[GD-Windows] Strange float bug?

[Brett B. <res...@ga...>]

We have been tracking down the wierdest bug for several days. Our code =
was crashing randomly and then we finally found a repeatable case where =
an assert on an identity matrix when we check the orthonormalness of it =
and we chanced upon a line of code that returned -nan that was simply x =
=3D (1.0f - (a + b)).  Anyway, I suddenly remembered a GDC talk about =
Windows denormals, did a quick google and pasted a _controlfp( =
_CW_DEFAULT, 0xfffff ) into our code and presto it now works.

We make games for PS2 and GCN and are Windows amateurs, but I hate the =
idea of not understanding what went wrong and how to properly handle =
this.  Has anybody ever encountered something like this before?

Brett