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-rw-r--r--passes/opt/opt_expr.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/passes/opt/opt_expr.cc b/passes/opt/opt_expr.cc
index 07cdf4652..f9e40869d 100644
--- a/passes/opt/opt_expr.cc
+++ b/passes/opt/opt_expr.cc
@@ -371,13 +371,13 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
if (cell->type.in("$reduce_and", "$_AND_"))
detect_const_and = true;
- if (cell->type.in("$and", "$logic_and") && GetSize(cell->getPort("\\A")) == 1 && GetSize(cell->getPort("\\B")) == 1)
+ if (cell->type.in("$and", "$logic_and") && GetSize(cell->getPort("\\A")) == 1 && GetSize(cell->getPort("\\B")) == 1 && !cell->getParam("\\A_SIGNED").as_bool())
detect_const_and = true;
if (cell->type.in("$reduce_or", "$reduce_bool", "$_OR_"))
detect_const_or = true;
- if (cell->type.in("$or", "$logic_or") && GetSize(cell->getPort("\\A")) == 1 && GetSize(cell->getPort("\\B")) == 1)
+ if (cell->type.in("$or", "$logic_or") && GetSize(cell->getPort("\\A")) == 1 && GetSize(cell->getPort("\\B")) == 1 && !cell->getParam("\\A_SIGNED").as_bool())
detect_const_or = true;
if (detect_const_and || detect_const_or)