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This commit is contained in:
Eddie Hung 2020-01-03 14:59:55 -08:00
parent 559f3379e8
commit a819656972
3 changed files with 7 additions and 63 deletions
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56
backends/aiger/xaiger.cc
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@ -336,8 +336,6 @@ struct XAigerWriter
}
}
bool blackbox = box_module->get_blackbox_attribute(true /* ignore_wb */);
// Fully pad all unused input connections of this box cell with S0
// Fully pad all undriven output connections of this box cell with anonymous wires
for (auto port_name : r.first->second) {
@ -615,65 +613,11 @@ struct XAigerWriter
if (holes_module) {
log_push();
// NB: fixup_ports() will sort ports by name
//holes_module->fixup_ports();
holes_module->check();
// Cannot techmap/aigmap/check all lib_whitebox-es outside of write_xaiger
// since boxes may contain parameters in which case `flatten` would have
// created a new $paramod ...
Pass::call_on_module(holes_module->design, holes_module, "wbflip");
Pass::call_on_module(holes_module->design, holes_module, "flatten -wb; techmap; aigmap");
dict<SigSig, SigSig> replace;
for (auto it = holes_module->cells_.begin(); it != holes_module->cells_.end(); ) {
auto cell = it->second;
if (cell->type.in("$_DFF_N_", "$_DFF_NN0_", "$_DFF_NN1_", "$_DFF_NP0_", "$_DFF_NP1_",
"$_DFF_P_", "$_DFF_PN0_", "$_DFF_PN1", "$_DFF_PP0_", "$_DFF_PP1_")) {
SigBit D = cell->getPort("\\D");
SigBit Q = cell->getPort("\\Q");
// Remove the DFF cell from what needs to be a combinatorial box
it = holes_module->cells_.erase(it);
Wire *port;
if (GetSize(Q.wire) == 1)
port = holes_module->wire(stringf("$abc%s", Q.wire->name.c_str()));
else
port = holes_module->wire(stringf("$abc%s[%d]", Q.wire->name.c_str(), Q.offset));
log_assert(port);
// Prepare to replace "assign <port> = DFF.Q;" with "assign <port> = DFF.D;"
// in order to extract the combinatorial control logic that feeds the box
// (i.e. clock enable, synchronous reset, etc.)
replace.insert(std::make_pair(SigSig(port,Q), SigSig(port,D)));
// Since `flatten` above would have created wires named "<cell>.Q",
// extract the pre-techmap cell name
auto pos = Q.wire->name.str().rfind(".");
log_assert(pos != std::string::npos);
IdString driver = Q.wire->name.substr(0, pos);
// And drive the signal that was previously driven by "DFF.Q" (typically
// used to implement clock-enable functionality) with the "<cell>.abc9_ff.Q"
// wire (which itself is driven an input port) we inserted above
Wire *currQ = holes_module->wire(stringf("%s.abc9_ff.Q", driver.c_str()));
log_assert(currQ);
holes_module->connect(Q, currQ);
continue;
}
else if (!cell->type.in("$_NOT_", "$_AND_"))
log_error("Whitebox contents cannot be represented as AIG. Please verify whiteboxes are synthesisable.\n");
++it;
}
for (auto &conn : holes_module->connections_) {
auto it = replace.find(conn);
if (it != replace.end())
conn = it->second;
}
// Move into a new (temporary) design so that "clean" will only
// operate (and run checks on) this one module
RTLIL::Design *holes_design = new RTLIL::Design;
module->design->modules_.erase(holes_module->name);
holes_design->add(holes_module);
Pass::call(holes_design, "opt -purge");
std::stringstream a_buffer;
XAigerWriter writer(holes_module);