Fix GCC 5/6 warning.

Signed-off-by: Keith Rothman <[email protected]>

Author: litghost

vpr/src/route/route_common.cpp

@@ -468,7 +468,7 @@ void pathfinder_update_cost(float pres_fac, float acc_fac) {
 }
 
 void init_heap(const DeviceGrid& grid) {
-    size_t target_heap_size = (grid.width() - 1) * (grid.height() - 1);
+    ssize_t target_heap_size = (grid.width() - 1) * (grid.height() - 1);
     if (heap == nullptr || heap_size < target_heap_size) {
         if (heap != nullptr) {
             vtr::free(heap + 1);

vpr/src/route/rr_graph_storage.cpp

@@ -414,7 +414,7 @@ size_t t_rr_graph_storage::count_rr_switches(
             }
 
             auto fanin = arch_switch_counts[iswitch];
-            VTR_ASSERT_SAFE(iswitch < (ssize_t)num_arch_switches);
+            VTR_ASSERT_SAFE(iswitch < num_arch_switches);
 
             if (arch_switch_inf[iswitch].fixed_Tdel()) {
                 //If delay is independent of fanin drop the unique fanin info