## ror - rotate right

    dest = dest @>> source      ; made up notation for rotate

The ror instruction rotates the destination right the number of times indicated by the source. Rotating right by is like shifting right, but the bits shifted out the right end are entered onto the left end. The destination can be a 64, 32, 16 or 8 bit register or memory location. The source can be either an immediate value or the cl register.

There is also a rcr instruction which adds the carry flag as an additional bit in the rotation.

Here is an example of a rotate right:

         1010010010101011
                   @>>  3
         ----------------
         0010010101011101

Some examples of using ror:

            ror     rax, 15         ; rotate rax 15 bits
            ror     eax, 10         ; rotate eax 10 bits
                                    ; fills upper half of rax with 0
            ror     dx, cl          ; rotate dx the cl bits right
                                    ; leaves the rest of rdx alone
            ror     [x], 2          ; rotate 32 bit variable x 2 bits

### flags: OF CF

CF contains the last bit shifted out. OF is changed only for single bit shifts.