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-rw-r--r--passes/techmap/abc9_ops.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/passes/techmap/abc9_ops.cc b/passes/techmap/abc9_ops.cc
index d08c42e3b..52beae421 100644
--- a/passes/techmap/abc9_ops.cc
+++ b/passes/techmap/abc9_ops.cc
@@ -572,7 +572,10 @@ void prep_lut(RTLIL::Design *design, int maxlut)
continue;
log_assert(cell->getParam(ID(SRC_WIDTH)) == 1);
log_assert(cell->getParam(ID(DST_WIDTH)) == 1);
+ SigBit s = cell->getPort(ID(SRC));
SigBit d = cell->getPort(ID(DST));
+ log_assert(s.wire->port_input);
+ log_assert(d.wire->port_output);
if (o == SigBit())
o = d;
else