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Carry in/out to be the last input/output for chains to be preserved

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This commit is contained in:
Eddie Hung 2019-05-30 01:23:36 -07:00
parent 8c58c728a7
commit fdfc18be91
4 changed files with 91 additions and 12 deletions
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38
frontends/aiger/aigerparse.cc
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@ -549,6 +549,7 @@ void AigerReader::post_process()
std::string type, symbol;
int variable, index;
int pi_count = 0, ci_count = 0, co_count = 0;
pool<RTLIL::Module*> abc_carry_modules;
while (mf >> type >> variable >> index >> symbol) {
RTLIL::IdString escaped_s = RTLIL::escape_id(symbol);
if (type == "input") {
@ -646,6 +647,43 @@ void AigerReader::post_process()
module->rename(cell, escaped_s);
RTLIL::Module* box_module = design->module(cell->type);
log_assert(box_module);
if (box_module->attributes.count("\\abc_carry") && !abc_carry_modules.count(box_module)) {
RTLIL::Wire* carry_in = nullptr, *carry_out = nullptr;
RTLIL::Wire* last_in = nullptr, *last_out = nullptr;
for (const auto &port_name : box_module->ports) {
RTLIL::Wire* w = box_module->wire(port_name);
log_assert(w);
if (w->port_input) {
if (w->attributes.count("\\abc_carry_in")) {
log_assert(!carry_in);
carry_in = w;
}
log_assert(!last_in || last_in->port_id < w->port_id);
last_in = w;
}
if (w->port_output) {
if (w->attributes.count("\\abc_carry_out")) {
log_assert(!carry_out);
carry_out = w;
}
log_assert(!last_out || last_out->port_id < w->port_id);
last_out = w;
}
}
if (carry_in != last_in) {
std::swap(box_module->ports[carry_in->port_id], box_module->ports[last_in->port_id]);
std::swap(carry_in->port_id, last_in->port_id);
}
if (carry_out != last_out) {
log_assert(last_out);
std::swap(box_module->ports[carry_out->port_id], box_module->ports[last_out->port_id]);
std::swap(carry_out->port_id, last_out->port_id);
}
}
// NB: Assume box_module->ports are sorted alphabetically
// (as RTLIL::Module::fixup_ports() would do)
for (auto port_name : box_module->ports) {