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

 desc_addr

    The address of the descriptor to test.

 target

    The label to branch to if the descriptor is in 64-bit format.

 size=long|quad

    The size of the address pointing to the descriptor. The default
    value is size=long.
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