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-rw-r--r--frontends/ast/simplify.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index 7b5ae064..449ade43 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -441,7 +441,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
int width = children[1]->range_left - children[1]->range_right + 1;
if (width != int(children[0]->bits.size())) {
RTLIL::SigSpec sig(children[0]->bits);
- sig.extend(width, children[0]->is_signed);
+ sig.extend_u0(width, children[0]->is_signed);
delete children[0];
children[0] = mkconst_bits(sig.as_const().bits, children[0]->is_signed);
}