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write_xaiger to preserve POs even if driven by constant

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This commit is contained in:
Eddie Hung 2019-06-12 15:44:30 -07:00
parent 2e7b3eee40
commit fb2758aade
1 changed files with 6 additions and 7 deletions
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13
backends/aiger/xaiger.cc
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@ -142,8 +142,10 @@ struct XAigerWriter
SigBit wirebit(wire, i); SigBit wirebit(wire, i);
SigBit bit = sigmap(wirebit); SigBit bit = sigmap(wirebit);
undriven_bits.insert(bit); if (bit.wire) {
unused_bits.insert(bit); undriven_bits.insert(bit);
unused_bits.insert(bit);
}
if (wire->port_input || keep) { if (wire->port_input || keep) {
if (bit != wirebit) if (bit != wirebit)
@ -154,7 +156,8 @@ struct XAigerWriter
if (wire->port_output || keep) { if (wire->port_output || keep) {
if (bit != wirebit) { if (bit != wirebit) {
alias_map[wirebit] = bit; alias_map[wirebit] = bit;
undriven_bits.insert(wirebit); if (!bit.wire)
undriven_bits.insert(wirebit);
} }
output_bits.insert(wirebit); output_bits.insert(wirebit);
} }
@ -480,10 +483,6 @@ struct XAigerWriter
} }
} }
// Erase all POs that are undriven
if (!holes_mode)
for (auto bit : undriven_bits)
output_bits.erase(bit);
for (auto bit : unused_bits) for (auto bit : unused_bits)
undriven_bits.erase(bit); undriven_bits.erase(bit);