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Add slice count limit option to splitcells

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This commit is contained in:
Akash Levy 2024-11-05 04:13:58 -08:00
parent 72f511ae29
commit 925741bf09
1 changed files with 18 additions and 2 deletions
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20
passes/cmds/splitcells.cc
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@ -66,7 +66,7 @@ struct SplitcellsWorker
} }
} }
int split(Cell *cell, const std::string &format) int split(Cell *cell, const std::string &format, int limit)
{ {
if (cell->type.in("$and", "$mux", "$not", "$or", "$pmux", "$xnor", "$xor")) if (cell->type.in("$and", "$mux", "$not", "$or", "$pmux", "$xnor", "$xor"))
{ {
@ -87,6 +87,10 @@ struct SplitcellsWorker
if (last_users != this_users) slices.push_back(i); if (last_users != this_users) slices.push_back(i);
} }
if (GetSize(slices) <= 1) return 0; if (GetSize(slices) <= 1) return 0;
if (limit != -1 && GetSize(slices) > limit) { // skip if number of slices is above limit
log("Skipping %s cell %s/%s with high slice count %d.\n", log_id(cell->type), log_id(module), log_id(cell), GetSize(slices));
return 0;
}
slices.push_back(GetSize(outsig)); slices.push_back(GetSize(outsig));
log("Splitting %s cell %s/%s into %d slices:\n", log_id(cell->type), log_id(module), log_id(cell), GetSize(slices)-1); log("Splitting %s cell %s/%s into %d slices:\n", log_id(cell->type), log_id(module), log_id(cell), GetSize(slices)-1);
@ -154,6 +158,10 @@ struct SplitcellsWorker
} }
if (GetSize(slices) <= 1) return 0; if (GetSize(slices) <= 1) return 0;
if (limit != -1 && GetSize(slices) > limit) { // skip if number of slices is above limit
log("Skipping %s cell %s/%s with high slice count %d.\n", log_id(cell->type), log_id(module), log_id(cell), GetSize(slices));
return 0;
}
slices.push_back(GetSize(outsig)); slices.push_back(GetSize(outsig));
log("Splitting %s cell %s/%s into %d slices:\n", log_id(cell->type), log_id(module), log_id(cell), GetSize(slices)-1); log("Splitting %s cell %s/%s into %d slices:\n", log_id(cell->type), log_id(module), log_id(cell), GetSize(slices)-1);
@ -217,10 +225,14 @@ struct SplitcellsPass : public Pass {
log(" names like 'mycell(42)'. the 3rd character is the range separation\n"); log(" names like 'mycell(42)'. the 3rd character is the range separation\n");
log(" character when creating multi-bit cells. the default is '[]:'.\n"); log(" character when creating multi-bit cells. the default is '[]:'.\n");
log("\n"); log("\n");
log(" -limit n\n");
log(" max number of slices to split.\n");
log("\n");
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) override void execute(std::vector<std::string> args, RTLIL::Design *design) override
{ {
std::string format; std::string format;
int limit = -1;
log_header(design, "Executing SPLITCELLS pass (splitting up multi-bit cells).\n"); log_header(design, "Executing SPLITCELLS pass (splitting up multi-bit cells).\n");
@ -231,6 +243,10 @@ struct SplitcellsPass : public Pass {
format = args[++argidx]; format = args[++argidx];
continue; continue;
} }
if (args[argidx] == "-limit" && argidx+1 < args.size()) {
limit = std::stoi(args[++argidx]);
continue;
}
break; break;
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);
@ -248,7 +264,7 @@ struct SplitcellsPass : public Pass {
SplitcellsWorker worker(module); SplitcellsWorker worker(module);
bool did_something = false; bool did_something = false;
for (auto cell : module->selected_cells()) { for (auto cell : module->selected_cells()) {
int n = worker.split(cell, format); int n = worker.split(cell, format, limit);
did_something |= (n != 0); did_something |= (n != 0);
count_split_pre += (n != 0); count_split_pre += (n != 0);
count_split_post += n; count_split_post += n;