#define IMPOSSIBLE -1		/*indicator of an array location that    */
/*should never be accessed */

void compute_delay_lookup_tables(struct s_router_opts router_opts,
		struct s_det_routing_arch det_routing_arch, t_segment_inf * segment_inf,
		t_timing_inf timing_inf, t_chan_width_dist chan_width_dist, INP t_direct_inf *directs, 
		INP int num_directs);
void free_place_lookup_structs(void);

extern float **delta_io_to_clb;
extern float **delta_clb_to_clb;
extern float **delta_clb_to_io;
extern float **delta_io_to_io;