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abc9: break SCC by setting (* keep *) on output wires

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This commit is contained in:
Eddie Hung 2020-01-13 21:45:27 -08:00
parent a2c4d98da7
commit 2c65e1abac
4 changed files with 23 additions and 35 deletions
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2
passes/techmap/abc9.cc
View file

@ -298,7 +298,7 @@ struct Abc9Pass : public ScriptPass
num_outputs);
if (num_outputs) {
run(stringf("%s -cwd %s", exe_cmd.str().c_str(), tempdir_name.c_str()));
run(stringf("read_aiger -xaiger -wideports -module_name %s$abc9 -map %s/input.sym %s/output.aig", log_id(mod->name), tempdir_name.c_str(), tempdir_name.c_str()));
run(stringf("read_aiger -xaiger -wideports -module_name %s$abc9 -map %s/input.sym %s/output.aig", log_id(mod), tempdir_name.c_str(), tempdir_name.c_str()));
run("abc9_ops -reintegrate");
}
else

29
passes/techmap/abc9_ops.cc
View file

@ -53,30 +53,7 @@ void break_scc(RTLIL::Module *module)
if (cell->output(c.first)) {
SigBit b = c.second.as_bit();
Wire *w = b.wire;
if (w->port_input) {
// In this case, hopefully the loop break has been already created
// Get the non-prefixed wire
Wire *wo = module->wire(stringf("%s.abco", b.wire->name.c_str()));
log_assert(wo != nullptr);
log_assert(wo->port_output);
log_assert(b.offset < GetSize(wo));
c.second = RTLIL::SigBit(wo, b.offset);
}
else {
// Create a new output/input loop break
w->port_input = true;
w = module->wire(stringf("%s.abco", w->name.c_str()));
if (!w) {
w = module->addWire(stringf("%s.abco", b.wire->name.c_str()), GetSize(b.wire));
w->port_output = true;
}
else {
log_assert(w->port_input);
log_assert(b.offset < GetSize(w));
}
w->set_bool_attribute(ID(abc9_scc_break));
c.second = RTLIL::SigBit(w, b.offset);
}
w->set_bool_attribute(ID::keep);
}
}
}
@ -586,7 +563,9 @@ void reintegrate(RTLIL::Module *module)
}
if (cell->output(mapped_conn.first))
for (auto i : mapped_conn.second)
bit_drivers[i].insert(mapped_cell->name);
// Ignore inouts for topo ordering
if (i.wire && !(i.wire->port_input && i.wire->port_output))
bit_drivers[i].insert(mapped_cell->name);
}
}
else {