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Added "scc -expect <N> -nofeedback"

This commit is contained in:
Clifford Wolf 2015-02-10 08:48:55 +01:00
parent adf4ecbc1f
commit 510deb3577
1 changed files with 48 additions and 7 deletions
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55
passes/cmds/scc.cc
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@ -100,7 +100,8 @@ struct SccWorker
}
}
SccWorker(RTLIL::Design *design, RTLIL::Module *module, bool allCellTypes, int maxDepth) : design(design), module(module), sigmap(module)
SccWorker(RTLIL::Design *design, RTLIL::Module *module, bool nofeedbackMode, bool allCellTypes, int maxDepth) :
design(design), module(module), sigmap(module)
{
if (module->processes.size() > 0) {
log("Skipping module %s as it contains processes (run 'proc' pass first).\n", module->name.c_str());
@ -167,11 +168,23 @@ struct SccWorker
labelCounter = 0;
cellLabels.clear();
while (workQueue.size() > 0) {
while (workQueue.size() > 0)
{
RTLIL::Cell *cell = *workQueue.begin();
log_assert(cellStack.size() == 0);
cellDepth.clear();
run(cell, 0, maxDepth);
if (!nofeedbackMode && cellToNextCell[cell].count(cell)) {
log("Found an SCC:");
std::set<RTLIL::Cell*> scc;
log(" %s", RTLIL::id2cstr(cell->name));
cell2scc[cell] = sccList.size();
scc.insert(cell);
sccList.push_back(scc);
workQueue.erase(cell);
log("\n");
} else
run(cell, 0, maxDepth);
}
log("Found %d SCCs in module %s.\n", int(sccList.size()), RTLIL::id2cstr(module->name));
@ -212,10 +225,18 @@ struct SccPass : public Pass {
log("This command identifies strongly connected components (aka logic loops) in the\n");
log("design.\n");
log("\n");
log(" -expect <num>\n");
log(" expect to find exactly <num> SSCs. A different number of SSCs will\n");
log(" produce an error.\n");
log("\n");
log(" -max_depth <num>\n");
log(" limit to loops not longer than the specified number of cells. This can\n");
log(" e.g. be useful in identifying local loops in a module that turns out\n");
log(" to be one gigantic SCC.\n");
log(" limit to loops not longer than the specified number of cells. This\n");
log(" can e.g. be useful in identifying small local loops in a module that\n");
log(" implements one large SCC.\n");
log("\n");
log(" -nofeedback\n");
log(" do not count cells that have their output fed back into one of their\n");
log(" inputs as single-cell scc.\n");
log("\n");
log(" -all_cell_types\n");
log(" Usually this command only considers internal non-memory cells. With\n");
@ -239,7 +260,9 @@ struct SccPass : public Pass {
std::map<std::string, std::string> setCellAttr, setWireAttr;
bool allCellTypes = false;
bool selectMode = false;
bool nofeedbackMode = false;
int maxDepth = -1;
int expect = -1;
log_header("Executing SCC pass (detecting logic loops).\n");
@ -249,6 +272,14 @@ struct SccPass : public Pass {
maxDepth = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-expect" && argidx+1 < args.size()) {
expect = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-nofeedback") {
nofeedbackMode = true;
continue;
}
if (args[argidx] == "-all_cell_types") {
allCellTypes = true;
continue;
@ -282,16 +313,26 @@ struct SccPass : public Pass {
log_cmd_error("The -set*_attr options are not implemented at the moment!\n");
RTLIL::Selection newSelection(false);
int scc_counter = 0;
for (auto &mod_it : design->modules_)
if (design->selected(mod_it.second))
{
SccWorker worker(design, mod_it.second, allCellTypes, maxDepth);
SccWorker worker(design, mod_it.second, nofeedbackMode, allCellTypes, maxDepth);
scc_counter += GetSize(worker.sccList);
if (selectMode)
worker.select(newSelection);
}
if (expect >= 0) {
if (scc_counter == expect)
log("Found and expected %d SCCs.\n", scc_counter);
else
log_error("Found %d SCCs but expected %d.\n", scc_counter, expect);
} else
log("Found %d SCCs.\n", scc_counter);
if (selectMode) {
log_assert(origSelectPos >= 0);
design->selection_stack[origSelectPos] = newSelection;