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Improved opt_merge support for $pmux cells

This commit is contained in:
Clifford Wolf 2016-03-31 09:58:55 +02:00
parent 6f1b6dc322
commit 6cafd08ac1
1 changed files with 46 additions and 4 deletions
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50
passes/opt/opt_merge.cc
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@ -45,6 +45,29 @@ struct OptMergeWorker
dict<const RTLIL::Cell*, std::string> cell_hash_cache;
#endif
static void sort_pmux_conn(dict<RTLIL::IdString, RTLIL::SigSpec> &conn)
{
SigSpec sig_s = conn.at("\\S");
SigSpec sig_b = conn.at("\\B");
int s_width = GetSize(sig_s);
int width = GetSize(sig_b) / s_width;
vector<pair<SigBit, SigSpec>> sb_pairs;
for (int i = 0; i < s_width; i++)
sb_pairs.push_back(pair<SigBit, SigSpec>(sig_s[i], sig_b.extract(i*width, width)));
std::sort(sb_pairs.begin(), sb_pairs.end());
conn["\\S"] = SigSpec();
conn["\\B"] = SigSpec();
for (auto &it : sb_pairs) {
conn["\\S"].append(it.first);
conn["\\B"].append(it.second);
}
}
#ifdef USE_CELL_HASH_CACHE
std::string int_to_hash_string(unsigned int v)
{
@ -91,25 +114,40 @@ struct OptMergeWorker
assign_map.apply(alt_conn.at("\\A"));
alt_conn.at("\\A").sort_and_unify();
conn = &alt_conn;
} else
if (cell->type == "$pmux") {
alt_conn = *conn;
assign_map.apply(alt_conn.at("\\A"));
assign_map.apply(alt_conn.at("\\B"));
assign_map.apply(alt_conn.at("\\S"));
sort_pmux_conn(alt_conn);
conn = &alt_conn;
}
vector<string> hash_conn_strings;
for (auto &it : *conn) {
if (cell->output(it.first))
continue;
RTLIL::SigSpec sig = it.second;
assign_map.apply(sig);
hash_string += "C " + it.first.str() + "=";
string s = "C " + it.first.str() + "=";
for (auto &chunk : sig.chunks()) {
if (chunk.wire)
hash_string += "{" + chunk.wire->name.str() + " " +
s += "{" + chunk.wire->name.str() + " " +
int_to_hash_string(chunk.offset) + " " +
int_to_hash_string(chunk.width) + "}";
else
hash_string += RTLIL::Const(chunk.data).as_string();
s += RTLIL::Const(chunk.data).as_string();
}
hash_string += "\n";
hash_conn_strings.push_back(s + "\n");
}
std::sort(hash_conn_strings.begin(), hash_conn_strings.end());
for (auto it : hash_conn_strings)
hash_string += it;
cell_hash_cache[cell] = sha1(hash_string);
return cell_hash_cache[cell];
}
@ -171,6 +209,10 @@ struct OptMergeWorker
if (cell1->type == "$reduce_and" || cell1->type == "$reduce_or" || cell1->type == "$reduce_bool") {
conn1["\\A"].sort_and_unify();
conn2["\\A"].sort_and_unify();
} else
if (cell1->type == "$pmux") {
sort_pmux_conn(conn1);
sort_pmux_conn(conn2);
}
if (conn1 != conn2) {