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Revert "Cleanup/optimise toposort in write_xaiger"

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This reverts commit 1948e7c846.

Restores old toposort with optimisations
This commit is contained in:
Eddie Hung 2019-06-14 13:28:47 -07:00
parent 6c5ed8b660
commit 4d7516f459
1 changed files with 40 additions and 44 deletions
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84
backends/aiger/xaiger.cc
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@ -185,9 +185,8 @@ struct XAigerWriter
if (!bit.wire->port_input)
unused_bits.erase(bit);
SigMap topomap;
topomap.database = sigmap.database;
dict<SigBit, pool<IdString>> bit_drivers, bit_users;
TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
bool abc_box_seen = false;
for (auto cell : module->selected_cells()) {
@ -198,8 +197,11 @@ struct XAigerWriter
unused_bits.erase(A);
undriven_bits.erase(Y);
not_map[Y] = A;
if (!holes_mode)
topomap.add(Y, A);
if (!holes_mode) {
toposort.node(cell->name);
bit_users[A].insert(cell->name);
bit_drivers[Y].insert(cell->name);
}
continue;
}
@ -223,12 +225,16 @@ struct XAigerWriter
undriven_bits.erase(Y);
and_map[Y] = make_pair(A, B);
if (!holes_mode) {
topomap.add(Y, A);
topomap.add(Y, B);
toposort.node(cell->name);
bit_users[A].insert(cell->name);
bit_users[B].insert(cell->name);
bit_drivers[Y].insert(cell->name);
}
continue;
}
log_assert(!holes_mode);
//if (cell->type == "$initstate")
//{
// SigBit Y = sigmap(cell->getPort("\\Y").as_bit());
@ -265,11 +271,26 @@ struct XAigerWriter
// }
// if (!abc_box_seen)
// abc_box_seen = inst_module->attributes.count("\\abc_box_id");
// ff_bits.emplace_back(d, q);
//}
/*else*/ if (inst_module && inst_module->attributes.count("\\abc_box_id")) {
abc_box_seen = true;
if (!holes_mode) {
toposort.node(cell->name);
for (const auto &conn : cell->connections()) {
if (cell->input(conn.first)) {
// Ignore inout for the sake of topographical ordering
if (cell->output(conn.first)) continue;
for (auto bit : sigmap(conn.second))
bit_users[bit].insert(cell->name);
}
if (cell->output(conn.first))
for (auto bit : sigmap(conn.second))
bit_drivers[bit].insert(cell->name);
}
}
}
else {
for (const auto &c : cell->connections()) {
@ -309,45 +330,19 @@ struct XAigerWriter
}
if (abc_box_seen && !holes_mode) {
TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
dict<SigBit, pool<IdString>> bit_drivers, bit_users;
for (auto cell : module->selected_cells()) {
RTLIL::Module* inst_module = module->design->module(cell->type);
if (!inst_module || !inst_module->attributes.count("\\abc_box_id"))
continue;
toposort.node(cell->name);
for (const auto &conn : cell->connections()) {
if (cell->input(conn.first)) {
// Ignore inout for the sake of topographical ordering
if (cell->output(conn.first)) continue;
for (auto bit : topomap(conn.second))
if (bit.wire)
bit_users[bit].insert(cell->name);
}
if (cell->output(conn.first)) {
RTLIL::Wire* inst_module_port = inst_module->wire(conn.first);
log_assert(inst_module_port);
//if (inst_module_port->attributes.count("\\abc_flop_q"))
// continue;
for (auto bit : topomap(conn.second))
bit_drivers[bit].insert(cell->name);
}
}
}
for (auto &it : bit_users)
if (bit_drivers.count(it.first))
for (auto driver_cell : bit_drivers.at(it.first))
for (auto user_cell : it.second)
toposort.edge(driver_cell, user_cell);
for (auto user_cell : it.second)
toposort.edge(driver_cell, user_cell);
#if 1
pool<RTLIL::Module*> abc_carry_modules;
#if 0
toposort.analyze_loops = true;
#endif
bool no_loops = toposort.sort();
#if 1
#if 0
unsigned i = 0;
for (auto &it : toposort.loops) {
log(" loop %d", i++);
@ -358,14 +353,13 @@ struct XAigerWriter
#endif
log_assert(no_loops);
pool<RTLIL::Module*> abc_carry_modules;
for (auto cell_name : toposort.sorted) {
RTLIL::Cell *cell = module->cell(cell_name);
RTLIL::Module* box_module = module->design->module(cell->type);
log_assert(box_module);
log_assert(box_module->attributes.count("\\abc_box_id"));
if (!box_module || !box_module->attributes.count("\\abc_box_id"))
continue;
if (!abc_carry_modules.count(box_module) && box_module->attributes.count("\\abc_carry")) {
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) {
@ -461,6 +455,8 @@ struct XAigerWriter
}
box_list.emplace_back(cell);
}
// TODO: Free memory from toposort, bit_drivers, bit_users
}
for (auto bit : input_bits) {