how to detect OS architecture?

[Hugo Florentino]

On Wed, 18 Dec 2013 13:16:35 -0000, Regan Heath wrote:
> IsWow64Process returns (in the output parameter) if the 32 bit
> application  is running in WOW64.  WOW64 *only* exists on a 64 bit 
> OS.
> So, if true  this tells you you're on a 64 bit OS.  You don't need an
> additional call  to GetNativeSystemInfo at all.

Cool, thanks for clarifying.

BTW, how could I benchmark the performance of both solutions (lets say 
for a few thousand runs) to see if one is more efficient than the other?