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Re: [glob2-devel] Nicowar and desync


From: Cyrille Dunant
Subject: Re: [glob2-devel] Nicowar and desync
Date: Tue, 18 Jul 2006 21:56:33 +0200
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>
> Yeah, Kai already emailed me with a grep. I, unfortently, am not at my
> house, and I can't work on glob2 for atleast three weeks while my
> family moves. Worse yet, me might have to get modem-internet in our
> next house. Anyway, all of these usages are independant casts, so in
> my case, atleast the same CPU will give the same results every time.

no. Not even with the same compiler. The bits at the end of the mantissa are 
_random_ they depend on the system state, the weather, and the bugs in your 
hardware, and the manufacturer's breakfeast when they were built.

Do _not_ _ever_ depend on doubles for bit perfect reproducibility. 

> I'll fix this as soon as I have time. Sorry everyone, my mistake.

CU

 -- CFD




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