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From: migieger@luva.lb.bawue.de (Michael Giegerich)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: FreeBSD 221 math problem, help
Date: 31 May 1997 16:26:50 +0200
Organization: BaWue-Net Ludwigsburg
Lines: 34
Message-ID: <5mpcfa$278@luva.lb.bawue.de>
References: <01bc6afa$0dd23720$3976c9ce@amuancw110> <338E6020.5045@OntheNet.com.au>
NNTP-Posting-Host: luva.lb.bawue.de
Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:41970
In article <338E6020.5045@OntheNet.com.au>,
Tony Griffiths <tonyg@OntheNet.com.au> wrote:
>Tim Brown wrote:
>>
>> I am getting a math error (FPE) in some pretty old code. The code works
...
>You're not using a Pentium with the FP bug by any chance?
>
>Is there a program on the net for testing if you have a "dud" Pentium?
Here's a C source I picked from the net some
time ago (sorry, don't know who to credit):
/*
Here is a simple test program that will reproduce the bug, if present;
if this prints "256.000000" as result, your system is affected; on a 486,
this prints "0.000000".
*/
#include <stdio.h>
int main()
{
double x,y,z;
x = 4195835.0;
y = 3145727.0;
z = x - (x / y) * y;
printf("%f\n",z);
return 0;
}
--
Michael Giegerich, E-Mail: migieger@luva.lb.bawue.de, Voice: +49 7144 39337