VMS Help MACRO, VAX MACRO Assembler, Directives, .D FLOATING (.DOUBLE)  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Evaluates the  specified  floating-point  constants  and  stores
    the results  in  the  object module.  Generates 64-bit,
    double-precision, floating-point data (1 bit of sign, 8 bits of
    exponent, and  55  bits of fraction).

      .D_FLOATING literal-list
      .DOUBLE literal-list

    literal-list

    A list of floating-point constants, which cannot contain any unary
    or binary operators except unary plus or unary minus.

    Double-precision floating-point numbers are always rounded.  They
    are not  affected by .ENABLE TRUNCATION.  The floating-point
    constants in the literal list must not be preceded by the
    floating-point  operator (^F).