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Add -blast mode to splitcells

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This commit is contained in:
Akash Levy 2024-12-17 14:18:32 -08:00
parent 1eee11846e
commit 8751c7a028
1 changed files with 12 additions and 4 deletions
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16
passes/cmds/splitcells.cc
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@ -66,7 +66,7 @@ struct SplitcellsWorker
} }
} }
int split(Cell *cell, const std::string &format, int limit) int split(Cell *cell, const std::string &format, int limit, bool blast = false)
{ {
if (cell->type.in("$and", "$mux", "$not", "$or", "$pmux", "$xnor", "$xor")) if (cell->type.in("$and", "$mux", "$not", "$or", "$pmux", "$xnor", "$xor"))
{ {
@ -84,7 +84,7 @@ struct SplitcellsWorker
for (int i = 1; i < width; i++) { for (int i = 1; i < width; i++) {
auto &last_users = bit_users_db[outsig[slices.back()]]; auto &last_users = bit_users_db[outsig[slices.back()]];
auto &this_users = bit_users_db[outsig[i]]; auto &this_users = bit_users_db[outsig[i]];
if (last_users != this_users) slices.push_back(i); if ((last_users != this_users) || blast) 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 if (limit != -1 && GetSize(slices) > limit) { // skip if number of slices is above limit
@ -154,7 +154,7 @@ struct SplitcellsWorker
for (int i = 1; i < width; i++) { for (int i = 1; i < width; i++) {
auto &last_users = bit_users_db[outsig[slices.back()]]; auto &last_users = bit_users_db[outsig[slices.back()]];
auto &this_users = bit_users_db[outsig[i]]; auto &this_users = bit_users_db[outsig[i]];
if (last_users != this_users) slices.push_back(i); if ((last_users != this_users) || blast) slices.push_back(i);
} }
if (GetSize(slices) <= 1) return 0; if (GetSize(slices) <= 1) return 0;
@ -228,11 +228,15 @@ struct SplitcellsPass : public Pass {
log(" -limit n\n"); log(" -limit n\n");
log(" max number of slices to split.\n"); log(" max number of slices to split.\n");
log("\n"); log("\n");
log(" -blast\n");
log(" blast all bits (do not look at usage of the cell output bits).\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; int limit = -1;
bool blast = false;
log_header(design, "Executing SPLITCELLS pass (splitting up multi-bit cells).\n"); log_header(design, "Executing SPLITCELLS pass (splitting up multi-bit cells).\n");
@ -247,6 +251,10 @@ struct SplitcellsPass : public Pass {
limit = std::stoi(args[++argidx]); limit = std::stoi(args[++argidx]);
continue; continue;
} }
if (args[argidx] == "-blast" && argidx+1 < args.size()) {
blast = true;
continue;
}
break; break;
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);
@ -264,7 +272,7 @@ 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, limit); int n = worker.split(cell, format, limit, blast);
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;