Rotating a bitmap 90 degrees

Question

I have a one 64-bit integer, which I need to rotate 90 degrees in 8 x 8 area (preferably with straight bit-manipulation). I cannot figure out any handy algorith

Answer 1

If you look at this as a 2 dimensional array then you have the solution no? Just make the rows the new columns. First row is the last column, 2nd is the one before last and so on.

Visually at least, it looks like your solution.