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-rw-r--r--backends/rtlil/rtlil_backend.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/backends/rtlil/rtlil_backend.cc b/backends/rtlil/rtlil_backend.cc
index 7c7e26a93..574eb3aaa 100644
--- a/backends/rtlil/rtlil_backend.cc
+++ b/backends/rtlil/rtlil_backend.cc
@@ -51,7 +51,7 @@ void RTLIL_BACKEND::dump_const(std::ostream &f, const RTLIL::Const &data, int wi
}
}
f << stringf("%d'", width);
- if (data.is_fully_undef()) {
+ if (data.is_fully_undef_x_only()) {
f << "x";
} else {
for (int i = offset+width-1; i >= offset; i--) {