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detect aliased I/O ports

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This commit is contained in:
N. Engelhardt 2025-01-28 17:37:23 +01:00
parent 9da4fe747e
commit 25b400982b
1 changed files with 12 additions and 11 deletions
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23
techlibs/quicklogic/ql_ioff.cc
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@ -32,38 +32,39 @@ struct QlIoffPass : public Pass {
pool<RTLIL::Cell *> cells_to_replace;
for (auto cell : module->selected_cells()) {
if (cell->type.in(ID(dffsre), ID(sdffsre))) {
log_debug("Checking cell %s.\n", cell->name.c_str());
bool e_const = cell->getPort(ID::E).is_fully_ones();
bool r_const = cell->getPort(ID::R).is_fully_ones();
bool s_const = cell->getPort(ID::S).is_fully_ones();
if (!(e_const && r_const && s_const))
if (!(e_const && r_const && s_const)) {
log_debug("not promoting: E, R, or S is used\n");
continue;
}
SigSpec d = cell->getPort(ID::D);
if (GetSize(d) != 1) continue;
SigBit d_sig = modwalker.sigmap(d[0]);
if (d_sig.is_wire() && d_sig.wire->port_input) {
log_assert(GetSize(d) == 1);
if (modwalker.has_inputs(d)) {
log_debug("Cell %s is potentially eligible for promotion to input IOFF.\n", cell->name.c_str());
// check that d_sig has no other consumers
pool<ModWalker::PortBit> portbits;
modwalker.get_consumers(portbits, d_sig);
modwalker.get_consumers(portbits, d);
if (GetSize(portbits) > 1) {
log_debug("not promoting: d_sig has other consumers\n");
log_debug("not promoting: D has other consumers\n");
continue;
}
cells_to_replace.insert(cell);
continue; // no need to check Q if we already put it on the list
}
SigSpec q = cell->getPort(ID::Q);
if (GetSize(q) != 1) continue;
SigBit q_sig = modwalker.sigmap(q[0]);
if (q_sig.is_wire() && q_sig.wire->port_output) {
log_assert(GetSize(q) == 1);
if (modwalker.has_outputs(q)) {
log_debug("Cell %s is potentially eligible for promotion to output IOFF.\n", cell->name.c_str());
// check that q_sig has no other consumers
pool<ModWalker::PortBit> portbits;
modwalker.get_consumers(portbits, q_sig);
modwalker.get_consumers(portbits, q);
if (GetSize(portbits) > 0) {
log_debug("not promoting: q_sig has other consumers\n");
log_debug("not promoting: Q has other consumers\n");
continue;
}
cells_to_replace.insert(cell);