Re: [GD-General] ieee754 -0.0f?

[Andras B. <and...@gm...>]

Well, I've thought about that too, I'm running in debug mode, no  
optimizations and using improved floating point consistency (/Op). Still,  
-0.0f gives me 0x00000000..

On Wed, 01 Feb 2006 11:15:54 -0700, Ash Henstock <hen...@gm...>  
wrote:

> Hi Andras,
>
> I suspect you've got "Fast" floating point model selected in VS project
> options (check in C++->Code Generation I think).
> Running your code here with Strict or Precise gives:
> -0.000000 = 80000000
> but it falls down how you describe (00000000), with Fast selected.
>
> (Turion 64 MSVC8 here).
>
> Cheers.
>
> -- Ash.
>
> On 2/1/06, Andras Balogh <and...@gm...> wrote:
>>
>> > They are different, on an IEEE compliant system.
>>
>> Yeah, I know, that's why I'm surprised! :)
>>
>> > -0.0 = 0xbf800000
>> > +0.0 = 0x3f800000
>>
>> These are -1.0f and +1.0f, but yeah, I've got the point.
>>
>> > You didn't mention the language or how you're generating those values.
>> > Using VC6 on a Pentium-M by setting global floats I get the correct
>> > and expected values.
>>
>> VS7.1 running on Athlon64, see source in previous post.
>>
>>
>> thanks,
>>
>>
>>
>> Andras