VMS Help MACRO, /MIGRATION, Macros for 64-Bit Addressing, $IS 32BITS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Checks the sign extension of the low 32 bits of a 64-bit value
    and directs the program flow based on the outcome of the check.

    Format

      $IS_32BITS  quad_arg, leq_32bits, gtr_32bits, temp_reg=22

  Additional Information (explode) :

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