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[core] fixed the bug where there is only 1 routing trace for a net which should be ignored (due to treated as global). This net should not be ignored unless there are >1 routing traces on the top-level pb. Then we can merge one.

This commit is contained in:
tangxifan 2024-05-31 17:57:36 -07:00
parent 212abecc27
commit f9cd01636d
1 changed files with 28 additions and 1 deletions
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29
openfpga/src/repack/repack.cpp
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@ -304,6 +304,33 @@ static std::vector<int> find_pb_route_by_atom_net(
return pb_route_indices;
}
/***************************************************************************************
* This function will find the actual routing traces of the demanded net
* There is a specific search space applied when searching the routing traces:
* - ONLY applicable to the pb_pin of top-level pb_graph_node
***************************************************************************************/
static std::vector<int> find_pb_routes_by_atom_net_among_top_pb_pins(
const t_pb* pb, const AtomNetId& atom_net_id) {
std::vector<int> pb_route_indices;
std::vector<int> candidate_pool;
for (int pin = 0; pin < pb->pb_graph_node->total_pb_pins; ++pin) {
/* Bypass unused pins */
if ((0 == pb->pb_route.count(pin)) ||
(AtomNetId::INVALID() == pb->pb_route.at(pin).atom_net_id)) {
continue;
}
/* Get the driver pb pin id, it must be valid */
if (atom_net_id != pb->pb_route.at(pin).atom_net_id) {
continue;
}
if (pb->pb_route.at(pin).pb_graph_pin->parent_node->is_root()) {
candidate_pool.push_back(pin);
}
}
return candidate_pool;
}
/***************************************************************************************
* This function will find the actual routing traces of the demanded net
* There is a specific search space applied when searching the routing traces:
@ -584,7 +611,6 @@ static void add_lb_router_nets(
std::string(lb_type->pb_type->name), curr_pin))) {
/* Find the net mapped to this pin in clustering results*/
AtomNetId atom_net_id = pb_pin_mapped_nets[source_pb_pin];
std::vector<int> pb_route_indices =
find_pb_route_by_atom_net(pb, source_pb_pin, atom_net_id);
VTR_ASSERT(1 == pb_route_indices.size());
@ -641,6 +667,7 @@ static void add_lb_router_nets(
BasicPort curr_pin(std::string(source_pb_pin->port->name),
source_pb_pin->pin_number, source_pb_pin->pin_number);
if ((ignored_atom_nets[atom_net_id]) &&
(find_pb_routes_by_atom_net_among_top_pb_pins(pb, atom_net_id).size() > 1) &&
(options.is_pin_ignore_global_nets(std::string(lb_type->pb_type->name),
curr_pin))) {
VTR_LOGV(verbose, "Skip net '%s' as it is global and set to be ignored\n", atom_ctx.nlist.net_name(atom_net_id).c_str());