Re: [GD-Consoles] PS2 floating point

[J. G. <jg-...@jg...>]

Hi Brett,

Out of interest what was the problem with your implementation?  I found
that -fshort-double stopped some of the problems I was having with one
issue when I tested some float stuff a while ago.  However, if the code
is the problem then this would not solve that.

JG

Research (GameBrains) wrote:
> Gareth,
> Found it! (moved to chapter 8 in 6th edition).  Thank you very much!
> Brett
> 
> ----- Original Message ----- 
> From: "Gareth White" <gw...@ra...>
> To: <res...@ga...>
> Cc: <gam...@li...>
> Sent: Thursday, February 27, 2003 2:49 PM
> Subject: Re: [GD-Consoles] PS2 floating point
> 
> 
>> There are indeed subtle differences between the PS2 and the IEEE implementation.
>> 
>> Try the 'EE Core User's Manual' (2nd Edition), Page 77, Chapter 4
>> 'Floating-Point Unit (FPU)', section 4.8 'IEEE 754 Compatability'
>> 
>> Cheers.
>> 
>> ---
>> Gareth White - Engine Programmer - Ratbag Pty Ltd
>> Level 8, 63 Pirie Street, Adelaide, SA, Australia, 5000
>> Ph: +61 8 8223 5830, Fax: +61 8 8223 5746, Mob: 0403 942668
>> http://www.ratbaggames.com/
>> 
>> ----- Original Message -----
>> From: "Research (GameBrains)" <res...@ga...>
>> To: <Gam...@li...>
>> Sent: Thursday, February 27, 2003 4:46 PM
>> Subject: [GD-Consoles] PS2 floating point
>> 
>> 
>> Hello,
>> Our physics engine is experiencing some odd behavior on the PS2.  We traced it
>> to our resting contact force calculation where sometimes it seems the result is
>> not quite right, but it works fine on other platforms.  I don't know if it's an
>> urban legend or what, but I have heard that the PS2 has some quirks with regard
>> to floating point numbers and so I thought I would just ask and see if this is
>> something I need to look at or not.  If so, what are the differences between the
>> PS2 IEEE implementation and is there a doc describing them?
>> Thanks,
>> Brett