MMX, 3DNOW!, SSE and SSE2 supprot

[oficjalne100]

I found post on this forum that Qt compiled with MinGW does not support MMX, 3DNOW!, SSE and SSE2 in the past. This was clearly visible when run configure.exe (eg SSE...... no). But now configure.exe by default displays support for MMX, 3DNOW!, SSE and SSE2. Is that mean MMX, 3DNOW!, SSE and SSE2 works now in Qt compiled with MinGW similiar to Qt compiled with Visual C++?

Another question:
When I have not SSE2 in my processor is that mean Qt programs will crash when I use Qt SDK for Windows?
(which by default is compiled with Visual C++ and SSE2 support).
Till now I do not observe that behaviour. But it is just my luck or maybe is there some protection against use SSE2 when processor does not support it?


thanks
Szyk