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-rw-r--r--backends/aiger/xaiger.cc9
1 files changed, 6 insertions, 3 deletions
diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index 56d361fff..b0602dbd8 100644
--- a/backends/aiger/xaiger.cc
+++ b/backends/aiger/xaiger.cc
@@ -210,9 +210,12 @@ struct XAigerWriter
Wire *w = b.wire;
if (!w) continue;
if (cell->input(c.first)) {
- SigBit I = sigmap(b);
- if (!w->port_input)
- co_bits.insert(I);
+ if (!w->port_input) {
+ SigBit I = sigmap(b);
+ if (I != b)
+ alias_map[b] = I;
+ co_bits.insert(b);
+ }
}
else if (cell->output(c.first)) {
SigBit O = sigmap(b);