diff options
Diffstat (limited to 'backends/aiger')
| -rw-r--r-- | backends/aiger/xaiger.cc | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc index ed0e48e01..8651f3a01 100644 --- a/backends/aiger/xaiger.cc +++ b/backends/aiger/xaiger.cc @@ -436,15 +436,22 @@ struct XAigerWriter for (const auto &bit : output_bits) { ordered_outputs[bit] = aig_o++; int aig; - // For inout/keep bits only, the output bit - // should be driven by logic, not the PI, - // so temporarily swap that out + // Unlike bit2aig() which checks aig_map first, for + // inout/keep bits, since aig_map will point to + // the PI, first attempt to find the NOT/AND driver + // before resorting to an aig_map lookup (which + // could be another PO) if (input_bits.count(bit)) { - auto it = aig_map.find(bit); - int input_aig = it->second; - aig_map.erase(it); - aig = bit2aig(bit); - aig_map.at(bit) = input_aig; + if (not_map.count(bit)) { + aig = bit2aig(not_map.at(bit)) ^ 1; + } else if (and_map.count(bit)) { + auto args = and_map.at(bit); + int a0 = bit2aig(args.first); + int a1 = bit2aig(args.second); + aig = mkgate(a0, a1); + } + else + aig = aig_map.at(bit); } else aig = bit2aig(bit); |