Fixed handling of undef values in POS cells in ConstEval

diff --git a/kernel/calc.cc b/kernel/calc.cc
index efb09c3987706e975f1c75638117d2caec6cf855..f2cbd6f42406b73130f4d0daca37c085722da34d 100644 (file)
--- a/kernel/calc.cc
+++ b/kernel/calc.cc
@@ -418,9 +418,7 @@ RTLIL::Const RTLIL::const_pos(const RTLIL::Const &arg1, const RTLIL::Const&, boo
        RTLIL::Const arg1_ext = arg1;
        while (int(arg1_ext.bits.size()) < result_len)
                arg1_ext.bits.push_back(signed1 && arg1_ext.bits.size() ? arg1_ext.bits.back() : RTLIL::State::S0);
-
-       RTLIL::Const zero(RTLIL::State::S0, 1);
-       return RTLIL::const_add(zero, arg1_ext, false, signed1, result_len);
+       return arg1_ext;
 }
 
 RTLIL::Const RTLIL::const_neg(const RTLIL::Const &arg1, const RTLIL::Const&, bool signed1, bool, int result_len)