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Do not clean up buffer cells with "keep" attribute, closes #1128 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-06-26 11:00:44 +02:00
parent b3c36b4448
commit 8e9ef891fe
1 changed files with 1 additions and 1 deletions
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2
passes/opt/opt_clean.cc
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@ -480,7 +480,7 @@ void rmunused_module(RTLIL::Module *module, bool purge_mode, bool verbose, bool
std::vector<RTLIL::Cell*> delcells;
for (auto cell : module->cells())
if (cell->type.in("$pos", "$_BUF_")) {
if (cell->type.in("$pos", "$_BUF_") && !cell->has_keep_attr()) {
bool is_signed = cell->type == "$pos" && cell->getParam("\\A_SIGNED").as_bool();
RTLIL::SigSpec a = cell->getPort("\\A");
RTLIL::SigSpec y = cell->getPort("\\Y");