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Merge pull request #2082 from YosysHQ/eddie/abc9_scc_fixes

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abc9: fixes around handling combinatorial loops
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Eddie Hung 2020-06-03 17:35:46 -07:00 • committed by GitHub
commit 45cd323055
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3 changed files with 18 additions and 3 deletions
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6
passes/techmap/abc9_ops.cc
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@ -719,8 +719,10 @@ void prep_xaiger(RTLIL::Module *module, bool dff)
bit_users[bit].insert(cell->name);
if (cell->output(conn.first) && !abc9_flop)
for (auto bit : sigmap(conn.second))
bit_drivers[bit].insert(cell->name);
for (const auto &chunk : conn.second.chunks())
if (!chunk.wire->get_bool_attribute(ID::abc9_keep))
for (auto b : sigmap(SigSpec(chunk)))
bit_drivers[b].insert(cell->name);
}
toposort.node(cell->name);
}