g++ optimization issue??

[Lars Segerlund]

 Is not what ?

 I don't understand what you are trying to say. Please be a bit more precise.

 / Lars Segerlund.


On Fri, 17 Dec 2004 13:36:19 +0100
ColinLaney <claney@online.de> wrote:

> I am aware of fp issues. I just don't understand why the compiler
> generates code that is not.
> 
> On Fri, 2004-12-17 at 12:27 +0000, Dave Korn wrote:
> > > -----Original Message-----
> > > From: gcc-owner On Behalf Of ColinLaney
> > > Sent: 17 December 2004 12:13
> > 
> > > I'm sorry if this has come up before and/or is well known or 
> > > obvious. If so I would appreciated to be pointed in the right 
> > > direction.
> > > 
> > > When compiled with "-O6" 
> > 
> >   You do understand that there aren't any optimisation levels > 3, don't you?
> > 
> > > the program below produces the following output:
> > > 203744051  0.440158
> > > 203744051  0.633306
> > > 203744051  0.633306
> > > 203744051  0.440158
> > > 
> > > 
> > > I've added some comments on what I think went wrong. 
> > 
> >   Have you read 'What every computer scientist should know about floating
> > point'?
> > 
> > http://tinyurl.com/4sw7n
> > 
> > 
> >     cheers, 
> >       DaveK
>