mirror of https://github.com/YosysHQ/yosys.git
93 lines
2.1 KiB
Plaintext
93 lines
2.1 KiB
Plaintext
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pattern reduce
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udata <vector<Cell*>> chain longest_chain
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udata <pool<Cell*>> non_first_cells
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code
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non_first_cells.clear();
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subpattern(setup);
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endcode
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match first
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select first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
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filter !non_first_cells.count(first)
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//generate
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// SigSpec A = module->addWire(NEW_ID);
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// SigSpec B = module->addWire(NEW_ID);
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// SigSpec Y = module->addWire(NEW_ID);
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// switch (rng(3))
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// {
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// case 0:
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// module->addAndGate(NEW_ID, A, B, Y);
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// break;
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// case 1:
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// module->addOrGate(NEW_ID, A, B, Y);
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// break;
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// case 2:
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// module->addXorGate(NEW_ID, A, B, Y);
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// break;
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// }
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endmatch
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code
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longest_chain.clear();
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chain.push_back(first);
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subpattern(tail);
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finally
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chain.pop_back();
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log_assert(chain.empty());
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if (GetSize(longest_chain) > 1)
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accept;
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endcode
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// ------------------------------------------------------------------
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subpattern setup
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match first
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select first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
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endmatch
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match next
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select nusers(port(next, \Q)) == 2
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select next->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
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index <IdString> next->type === first->type
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index <SigSpec> port(next, \Q) === port(first, \D)
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endmatch
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code
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non_first_cells.insert(next);
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endcode
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// ------------------------------------------------------------------
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subpattern tail
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arg first
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match next
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semioptional
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select nusers(port(next, \Q)) == 2
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select next->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
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index <IdString> next->type === chain.back()->type
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index <SigSpec> port(next, \Q) === port(chain.back(), \D)
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//generate 10
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// SigSpec A = module->addWire(NEW_ID);
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// SigSpec B = module->addWire(NEW_ID);
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// SigSpec Y = port(chain.back().first, chain.back().second);
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// Cell *c = module->addAndGate(NEW_ID, A, B, Y);
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// c->type = chain.back().first->type;
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endmatch
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code
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if (next) {
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chain.push_back(next);
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subpattern(tail);
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} else {
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if (GetSize(chain) > GetSize(longest_chain))
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longest_chain = chain;
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}
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finally
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if (next)
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chain.pop_back();
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endcode
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