CWDE - Convert Word to Extended Doubleword (386+)

        Usage:  CWDE
        Modifies flags: None

        Converts a signed word in AX to a signed doubleword in EAX by
        extending the sign bit of AX throughout EAX.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              -     -     3     3             1

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