RET/RETF - Return From Procedure

        Usage:  RET     nBytes
                RETF    nBytes
                RETN    nBytes
        Modifies flags: None

        Transfers control from a procedure back to the instruction address
        saved on the stack.  n bytes is an optional number of bytes to
        release.  Far returns pop the IP followed by the CS, while near
        returns pop only the IP register.

                                 Clocks                 Size
        Operands         808x  286    386   486         Bytes

        retn            16/20  11+m  10+m    5            1
        retn immed      20/24  11+m  10+m    5            3
        retf            26/34  15+m  18+m    13           1
        retf (PM, same priv.)   -    32+m    18           1
        retf (PM, lesser priv.) -      68    33           1
        retf immed      25/33  15+m  18+m    14           3
        retf immed (PM, same priv.)  32+m    17           1
        retf immed (PM, lesser priv.)  68    33           1


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