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opt_lut: Allow more than one -dlogic per cell type.

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Fixes #2061.
This commit is contained in:
Marcelina Kościelnicka 2021-07-29 16:55:15 +02:00
parent 3156226233
commit 54e75129e5
3 changed files with 55 additions and 24 deletions
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53
passes/opt/opt_lut.cc
View file

@ -24,16 +24,22 @@
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct dlogic_t {
IdString cell_type;
// LUT input idx -> hard cell's port name
dict<int, IdString> lut_input_port;
};
struct OptLutWorker
{
dict<IdString, dict<int, IdString>> &dlogic;
const std::vector<dlogic_t> &dlogic;
RTLIL::Module *module;
ModIndex index;
SigMap sigmap;
pool<RTLIL::Cell*> luts;
dict<RTLIL::Cell*, int> luts_arity;
dict<RTLIL::Cell*, pool<RTLIL::Cell*>> luts_dlogics;
dict<RTLIL::Cell*, pool<std::pair<int, RTLIL::Cell*>>> luts_dlogics;
dict<RTLIL::Cell*, pool<int>> luts_dlogic_inputs;
int eliminated_count = 0, combined_count = 0;
@ -64,7 +70,7 @@ struct OptLutWorker
void show_stats_by_arity()
{
dict<int, int> arity_counts;
dict<IdString, int> dlogic_counts;
std::vector<int> dlogic_counts(dlogic.size());
int max_arity = 0;
for (auto lut_arity : luts_arity)
@ -77,7 +83,7 @@ struct OptLutWorker
{
for (auto &lut_dlogic : lut_dlogics.second)
{
dlogic_counts[lut_dlogic->type]++;
dlogic_counts[lut_dlogic.first]++;
}
}
@ -87,13 +93,13 @@ struct OptLutWorker
if (arity_counts[arity])
log(" %d-LUT %16d\n", arity, arity_counts[arity]);
}
for (auto &dlogic_count : dlogic_counts)
for (int i = 0; i < GetSize(dlogic); i++)
{
log(" with %-12s %4d\n", dlogic_count.first.c_str(), dlogic_count.second);
log(" with %-12s (#%d) %4d\n", dlogic[i].cell_type.c_str(), i, dlogic_counts[i]);
}
}
OptLutWorker(dict<IdString, dict<int, IdString>> &dlogic, RTLIL::Module *module, int limit) :
OptLutWorker(const std::vector<dlogic_t> &dlogic, RTLIL::Module *module, int limit) :
dlogic(dlogic), module(module), index(module), sigmap(module)
{
log("Discovering LUTs.\n");
@ -116,20 +122,19 @@ struct OptLutWorker
// First, find all dedicated logic we're connected to. This results in an overapproximation
// of such connections.
pool<RTLIL::Cell*> lut_all_dlogics;
pool<std::pair<int, RTLIL::Cell*>> lut_all_dlogics;
for (int i = 0; i < lut_width; i++)
{
SigBit bit = lut_input[i];
for (auto &port : index.query_ports(bit))
{
if (dlogic.count(port.cell->type))
for (int j = 0; j < GetSize(dlogic); j++)
{
auto &dlogic_map = dlogic[port.cell->type];
if (dlogic_map.count(i))
if (dlogic[j].cell_type == port.cell->type)
{
if (port.port == dlogic_map[i])
if (port.port == dlogic[j].lut_input_port.at(i, IdString()))
{
lut_all_dlogics.insert(port.cell);
lut_all_dlogics.insert({j, port.cell});
}
}
}
@ -143,25 +148,25 @@ struct OptLutWorker
// * The connection is illegal.
// In either of these cases, we don't need to concern ourselves with preserving the connection
// between this LUT and this dedicated logic cell.
pool<RTLIL::Cell*> lut_legal_dlogics;
pool<std::pair<int, RTLIL::Cell*>> lut_legal_dlogics;
pool<int> lut_dlogic_inputs;
for (auto lut_dlogic : lut_all_dlogics)
{
auto &dlogic_map = dlogic[lut_dlogic->type];
auto &dlogic_map = dlogic[lut_dlogic.first].lut_input_port;
bool legal = true;
for (auto &dlogic_conn : dlogic_map)
{
if (lut_width <= dlogic_conn.first)
{
log_debug(" LUT has illegal connection to %s cell %s.%s.\n", lut_dlogic->type.c_str(), log_id(module), log_id(lut_dlogic));
log_debug(" LUT has illegal connection to %s cell %s.%s.\n", lut_dlogic.second->type.c_str(), log_id(module), log_id(lut_dlogic.second));
log_debug(" LUT input A[%d] not present.\n", dlogic_conn.first);
legal = false;
break;
}
if (sigmap(lut_input[dlogic_conn.first]) != sigmap(lut_dlogic->getPort(dlogic_conn.second)))
if (sigmap(lut_input[dlogic_conn.first]) != sigmap(lut_dlogic.second->getPort(dlogic_conn.second)))
{
log_debug(" LUT has illegal connection to %s cell %s.%s.\n", lut_dlogic->type.c_str(), log_id(module), log_id(lut_dlogic));
log_debug(" LUT input A[%d] (wire %s) not connected to %s port %s (wire %s).\n", dlogic_conn.first, log_signal(lut_input[dlogic_conn.first]), lut_dlogic->type.c_str(), dlogic_conn.second.c_str(), log_signal(lut_dlogic->getPort(dlogic_conn.second)));
log_debug(" LUT has illegal connection to %s cell %s.%s.\n", lut_dlogic.second->type.c_str(), log_id(module), log_id(lut_dlogic.second));
log_debug(" LUT input A[%d] (wire %s) not connected to %s port %s (wire %s).\n", dlogic_conn.first, log_signal(lut_input[dlogic_conn.first]), lut_dlogic.second->type.c_str(), dlogic_conn.second.c_str(), log_signal(lut_dlogic.second->getPort(dlogic_conn.second)));
legal = false;
break;
}
@ -169,7 +174,7 @@ struct OptLutWorker
if (legal)
{
log_debug(" LUT has legal connection to %s cell %s.%s.\n", lut_dlogic->type.c_str(), log_id(module), log_id(lut_dlogic));
log_debug(" LUT has legal connection to %s cell %s.%s.\n", lut_dlogic.second->type.c_str(), log_id(module), log_id(lut_dlogic.second));
lut_legal_dlogics.insert(lut_dlogic);
for (auto &dlogic_conn : dlogic_map)
lut_dlogic_inputs.insert(dlogic_conn.first);
@ -544,7 +549,7 @@ struct OptLutPass : public Pass {
{
log_header(design, "Executing OPT_LUT pass (optimize LUTs).\n");
dict<IdString, dict<int, IdString>> dlogic;
std::vector<dlogic_t> dlogic;
int limit = -1;
size_t argidx;
@ -556,7 +561,8 @@ struct OptLutPass : public Pass {
split(tokens, args[++argidx], ':');
if (tokens.size() < 2)
log_cmd_error("The -dlogic option requires at least one connection.\n");
IdString type = "\\" + tokens[0];
dlogic_t entry;
entry.cell_type = "\\" + tokens[0];
for (auto it = tokens.begin() + 1; it != tokens.end(); ++it) {
std::vector<std::string> conn_tokens;
split(conn_tokens, *it, '=');
@ -564,8 +570,9 @@ struct OptLutPass : public Pass {
log_cmd_error("Invalid format of -dlogic signal mapping.\n");
IdString logic_port = "\\" + conn_tokens[0];
int lut_input = atoi(conn_tokens[1].c_str());
dlogic[type][lut_input] = logic_port;
entry.lut_input_port[lut_input] = logic_port;
}
dlogic.push_back(entry);
continue;
}
if (args[argidx] == "-limit" && argidx + 1 < args.size())

2
techlibs/ice40/synth_ice40.cc
View file

@ -399,7 +399,7 @@ struct SynthIce40Pass : public ScriptPass
run("ice40_wrapcarry -unwrap");
run("techmap -map +/ice40/ff_map.v");
run("clean");
run("opt_lut -dlogic SB_CARRY:I0=1:I1=2:CI=3");
run("opt_lut -dlogic SB_CARRY:I0=1:I1=2:CI=3 -dlogic SB_CARRY:CO=3");
}
if (check_label("map_cells"))

24
tests/arch/ice40/bug2061.ys Normal file
View file

@ -0,0 +1,24 @@
read_verilog <<EOT
module top #(
parameter integer WIDTH = 12
)(
output reg [WIDTH:0] cnt,
input wire clk,
input wire rst
);
wire last_n;
assign last_n = cnt[WIDTH];
always @(posedge clk or posedge rst)
if (rst)
cnt <= 0;
else
cnt <= last_n ? ( cnt + { (WIDTH+1){last_n} } ) : 13'h1aaa;
endmodule
EOT
synth_ice40
splitnets
select -assert-count 12 t:SB_CARRY %co:+[CO] t:SB_LUT4 %ci:+[I3] %i