On OpenVMS VAX systems, the Extended Multiply and Integerize
    routine (H-Floating-Point Values) allows higher-level language
    users to perform accurate range reduction of H-floating
    arguments.
    This routine is not available to native OpenVMS Alpha programs
    but is available to translated VAX images.
    Format
      LIB$EMODH  floating-point-multiplier ,multiplier-extension
                 ,floating-point-multiplicand ,integer-portion
                 ,fractional-portion
1 – Returns
    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value
2 – Arguments
 floating-point-multiplier
    OpenVMS usage:floating_point
    type:         H_floating
    access:       read only
    mechanism:    by reference
    The multiplier. The floating-point-multiplier argument is an
    H-floating number.
 multiplier-extension
    OpenVMS usage:word_unsigned
    type:         word (unsigned)
    access:       read only
    mechanism:    by reference
    The left-justified multiplier-extension bits. The multiplier-
    extension argument is an unsigned word.
 floating-point-multiplicand
    OpenVMS usage:floating_point
    type:         H_floating
    access:       read only
    mechanism:    by reference
    The multiplicand. The floating-point-multiplicand argument is an
    H-floating number.
 integer-portion
    OpenVMS usage:longword_signed
    type:         longword integer (signed)
    access:       write only
    mechanism:    by reference
    The integer portion of the result. The integer-portion argument
    is the address of a signed longword integer containing the
    integer portion of the result.
 fractional-portion
    OpenVMS usage:floating_point
    type:         H_floating
    access:       write only
    mechanism:    by reference
    The fractional portion of the result. The fractional-portion
    argument is an H-floating number.