Yeah, I had also tried that already, but doesn't really give a clue:
```sh
$ uname -a
CYGWIN_NT-6.1-WOW64 sw10 1.7.24(0.269/5/3) 2013-08-15 11:55 i686 Cygwin
```
AFAIK, the 64bit build of Cygwin was only introduced "recently".  When I originally installed Cygwin, I'm fairly sure that the differentiation did not exist yet.  `uname` appears to display the hardware aspects (64bit) only.