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-rw-r--r--passes/sat/sat.cc4
1 files changed, 1 insertions, 3 deletions
diff --git a/passes/sat/sat.cc b/passes/sat/sat.cc
index bcc690fa3..430bba1e8 100644
--- a/passes/sat/sat.cc
+++ b/passes/sat/sat.cc
@@ -268,9 +268,7 @@ struct SatHelper
RTLIL::SigSpec removed_bits;
for (int i = 0; i < lhs.size(); i++) {
RTLIL::SigSpec bit = lhs.extract(i, 1);
- if (bit.is_fully_const() && rhs[i] == State::Sx)
- rhs[i] = bit;
- if (!satgen.initial_state.check_all(bit)) {
+ if (rhs[i] == State::Sx || !satgen.initial_state.check_all(bit)) {
removed_bits.append(bit);
lhs.remove(i, 1);
rhs.remove(i, 1);