VMS Help MACRO, VAX MACRO Assembler, Vector Instructions, VADD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

      Vector Floating Add

    Format:

      vector + vector:

       { VVADDF }
       { VVADDD }   [/U[0|1]]    Va, Vb, Vc
       { VVADDG }
       {        }

      scalar + vector:

       { VSADDF }
       { VSADDD }   [/U[0|1]]    scalar, Vb, Vc
       { VSADDG }
       {        }

    Architecture

    Format
    vector + vector:

       opcode   cntrl.rw

    scalar + vector (F_floating):

       opcode   cntrl.rw, addend.rl

    scalar + vector (D_ and G_floating):

       opcode   cntrl.rw, addend.rq
    opcodes

    84FD    VVADDF    Vector Vector Add F_Floating

    85FD    VSADDF    Vector Scalar Add F_Floating

    86FD    VVADDD    Vector Vector Add D_Floating

    87FD    VSADDD    Vector Scalar Add D_Floating

    82FD    VVADDG    Vector Vector Add G_Floating

    83FD    VSADDG    Vector Scalar Add G_Floating

    vector_control_word

             1 1 1 1 1
             5 4 3 2 1     8 7     4 3     0
            +-+-+-+-+-------+-------+-------+
            |M|M|E| |  Va   |       |       |
            |O|T|X|0|  or   |  Vb   |  Vc   |
            |E|F|C| |  0    |       |       |
            +-+-+-+-+-------+-------+-------+
    exceptions

       floating overflow
       floating reserved operand
       floating underflow

    operation
      FOR i <- 0 TO VLR-1
        IF {{MOE EQL 0} OR {{MOE EQL 1} AND {VMR<i> EQL

          BEGIN
            IF VVADDF THEN
               Vc[i]<31:0> <- Va[i]<31:0> + Vb[i]<31:0>
            IF VSADDF THEN
               Vc[i]<31:0> <- addend + Vb[i]<31:0>

            IF VVADDD OR VVADDG THEN
               Vc[i] <- Va[i] + Vb[i]
            IF VSADDD OR VSADDG THEN
               Vc[i] <- addend + Vb[i]
          END