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Improve unused-detection for opt_clean driver-driver conflict warning 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-05-03 09:12:10 +02:00
parent e5cb9435a0
commit f12e1155f1
1 changed files with 29 additions and 21 deletions
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50
passes/opt/opt_clean.cc
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@ -97,21 +97,19 @@ void rmunused_module_cells(Module *module, bool verbose)
for (auto &it : module->cells_) {
Cell *cell = it.second;
for (auto &it2 : cell->connections()) {
if (!ct_all.cell_known(cell->type) || ct_all.cell_output(cell->type, it2.first))
for (auto raw_bit : it2.second) {
if (raw_bit.wire == nullptr)
continue;
auto bit = sigmap(raw_bit);
if (bit.wire == nullptr)
driver_driver_logs[raw_bit].push_back(stringf("Driver-driver conflict "
"for %s between cell %s.%s and constant %s in %s: Resolved using constant.",
log_signal(raw_bit), log_id(cell), log_id(it2.first), log_signal(bit), log_id(module)));
if (bit.wire != nullptr)
wire2driver[bit].insert(cell);
}
if (!ct_all.cell_known(cell->type) || ct_all.cell_input(cell->type, it2.first))
for (auto raw_bit : it2.second)
used_raw_bits.insert(raw_bit);
if (ct_all.cell_known(cell->type) && !ct_all.cell_output(cell->type, it2.first))
continue;
for (auto raw_bit : it2.second) {
if (raw_bit.wire == nullptr)
continue;
auto bit = sigmap(raw_bit);
if (bit.wire == nullptr)
driver_driver_logs[raw_bit].push_back(stringf("Driver-driver conflict "
"for %s between cell %s.%s and constant %s in %s: Resolved using constant.",
log_signal(raw_bit), log_id(cell), log_id(it2.first), log_signal(bit), log_id(module)));
if (bit.wire != nullptr)
wire2driver[bit].insert(cell);
}
}
if (keep_cache.query(cell))
queue.insert(cell);
@ -130,12 +128,6 @@ void rmunused_module_cells(Module *module, bool verbose)
}
}
for (auto it : driver_driver_logs) {
if (used_raw_bits.count(it.first))
for (auto msg : it.second)
log_warning("%s\n", msg.c_str());
}
while (!queue.empty())
{
pool<SigBit> bits;
@ -161,6 +153,22 @@ void rmunused_module_cells(Module *module, bool verbose)
module->remove(cell);
count_rm_cells++;
}
for (auto &it : module->cells_) {
Cell *cell = it.second;
for (auto &it2 : cell->connections()) {
if (ct_all.cell_known(cell->type) && !ct_all.cell_input(cell->type, it2.first))
continue;
for (auto raw_bit : it2.second)
used_raw_bits.insert(raw_bit);
}
}
for (auto it : driver_driver_logs) {
if (used_raw_bits.count(it.first))
for (auto msg : it.second)
log_warning("%s\n", msg.c_str());
}
}
int count_nontrivial_wire_attrs(RTLIL::Wire *w)