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-rw-r--r--passes/techmap/extract_fa.cc12
1 files changed, 8 insertions, 4 deletions
diff --git a/passes/techmap/extract_fa.cc b/passes/techmap/extract_fa.cc
index 29700c37b..9f3bb525b 100644
--- a/passes/techmap/extract_fa.cc
+++ b/passes/techmap/extract_fa.cc
@@ -262,10 +262,14 @@ struct ExtractFaWorker
pool<SigBit> new_leaves = leaves;
new_leaves.erase(bit);
- if (cell->hasPort(ID::A)) new_leaves.insert(sigmap(SigBit(cell->getPort(ID::A))));
- if (cell->hasPort(ID::B)) new_leaves.insert(sigmap(SigBit(cell->getPort(ID::B))));
- if (cell->hasPort(ID(C))) new_leaves.insert(sigmap(SigBit(cell->getPort(ID(C)))));
- if (cell->hasPort(ID(D))) new_leaves.insert(sigmap(SigBit(cell->getPort(ID(D)))));
+ for (auto port : {ID::A, ID::B, ID(C), ID(D)}) {
+ if (!cell->hasPort(port))
+ continue;
+ auto bit = sigmap(SigBit(cell->getPort(port)));
+ if (!bit.wire)
+ continue;
+ new_leaves.insert(bit);
+ }
if (GetSize(new_leaves) > maxbreadth)
continue;