Minimal Branch Predictor

class local_update : public branch_update
{
public:
        unsigned int counter;
};

class local_predictor : public branch_predictor
{
public:
        local_update u;
        branch_info binfo;


        local_predictor (void)
        {

        }

        branch_update *predict (branch_info & b)
        {
            binfo = b;
            if (b.br_flags & BR_CONDITIONAL)
            {
                u.direction_prediction ((u.counter) >> 1);
            }
            else u.direction_prediction(true);
            u.target_prediction (0);
            return &u;
        }

        void update (branch_update *u, bool taken, unsigned int target)
        {

            unsigned int *c = &((local_update*)u)->counter;
            if (binfo.br_flags & BR_CONDITIONAL)
            {

                if (taken)
                {
                    if (*c < 3)
                        (*c)++;
                }
                else
                {
                    if (*c > 0)
                        (*c)--;
                }
            }
        }

};