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muxpack verbosity and -ignore_excl option

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This commit is contained in:
Akash Levy 2024-07-25 04:40:37 -07:00
parent f1114cc98c
commit 0a997b9e64
1 changed files with 28 additions and 10 deletions
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38
passes/opt/muxpack.cc
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@ -180,40 +180,49 @@ struct MuxpackWorker
} }
} }
void find_chain_start_cells() void find_chain_start_cells(bool ignore_excl)
{ {
for (auto cell : candidate_cells) for (auto cell : candidate_cells)
{ {
log_debug("Considering %s (%s)\n", log_id(cell), log_id(cell->type)); log("Considering %s (%s)\n", log_id(cell), log_id(cell->type));
SigSpec a_sig = sigmap(cell->getPort(ID::A)); SigSpec a_sig = sigmap(cell->getPort(ID::A));
if (cell->type == ID($mux)) { if (cell->type == ID($mux)) {
SigSpec b_sig = sigmap(cell->getPort(ID::B)); SigSpec b_sig = sigmap(cell->getPort(ID::B));
if (sig_chain_prev.count(a_sig) + sig_chain_prev.count(b_sig) != 1) if (sig_chain_prev.count(a_sig) + sig_chain_prev.count(b_sig) != 1) {
log(" Going to start_cell: case 1...\n");
goto start_cell; goto start_cell;
}
if (!sig_chain_prev.count(a_sig)) if (!sig_chain_prev.count(a_sig))
a_sig = b_sig; a_sig = b_sig;
} }
else if (cell->type == ID($pmux)) { else if (cell->type == ID($pmux)) {
if (!sig_chain_prev.count(a_sig)) if (!sig_chain_prev.count(a_sig)) {
log(" Going to start_cell: case 2...\n");
goto start_cell; goto start_cell;
} }
}
else log_abort(); else log_abort();
for (auto bit : a_sig.bits()) for (auto bit : a_sig.bits())
if (sigbit_with_non_chain_users.count(bit)) if (sigbit_with_non_chain_users.count(bit)) {
log(" Going to start_cell: case 3...\n");
goto start_cell; goto start_cell;
}
{ {
Cell *prev_cell = sig_chain_prev.at(a_sig); Cell *prev_cell = sig_chain_prev.at(a_sig);
log_assert(prev_cell); log_assert(prev_cell);
SigSpec s_sig = sigmap(cell->getPort(ID::S)); SigSpec s_sig = sigmap(cell->getPort(ID::S));
s_sig.append(sigmap(prev_cell->getPort(ID::S))); s_sig.append(sigmap(prev_cell->getPort(ID::S)));
if (!excl_db.query(s_sig)) if (!excl_db.query(s_sig) && !ignore_excl) {
log(" Going to start_cell: case 4...\n");
goto start_cell; goto start_cell;
} }
}
log(" Continuing...\n");
continue; continue;
start_cell: start_cell:
@ -309,11 +318,11 @@ struct MuxpackWorker
candidate_cells.clear(); candidate_cells.clear();
} }
MuxpackWorker(Module *module) : MuxpackWorker(Module *module, bool ignore_excl) :
module(module), sigmap(module), mux_count(0), pmux_count(0), excl_db(module, sigmap) module(module), sigmap(module), mux_count(0), pmux_count(0), excl_db(module, sigmap)
{ {
make_sig_chain_next_prev(); make_sig_chain_next_prev();
find_chain_start_cells(); find_chain_start_cells(ignore_excl);
for (auto c : chain_start_cells) { for (auto c : chain_start_cells) {
vector<Cell*> chain = create_chain(c); vector<Cell*> chain = create_chain(c);
@ -330,7 +339,7 @@ struct MuxpackPass : public Pass {
{ {
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n"); log("\n");
log(" muxpack [selection]\n"); log(" muxpack [options] [selection]\n");
log("\n"); log("\n");
log("This pass converts cascaded chains of $pmux cells (e.g. those create from case\n"); log("This pass converts cascaded chains of $pmux cells (e.g. those create from case\n");
log("constructs) and $mux cells (e.g. those created by if-else constructs) into\n"); log("constructs) and $mux cells (e.g. those created by if-else constructs) into\n");
@ -340,14 +349,23 @@ struct MuxpackPass : public Pass {
log("whose select lines are driven by '$eq' cells with other such cells if it can be\n"); log("whose select lines are driven by '$eq' cells with other such cells if it can be\n");
log("certain that their select inputs are mutually exclusive.\n"); log("certain that their select inputs are mutually exclusive.\n");
log("\n"); log("\n");
log(" -ignore_excl\n");
log(" ignore mutually exclusive constraint when packing (less conservative)\n");
log("\n");
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) override void execute(std::vector<std::string> args, RTLIL::Design *design) override
{ {
bool ignore_excl = false;
log_header(design, "Executing MUXPACK pass ($mux cell cascades to $pmux).\n"); log_header(design, "Executing MUXPACK pass ($mux cell cascades to $pmux).\n");
size_t argidx; size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) for (argidx = 1; argidx < args.size(); argidx++)
{ {
if (args[argidx] == "-ignore_excl") {
ignore_excl = true;
continue;
}
break; break;
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);
@ -356,7 +374,7 @@ struct MuxpackPass : public Pass {
int pmux_count = 0; int pmux_count = 0;
for (auto module : design->selected_modules()) { for (auto module : design->selected_modules()) {
MuxpackWorker worker(module); MuxpackWorker worker(module, ignore_excl);
mux_count += worker.mux_count; mux_count += worker.mux_count;
pmux_count += worker.pmux_count; pmux_count += worker.pmux_count;
} }