/* reroute the edges from the proj to the argument */
exchange(pairs[i].out_node, pairs[i].in_node);
//edges_reroute(pairs[i].out_node, pairs[i].in_node, env->birg->irg);
/* reroute the edges from the proj to the argument */
exchange(pairs[i].out_node, pairs[i].in_node);
//edges_reroute(pairs[i].out_node, pairs[i].in_node, env->birg->irg);