Incompatible battle replays across OSes

[talos]

Originally posted by Johan K:
The battles use sinus (sinf()) calculations and those might just be bad if those calculations should be significantly differnt on different machines. Definitely worth some thought...

If you are using gcc, the trig functions should all be implemented to the IEEE standard, which is to say that they should produce the same results across platforms.

This is not true if you use other C compilers, or if you use -ffast-math with gcc, as this allows the compiler to use the hardware trig functions, which in may cases (intel for one) do _not_ quite meet the ieee spec. Of course --ffast-math speeds gcc up quite a bit, as it avoids software Versions of trig functions (maybe sqrt as well?).

Of course, such differences should be tiny, so they should only affect actual results with miniscule probability (like one in a few hundred thousand).