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Do not re-order carry chain ports, just precompute iteration order

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This commit is contained in:
Eddie Hung 2019-12-31 16:12:40 -08:00
parent 6b825c719b
commit cac7f5d82e
2 changed files with 32 additions and 44 deletions
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22
passes/techmap/abc9.cc
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@ -1003,28 +1003,6 @@ struct Abc9Pass : public Pass {
log_error("Module '%s' contains an 'abc9_carry' input port but no output port.\n", log_id(m));
if (!carry_in && carry_out)
log_error("Module '%s' contains an 'abc9_carry' output port but no input port.\n", log_id(m));
// Make carry_in the last PI, and carry_out the last PO
// since ABC requires it this way
auto &ports = m->ports;
for (auto it = ports.begin(); it != ports.end(); ) {
RTLIL::Wire* w = m->wire(*it);
log_assert(w);
if (w == carry_in || w == carry_out) {
it = ports.erase(it);
continue;
}
if (w->port_id > carry_in->port_id)
--w->port_id;
if (w->port_id > carry_out->port_id)
--w->port_id;
log_assert(w->port_input || w->port_output);
log_assert(ports[w->port_id-1] == w->name);
++it;
}
ports.push_back(carry_in->name);
carry_in->port_id = ports.size();
ports.push_back(carry_out->name);
carry_out->port_id = ports.size();
}
}