In SVN there is a new function may_share_memory(a,b) which will return True if the memory foot-print of the two arrays over-lap.

...

...

may_share_memory(a, flipud(a))

True

This is based on another utility function byte_bounds that returns the byte-boundaries of any object exporting the Python side of the array interface.

Perhaps these utilities will help (I know they can be used to make the who function a bit more intelligent about how many bytes are being used).

-Travis