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optbarriers: add -noconns option

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This commit is contained in:
George Rennie
2026-09-30 09:52:46 +02:00
committed by nella
parent a453664779
commit 3fa36665cb
1 changed files with 25 additions and 14 deletions
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passes/cmds/optbarriers.cc
+25 -14
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@@ -33,6 +33,7 @@ struct OptBarriersPass : public Pass {
OptBarriersPass() : Pass("optbarriers", "insert optimization barriers") {}
void help() override {
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" optbarriers [options] [selection]\n");
log("\n");
@@ -45,6 +46,9 @@ struct OptBarriersPass : public Pass {
log(" -noprocs\n");
log(" don't add optimization barriers to the outputs of processes\n");
log("\n");
log(" -noconns\n");
log(" don't add optimization barriers to the left hand sides of connections\n");
log("\n");
log(" -private\n");
log(" also add optimization barriers to private wires\n");
log("\n");
@@ -58,6 +62,7 @@ struct OptBarriersPass : public Pass {
bool nocells_mode = false;
bool noprocs_mode = false;
bool noconns_mode = false;
bool private_mode = false;
bool remove_mode = false;
@@ -72,6 +77,10 @@ struct OptBarriersPass : public Pass {
noprocs_mode = true;
continue;
}
if (arg == "-noconns") {
noconns_mode = true;
continue;
}
if (arg == "-private") {
private_mode = true;
continue;
@@ -187,23 +196,25 @@ struct OptBarriersPass : public Pass {
}
// Rewrite connections
std::vector<RTLIL::SigSig> new_connections;
for (const auto& conn : module->connections()) {
RTLIL::SigSig skip_conn, barrier_conn;
if (!noconns_mode) {
std::vector<RTLIL::SigSig> new_connections;
for (const auto& conn : module->connections()) {
RTLIL::SigSig skip_conn, barrier_conn;
for (int i = 0; i < GetSize(conn.first); i++) {
auto& sigsig = skip(conn.first[i]) ? skip_conn : barrier_conn;
sigsig.first.append(conn.first[i]);
sigsig.second.append(conn.second[i]);
for (int i = 0; i < GetSize(conn.first); i++) {
auto& sigsig = skip(conn.first[i]) ? skip_conn : barrier_conn;
sigsig.first.append(conn.first[i]);
sigsig.second.append(conn.second[i]);
}
if (!skip_conn.first.empty())
new_connections.emplace_back(std::move(skip_conn));
if (!barrier_conn.first.empty())
module->addBarrier(NEW_ID, barrier_conn.second, barrier_conn.first);
}
if (!skip_conn.first.empty())
new_connections.emplace_back(std::move(skip_conn));
if (!barrier_conn.first.empty())
module->addBarrier(NEW_ID, barrier_conn.second, barrier_conn.first);
module->new_connections(new_connections);
}
module->new_connections(new_connections);
}
}