Rounding errors using doubles?

[Dima Volodin]

Sam Lantinga wrote:

> I have to thank everyone here on this list for your responsiveness.
> The problem was caused by unexpected values in code using doubles
> that was ported from Windows.  Apparently, by default, Windows uses
> 53 bits of precision for it's double operations.  Linux uses 64 bits.
>
> Since the code relies on the exact behavior of doubles quite extensively,
> we are setting the precision of the FPU to 53 bits using the fldcw
> instruction. :)
>
> BTW, does anyone know what precision is used on the PPC and Alpha
> architectures?

Man, I'm telling you - your code is _broken_. It's just sheer luck you see it
working at all.

>         -Sam Lantinga                           (slouken@devolution.com)

Dima