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Improvements in "bufnorm" pass

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Signed-off-by: Claire Xenia Wolf <claire@clairexen.net>
This commit is contained in:
Claire Xenia Wolf 2023-09-29 07:04:22 +02:00 • committed by Martin Povišer
parent 4d469f461b
commit d027ead4b5
2 changed files with 156 additions and 74 deletions
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229
passes/techmap/bufnorm.cc
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@ -35,20 +35,29 @@ struct BufnormPass : public Pass {
log("buffer cells, than can be chained in a canonical order.\n");
log("\n");
log("Running 'bufnorm' on the whole design enters 'buffered-normalized mode'.\n");
log("The commands 'bufnorm -conn' exits 'buffered-normalized mode' again.\n");
log("\n");
log(" -bits\n");
log(" Create single-bit $_BUF_ cells instead of multi-bit $pos cells.\n");
log(" -buf\n");
log(" Create $buf cells for all buffers. The default is to use $_BUF_ cells\n");
log(" for sigle-bit buffers and $buf cells only for multi-bit buffers.\n");
log("\n");
log(" -chain\n");
log(" Chain all alias wires. By default only wires with the 'keep'\n");
log(" attribute on them are chained.\n");
log(" Chain all alias wires. By default only wires with positive-valued\n");
log(" 'chain' or 'keep' attribute on them are chained.\n");
log("\n");
log(" -chain-outputs\n");
log(" Chain ouput ports. (Uneffected by -flat.)\n");
log(" -output\n");
log(" Enable chaining of ouput ports wires.\n");
log("\n");
log(" -public\n");
log(" Enable chaining of wires wth public names.\n");
log("\n");
log(" -nochain\n");
log(" Disable chaining of wires with 'chain' attribute.\n");
log("\n");
log(" -nokeep\n");
log(" Disable chaining of wires with 'keep' attribute.\n");
log("\n");
log(" -flat\n");
log(" Do not chain any wires, not even the ones marked with 'keep'.\n");
log(" Alias for -nokeep and -nochain.\n");
log("\n");
log(" -nosticky\n");
log(" Disable 'sticky' behavior of output ports already driving whole\n");
@ -59,41 +68,71 @@ struct BufnormPass : public Pass {
log(" to chain 'keep' wires first, then ports in declaration order,\n");
log(" and then the other wires in alphanumeric sort order.)\n");
log("\n");
log(" -noinit\n");
log(" Do not move 'init' attributes to the wires on FF output ports.\n");
log("\n");
log("Run 'bufnorm' with -pos, -bits, or -conn on the whole design to remove all\n");
log("$buf buffer cells and exit 'buffered-normalized mode' again.\n");
log("\n");
log(" -pos\n");
log(" Create (multi- and single-bit) $pos cells instead $buf and $_BUF_.\n");
log("\n");
log(" -bits\n");
log(" Create arrays of $_BUF_ cells instead of multi-bit $buf cells.\n");
log("\n");
log(" -conn\n");
log(" Remove buffers and exit 'buffered-normalized mode'.\n");
log(" Create 'direct connections' instead of buffer cells.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
log_header(design, "Executing BUFNORM pass (convert to buffer-normalized form).\n");
bool connections_mode = false, bits_mode = false;
bool chain_mode = false, flat_mode = false, nosticky_mode = false;
bool chain_outputs_mode = false, alphasort_mode = false;
IdString buf_celltype, buf_inport = ID::A, buf_outport = ID::Y;
bool buf_mode = false;
bool chain_mode = false;
bool output_mode = false;
bool public_mode = false;
bool nochain_mode = false;
bool nokeep_mode = false;
bool nosticky_mode = false;
bool alphasort_mode = false;
bool noinit_mode = false; // FIXME: Actually move init attributes
bool pos_mode = false;
bool bits_mode = false;
bool conn_mode = false;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
std::string arg = args[argidx];
if (arg == "-conn") {
connections_mode = true;
continue;
}
if (arg == "-bits") {
bits_mode = true;
if (arg == "-buf") {
buf_mode = true;
continue;
}
if (arg == "-chain") {
chain_mode = true;
continue;
}
if (arg == "-chain-outputs") {
chain_outputs_mode = true;
if (arg == "-output") {
output_mode = true;
continue;
}
if (arg == "-public") {
public_mode = true;
continue;
}
if (arg == "-nochain") {
nochain_mode = true;
continue;
}
if (arg == "-nokeep") {
nokeep_mode = true;
continue;
}
if (arg == "-flat") {
flat_mode = true;
nochain_mode = true;
nokeep_mode = true;
continue;
}
if (arg == "-nosticky") {
@ -104,21 +143,34 @@ struct BufnormPass : public Pass {
alphasort_mode = true;
continue;
}
//if (arg == "-buf" && argidx+3 < args.size()) {
// buf_celltype = RTLIL::escape_id(args[++argidx]);
// buf_inport = RTLIL::escape_id(args[++argidx]);
// buf_outport = RTLIL::escape_id(args[++argidx]);
// continue;
//}
if (arg == "-noinit") {
noinit_mode = true;
continue;
}
if (arg == "-pos") {
pos_mode = true;
continue;
}
if (arg == "-bits") {
bits_mode = true;
continue;
}
if (arg == "-conn") {
conn_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
if (chain_mode && flat_mode)
log_cmd_error("Options -chain and -flat are exclusive.\n");
if (buf_mode && pos_mode)
log_cmd_error("Options -buf and -pos are exclusive.\n");
if (buf_celltype == IdString())
buf_celltype = bits_mode ? ID($_BUF_) : ID($pos);
if (buf_mode && conn_mode)
log_cmd_error("Options -buf and -conn are exclusive.\n");
if (pos_mode && conn_mode)
log_cmd_error("Options -pos and -conn are exclusive.\n");
for (auto module : design->selected_modules())
{
@ -131,11 +183,11 @@ struct BufnormPass : public Pass {
vector<Cell*> old_buffers;
for (auto cell : module->cells())
{
if (cell->type != buf_celltype)
if (!cell->type.in(ID($buf), ID($_BUF_)))
continue;
SigSpec insig = sigmap(cell->getPort(buf_inport));
SigSpec outsig = sigmap(cell->getPort(buf_outport));
SigSpec insig = sigmap(cell->getPort(ID::A));
SigSpec outsig = sigmap(cell->getPort(ID::Y));
for (int i = 0; i < GetSize(insig) && i < GetSize(outsig); i++)
sigmap.add(insig[i], outsig[i]);
old_buffers.push_back(cell);
@ -166,35 +218,65 @@ struct BufnormPass : public Pass {
}
}
struct {
bool alphasort_mode;
bool operator()(Wire *a, Wire *b) const
auto chain_this_wire_f = [&](Wire *wire)
{
if (chain_mode)
return true;
if (output_mode && wire->port_output)
return true;
if (public_mode && wire->name.isPublic())
return true;
if (!nokeep_mode && wire->get_bool_attribute(ID::keep))
return true;
if (!nochain_mode && wire->get_bool_attribute(ID::chain))
return true;
return false;
};
auto compare_wires_f = [&](Wire *a, Wire *b)
{
// Chaining wires first, then flat wires
bool chain_a = chain_this_wire_f(a);
bool chain_b = chain_this_wire_f(b);
if (chain_a != chain_b) return chain_a;
if (!alphasort_mode)
{
if (!alphasort_mode)
{
// Wires with keep attribute first
bool keep_a = a->get_bool_attribute(ID::keep);
bool keep_b = a->get_bool_attribute(ID::keep);
if (keep_a != keep_b) return keep_a;
// Ports before non-ports
if ((a->port_id != 0) != (b->port_id != 0))
return a->port_id != 0;
// Ports in declaration order
if (a->port_id != b->port_id)
return a->port_id < b->port_id;
// Wires with 'chain' attribute first, high values before low values
if (!nochain_mode) {
int chain_a_val = a->attributes.at(ID::chain, Const(0)).as_int();
int chain_b_val = b->attributes.at(ID::chain, Const(0)).as_int();
if (chain_a_val != chain_b_val) return chain_a_val > chain_b_val;
}
// Nets with public names first
if (a->name.isPublic() != b->name.isPublic())
return a->name.isPublic();
// Then wires with 'keep' attribute
if (!nokeep_mode) {
bool keep_a = a->get_bool_attribute(ID::keep);
bool keep_b = b->get_bool_attribute(ID::keep);
if (keep_a != keep_b) return keep_a;
}
// Otherwise just sort by name alphanumerically
return a->name.str() < b->name.str();
// Ports before non-ports
if ((a->port_id != 0) != (b->port_id != 0))
return a->port_id != 0;
// Ports in declaration order
if (a->port_id != b->port_id)
return a->port_id < b->port_id;
}
} compareWires;
compareWires.alphasort_mode = alphasort_mode;
// Nets with public names first
if (a->name.isPublic() != b->name.isPublic())
return a->name.isPublic();
// Otherwise just sort by name alphanumerically
return a->name.str() < b->name.str();
};
for (auto cell : module->cells())
{
@ -213,7 +295,7 @@ struct BufnormPass : public Pass {
SigSpec keysig = sigmap(conn.second);
auto it = whole_wires.find(keysig);
if (it != whole_wires.end()) {
it->second.sort(compareWires);
it->second.sort(compare_wires_f);
w = *(it->second.begin());
} else {
w = module->addWire(NEW_ID, GetSize(conn.second));
@ -236,14 +318,10 @@ struct BufnormPass : public Pass {
pool<Cell*> added_buffers;
unmapped_wires.sort(compareWires);
unmapped_wires.sort(compare_wires_f);
for (auto wire : unmapped_wires)
{
bool chain_this_wire = chain_mode;
if (!flat_mode && wire->get_bool_attribute(ID::keep))
chain_this_wire = true;
if (chain_outputs_mode && wire->port_output)
chain_this_wire = true;
bool chain_this_wire = chain_this_wire_f(wire);
SigSpec keysig = sigmap(wire), insig = wire, outsig = wire;
for (int i = 0; i < GetSize(insig); i++)
@ -255,10 +333,10 @@ struct BufnormPass : public Pass {
log(" %s %s for %s -> %s\n",
chain_this_wire ? "chaining" : "adding",
connections_mode ? "connection" : "buffer",
conn_mode ? "connection" : "buffer",
log_signal(insig), log_signal(outsig));
if (connections_mode) {
if (conn_mode) {
if (bits_mode) {
for (int i = 0; i < GetSize(insig) && i < GetSize(outsig); i++)
module->connect(outsig[i], insig[i]);
@ -267,17 +345,20 @@ struct BufnormPass : public Pass {
}
} else {
if (bits_mode) {
IdString celltype = pos_mode ? ID($pos) : buf_mode ? ID($buf) : ID($_BUF_);
for (int i = 0; i < GetSize(insig) && i < GetSize(outsig); i++) {
Cell *c = module->addCell(NEW_ID, buf_celltype);
c->setPort(buf_inport, insig[i]);
c->setPort(buf_outport, outsig[i]);
Cell *c = module->addCell(NEW_ID, celltype);
c->setPort(ID::A, insig[i]);
c->setPort(ID::Y, outsig[i]);
c->fixup_parameters();
added_buffers.insert(c);
}
} else {
Cell *c = module->addCell(NEW_ID, buf_celltype);
c->setPort(buf_inport, insig);
c->setPort(buf_outport, outsig);
IdString celltype = pos_mode ? ID($pos) : buf_mode ? ID($buf) :
GetSize(outsig) == 1 ? ID($_BUF_) : ID($buf);
Cell *c = module->addCell(NEW_ID, celltype);
c->setPort(ID::A, insig);
c->setPort(ID::Y, outsig);
c->fixup_parameters();
added_buffers.insert(c);
}