on SIGFPE.  On a NetBSD 1.4.1 machine (gcc-2.91.60), the program
prints the value of INT_MAX.

	int
	main(void)
	{
		double	x;
		int	i;

		x = 1e19;
		i = (int)x;
		printf("%d\n", i);

		return 0;
	}

So can anyone explain the cause of this difference to me? :-)

Ciao,
Sheldon.


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message