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Extend ExclusiveDatabase to query SigSpec-s (for $pmux)

This commit is contained in:
Eddie Hung 2019-06-07 15:34:16 -07:00
parent 9b408838f1
commit ba52d9b471
1 changed files with 26 additions and 18 deletions
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36
passes/opt/muxpack.cc
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@ -29,7 +29,7 @@ struct ExclusiveDatabase
Module *module;
const SigMap &sigmap;
dict<SigSpec, SigSpec> sig_cmp_prev;
dict<SigBit, SigSpec> sig_cmp_prev;
dict<SigSpec, pool<SigSpec>> sig_exclusive;
ExclusiveDatabase(Module *module, const SigMap &sigmap) : module(module), sigmap(sigmap)
@ -62,16 +62,23 @@ struct ExclusiveDatabase
bool query(const SigSpec& sig1, const SigSpec& sig2) const
{
auto it = sig_cmp_prev.find(sig1);
// FIXME: O(N)
for (auto bit1 : sig1.bits()) {
auto it = sig_cmp_prev.find(bit1);
if (it == sig_cmp_prev.end())
return false;
auto jt = sig_cmp_prev.find(sig2);
for (auto bit2 : sig2.bits()) {
auto jt = sig_cmp_prev.find(bit2);
if (jt == sig_cmp_prev.end())
return false;
log("query = %s %s\n", log_signal(it->second), log_signal(jt->second));
return it->second == jt->second;
if (it->second != jt->second)
return false;
}
}
return true;
}
};
@ -144,7 +151,6 @@ struct MuxpackWorker
void find_chain_start_cells()
{
Cell* first_cell = nullptr;
for (auto cell : candidate_cells)
{
log_debug("Considering %s (%s)\n", log_id(cell), log_id(cell->type));
@ -157,13 +163,6 @@ struct MuxpackWorker
if (!sig_chain_prev.count(a_sig))
a_sig = b_sig;
if (first_cell) {
SigSpec s_sig = sigmap(cell->getPort("\\S"));
SigSpec prev_s_sig = sigmap(first_cell->getPort("\\S"));
if (!excl_db.query(prev_s_sig, s_sig))
goto start_cell;
}
}
else if (cell->type == "$pmux") {
if (!sig_chain_prev.count(a_sig))
@ -175,11 +174,19 @@ struct MuxpackWorker
if (sigbit_with_non_chain_users.count(bit))
goto start_cell;
{
Cell *prev_cell = sig_chain_prev.at(a_sig);
log_assert(prev_cell);
SigSpec s_sig = sigmap(cell->getPort("\\S"));
SigSpec next_s_sig = sigmap(prev_cell->getPort("\\S"));
if (!excl_db.query(s_sig, next_s_sig))
goto start_cell;
}
continue;
start_cell:
chain_start_cells.insert(cell);
first_cell = cell;
}
}
@ -243,6 +250,7 @@ struct MuxpackWorker
s_sig.append(cursor_cell->getPort("\\S"));
}
else {
log_assert(cursor_cell->type == "$mux");
b_sig.append(cursor_cell->getPort("\\A"));
s_sig.append(module->LogicNot(NEW_ID, cursor_cell->getPort("\\S")));
}