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Fix for less pessimism in muxpack and opt_tree_balance

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This commit is contained in:
Akash Levy 2024-08-29 23:44:57 -07:00
parent ab20bbbe8e
commit 8f26fa9077
2 changed files with 8 additions and 8 deletions
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7
passes/opt/muxpack.cc
View file

@ -152,23 +152,22 @@ struct MuxpackWorker
b_sig = sigmap(cell->getPort(ID::B));
SigSpec y_sig = sigmap(cell->getPort(ID::Y));
if (sig_chain_next.count(a_sig) && !a_sig.is_fully_const())
if (sig_chain_next.count(a_sig))
for (auto a_bit : a_sig.bits())
sigbit_with_non_chain_users.insert(a_bit);
else {
sig_chain_next[a_sig] = cell;
candidate_cells.insert(cell);
}
if (!b_sig.empty()) {
if (sig_chain_next.count(b_sig) && !b_sig.is_fully_const())
if (sig_chain_next.count(b_sig))
for (auto b_bit : b_sig.bits())
sigbit_with_non_chain_users.insert(b_bit);
else {
sig_chain_next[b_sig] = cell;
candidate_cells.insert(cell);
}
}
candidate_cells.insert(cell);
sig_chain_prev[y_sig] = cell;
continue;

9
passes/opt/opt_balance_tree.cc
View file

@ -63,27 +63,28 @@ struct OptBalanceTreeWorker {
SigSpec y_sig = sigmap(cell->getPort(ID::Y));
// If a_sig already has a chain user, mark its bits as having non-chain users
if (sig_chain_next.count(a_sig) && !a_sig.is_fully_const()) // ok if a_sig is fully const
if (sig_chain_next.count(a_sig))
for (auto a_bit : a_sig.bits())
sigbit_with_non_chain_users.insert(a_bit);
// Otherwise, mark cell as the next in the chain relative to a_sig
else {
sig_chain_next[a_sig] = cell;
candidate_cells.insert(cell);
}
if (!b_sig.empty()) {
// If b_sig already has a chain user, mark its bits as having non-chain users
if (sig_chain_next.count(b_sig) && !b_sig.is_fully_const()) // ok if b_sig is fully const
if (sig_chain_next.count(b_sig))
for (auto b_bit : b_sig.bits())
sigbit_with_non_chain_users.insert(b_bit);
// Otherwise, mark cell as the next in the chain relative to b_sig
else {
sig_chain_next[b_sig] = cell;
candidate_cells.insert(cell);
}
}
// Add cell as candidate
candidate_cells.insert(cell);
// Mark cell as the previous in the chain relative to y_sig
sig_chain_prev[y_sig] = cell;
}