polynomial-argument
    OpenVMS usage:floating_point
    type:         D_floating
    access:       read only
    mechanism:    by reference
    The address of a D-floating number that is the argument for the
    polynomial.
 degree
    OpenVMS usage:word_signed
    type:         word integer (signed)
    access:       read only
    mechanism:    by reference
    The address of a signed word integer that is the highest-numbered
    nonzero coefficient to participate in the evaluation.
    If the degree is 0, the result equals C[0]. The range of the
    degree is 0 to 31.
 coefficient
    OpenVMS usage:floating_point
    type:         D_floating
    access:       read only
    mechanism:    by reference, array reference
    The address of an array of D-floating coefficients. The
    coefficient of the highest-order term of the polynomial is the
    lowest-addressed element in the array.
 floating-point-result
    OpenVMS usage:floating_point
    type:         D_floating
    access:       write only
    mechanism:    by reference
    The address of a floating-point number that is the result of
    the calculation. LIB$POLYD writes the address of floating-point-
    result into a D-floating number.
    Intermediate multiplications are carried out using extended
    floating-point fractions (63 bits for POLYD).