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-rw-r--r--passes/techmap/pmux2shiftx.cc3
1 files changed, 1 insertions, 2 deletions
diff --git a/passes/techmap/pmux2shiftx.cc b/passes/techmap/pmux2shiftx.cc
index f8cdf5783..6ffc27a4c 100644
--- a/passes/techmap/pmux2shiftx.cc
+++ b/passes/techmap/pmux2shiftx.cc
@@ -65,8 +65,7 @@ struct Pmux2ShiftxPass : public Pass {
const int clog2width = ceil(log2(s_width));
RTLIL::SigSpec pmux_b;
- pmux_b.append(RTLIL::Const(0, clog2width));
- for (int i = s_width-1; i > 0; i--)
+ for (int i = s_width-1; i >= 0; i--)
pmux_b.append(RTLIL::Const(i, clog2width));
shiftx_a.append(cell->getPort("\\B"));
pmux_s.append(cell->getPort("\\S"));