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-rw-r--r--kernel/rtlil.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 47dc098a..b8c9e21a 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -370,7 +370,7 @@ namespace {
void check()
{
- if (cell->type == "$not" || cell->type == "$pos" || cell->type == "$neg") {
+ if (cell->type == "$not" || cell->type == "$pos" || cell->type == "$bu0" || cell->type == "$neg") {
param("\\A_SIGNED");
port("\\A", param("\\A_WIDTH"));
port("\\Y", param("\\Y_WIDTH"));