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abc9: respect (* keep *) on cells

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This commit is contained in:
Eddie Hung 2020-01-13 19:21:11 -08:00
parent 9ec948f396
commit a6d4ea7463
3 changed files with 87 additions and 62 deletions
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2
passes/techmap/abc9_ops.cc
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@ -489,6 +489,8 @@ void reintegrate(RTLIL::Module *module)
std::vector<Cell*> boxes;
for (auto cell : module->cells().to_vector()) {
if (cell->has_keep_attr())
continue;
if (cell->type.in(ID($_AND_), ID($_NOT_), ID($__ABC9_FF_)))
module->remove(cell);
else if (cell->attributes.erase("\\abc9_box_seq"))