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MACRO, Macros for 64-Bit Addressing, $IS DESC64, Description
 *Conan The Librarian 

    $IS_DESC64 tests the fields that distinguish a 64-bit descriptor
    from a 32-bit descriptor. If it is in 64-bit form, a branch is
    taken to the specified target. The address to be tested is read
    as a longword, unless size=quad is specified.
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