cmul() returns the product of two complex numbers.

    cmul(a,b,c,d) is defined as (a + ib) * (c + id).

                           Entry-Point Names

    Generic
    Function   Data Type   OpenVMS        Tru64 UNIX
    Name       Required

    cmul       S_FLOAT     math$cmul_s    cmulf
               T_FLOAT     math$cmul_t    cmul
               X_FLOAT     math$cmul_x    cmull
               F_FLOAT     math$cmul_f
               G_FLOAT     math$cmul_g