commit 512b9a692ffec896ec803768afe8ccc04931fcf0
author Keith Rothman <537074+litghost@users.noreply.github.com> Tue Oct 08 10:58:05 2019 -0700
committer kmurray <kmurray@users.noreply.github.com> Wed Oct 09 17:28:41 2019 -0400
tree d15eadc63094080d904bf9b86cd1abeaf82ccd7e
parent 4dac4a947c9d7400ea4cef4bad5376301478d014

Add debug logging if there is a non-finite value from the lookahead.

Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>

vpr/src/route/route_timing.cpp

diff --git a/vpr/src/route/route_timing.cpp b/vpr/src/route/route_timing.cpp
index 25b4d58..5e2f358 100644
--- a/vpr/src/route/route_timing.cpp
+++ b/vpr/src/route/route_timing.cpp
@@ -2033,6 +2033,11 @@
 
     //Update total cost
     float expected_cost = router_lookahead.get_expected_cost(to_node, target_node, cost_params, to->R_upstream);
+    VTR_LOGV_DEBUG(f_router_debug && !std::isfinite(expected_cost),
+                   "        Lookahead from %s (%s) to %s (%s) is non-finite, expected_cost = %f, to->R_upstream = %f\n",
+                   rr_node_arch_name(to_node).c_str(), describe_rr_node(to_node).c_str(),
+                   rr_node_arch_name(target_node).c_str(), describe_rr_node(target_node).c_str(),
+                   expected_cost, to->R_upstream);
     total_cost = to->backward_path_cost + cost_params.astar_fac * expected_cost;
 
     to->cost = total_cost;