mirror of https://github.com/YosysHQ/yosys.git
107 lines
2.2 KiB
Plaintext
107 lines
2.2 KiB
Plaintext
pattern reduce
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state <IdString> portname
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udata <vector<pair<Cell*, IdString>>> chain longest_chain
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udata <pool<Cell*>> non_first_cells
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udata <SigSpec> leaves
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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($_AND_, $_OR_, $_XOR_)
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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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leaves = SigSpec();
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longest_chain.clear();
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chain.push_back(make_pair(first, \A));
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subpattern(tail);
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chain.back().second = \B;
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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($_AND_, $_OR_, $_XOR_)
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endmatch
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code portname
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portname = \A;
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branch;
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portname = \B;
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endcode
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match next
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select nusers(port(next, \Y)) == 2
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select next->type.in($_AND_, $_OR_, $_XOR_)
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index <IdString> next->type === first->type
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index <SigSpec> port(next, \Y) === port(first, portname)
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endmatch
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code
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non_first_cells.insert(next);
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endcode
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// ------------------------------------------------------------------
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subpattern tail
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arg first
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match next
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semioptional
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select nusers(port(next, \Y)) == 2
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select next->type.in($_AND_, $_OR_, $_XOR_)
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index <IdString> next->type === chain.back().first->type
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index <SigSpec> port(next, \Y) === port(chain.back().first, chain.back().second)
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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(make_pair(next, \A));
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subpattern(tail);
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chain.back().second = \B;
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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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leaves.append(port(chain.back().first, chain.back().second));
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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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