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-rw-r--r--passes/opt/opt_clean.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/passes/opt/opt_clean.cc b/passes/opt/opt_clean.cc
index 15bbf54e..004a2078 100644
--- a/passes/opt/opt_clean.cc
+++ b/passes/opt/opt_clean.cc
@@ -295,8 +295,8 @@ void rmunused_module(RTLIL::Module *module, bool purge_mode, bool verbose)
std::vector<RTLIL::Cell*> delcells;
for (auto cell : module->cells())
- if (cell->type == "$pos") {
- bool is_signed = cell->getParam("\\A_SIGNED").as_bool();
+ if (cell->type.in("$pos", "$_BUF_")) {
+ bool is_signed = cell->type == "$pos" && cell->getParam("\\A_SIGNED").as_bool();
RTLIL::SigSpec a = cell->getPort("\\A");
RTLIL::SigSpec y = cell->getPort("\\Y");
a.extend_u0(SIZE(y), is_signed);