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Support various binary operators in opt_share

This commit is contained in:
Bogdan Vukobratovic 2019-08-04 19:06:38 +02:00
parent d8be5ce6ba
commit 6a796accc0
5 changed files with 531 additions and 206 deletions
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1
Makefile
View File

@ -678,6 +678,7 @@ test: $(TARGETS) $(EXTRA_TARGETS)
+cd tests/asicworld && bash run-test.sh $(SEEDOPT)
# +cd tests/realmath && bash run-test.sh $(SEEDOPT)
+cd tests/share && bash run-test.sh $(SEEDOPT)
+cd tests/opt_share && bash run-test.sh $(SEEDOPT)
+cd tests/fsm && bash run-test.sh $(SEEDOPT)
+cd tests/techmap && bash run-test.sh
+cd tests/memories && bash run-test.sh $(ABCOPT) $(SEEDOPT)

610
passes/opt/opt_share.cc
View File

@ -32,37 +32,36 @@ PRIVATE_NAMESPACE_BEGIN
SigMap assign_map;
struct InPort {
struct OpMuxConn {
RTLIL::SigSpec sig;
RTLIL::Cell *pmux;
int port_id;
RTLIL::Cell *alu;
RTLIL::Cell *mux;
RTLIL::Cell *op;
int mux_port_id;
int mux_port_offset;
int op_outsig_offset;
InPort(RTLIL::SigSpec s, RTLIL::Cell *c, int p, RTLIL::Cell *a = NULL) : sig(s), pmux(c), port_id(p), alu(a) {}
bool operator<(const OpMuxConn &other) const
{
if (mux != other.mux)
return mux < other.mux;
if (mux_port_id != other.mux_port_id)
return mux_port_id < other.mux_port_id;
return mux_port_offset < other.mux_port_offset;
}
};
// Helper class that to track whether a SigSpec is signed and whether it is
// connected to the \\B port of the $sub cell, which makes its sign prefix
// negative.
// Helper class to track additiona information about a SigSpec, like whether it is signed and the semantics of the port it is connected to
struct ExtSigSpec {
RTLIL::SigSpec sig;
RTLIL::SigSpec sign;
bool is_signed;
RTLIL::IdString semantics;
ExtSigSpec() {}
ExtSigSpec(RTLIL::SigSpec s, bool sign = false, bool is_signed = false) : sig(s), sign(sign), is_signed(is_signed) {}
ExtSigSpec(RTLIL::Cell *cell, RTLIL::IdString port_name, SigMap *sigmap)
{
sign = (port_name == "\\B") ? cell->getPort("\\BI") : RTLIL::Const(0, 1);
sig = (*sigmap)(cell->getPort(port_name));
is_signed = false;
if (cell->hasParam(port_name.str() + "_SIGNED")) {
is_signed = cell->getParam(port_name.str() + "_SIGNED").as_bool();
}
}
ExtSigSpec(RTLIL::SigSpec s, RTLIL::SigSpec sign = RTLIL::Const(0, 1), bool is_signed = false, RTLIL::IdString semantics = RTLIL::IdString()) : sig(s), sign(sign), is_signed(is_signed), semantics(semantics) {}
bool empty() const { return sig.empty(); }
@ -74,42 +73,136 @@ struct ExtSigSpec {
if (sign != other.sign)
return sign < other.sign;
return is_signed < other.is_signed;
if (is_signed != other.is_signed)
return is_signed < other.is_signed;
return semantics < other.semantics;
}
bool operator==(const RTLIL::SigSpec &other) const { return (sign != RTLIL::Const(0, 1)) ? false : sig == other; }
bool operator==(const ExtSigSpec &other) const { return is_signed == other.is_signed && sign == other.sign && sig == other.sig; }
bool operator==(const ExtSigSpec &other) const { return is_signed == other.is_signed && sign == other.sign && sig == other.sig && semantics == other.semantics; }
};
void merge_operators(RTLIL::Module *module, RTLIL::Cell *mux, const std::vector<InPort> &ports, int offset, int width,
const ExtSigSpec &operand)
#define BITWISE_OPS "$_AND_", "$_NAND_", "$_OR_", "$_NOR_", "$_XOR_", "$_XNOR_", "$_ANDNOT_", "$_ORNOT_", "$and", "$or", "$xor", "$xnor"
#define REDUCTION_OPS "$reduce_and", "$reduce_or", "$reduce_xor", "$reduce_xnor", "$reduce_bool", "$reduce_nand"
#define LOGICAL_OPS "$logic_and", "$logic_or"
#define SHIFT_OPS "$shl", "$shr", "$sshl", "$sshr", "$shift", "$shiftx"
#define RELATIONAL_OPS "$lt", "$le", "$eq", "$ne", "$eqx", "$nex", "$ge", "$gt"
bool cell_supported(RTLIL::Cell *cell)
{
if (cell->type.in("$alu")) {
RTLIL::SigSpec sig_bi = cell->getPort("\\BI");
RTLIL::SigSpec sig_ci = cell->getPort("\\CI");
if (sig_bi.is_fully_const() && sig_ci.is_fully_const() && sig_bi == sig_ci)
return true;
} else if (cell->type.in(LOGICAL_OPS, SHIFT_OPS, BITWISE_OPS, RELATIONAL_OPS, "$add", "$sub", "$mul", "$div", "$mod", "$concat")) {
return true;
}
return false;
}
std::map<std::string, std::string> mergeable_type_map{
{"$sub", "$add"},
};
bool mergeable(RTLIL::Cell *a, RTLIL::Cell *b)
{
auto a_type = a->type;
if (mergeable_type_map.count(a_type.str()))
a_type = mergeable_type_map.at(a_type.str());
auto b_type = b->type;
if (mergeable_type_map.count(b_type.str()))
b_type = mergeable_type_map.at(b_type.str());
return a_type == b_type;
}
RTLIL::IdString decode_port_semantics(RTLIL::Cell *cell, RTLIL::IdString port_name)
{
if (cell->type.in("$lt", "$le", "$ge", "$gt", "$div", "$mod", "$concat", SHIFT_OPS) && port_name == "\\B")
return port_name;
return "";
}
RTLIL::SigSpec decode_port_sign(RTLIL::Cell *cell, RTLIL::IdString port_name) {
if (cell->type == "$alu" && port_name == "\\B")
return cell->getPort("\\BI");
else if (cell->type == "$sub" && port_name == "\\B")
return RTLIL::Const(1, 1);
return RTLIL::Const(0, 1);
}
bool decode_port_signed(RTLIL::Cell *cell, RTLIL::IdString port_name)
{
if (cell->type.in(BITWISE_OPS, LOGICAL_OPS))
return false;
if (cell->hasParam(port_name.str() + "_SIGNED"))
return cell->getParam(port_name.str() + "_SIGNED").as_bool();
return false;
}
ExtSigSpec decode_port(RTLIL::Cell *cell, RTLIL::IdString port_name, SigMap *sigmap)
{
auto sig = (*sigmap)(cell->getPort(port_name));
RTLIL::SigSpec sign = decode_port_sign(cell, port_name);
RTLIL::IdString semantics = decode_port_semantics(cell, port_name);
bool is_signed = decode_port_signed(cell, port_name);
return ExtSigSpec(sig, sign, is_signed, semantics);
}
void merge_operators(RTLIL::Module *module, RTLIL::Cell *mux, const std::vector<OpMuxConn> &ports, const ExtSigSpec &operand)
{
std::vector<ExtSigSpec> muxed_operands;
int max_width = 0;
for (const auto& p : ports) {
auto op = p.alu;
auto op = p.op;
for (RTLIL::IdString port_name : {"\\A", "\\B"}) {
if (op->getPort(port_name) != operand.sig) {
auto operand = ExtSigSpec(op, port_name, &assign_map);
if (operand.sig.size() > max_width) {
max_width = operand.sig.size();
}
muxed_operands.push_back(operand);
}
RTLIL::IdString muxed_port_name = "\\A";
if (op->getPort("\\A") == operand.sig) {
muxed_port_name = "\\B";
}
auto operand = decode_port(op, muxed_port_name, &assign_map);
if (operand.sig.size() > max_width) {
max_width = operand.sig.size();
}
muxed_operands.push_back(operand);
}
auto shared_op = ports[0].op;
if (std::any_of(muxed_operands.begin(), muxed_operands.end(), [&](ExtSigSpec &op) { return op.sign != muxed_operands[0].sign; }))
if (max_width < shared_op->getParam("\\Y_WIDTH").as_int())
max_width = shared_op->getParam("\\Y_WIDTH").as_int();
for (auto &operand : muxed_operands) {
operand.sig.extend_u0(max_width, operand.is_signed);
}
auto shared_op = ports[0].alu;
for (const auto& p : ports) {
auto op = p.alu;
auto op = p.op;
if (op == shared_op)
continue;
module->remove(op);
@ -126,40 +219,47 @@ void merge_operators(RTLIL::Module *module, RTLIL::Cell *mux, const std::vector<
RTLIL::SigSpec mux_b = mux->getPort("\\B");
RTLIL::SigSpec mux_s = mux->getPort("\\S");
RTLIL::SigSpec alu_x = shared_op->getPort("\\X");
RTLIL::SigSpec alu_co = shared_op->getPort("\\CO");
RTLIL::SigSpec shared_pmux_a = RTLIL::Const(RTLIL::State::Sx, max_width);
RTLIL::SigSpec shared_pmux_b;
RTLIL::SigSpec shared_pmux_s;
shared_op->setPort("\\Y", shared_op->getPort("\\Y").extract(0, width));
int conn_width = ports[0].sig.size();
int conn_offset = ports[0].mux_port_offset;
shared_op->setPort("\\Y", shared_op->getPort("\\Y").extract(0, conn_width));
if (mux->type == "$pmux") {
shared_pmux_s = RTLIL::SigSpec();
for (const auto&p: ports) {
shared_pmux_s.append(mux_s[p.port_id]);
mux_b.replace(p.port_id * mux_a.size() + offset, shared_op->getPort("\\Y"));
for (const auto &p : ports) {
shared_pmux_s.append(mux_s[p.mux_port_id]);
mux_b.replace(p.mux_port_id * mux_a.size() + conn_offset, shared_op->getPort("\\Y"));
}
} else {
shared_pmux_s = RTLIL::SigSpec{mux_s, module->Not(NEW_ID, mux_s)};
mux_a.replace(offset, shared_op->getPort("\\Y"));
mux_b.replace(offset, shared_op->getPort("\\Y"));
mux_a.replace(conn_offset, shared_op->getPort("\\Y"));
mux_b.replace(conn_offset, shared_op->getPort("\\Y"));
}
mux->setPort("\\A", mux_a);
mux->setPort("\\B", mux_b);
mux->setPort("\\Y", mux_y);
mux->setPort("\\S", mux_s);
mux->setPort("\\B", mux_b);
for (const auto &op : muxed_operands)
shared_pmux_b.append(op.sig);
auto mux_to_oper = module->Pmux(NEW_ID, shared_pmux_a, shared_pmux_b, shared_pmux_s);
shared_op->setPort("\\X", alu_x.extract(0, width));
shared_op->setPort("\\CO", alu_co.extract(0, width));
shared_op->setParam("\\Y_WIDTH", width);
if (shared_op->type.in("$alu")) {
RTLIL::SigSpec alu_x = shared_op->getPort("\\X");
RTLIL::SigSpec alu_co = shared_op->getPort("\\CO");
shared_op->setPort("\\X", alu_x.extract(0, conn_width));
shared_op->setPort("\\CO", alu_co.extract(0, conn_width));
}
shared_op->setParam("\\Y_WIDTH", conn_width);
if (shared_op->getPort("\\A") == operand.sig) {
shared_op->setPort("\\B", mux_to_oper);
@ -173,11 +273,9 @@ void merge_operators(RTLIL::Module *module, RTLIL::Cell *mux, const std::vector<
typedef struct {
RTLIL::Cell *mux;
std::vector<InPort> ports;
int offset;
int width;
std::vector<OpMuxConn> ports;
ExtSigSpec shared_operand;
} shared_op_t;
} merged_op_t;
template <typename T> void remove_val(std::vector<T> &v, const std::vector<T> &vals)
@ -190,86 +288,60 @@ template <typename T> void remove_val(std::vector<T> &v, const std::vector<T> &v
}
}
bool find_op_res_width(int offset, int &width, std::vector<InPort*>& ports, const dict<RTLIL::SigBit, RTLIL::SigSpec> &op_outbit_to_outsig)
void check_muxed_operands(std::vector<const OpMuxConn *> &ports, const ExtSigSpec &shared_operand)
{
std::vector<RTLIL::SigSpec> op_outsigs;
dict<int, std::set<InPort*>> op_outsig_span;
auto it = ports.begin();
ExtSigSpec seed;
std::transform(ports.begin(), ports.end(), std::back_inserter(op_outsigs), [&](InPort *p) { return op_outbit_to_outsig.at(p->sig[offset]); });
while (it != ports.end()) {
auto p = *it;
auto op = p->op;
std::vector<bool> finished(ports.size(), false);
width = 0;
std::function<bool()> all_finished = [&] { return std::find(std::begin(finished), std::end(finished), false) == end(finished);};
while (!all_finished())
{
++offset;
++width;
if (offset >= ports[0]->sig.size()) {
for (size_t i = 0; i < op_outsigs.size(); ++i) {
if (finished[i])
continue;
op_outsig_span[width].insert(ports[i]);
finished[i] = true;
}
break;
RTLIL::IdString muxed_port_name = "\\A";
if (op->getPort("\\A") == shared_operand.sig) {
muxed_port_name = "\\B";
}
for (size_t i = 0; i < op_outsigs.size(); ++i) {
if (finished[i])
continue;
auto operand = decode_port(op, muxed_port_name, &assign_map);
if ((width >= op_outsigs[i].size()) || (ports[i]->sig[offset] != op_outsigs[i][width])) {
op_outsig_span[width].insert(ports[i]);
finished[i] = true;
}
if (seed.empty())
seed = operand;
if (operand.is_signed != seed.is_signed) {
ports.erase(it);
} else {
++it;
}
}
for (auto w: op_outsig_span) {
if (w.second.size() > 1) {
width = w.first;
ports.erase(std::remove_if(ports.begin(), ports.end(), [&](InPort *p) { return !w.second.count(p); }), ports.end());
return true;
}
}
return false;
}
ExtSigSpec find_shared_operand(InPort* seed, std::vector<InPort *> &ports, const std::map<ExtSigSpec, std::set<RTLIL::Cell *>> &operand_to_users)
ExtSigSpec find_shared_operand(const OpMuxConn* seed, std::vector<const OpMuxConn *> &ports, const std::map<ExtSigSpec, std::set<RTLIL::Cell *>> &operand_to_users)
{
std::set<RTLIL::Cell *> alus_using_operand;
std::set<RTLIL::Cell *> alus_set;
std::set<RTLIL::Cell *> ops_using_operand;
std::set<RTLIL::Cell *> ops_set;
for(const auto& p: ports)
alus_set.insert(p->alu);
ops_set.insert(p->op);
ExtSigSpec oper;
auto op_a = seed->alu;
auto op_a = seed->op;
for (RTLIL::IdString port_name : {"\\A", "\\B"}) {
oper = ExtSigSpec(op_a, port_name, &assign_map);
oper = decode_port(op_a, port_name, &assign_map);
auto operand_users = operand_to_users.at(oper);
if (operand_users.size() == 1)
continue;
alus_using_operand.clear();
std::set_intersection(operand_users.begin(), operand_users.end(), alus_set.begin(), alus_set.end(),
std::inserter(alus_using_operand, alus_using_operand.begin()));
ops_using_operand.clear();
for (auto mux_ops: ops_set)
if (operand_users.count(mux_ops))
ops_using_operand.insert(mux_ops);
if (alus_using_operand.size() > 1) {
ports.erase(std::remove_if(ports.begin(), ports.end(), [&](InPort *p) { return !alus_using_operand.count(p->alu); }),
ports.end());
if (ops_using_operand.size() > 1) {
ports.erase(std::remove_if(ports.begin(), ports.end(), [&](const OpMuxConn *p) { return !ops_using_operand.count(p->op); }),
ports.end());
return oper;
}
}
@ -277,40 +349,135 @@ ExtSigSpec find_shared_operand(InPort* seed, std::vector<InPort *> &ports, const
return ExtSigSpec();
}
void remove_multi_user_outbits(RTLIL::Module *module, dict<RTLIL::SigBit, RTLIL::SigSpec> &op_outbit_to_outsig)
dict<RTLIL::SigSpec, OpMuxConn> find_valid_op_mux_conns(RTLIL::Module *module, dict<RTLIL::SigBit, RTLIL::SigSpec> &op_outbit_to_outsig,
dict<RTLIL::SigSpec, RTLIL::Cell *> outsig_to_operator,
dict<RTLIL::SigBit, RTLIL::SigSpec> &op_aux_to_outsig)
{
dict<RTLIL::SigBit, int> op_outbit_user_cnt;
dict<RTLIL::SigSpec, int> op_outsig_user_track;
dict<RTLIL::SigSpec, OpMuxConn> op_mux_conn_map;
std::function<void(RTLIL::SigSpec)> remove_outsig = [&](RTLIL::SigSpec outsig) {
for (auto op_outbit : outsig)
op_outbit_to_outsig.erase(op_outbit);
if (op_mux_conn_map.count(outsig))
op_mux_conn_map.erase(outsig);
};
std::function<void(RTLIL::SigBit)> remove_outsig_from_aux_bit = [&](RTLIL::SigBit auxbit) {
auto aux_outsig = op_aux_to_outsig.at(auxbit);
auto op = outsig_to_operator.at(aux_outsig);
auto op_outsig = assign_map(op->getPort("\\Y"));
remove_outsig(op_outsig);
for (auto aux_outbit : aux_outsig)
op_aux_to_outsig.erase(aux_outbit);
};
std::function<void(RTLIL::Cell *)>
find_op_mux_conns = [&](RTLIL::Cell *mux) {
RTLIL::SigSpec sig;
int mux_port_size;
if (mux->type.in("$mux", "$_MUX_")) {
mux_port_size = mux->getPort("\\A").size();
sig = RTLIL::SigSpec{mux->getPort("\\B"), mux->getPort("\\A")};
} else {
mux_port_size = mux->getPort("\\A").size();
sig = mux->getPort("\\B");
}
auto mux_insig = assign_map(sig);
for (int i = 0; i < mux_insig.size(); ++i) {
if (op_aux_to_outsig.count(mux_insig[i])) {
remove_outsig_from_aux_bit(mux_insig[i]);
continue;
}
if (!op_outbit_to_outsig.count(mux_insig[i]))
continue;
auto op_outsig = op_outbit_to_outsig.at(mux_insig[i]);
if (op_mux_conn_map.count(op_outsig)) {
remove_outsig(op_outsig);
continue;
}
int mux_port_id = i / mux_port_size;
int mux_port_offset = i % mux_port_size;
int op_outsig_offset;
for (op_outsig_offset = 0; op_outsig[op_outsig_offset] != mux_insig[i]; ++op_outsig_offset)
;
int j = op_outsig_offset;
do {
if (!op_outbit_to_outsig.count(mux_insig[i]))
break;
if (op_outbit_to_outsig.at(mux_insig[i]) != op_outsig)
break;
++i;
++j;
} while ((i / mux_port_size == mux_port_id) && (j < op_outsig.size()));
int op_conn_width = j - op_outsig_offset;
OpMuxConn inp = {
op_outsig.extract(op_outsig_offset, op_conn_width),
mux,
outsig_to_operator.at(op_outsig),
mux_port_id,
mux_port_offset,
op_outsig_offset,
};
op_mux_conn_map[op_outsig] = inp;
--i;
}
};
std::function<void(RTLIL::SigSpec)> remove_connected_ops = [&](RTLIL::SigSpec sig) {
auto mux_insig = assign_map(sig);
for (auto outbit : mux_insig) {
if (op_aux_to_outsig.count(outbit)) {
remove_outsig_from_aux_bit(outbit);
continue;
}
std::function<void(SigSpec)> update_op_outbit_user_cnt = [&](SigSpec sig) {
auto outsig = assign_map(sig);
for (auto outbit : outsig) {
if (!op_outbit_to_outsig.count(outbit))
continue;
if (++op_outbit_user_cnt[outbit] > 1) {
auto alu_outsig = op_outbit_to_outsig.at(outbit);
for (auto outbit : alu_outsig)
op_outbit_to_outsig.erase(outbit);
}
remove_outsig(op_outbit_to_outsig.at(outbit));
}
};
for (auto cell : module->cells())
for (auto &conn : cell->connections())
if (cell->input(conn.first))
update_op_outbit_user_cnt(conn.second);
for (auto cell : module->cells()) {
if (cell->type.in("$mux", "$_MUX_", "$pmux")) {
remove_connected_ops(cell->getPort("\\S"));
find_op_mux_conns(cell);
} else {
for (auto &conn : cell->connections())
if (cell->input(conn.first))
remove_connected_ops(conn.second);
}
}
for (auto w : module->wires()) {
if (!w->port_output)
continue;
update_op_outbit_user_cnt(w);
remove_connected_ops(w);
}
return op_mux_conn_map;
}
struct OptSharePass : public Pass {
OptSharePass() : Pass("opt_share", "merge arithmetic operators that share an operand") {}
OptSharePass() : Pass("opt_share", "merge mutually exclusive cells of the same type that share an input signal") {}
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
@ -318,18 +485,19 @@ struct OptSharePass : public Pass {
log(" opt_share [selection]\n");
log("\n");
log("This pass identifies mutually exclusive $alu arithmetic cells that:\n");
log(" (a) share an input operand\n");
log("This pass identifies mutually exclusive cells of the same type that:\n");
log(" (a) share an input signal\n");
log(" (b) drive the same $mux, $_MUX_, or $pmux multiplexing cell allowing\n");
log(" the $alu cell to be merged and the multiplexer to be moved from\n");
log(" multiplexing its output to multiplexing the non-shared input operands.\n");
log(" the cell to be merged and the multiplexer to be moved from\n");
log(" multiplexing its output to multiplexing the non-shared input signals.\n");
log("\n");
}
void execute(std::vector<std::string>, RTLIL::Design *design) YS_OVERRIDE
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
log_header(design, "Executing OPT_SHARE pass.\n");
extra_args(args, 1, design);
for (auto module : design->selected_modules()) {
assign_map.clear();
assign_map.set(module);
@ -337,28 +505,30 @@ struct OptSharePass : public Pass {
std::map<ExtSigSpec, std::set<RTLIL::Cell *>> operand_to_users;
dict<RTLIL::SigSpec, RTLIL::Cell *> outsig_to_operator;
dict<RTLIL::SigBit, RTLIL::SigSpec> op_outbit_to_outsig;
dict<RTLIL::SigBit, RTLIL::SigSpec> op_aux_to_outsig;
bool any_shared_operands = false;
std::vector<ExtSigSpec> op_insigs;
for (auto cell : module->cells()) {
if (!cell->type.in("$alu"))
if (!cell_supported(cell))
continue;
RTLIL::SigSpec sig_bi = cell->getPort("\\BI");
RTLIL::SigSpec sig_ci = cell->getPort("\\CI");
if (cell->type == "$alu") {
for (RTLIL::IdString port_name : {"\\X", "\\CO"}) {
auto mux_insig = assign_map(cell->getPort(port_name));
outsig_to_operator[mux_insig] = cell;
for (auto outbit : mux_insig)
op_aux_to_outsig[outbit] = mux_insig;
}
}
if ((!sig_bi.is_fully_const()) || (!sig_ci.is_fully_const()) || (sig_bi != sig_ci))
continue;
RTLIL::SigSpec sig_y = cell->getPort("\\A");
auto outsig = assign_map(cell->getPort("\\Y"));
outsig_to_operator[outsig] = cell;
for (auto outbit : outsig)
op_outbit_to_outsig[outbit] = outsig;
auto mux_insig = assign_map(cell->getPort("\\Y"));
outsig_to_operator[mux_insig] = cell;
for (auto outbit : mux_insig)
op_outbit_to_outsig[outbit] = mux_insig;
for (RTLIL::IdString port_name : {"\\A", "\\B"}) {
auto op_insig = ExtSigSpec(cell, port_name, &assign_map);
auto op_insig = decode_port(cell, port_name, &assign_map);
op_insigs.push_back(op_insig);
operand_to_users[op_insig].insert(cell);
if (operand_to_users[op_insig].size() > 1)
@ -371,89 +541,117 @@ struct OptSharePass : public Pass {
// Operator outputs need to be exclusively connected to the $mux inputs in order to be mergeable. Hence we count to
// how many points are operator output bits connected.
remove_multi_user_outbits(module, op_outbit_to_outsig);
dict<RTLIL::SigSpec, OpMuxConn> op_mux_conn_map =
find_valid_op_mux_conns(module, op_outbit_to_outsig, outsig_to_operator, op_aux_to_outsig);
std::vector<shared_op_t> shared_ops;
for (auto cell : module->cells()) {
if (!cell->type.in("$mux", "$_MUX_", "$pmux"))
continue;
// Group op connections connected to same ports of the same $mux. Sort them in ascending order of their port offset
dict<RTLIL::Cell*, std::vector<std::set<OpMuxConn>>> mux_port_op_conns;
for (auto& val: op_mux_conn_map) {
OpMuxConn p = val.second;
auto& mux_port_conns = mux_port_op_conns[p.mux];
RTLIL::SigSpec sig_a = cell->getPort("\\A");
RTLIL::SigSpec sig_b = cell->getPort("\\B");
RTLIL::SigSpec sig_s = cell->getPort("\\S");
if (mux_port_conns.size() == 0) {
int mux_port_num;
std::vector<InPort> ports;
if (p.mux->type.in("$mux", "$_MUX_"))
mux_port_num = 2;
else
mux_port_num = p.mux->getPort("\\S").size();
if (cell->type.in("$mux", "$_MUX_")) {
ports.push_back(InPort(assign_map(sig_a), cell, 0));
ports.push_back(InPort(assign_map(sig_b), cell, 1));
} else {
RTLIL::SigSpec sig_s = cell->getPort("\\S");
for (int i = 0; i < sig_s.size(); i++) {
auto inp = sig_b.extract(i * sig_a.size(), sig_a.size());
ports.push_back(InPort(assign_map(inp), cell, i));
}
mux_port_conns.resize(mux_port_num);
}
mux_port_conns[p.mux_port_id].insert(p);
}
std::vector<merged_op_t> merged_ops;
for (auto& val: mux_port_op_conns) {
RTLIL::Cell* cell = val.first;
auto &mux_port_conns = val.second;
const OpMuxConn *seed = NULL;
// Look through the bits of the $mux inputs and see which of them are connected to the operator
// results. Operator results can be concatenated with other signals before led to the $mux.
for (int i = 0; i < sig_a.size(); ++i) {
std::vector<InPort*> alu_ports;
for (auto& p: ports)
if (op_outbit_to_outsig.count(p.sig[i])) {
p.alu = outsig_to_operator.at(op_outbit_to_outsig.at(p.sig[i]));
alu_ports.push_back(&p);
}
while (true) {
int alu_port_width = 0;
while (alu_ports.size() > 1) {
std::vector<InPort*> shared_ports(alu_ports);
auto seed = alu_ports[0];
alu_ports.erase(alu_ports.begin());
// Find ports whose $alu-s share an operand with $alu connected to the seed port
auto shared_operand = find_shared_operand(seed, shared_ports, operand_to_users);
if (shared_operand.empty())
continue;
// Some bits of the operator results might be unconnected. Calculate the number of conneted
// bits.
if (!find_op_res_width(i, alu_port_width, shared_ports, op_outbit_to_outsig))
break;
if (shared_ports.size() < 2)
break;
// Remember the combination for the merger
std::vector<InPort> shared_p;
for (auto p: shared_ports)
shared_p.push_back(*p);
shared_ops.push_back(shared_op_t{cell, shared_p, i, alu_port_width, shared_operand});
// Remove merged ports from the list and try to find other mergers for the mux
remove_val(alu_ports, shared_ports);
// Remove either the merged ports from the last iteration or the seed that failed to yield a merger
if (seed != NULL) {
mux_port_conns[seed->mux_port_id].erase(*seed);
seed = NULL;
}
if (alu_port_width)
i += alu_port_width - 1;
// For a new merger, find the seed op connection that starts at lowest port offset among port connections
for (auto &port_conns : mux_port_conns) {
if (!port_conns.size())
continue;
const OpMuxConn *next_p = &(*port_conns.begin());
if ((seed == NULL) || (seed->mux_port_offset > next_p->mux_port_offset))
seed = next_p;
}
// Cannot find the seed -> nothing to do for this $mux anymore
if (seed == NULL)
break;
// Find all other op connections that start from the same port offset, and whose ops can be merged with the seed op
std::vector<const OpMuxConn *> mergeable_conns;
for (auto &port_conns : mux_port_conns) {
if (!port_conns.size())
continue;
const OpMuxConn *next_p = &(*port_conns.begin());
if ((next_p->op_outsig_offset == seed->op_outsig_offset) &&
(next_p->mux_port_offset == seed->mux_port_offset) && mergeable(next_p->op, seed->op) &&
next_p->sig.size() == seed->sig.size())
mergeable_conns.push_back(next_p);
}
// We need at least two mergeable connections for the merger
if (mergeable_conns.size() < 2)
continue;
// Filter mergeable connections whose ops share an operand with seed connection's op
auto shared_operand = find_shared_operand(seed, mergeable_conns, operand_to_users);
if (shared_operand.empty())
continue;
check_muxed_operands(mergeable_conns, shared_operand);
if (mergeable_conns.size() < 2)
continue;
// Remember the combination for the merger
std::vector<OpMuxConn> merged_ports;
for (auto p : mergeable_conns) {
merged_ports.push_back(*p);
mux_port_conns[p->mux_port_id].erase(*p);
}
seed = NULL;
merged_ops.push_back(merged_op_t{cell, merged_ports, shared_operand});
design->scratchpad_set_bool("opt.did_something", true);
}
}
for (auto &shared : shared_ops) {
log(" Found arithmetic cells that share an operand and can be merged by moving the %s %s in front "
for (auto &shared : merged_ops) {
log(" Found cells that share an operand and can be merged by moving the %s %s in front "
"of "
"them:\n",
log_id(shared.mux->type), log_id(shared.mux));
for (const auto& op : shared.ports)
log(" %s\n", log_id(op.alu));
log(" %s\n", log_id(op.op));
log("\n");
merge_operators(module, shared.mux, shared.ports, shared.offset, shared.width, shared.shared_operand);
merge_operators(module, shared.mux, shared.ports, shared.shared_operand);
}
}
}

1
tests/opt_share/.gitignore vendored Normal file
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@ -0,0 +1 @@
temp

86
tests/opt_share/generate.py Normal file
View File

@ -0,0 +1,86 @@
#!/usr/bin/env python3
import argparse
import sys
import random
from contextlib import contextmanager
@contextmanager
def redirect_stdout(new_target):
old_target, sys.stdout = sys.stdout, new_target
try:
yield new_target
finally:
sys.stdout = old_target
def random_plus_x():
return "%s x" % random.choice(['+', '+', '+', '-', '-', '|', '&', '^'])
def maybe_plus_x(expr):
if random.randint(0, 4) == 0:
return "(%s %s)" % (expr, random_plus_x())
else:
return expr
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('-S', '--seed', type=int, help='seed for PRNG')
parser.add_argument('-c',
'--count',
type=int,
default=100,
help='number of test cases to generate')
args = parser.parse_args()
if args.seed is not None:
print("PRNG seed: %d" % args.seed)
random.seed(args.seed)
for idx in range(args.count):
with open('temp/uut_%05d.v' % idx, 'w') as f:
with redirect_stdout(f):
print('module uut_%05d(a, b, c, s, y);' % (idx))
op = random.choice([
random.choice(['+', '-', '*', '/', '%']),
random.choice(['<', '<=', '==', '!=', '===', '!==', '>=',
'>']),
random.choice(['<<', '>>', '<<<', '>>>']),
random.choice(['|', '&', '^', '~^', '||', '&&']),
])
print(' input%s [%d:0] a;' % (random.choice(['', ' signed']), 8))
print(' input%s [%d:0] b;' % (random.choice(['', ' signed']), 8))
print(' input%s [%d:0] c;' % (random.choice(['', ' signed']), 8))
print(' input s;')
print(' output [%d:0] y;' % 8)
ops1 = ['a', 'b']
ops2 = ['a', 'c']
random.shuffle(ops1)
random.shuffle(ops2)
cast1 = random.choice(['', '$signed', '$unsigned'])
cast2 = random.choice(['', '$signed', '$unsigned'])
print(' assign y = (s ? %s(%s %s %s) : %s(%s %s %s));' %
(cast1, ops1[0], op, ops1[1],
cast2, ops2[0], op, ops2[1]))
print('endmodule')
with open('temp/uut_%05d.ys' % idx, 'w') as f:
with redirect_stdout(f):
print('read_verilog temp/uut_%05d.v' % idx)
print('proc;;')
print('copy uut_%05d gold' % idx)
print('rename uut_%05d gate' % idx)
print('tee -a temp/all_share_log.txt log')
print('tee -a temp/all_share_log.txt log #job# uut_%05d' % idx)
print('tee -a temp/all_share_log.txt opt gate')
print('tee -a temp/all_share_log.txt opt_share gate')
print('tee -a temp/all_share_log.txt opt_clean gate')
print(
'miter -equiv -flatten -ignore_gold_x -make_outputs -make_outcmp gold gate miter'
)
print(
'sat -set-def-inputs -verify -prove trigger 0 -show-inputs -show-outputs miter'
)

39
tests/opt_share/run-test.sh Executable file
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@ -0,0 +1,39 @@
#!/bin/bash
# run this test many times:
# time bash -c 'for ((i=0; i<100; i++)); do echo "-- $i --"; bash run-test.sh || exit 1; done'
set -e
OPTIND=1
count=100
seed="" # default to no seed specified
while getopts "c:S:" opt
do
case "$opt" in
c) count="$OPTARG" ;;
S) seed="-S $OPTARG" ;;
esac
done
shift "$((OPTIND-1))"
rm -rf temp
mkdir -p temp
echo "generating tests.."
python3 generate.py -c $count $seed
echo "running tests.."
for i in $( ls temp/*.ys | sed 's,[^0-9],,g; s,^0*\(.\),\1,g;' ); do
echo -n "[$i]"
idx=$( printf "%05d" $i )
../../yosys -ql temp/uut_${idx}.log temp/uut_${idx}.ys
done
echo
failed_share=$( echo $( gawk '/^#job#/ { j=$2; db[j]=0; } /^Removing [246] cells/ { delete db[j]; } END { for (j in db) print(j); }' temp/all_share_log.txt ) )
if [ -n "$failed_share" ]; then
echo "Resource sharing failed for the following test cases: $failed_share"
false
fi
exit 0