Re: Floating-point differences between ARM processors
Re: Floating-point differences between ARM processors
- Subject: Re: Floating-point differences between ARM processors
- From: Jean Suisse <email@hidden>
- Date: Tue, 08 Jan 2013 02:43:27 +0100
On 8 janv. 2013, at 00:24, Rick Mann wrote:
>
> On Jan 7, 2013, at 11:22 , Greg Parker wrote:
>
>> Note also that physics simulations will always need to be careful with the error inherent to finite precision floating-point arithmetic. IEEE specification of exact results for every operation wouldn't solve that.
This is a key point that shouldn't be forgotten.
> We don't care so much about correct results as we do repeatable results. When you write a multiplayer Game Center game, you have to pass around initial conditions and expect the simulation to run deterministically across platforms.
That wasn't clear (at least for me) in your original message. It is also a key point. In that case, you indeed don't need accuracy. Why not go for one of Vincent Habchi's solutions then ? That could give you more control over the results.
Jean
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