vpr: place: set chanz normalization factor to the average number of inter-die connections per tile

amin1377 · amin1377 · commit 7ffc4a23b493 · 2024-04-08T19:51:58.000-04:00
diff --git a/vpr/src/place/place.cpp b/vpr/src/place/place.cpp
@@ -4161,8 +4161,11 @@ static void alloc_and_load_for_fast_vertical_cost_update (float place_cost_exp)
                                     }
                                 }
                             }
+                            int num_seen_tiles = (x_high - x_low + 1) * (y_high - y_low + 1);
+                            float avg_num_seen_inter_die_conn = static_cast<float>(num_inter_die_conn) / num_seen_tiles;
                             chanz_place_cost_fac[layer_high_num][x_high][y_high][layer_low_num][x_low][y_low] =
-                                (avg_num_inter_die_conn_per_tile  / num_inter_die_conn);
+                                (layer_high_num - layer_low_num + 1)
+                                / (avg_num_seen_inter_die_conn);
 
                             chanz_place_cost_fac[layer_high_num][x_high][y_high][layer_low_num][x_low][y_low] = pow(
                                 (double)chanz_place_cost_fac[layer_high_num][x_high][y_high][layer_low_num][x_low][y_low],

Original file line number	Diff line number	Diff line change
`@@ -4161,8 +4161,11 @@ static void alloc_and_load_for_fast_vertical_cost_update (float place_cost_exp)`
`4161`	`4161`	`}`
`4162`	`4162`	`}`
`4163`	`4163`	`}`
	`4164`	`+ int num_seen_tiles = (x_high - x_low + 1) * (y_high - y_low + 1);`
	`4165`	`+ float avg_num_seen_inter_die_conn = static_cast<float>(num_inter_die_conn) / num_seen_tiles;`
`4164`	`4166`	`chanz_place_cost_fac[layer_high_num][x_high][y_high][layer_low_num][x_low][y_low] =`
`4165`		`- (avg_num_inter_die_conn_per_tile / num_inter_die_conn);`
	`4167`	`+ (layer_high_num - layer_low_num + 1)`
	`4168`	`+ / (avg_num_seen_inter_die_conn);`
`4166`	`4169`
`4167`	`4170`	`chanz_place_cost_fac[layer_high_num][x_high][y_high][layer_low_num][x_low][y_low] = pow(`
`4168`	`4171`	`(double)chanz_place_cost_fac[layer_high_num][x_high][y_high][layer_low_num][x_low][y_low],`