specify the domain of latency overrun vars based on the noc dimensions

Author: soheilshahrouz

vpr/src/base/vpr_types.h

@@ -1504,7 +1504,7 @@ struct t_noc_opts {
     double noc_congestion_weighting;                  ///<controls the significance of the link congestions relative to the other NoC placement costs range:[0-inf)
     double noc_centroid_weight;                       ///<controls how much the centroid location is adjusted towards NoC routers in NoC-biased centroid move:[0, 1]
     int noc_swap_percentage;                          ///<controls the number of NoC router block swap attempts relative to the total number of swaps attempted by the placer range:[0-100]
-    int noc_sat_routing_bandwidth_resolution;         ///<the resolution by which traffic flow and link bandwidths are converted to integers in SAT routing algorithm
+    int noc_sat_routing_bandwidth_resolution;         ///<if this number is N, the SAT formulation models link utilization in increments of 1/N
     int noc_sat_routing_latency_overrun_weighting;    ///<controls the importance of reducing traffic flow latency overrun in SAT routing [0-inf)
     int noc_sat_routing_congestion_weighting;         ///<controls the importance of reducing the number of congested NoC links in SAT routing [0-inf)
     int noc_sat_routing_num_workers;                  ///<the number of parallel worker threads that the SAT solver can use to explore the solution space

vpr/src/noc/odd_even_routing.cpp

@@ -34,7 +34,10 @@ const std::vector<TurnModelRouting::Direction>& OddEvenRouting::get_legal_direct
     const auto curr_router_pos = curr_router.get_router_physical_location();
     const auto dst_router_pos = dst_router.get_router_physical_location();
 
-    // get the compressed location for source, current, and destination NoC routers
+    /* get the compressed location for source, current, and destination NoC routers
+     * Odd-even routing algorithm restricts turn based on whether the current NoC router
+     * in an odd or even NoC column. This information can be extracted from the NoC compressed grid.
+     */
     auto compressed_src_loc = get_compressed_loc_approx(compressed_noc_grid, t_pl_loc{src_router_pos, 0}, num_layers)[src_router_pos.layer_num];
     auto compressed_curr_loc = get_compressed_loc_approx(compressed_noc_grid, t_pl_loc{curr_router_pos, 0}, num_layers)[curr_router_pos.layer_num];
     auto compressed_dst_loc = get_compressed_loc_approx(compressed_noc_grid, t_pl_loc{dst_router_pos, 0}, num_layers)[dst_router_pos.layer_num];