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[core] skip adding opin when it does not drive any inputs inside a gsb

This commit is contained in:
tangxifan 2024-08-10 23:19:06 -07:00
parent 542571ce89
commit 4f80b1a28a
1 changed files with 17 additions and 0 deletions
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17
openfpga/src/annotation/annotate_rr_graph.cpp
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@ -288,6 +288,23 @@ static RRGSB build_rr_gsb(const DeviceContext& vpr_device_ctx,
is_opin_direct_connected_ipin(vpr_device_ctx.rr_graph, inode)) {
continue;
}
if (vpr_device_ctx.rr_graph.num_configurable_edges(inode)) {
/* If none of the outgoing edges drive any input node in this GSB, also skip it */
bool drive_local_inputs = false;
for (auto iedge : vpr_device_ctx.rr_graph.num_edges(inode)) {
RRNodeId des_node = vpr_device_ctx.rr_graph.edge_sink_node(iedge);
e_side curr_node_side = NUM_SIDES;
int curr_node_idx = -1;
rr_gsb.get_node_side_and_index(vpr_device_ctx.rr_graph, des_node, curr_node_side, curr_node_idx);
if (NUM_SIDES != curr_node_side && -1 != curr_node_idx) {
drive_local_inputs = true;
break;
}
}
if (!drive_local_inputs) {
continue;
}
}
/* Grid[x+1][y+1] Bottom side outputs pins */
rr_gsb.add_opin_node(inode, side_manager.get_side());