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Improved opt_share for commutative standard cells

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This commit is contained in:
Clifford Wolf 2013-03-29 11:01:26 +01:00
parent d60fbaf664
commit 0d48b846ac
1 changed files with 28 additions and 1 deletions
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29
passes/opt/opt_share.cc
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@ -65,7 +65,20 @@ struct OptShareWorker
for (auto &it : cell->parameters)
hash_string += "P " + it.first + "=" + it.second.as_string() + "\n";
for (auto &it : cell->connections) {
const std::map<RTLIL::IdString, RTLIL::SigSpec> *conn = &cell->connections;
std::map<RTLIL::IdString, RTLIL::SigSpec> alt_conn;
if (cell->type == "$and" || cell->type == "$or" || cell->type == "$xor" || cell->type == "$xnor" || cell->type == "$add" || cell->type == "$mul" ||
cell->type == "$logic_and" || cell->type == "$logic_or" || cell->type == "$_AND_" || cell->type == "$_OR_" || cell->type == "$_XOR_") {
alt_conn = *conn;
if (assign_map(alt_conn.at("\\A")) < assign_map(alt_conn.at("\\B"))) {
alt_conn["\\A"] = conn->at("\\B");
alt_conn["\\B"] = conn->at("\\A");
}
conn = &alt_conn;
}
for (auto &it : *conn) {
if (ct.cell_output(cell->type, it.first))
continue;
RTLIL::SigSpec sig = it.second;
@ -126,6 +139,20 @@ struct OptShareWorker
assign_map.apply(it.second);
}
if (cell1->type == "$and" || cell1->type == "$or" || cell1->type == "$xor" || cell1->type == "$xnor" || cell1->type == "$add" || cell1->type == "$mul" ||
cell1->type == "$logic_and" || cell1->type == "$logic_or" || cell1->type == "$_AND_" || cell1->type == "$_OR_" || cell1->type == "$_XOR_") {
if (conn1.at("\\A") < conn1.at("\\B")) {
RTLIL::SigSpec tmp = conn1["\\A"];
conn1["\\A"] = conn1["\\B"];
conn1["\\B"] = tmp;
}
if (conn2.at("\\A") < conn2.at("\\B")) {
RTLIL::SigSpec tmp = conn2["\\A"];
conn2["\\A"] = conn2["\\B"];
conn2["\\B"] = tmp;
}
}
if (conn1 != conn2) {
lt = conn1 < conn2;
return true;