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opt_clean: xbit drivers for all

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This commit is contained in:
Emil J. Tywoniak 2025-04-10 00:37:58 +02:00
parent 0c689091e2
commit 8b6602460c
1 changed files with 28 additions and 3 deletions
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31
passes/opt/opt_clean.cc
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@ -267,8 +267,8 @@ bool compare_signals(RTLIL::SigBit &s1, RTLIL::SigBit &s2, SigPool &regs, SigPoo
return regs.check(s2);
if (direct_wires.count(w1) != direct_wires.count(w2))
return direct_wires.count(w2) != 0;
if (conns.check_any(s1) != conns.check_any(s2))
return conns.check_any(s2);
if (conns.check(s1) != conns.check(s2))
return conns.check(s2);
}
if (w1->port_output != w2->port_output)
@ -304,6 +304,7 @@ bool rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool verbos
// on picking representatives out of groups of connected signals
SigPool register_signals;
SigPool connected_signals;
std::vector<SigSpec> maybe_driven_signals;
if (!purge_mode)
for (auto &it : module->cells_) {
RTLIL::Cell *cell = it.second;
@ -313,12 +314,36 @@ bool rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool verbos
if (clk2fflogic ? it2.first == ID::D : ct_reg.cell_output(cell->type, it2.first))
register_signals.add(it2.second);
}
for (auto &it2 : cell->connections())
for (auto &it2 : cell->connections()) {
connected_signals.add(it2.second);
if (!ct_all.cell_known(cell->type) || ct_all.cell_output(cell->type, it2.first))
maybe_driven_signals.push_back(it2.second);
}
}
SigMap assign_map(module);
SigPool maybe_driven_signals_bits;
for (auto sig : maybe_driven_signals) {
for (auto bit : sig) {
maybe_driven_signals_bits.add(assign_map(bit));
}
}
for (auto &it : module->wires_) {
RTLIL::SigSpec sig = it.second;
if (it.second->port_id != 0) {
maybe_driven_signals_bits.add(assign_map(sig));
}
}
for (auto &it : module->wires_) {
RTLIL::SigSpec sig = it.second;
for (auto bit : sig) {
if (!maybe_driven_signals_bits.check(assign_map(bit))) {
log("add conn %s <-> %s to assign_map\n", log_signal(bit), log_signal(SigBit(State::Sx)));
assign_map.add(bit, SigBit(State::Sx));
}
}
}
// construct a pool of wires which are directly driven by a known celltype,
// this will influence our choice of representatives
pool<RTLIL::Wire*> direct_wires;