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authorClifford Wolf <clifford@clifford.at>2014-01-03 14:01:06 +0100
committerClifford Wolf <clifford@clifford.at>2014-01-03 14:01:06 +0100
commit60fbca9970e1b92d61642b86d2a3170b5b33ad6f (patch)
treef1ffaf7b2af8127b2d8faf8847bd24bf5bc9bfe7 /passes
parentbf5e5429c19af5ab92c30a0c7ca99408cd1f3dde (diff)
Added "splitnets -driver"
Diffstat (limited to 'passes')
-rw-r--r--passes/cmds/splitnets.cc125
1 files changed, 96 insertions, 29 deletions
diff --git a/passes/cmds/splitnets.cc b/passes/cmds/splitnets.cc
index 628e87db..68e1edd1 100644
--- a/passes/cmds/splitnets.cc
+++ b/passes/cmds/splitnets.cc
@@ -24,16 +24,48 @@
struct SplitnetsWorker
{
- std::map<RTLIL::Wire*, std::vector<RTLIL::Wire*>> splitmap;
+ std::map<RTLIL::Wire*, std::vector<RTLIL::SigBit>> splitmap;
+
+ void append_wire(RTLIL::Module *module, RTLIL::Wire *wire, int offset, int width, std::string format)
+ {
+ RTLIL::Wire *new_wire = new RTLIL::Wire;
+
+ new_wire->port_id = wire->port_id;
+ new_wire->port_input = wire->port_input;
+ new_wire->port_output = wire->port_output;
+ new_wire->name = wire->name;
+ new_wire->width = width;
+
+ if (format.size() > 0)
+ new_wire->name += format.substr(0, 1);
+
+ if (width > 1) {
+ new_wire->name += stringf("%d", offset+width-1);
+ if (format.size() > 2)
+ new_wire->name += format.substr(2, 1);
+ else
+ new_wire->name += ":";
+ }
+
+ new_wire->name += stringf("%d", offset);
+
+ if (format.size() > 1)
+ new_wire->name += format.substr(1, 1);
+
+ while (module->count_id(new_wire->name) > 0)
+ new_wire->name = new_wire->name + "_";
+ module->add(new_wire);
+
+ std::vector<RTLIL::SigBit> sigvec = RTLIL::SigSpec(new_wire).to_sigbit_vector();
+ splitmap[wire].insert(splitmap[wire].end(), sigvec.begin(), sigvec.end());
+ }
void operator()(RTLIL::SigSpec &sig)
{
sig.expand();
for (auto &c : sig.chunks)
- if (splitmap.count(c.wire) > 0) {
- c.wire = splitmap.at(c.wire).at(c.offset);
- c.offset = 0;
- }
+ if (splitmap.count(c.wire) > 0)
+ c = splitmap.at(c.wire).at(c.offset);
sig.optimize();
}
};
@@ -48,19 +80,25 @@ struct SplitnetsPass : public Pass {
log("\n");
log("This command splits multi-bit nets into single-bit nets.\n");
log("\n");
- log(" -format char1[char2]\n");
+ log(" -format char1[char2[char3]]\n");
log(" the first char is inserted between the net name and the bit index, the\n");
log(" second char is appended to the netname. e.g. -format () creates net\n");
- log(" names like 'mysignal(42)'. the default is '[]'.\n");
+ log(" names like 'mysignal(42)'. the 3rd character is the range seperation\n");
+ log(" character when creating multi-bit wires. the default is '[]:'.\n");
log("\n");
log(" -ports\n");
log(" also split module ports. per default only internal signals are split.\n");
log("\n");
+ log(" -driver\n");
+ log(" don't blindly split nets in individual bits. instead look at the driver\n");
+ log(" and split nets so that no driver drives only part of a net.\n");
+ log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
bool flag_ports = false;
- std::string format = "[]";
+ bool flag_driver = false;
+ std::string format = "[]:";
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
@@ -73,6 +111,10 @@ struct SplitnetsPass : public Pass {
flag_ports = true;
continue;
}
+ if (args[argidx] == "-driver") {
+ flag_driver = true;
+ continue;
+ }
break;
}
extra_args(args, argidx, design);
@@ -85,30 +127,55 @@ struct SplitnetsPass : public Pass {
SplitnetsWorker worker;
- for (auto &w : module->wires) {
- RTLIL::Wire *wire = w.second;
- if (wire->width > 1 && (wire->port_id == 0 || flag_ports))
- worker.splitmap[wire] = std::vector<RTLIL::Wire*>();
- }
+ if (flag_driver)
+ {
+ CellTypes ct(design);
+
+ std::map<RTLIL::Wire*, std::set<int>> split_wires_at;
+
+ for (auto &c : module->cells)
+ for (auto &p : c.second->connections)
+ {
+ if (!ct.cell_known(c.second->type))
+ continue;
+ if (!ct.cell_output(c.second->type, p.first))
+ continue;
- for (auto &it : worker.splitmap)
- for (int i = 0; i < it.first->width; i++) {
- RTLIL::Wire *wire = new RTLIL::Wire;
- wire->port_id = it.first->port_id;
- wire->port_input = it.first->port_input;
- wire->port_output = it.first->port_output;
- wire->name = it.first->name;
- if (format.size() > 0)
- wire->name += format.substr(0, 1);
- wire->name += stringf("%d", i);
- if (format.size() > 0)
- wire->name += format.substr(1);
- while (module->count_id(wire->name) > 0)
- wire->name = wire->name + "_";
- module->add(wire);
- it.second.push_back(wire);
+ RTLIL::SigSpec sig = p.second.optimized();
+ for (auto &chunk : sig.chunks) {
+ if (chunk.wire == NULL)
+ continue;
+ if (chunk.wire->port_id == 0 || flag_ports) {
+ if (chunk.offset != 0)
+ split_wires_at[chunk.wire].insert(chunk.offset);
+ if (chunk.offset + chunk.width < chunk.wire->width)
+ split_wires_at[chunk.wire].insert(chunk.offset + chunk.width);
+ }
+ }
}
+ for (auto &it : split_wires_at) {
+ int cursor = 0;
+ for (int next_cursor : it.second) {
+ worker.append_wire(module, it.first, cursor, next_cursor - cursor, format);
+ cursor = next_cursor;
+ }
+ worker.append_wire(module, it.first, cursor, it.first->width - cursor, format);
+ }
+ }
+ else
+ {
+ for (auto &w : module->wires) {
+ RTLIL::Wire *wire = w.second;
+ if (wire->width > 1 && (wire->port_id == 0 || flag_ports))
+ worker.splitmap[wire] = std::vector<RTLIL::SigBit>();
+ }
+
+ for (auto &it : worker.splitmap)
+ for (int i = 0; i < it.first->width; i++)
+ worker.append_wire(module, it.first, i, 1, format);
+ }
+
module->rewrite_sigspecs(worker);
for (auto &it : worker.splitmap) {