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

      Vector Floating Multiply

    Format:

      vector * vector:

       { VVMULF }
       { VVMULD }    [/U[0|1]]    Va, Vb, Vc
       { VVMULG }
       {        }

      scalar * vector:

       { VSMULF }
       { VSMULD }    [/U[0|1]]    scalar, Vb, Vc
       { VSMULG }
       {        }

    Architecture

    Format
    vector * vector:

       opcode   cntrl.rw

    scalar * vector (F_floating):

       opcode   cntrl.rw, mulr.rl

    scalar * vector (D_ and G_floating):

       opcode   cntrl.rw, mulr.rq
    opcodes

    A4FD    VVMULF    Vector Vector Multiply F_floating

    A5FD    VSMULF    Vector Scalar Multiply F_floating

    A6FD    VVMULD    Vector Vector Multiply F_floating

    A7FD    VSMULD    Vector Scalar Multiply D_floating

    A2FD    VVMULG    Vector Vector Multiply G_floating

    A3FD    VSMULG    Vector Scalar Multiply 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 MTF}}} THEN
          BEGIN
            IF VVMULF THEN
               Vc[i]<31:0> <- Va[i]<31:0> * Vb[i]<31:0>
            IF VSMULF THEN
               Vc[i]<31:0> <- mulr * Vb[i]<31:0>

            IF VVMULD OR VVMULG THEN
               Vc[i] <- Va[i] * Vb[i]
            IF VSMULD OR VSMULG THEN
               Vc[i] <- mulr * Vb[i]
          END