Weird bits shifting behavior on win32

[tomaka]

This is a win32-only issue.

On windows 64 bits:
(8u * std::mem::size_of::<u32>()) returns 32
3u >> (8u * std::mem::size_of::<u32>()) returns 3
3u >> 32u returns 0

EDIT: IRC found the problem, uint is only 32 bits even on Windows 64 bits, which causes undefined behavior.
Sorry for wasting your time, closing.