HLS code

#include <hls_stream.h>

void MatrixSplitter(int a [2][2], int b [2][2],
        hls::stream<int> &x, hls::stream<int> &y,
        hls::stream<int> &w, hls::stream<int> &z){
#pragma HLS INTERFACE s_axilite port=return
#pragma HLS INTERFACE s_axilite port=a
#pragma HLS INTERFACE s_axilite port=b
#pragma HLS INTERFACE axis register both port=x name=x
#pragma HLS INTERFACE axis register both port=y name=y
#pragma HLS INTERFACE axis register both port=w name=w
#pragma HLS INTERFACE axis register both port=z name=z

    //the first 2 integers sent on each stream represent the "position" of the vectors being mutiplied

    x.write(0);
    x.write(0);

    y.write(0);
    y.write(1);

    w.write(1);
    w.write(0);

    z.write(1);
    z.write(1);

    //then we send on each stream the i-th element of the row from the first matrix
    //followed by the i-th element of the ccolumn from the second matrix

    for (int i = 0; i<2; i++){

        x.write(a[0][i]);

        y.write(a[0][i]);

        w.write(a[1][i]);

        z.write(a[1][i]);


        x.write(b[i][0]);

        y.write(b[i][1]);

        w.write(b[i][0]);

        z.write(b[i][1]);
    }
}
void VectorMultiplier (hls::stream<int> &in, hls::stream<int> &out){
#pragma HLS INTERFACE ap_ctrl_none port=return
#pragma HLS INTERFACE axis register both port=in name=in
#pragma HLS INTERFACE axis register both port=out name=out


    //the first two integers (the "coordinates") are just passed on
    out.write(in.read());
    out.write(in.read());

    int res=0;
    for (int i = 0; i<2; i++){
        int part=in.read();
        part*=in.read();
        res += part;
    }
    out.write(res);
}

void consumeStream(hls::stream<int> &a, int out [2][2]){
    int row = a.read();
    int col = a.read();
    out [row][col]=a.read();
}


void MatrixJoiner(hls::stream<int> &x, hls::stream<int> &y,
        hls::stream<int> &w, hls::stream<int> &z, int out [2][2]){
#pragma HLS INTERFACE s_axilite port=return
#pragma HLS INTERFACE axis register both port=x name=x
#pragma HLS INTERFACE axis register both port=y name=y
#pragma HLS INTERFACE axis register both port=w name=w
#pragma HLS INTERFACE axis register both port=z name=z
#pragma HLS INTERFACE s_axilite port=out

    int tempOut[2][2]={
            {0, 0},
            {0, 0}
    };

    consumeStream(x, tempOut);
    consumeStream(y, tempOut);
    consumeStream(w, tempOut);
    consumeStream(z, tempOut);


    for (int i = 0; i<2; i++){
        for (int j = 0; j<2; j++){
            out[i][j]=tempOut[i][j];
        }
    }
}