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abstract: add module input -value abstraction

This commit is contained in:
Emil J. Tywoniak 2025-02-18 17:05:14 +01:00
parent 34e3fcbb31
commit 925c617c52
1 changed files with 43 additions and 2 deletions
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45
passes/cmds/abstract.cc
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@ -212,7 +212,7 @@ unsigned int abstract_state(Module* mod, EnableLogic enable, const std::vector<S
return changed;
}
bool abstract_value_port(Module* mod, Cell* cell, std::set<int> offsets, IdString port_name, EnableLogic enable) {
bool abstract_value_cell_port(Module* mod, Cell* cell, std::set<int> offsets, IdString port_name, EnableLogic enable) {
Wire* to_abstract = mod->addWire(NEW_ID, offsets.size());
SigSpec mux_input;
SigSpec mux_output;
@ -234,6 +234,31 @@ bool abstract_value_port(Module* mod, Cell* cell, std::set<int> offsets, IdStrin
return true;
}
bool abstract_value_mod_port(Module* mod, Wire* wire, std::set<int> offsets, EnableLogic enable) {
Wire* to_abstract = mod->addWire(NEW_ID, wire);
to_abstract->port_input = true;
to_abstract->port_id = wire->port_id;
wire->port_input = false;
wire->port_id = 0;
mod->swap_names(wire, to_abstract);
SigSpec mux_input;
SigSpec mux_output;
SigSpec direct_lhs;
SigSpec direct_rhs;
for (int port_idx = 0; port_idx < wire->width; port_idx++) {
if (offsets.count(port_idx)) {
mux_output.append(SigBit(wire, port_idx));
mux_input.append(SigBit(to_abstract, port_idx));
} else {
direct_lhs.append(SigBit(wire, port_idx));
direct_rhs.append(SigBit(to_abstract, port_idx));
}
}
mod->connections_.push_back(SigSig(direct_lhs, direct_rhs));
emit_mux_anyseq(mod, mux_input, mux_output, enable);
return true;
}
unsigned int abstract_value(Module* mod, EnableLogic enable, const std::vector<Slice> &slices) {
SigMap sigmap(mod);
dict<SigBit, std::vector<SelReason>> selected_reps = gather_selected_reps(mod, slices, sigmap);
@ -254,9 +279,25 @@ unsigned int abstract_value(Module* mod, EnableLogic enable, const std::vector<S
if (offsets_to_abstract.empty())
continue;
changed += abstract_value_port(mod, cell, offsets_to_abstract, conn.first, enable);
changed += abstract_value_cell_port(mod, cell, offsets_to_abstract, conn.first, enable);
}
}
std::vector<Wire*> wires_snapshot = mod->wires();
for (auto wire : wires_snapshot)
if (wire->port_input) {
std::set<int> offsets_to_abstract;
for (auto bit : SigSpec(wire))
if (selected_reps.count(sigmap(bit))) {
log_debug("Abstracting value for module input port bit %s in module %s due to selections:\n",
log_signal(bit), log_id(mod));
explain_selections(selected_reps.at(sigmap(bit)));
offsets_to_abstract.insert(bit.offset);
}
if (offsets_to_abstract.empty())
continue;
changed += abstract_value_mod_port(mod, wire, offsets_to_abstract, enable);
}
return changed;
}