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Merge branch 'master' of github.com:cliffordwolf/yosys

This commit is contained in:
Clifford Wolf 2017-09-01 12:35:09 +02:00
parent 307dc55d65 c9a4feba6a
commit 18609f3df8
5 changed files with 246 additions and 109 deletions
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1
passes/techmap/Makefile.inc
View File

@ -17,6 +17,7 @@ OBJS += passes/techmap/iopadmap.o
OBJS += passes/techmap/hilomap.o
OBJS += passes/techmap/extract.o
OBJS += passes/techmap/extract_fa.o
OBJS += passes/techmap/extract_counter.o
OBJS += passes/techmap/extract_reduce.o
OBJS += passes/techmap/alumacc.o
OBJS += passes/techmap/dff2dffe.o

283
techlibs/greenpak4/greenpak4_counters.cc → passes/techmap/extract_counter.cc
View File

@ -103,15 +103,22 @@ struct CounterExtraction
};
//attempt to extract a counter centered on the given adder cell
int greenpak4_counters_tryextract(ModIndex& index, Cell *cell, CounterExtraction& extract)
//For now we only support DOWN counters.
//TODO: up/down support
int counter_tryextract(
ModIndex& index,
Cell *cell,
CounterExtraction& extract,
pool<RTLIL::IdString>& parallel_cells,
int maxwidth)
{
SigMap& sigmap = index.sigmap;
//GreenPak does not support counters larger than 14 bits so immediately skip anything bigger
//TODO: infer cascaded counters?
//A counter with less than 2 bits makes no sense
//TODO: configurable min threshold
int a_width = cell->getParam("\\A_WIDTH").as_int();
extract.width = a_width;
if(a_width > 14)
if( (a_width < 2) || (a_width > maxwidth) )
return 1;
//Second input must be a single bit
@ -221,40 +228,43 @@ int greenpak4_counters_tryextract(ModIndex& index, Cell *cell, CounterExtraction
pool<Cell*> cnout_loads = get_other_cells(cnout, index, count_reg);
if(cnout_loads.size() > 2)
{
//It's OK to have other loads iff they go to a DAC or DCMP (these are POUT)
for(auto c : cnout_loads)
//If we specified a limited set of cells for parallel output, check that we only drive them
if(!parallel_cells.empty())
{
if(c == underflow_inv)
continue;
if(c == cell)
continue;
//If the cell is not a DAC or DCMP, complain
if( (c->type != "\\GP_DCMP") && (c->type != "\\GP_DAC") )
return 17;
//Figure out what port(s) are driven by it
//TODO: this can probably be done more efficiently w/o multiple iterations over our whole net?
RTLIL::IdString portname;
for(auto b : qport)
for(auto c : cnout_loads)
{
pool<ModIndex::PortInfo> ports = index.query_ports(b);
for(auto x : ports)
if(c == underflow_inv)
continue;
if(c == cell)
continue;
//Make sure we're in the whitelist
if( parallel_cells.find(c->type) == parallel_cells.end())
return 17;
//Figure out what port(s) are driven by it
//TODO: this can probably be done more efficiently w/o multiple iterations over our whole net?
RTLIL::IdString portname;
for(auto b : qport)
{
if(x.cell != c)
continue;
if(portname == "")
portname = x.port;
pool<ModIndex::PortInfo> ports = index.query_ports(b);
for(auto x : ports)
{
if(x.cell != c)
continue;
if(portname == "")
portname = x.port;
//somehow our counter output is going to multiple ports
//this makes no sense, don't allow inference
else if(portname != x.port)
return 17;
//somehow our counter output is going to multiple ports
//this makes no sense, don't allow inference
else if(portname != x.port)
return 17;
}
}
}
//Save the other loads
extract.pouts.insert(ModIndex::PortInfo(c, portname, 0));
//Save the other loads
extract.pouts.insert(ModIndex::PortInfo(c, portname, 0));
}
}
}
if(!is_full_bus(cnout, index, count_reg, "\\Q", underflow_inv, "\\A", true))
@ -276,12 +286,14 @@ int greenpak4_counters_tryextract(ModIndex& index, Cell *cell, CounterExtraction
return 0;
}
void greenpak4_counters_worker(
void counter_worker(
ModIndex& index,
Cell *cell,
unsigned int& total_counters,
pool<Cell*>& cells_to_remove,
pool<pair<Cell*, string>>& cells_to_rename)
pool<pair<Cell*, string>>& cells_to_rename,
pool<RTLIL::IdString>& parallel_cells,
int maxwidth)
{
SigMap& sigmap = index.sigmap;
@ -328,7 +340,7 @@ void greenpak4_counters_worker(
//Attempt to extract a counter
CounterExtraction extract;
int reason = greenpak4_counters_tryextract(index, cell, extract);
int reason = counter_tryextract(index, cell, extract, parallel_cells, maxwidth);
//Nonzero code - we could not find a matchable counter.
//Do nothing, unless extraction was forced in which case give an error
@ -337,7 +349,7 @@ void greenpak4_counters_worker(
static const char* reasons[24]=
{
"no problem", //0
"counter is larger than 14 bits", //1
"counter is too large/small", //1
"counter does not count by one", //2
"counter uses signed math", //3
"counter does not count by one", //4
@ -353,7 +365,7 @@ void greenpak4_counters_worker(
"Mux output is used outside counter", //14
"Counter reg is not DFF/ADFF", //15
"Counter input is not full bus", //16
"Count register is used outside counter, but not by a DCMP or DAC", //17
"Count register is used outside counter, but not by an allowed cell", //17
"Register output is not full bus", //18
"Register output is not full bus", //19
"No init value found", //20
@ -372,13 +384,71 @@ void greenpak4_counters_worker(
return;
}
//Figure out the final cell type based on the counter size
string celltype = "\\GP_COUNT8";
if(extract.width > 8)
celltype = "\\GP_COUNT14";
//Get new cell name
string countname = string("$auto$GP_COUNTx$") + log_id(extract.rwire->name.str());
string countname = string("$COUNTx$") + log_id(extract.rwire->name.str());
//Wipe all of the old connections to the ALU
cell->unsetPort("\\A");
cell->unsetPort("\\B");
cell->unsetPort("\\BI");
cell->unsetPort("\\CI");
cell->unsetPort("\\CO");
cell->unsetPort("\\X");
cell->unsetPort("\\Y");
cell->unsetParam("\\A_SIGNED");
cell->unsetParam("\\A_WIDTH");
cell->unsetParam("\\B_SIGNED");
cell->unsetParam("\\B_WIDTH");
cell->unsetParam("\\Y_WIDTH");
//Change the cell type
cell->type = "$__COUNT_";
//Hook up resets
if(extract.has_reset)
{
//TODO: support other kinds of reset
cell->setParam("\\RESET_MODE", RTLIL::Const("LEVEL"));
cell->setPort("\\RST", extract.rst);
}
else
{
cell->setParam("\\RESET_MODE", RTLIL::Const("RISING"));
cell->setPort("\\RST", RTLIL::SigSpec(false));
}
//Hook up other stuff
//cell->setParam("\\CLKIN_DIVIDE", RTLIL::Const(1));
cell->setParam("\\COUNT_TO", RTLIL::Const(extract.count_value));
cell->setParam("\\WIDTH", RTLIL::Const(extract.width));
cell->setPort("\\CLK", extract.clk);
cell->setPort("\\OUT", extract.outsig);
//Hook up hard-wired ports (for now CE and up/=down are not supported), default to no parallel output
cell->setParam("\\HAS_POUT", RTLIL::Const(0));
cell->setParam("\\HAS_CE", RTLIL::Const(0));
cell->setParam("\\DIRECTION", RTLIL::Const("DOWN"));
cell->setPort("\\CE", RTLIL::Const(1));
cell->setPort("\\UP", RTLIL::Const(1));
//Hook up any parallel outputs
for(auto load : extract.pouts)
{
log(" Counter has parallel output to cell %s port %s\n", log_id(load.cell->name), log_id(load.port));
//Find the wire hooked to the old port
auto sig = load.cell->getPort(load.port);
//Connect it to our parallel output
//(this is OK to do more than once b/c they all go to the same place)
cell->setPort("\\POUT", sig);
cell->setParam("\\HAS_POUT", RTLIL::Const(1));
}
//Delete the cells we've replaced (let opt_clean handle deleting the now-redundant wires)
cells_to_remove.insert(extract.count_mux);
cells_to_remove.insert(extract.count_reg);
cells_to_remove.insert(extract.underflow_inv);
//Log it
total_counters ++;
@ -396,88 +466,87 @@ void greenpak4_counters_worker(
log_id(extract.rwire->name),
count_reg_src.c_str());
//Wipe all of the old connections to the ALU
cell->unsetPort("\\A");
cell->unsetPort("\\B");
cell->unsetPort("\\BI");
cell->unsetPort("\\CI");
cell->unsetPort("\\CO");
cell->unsetPort("\\X");
cell->unsetPort("\\Y");
cell->unsetParam("\\A_SIGNED");
cell->unsetParam("\\A_WIDTH");
cell->unsetParam("\\B_SIGNED");
cell->unsetParam("\\B_WIDTH");
cell->unsetParam("\\Y_WIDTH");
//Change the cell type
cell->type = celltype;
//Hook up resets
if(extract.has_reset)
//Optimize the counter
//If we have no parallel output, and we have redundant bits, shrink us
if(extract.pouts.empty())
{
//TODO: support other kinds of reset
cell->setParam("\\RESET_MODE", RTLIL::Const("LEVEL"));
cell->setPort("\\RST", extract.rst);
//TODO: Need to update this when we add support for counters with nonzero reset values
//to make sure the reset value fits in our bit space too
//Optimize it
int newbits = ceil(log2(extract.count_value));
if(extract.width != newbits)
{
cell->setParam("\\WIDTH", RTLIL::Const(newbits));
log(" Optimizing out %d unused high-order bits (new width is %d)\n",
extract.width - newbits,
newbits);
}
}
else
{
cell->setParam("\\RESET_MODE", RTLIL::Const("RISING"));
cell->setPort("\\RST", RTLIL::SigSpec(false));
}
//Hook up other stuff
cell->setParam("\\CLKIN_DIVIDE", RTLIL::Const(1));
cell->setParam("\\COUNT_TO", RTLIL::Const(extract.count_value));
cell->setPort("\\CLK", extract.clk);
cell->setPort("\\OUT", extract.outsig);
//Hook up any parallel outputs
for(auto load : extract.pouts)
{
log(" Counter has parallel output to cell %s port %s\n", log_id(load.cell->name), log_id(load.port));
//Find the wire hooked to the old port
auto sig = load.cell->getPort(load.port);
//Connect it to our parallel output
//(this is OK to do more than once b/c they all go to the same place)
cell->setPort("\\POUT", sig);
}
//Delete the cells we've replaced (let opt_clean handle deleting the now-redundant wires)
cells_to_remove.insert(extract.count_mux);
cells_to_remove.insert(extract.count_reg);
cells_to_remove.insert(extract.underflow_inv);
//Finally, rename the cell
cells_to_rename.insert(pair<Cell*, string>(cell, countname));
}
struct Greenpak4CountersPass : public Pass {
Greenpak4CountersPass() : Pass("greenpak4_counters", "Extract GreenPak4 counter cells") { }
struct ExtractCounterPass : public Pass {
ExtractCounterPass() : Pass("extract_counter", "Extract GreenPak4 counter cells") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" greenpak4_counters [options] [selection]\n");
log(" extract_counter [options] [selection]\n");
log("\n");
log("This pass converts non-resettable or async resettable down counters to\n");
log("counter cells. Use a target-specific 'techmap' map file to convert those cells\n");
log("to the actual target cells.\n");
log("\n");
log(" -maxwidth N\n");
log(" Only extract counters up to N bits wide\n");
log("\n");
log(" -pout X,Y,...\n");
log(" Only allow parallel output from the counter to the listed cell types\n");
log(" (if not specified, parallel outputs are not restricted)\n");
log("\n");
log("This pass converts non-resettable or async resettable down counters to GreenPak4\n");
log("counter cells (All other GreenPak4 counter modes must be instantiated manually.)\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
log_header(design, "Executing GREENPAK4_COUNTERS pass (mapping counters to hard IP blocks).\n");
log_header(design, "Executing EXTRACT_COUNTER pass (find counters in netlist).\n");
int maxwidth = 64;
size_t argidx;
pool<RTLIL::IdString> parallel_cells;
for (argidx = 1; argidx < args.size(); argidx++)
{
// if (args[argidx] == "-v") {
// continue;
// }
break;
if (args[argidx] == "-pout")
{
if(argidx + 1 >= args.size())
{
log_error("extract_counter -pout requires an argument\n");
return;
}
std::string pouts = args[++argidx];
std::string tmp;
for(size_t i=0; i<pouts.length(); i++)
{
if(pouts[i] == ',')
{
parallel_cells.insert(RTLIL::escape_id(tmp));
tmp = "";
}
else
tmp += pouts[i];
}
parallel_cells.insert(RTLIL::escape_id(tmp));
continue;
}
if (args[argidx] == "-maxwidth" && argidx+1 < args.size())
{
maxwidth = atoi(args[++argidx].c_str());
continue;
}
}
extra_args(args, argidx, design);
@ -490,7 +559,7 @@ struct Greenpak4CountersPass : public Pass {
ModIndex index(module);
for (auto cell : module->selected_cells())
greenpak4_counters_worker(index, cell, total_counters, cells_to_remove, cells_to_rename);
counter_worker(index, cell, total_counters, cells_to_remove, cells_to_rename, parallel_cells, maxwidth);
for(auto cell : cells_to_remove)
{
@ -508,6 +577,6 @@ struct Greenpak4CountersPass : public Pass {
if(total_counters)
log("Extracted %u counters\n", total_counters);
}
} Greenpak4CountersPass;
} ExtractCounterPass;
PRIVATE_NAMESPACE_END

1
techlibs/greenpak4/Makefile.inc
View File

@ -1,6 +1,5 @@
OBJS += techlibs/greenpak4/synth_greenpak4.o
OBJS += techlibs/greenpak4/greenpak4_counters.o
OBJS += techlibs/greenpak4/greenpak4_dffinv.o
$(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/cells_latch.v))

68
techlibs/greenpak4/cells_map.v
View File

@ -144,3 +144,71 @@ module \$lut (A, Y);
end
endgenerate
endmodule
module \$__COUNT_ (CE, CLK, OUT, POUT, RST, UP);
input wire CE;
input wire CLK;
output reg OUT;
output reg[WIDTH-1:0] POUT;
input wire RST;
input wire UP;
parameter COUNT_TO = 1;
parameter RESET_MODE = "RISING";
parameter HAS_POUT = 0;
parameter HAS_CE = 0;
parameter WIDTH = 8;
parameter DIRECTION = "DOWN";
//If we have a CE, or DIRECTION other than DOWN fail... GP_COUNTx_ADV is not supported yet
if(HAS_CE || (DIRECTION != "DOWN") ) begin
initial begin
$display("ERROR: \$__COUNT_ support for GP_COUNTx_ADV is not yet implemented. This counter should never have been extracted (bug in extract_counter pass?).");
$finish;
end
end
//If counter is more than 14 bits wide, complain (also shouldn't happen)
else if(WIDTH > 14) begin
initial begin
$display("ERROR: \$__COUNT_ support for cascaded counters is not yet implemented. This counter should never have been extracted (bug in extract_counter pass?).");
$finish;
end
end
//If counter is more than 8 bits wide and has parallel output, we have a problem
else if(WIDTH > 8 && HAS_POUT) begin
initial begin
$display("ERROR: \$__COUNT_ support for 9-14 bit counters with parallel output is not yet implemented. This counter should never have been extracted (bug in extract_counter pass?).");
$finish;
end
end
//Looks like a legal counter! Do something with it
else if(WIDTH <= 8) begin
GP_COUNT8 #(
.COUNT_TO(COUNT_TO),
.RESET_MODE(RESET_MODE),
.CLKIN_DIVIDE(1)
) _TECHMAP_REPLACE_ (
.CLK(CLK),
.RST(RST),
.OUT(OUT),
.POUT(POUT)
);
end
else begin
GP_COUNT14 #(
.COUNT_TO(COUNT_TO),
.RESET_MODE(RESET_MODE),
.CLKIN_DIVIDE(1)
) _TECHMAP_REPLACE_ (
.CLK(CLK),
.RST(RST),
.OUT(OUT)
);
end
endmodule

2
techlibs/greenpak4/synth_greenpak4.cc
View File

@ -155,7 +155,7 @@ struct SynthGreenPAK4Pass : public ScriptPass
if (check_label("fine"))
{
run("greenpak4_counters");
run("extract_counter -pout GP_DCMP,GP_DAC -maxwidth 14");
run("clean");
run("opt -fast -mux_undef -undriven -fine");
run("memory_map");