diff options
Diffstat (limited to 'passes/sat/sat.cc')
| -rw-r--r-- | passes/sat/sat.cc | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/passes/sat/sat.cc b/passes/sat/sat.cc index 87bff4c48..a9a00d8a2 100644 --- a/passes/sat/sat.cc +++ b/passes/sat/sat.cc @@ -103,10 +103,30 @@ struct SatHelper RTLIL::SigSpec rhs = it.second->attributes.at("\\init"); log_assert(lhs.width == rhs.width); - log("Import set-constraint from init attribute: %s = %s\n", log_signal(lhs), log_signal(rhs)); - big_lhs.remove2(lhs, &big_rhs); - big_lhs.append(lhs); - big_rhs.append(rhs); + RTLIL::SigSpec removed_bits; + for (int i = 0; i < lhs.width; i++) { + RTLIL::SigSpec bit = lhs.extract(i, 1); + if (!satgen.initial_state.check_all(bit)) { + removed_bits.append(bit); + lhs.remove(i, 1); + rhs.remove(i, 1); + i--; + } + } + + lhs.optimize(); + rhs.optimize(); + removed_bits.optimize(); + + if (removed_bits.width) + log("Warning: ignoring initial value on non-register: %s\n", log_signal(removed_bits)); + + if (lhs.width) { + log("Import set-constraint from init attribute: %s = %s\n", log_signal(lhs), log_signal(rhs)); + big_lhs.remove2(lhs, &big_rhs); + big_lhs.append(lhs); + big_rhs.append(rhs); + } } for (auto &s : sets_init) |