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Speed up TopoSort. The main sorting algorithm implementation in TopoSort::sort_worker is 11-12x faster. Overall, the complete sequence of building the graph and sorting is about 2.5-3x faster. The overall impact in e.g. the replace_const_cells optimization pass is a ~25% speedup. End-to-end impact on our synthesis flow is about 3%.

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This commit is contained in:
Rasmus Munk Larsen 2023-09-20 15:49:05 -07:00
parent 8fb807cd24
commit e0042bdff7
5 changed files with 126 additions and 79 deletions
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passes/techmap/flatten.cc
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@ -312,7 +312,7 @@ struct FlattenPass : public Pass {
for (auto cell : module->selected_cells()) {
RTLIL::Module *tpl = design->module(cell->type);
if (tpl != nullptr) {
if (topo_modules.database.count(tpl) == 0)
if (!topo_modules.has_edges(tpl))
worklist.insert(tpl);
topo_modules.edge(tpl, module);
}