/sys$common/syshlp/helplib.hlb RTL Routines, MTH$, MTH$xLOG2, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 floating-point-input-value

    OpenVMS usage:floating_point
    type:         F_floating, D_floating, G_floating
    access:       read only
    mechanism:    by reference

    The input value. The floating-point-input-value argument is the
    address of a floating-point number that is this input value. For
    MTH$ALOG2, floating-point-input-value specifies an F-floating
    number. For MTH$DLOG2, floating-point-input-value specifies a
    D-floating number. For MTH$GLOG2, floating-point-input-value
    specifies a G-floating number.