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-rw-r--r--frontends/ast/simplify.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index bd3e09c4b..4d7c4f522 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -1531,6 +1531,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
detectSignWidth(width_hint, sign_hint);
while (children[0]->simplify(const_fold, at_zero, in_lvalue, stage, width_hint, sign_hint, in_param)) { }
if (children[0]->type == AST_CONSTANT && children[0]->bits_only_01()) {
+ children[0]->is_signed = sign_hint;
RTLIL::Const case_expr = children[0]->bitsAsConst(width_hint, sign_hint);
std::vector<AstNode*> new_children;
new_children.push_back(children[0]);