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abc9: rework submod -- since it won't move (* keep *) cells

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This commit is contained in:
Eddie Hung 2020-04-21 17:25:15 -07:00
parent 8cda29137e
commit 2946bb60e9
2 changed files with 31 additions and 36 deletions
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7
passes/techmap/abc9.cc
View file

@ -309,9 +309,6 @@ struct Abc9Pass : public ScriptPass
run("setattr -set submod \"$abc9_flop\" t:$_DFF_?_ %ci* %co* t:$_DFF_?_ %d", " (only if -dff)"); run("setattr -set submod \"$abc9_flop\" t:$_DFF_?_ %ci* %co* t:$_DFF_?_ %d", " (only if -dff)");
run("submod", " (only if -dff)"); run("submod", " (only if -dff)");
run("setattr -mod -set whitebox 1 -set abc9_flop 1 -set abc9_box 1 *_$abc9_flop", "(only if -dff)"); run("setattr -mod -set whitebox 1 -set abc9_flop 1 -set abc9_box 1 *_$abc9_flop", "(only if -dff)");
run("abc9_ops -prep_dff_unmap", " (only if -dff)");
run("design -copy-to $abc9 *_$abc9_flop", " (only if -dff)"); // copy submod out
run("delete *_$abc9_flop", " (only if -dff)");
if (help_mode) { if (help_mode) {
run("foreach module in design"); run("foreach module in design");
run(" rename <module-name>_$abc9_flop _TECHMAP_REPLACE_", " (only if -dff)"); run(" rename <module-name>_$abc9_flop _TECHMAP_REPLACE_", " (only if -dff)");
@ -323,7 +320,11 @@ struct Abc9Pass : public ScriptPass
if (module->cell(stringf("%s_$abc9_flop", module->name.c_str()))) if (module->cell(stringf("%s_$abc9_flop", module->name.c_str())))
run(stringf("rename %s_$abc9_flop _TECHMAP_REPLACE_", module->name.c_str())); run(stringf("rename %s_$abc9_flop _TECHMAP_REPLACE_", module->name.c_str()));
} }
active_design->selected_active_module.clear();
} }
run("abc9_ops -prep_dff_unmap", " (only if -dff)");
run("design -copy-to $abc9 *_$abc9_flop", " (only if -dff)"); // copy submod out
run("delete *_$abc9_flop", " (only if -dff)");
} }
} }
run("design -stash $abc9_map"); run("design -stash $abc9_map");

60
passes/techmap/abc9_ops.cc
View file

@ -474,22 +474,11 @@ void prep_dff_submod(RTLIL::Design *design)
specify_cells.emplace_back(cell); specify_cells.emplace_back(cell);
log_assert(dff_cell); log_assert(dff_cell);
// Add dummy buffers for all module inputs/outputs // Add an always-enabled CE mux that drives $_DFF_[NP]_.D so that:
// to ensure that these ports exists in the flop box // (a) flop box will have an output
// created by later submod pass // (b) $_DFF_[NP]_.Q will be present as an input
for (auto port_name : module->ports) {
auto port = module->wire(port_name);
log_assert(GetSize(port) == 1);
auto c = module->addBufGate(NEW_ID, port, module->addWire(NEW_ID));
// Need to set (* keep *) otherwise opt_clean
// inside submod will blow it away
c->set_bool_attribute(ID::keep);
}
// Add an additional buffer that drives $_DFF_[NP]_.D
// so that the flop box will have an output
SigBit D = module->addWire(NEW_ID); SigBit D = module->addWire(NEW_ID);
Cell *c = module->addBufGate(NEW_ID, dff_cell->getPort(ID::D), D); module->addMuxGate(NEW_ID, dff_cell->getPort(ID::D), Q, State::S0, D);
c->set_bool_attribute(ID::keep);
dff_cell->setPort(ID::D, D); dff_cell->setPort(ID::D, D);
// Rewrite $specify cells that end with $_DFF_[NP]_.Q // Rewrite $specify cells that end with $_DFF_[NP]_.Q
@ -513,26 +502,31 @@ void prep_dff_unmap(RTLIL::Design *design)
if (!module->get_bool_attribute(ID::abc9_flop) || module->get_bool_attribute(ID::abc9_box)) if (!module->get_bool_attribute(ID::abc9_flop) || module->get_bool_attribute(ID::abc9_box))
continue; continue;
auto unmap_module = unmap_design->addModule(module->name.str() + "_$abc9_flop"); // Make sure the box module has all the same ports present on flop cell
auto replace_cell = unmap_module->addCell(ID::_TECHMAP_REPLACE_, module->name); auto replace_cell = module->cell(ID::_TECHMAP_REPLACE_);
for (auto port_name : module->ports) { log_assert(replace_cell);
auto w = unmap_module->addWire(port_name, module->wire(port_name)); auto box_module = design->module(module->name.str() + "_$abc9_flop");
// Do not propagate (* init *) values inside the box
if (w->port_output)
w->attributes.erase(ID::init);
replace_cell->setPort(port_name, w);
}
// Add new ports appearing in "_$abc9_flop"
auto box_module = design->module(unmap_module->name);
log_assert(box_module); log_assert(box_module);
for (auto port_name : module->ports) {
auto port = module->wire(port_name);
auto box_port = box_module->wire(port_name);
if (box_port) {
// Do not propagate init -- already captured by box
box_port->attributes.erase(ID::init);
continue;
}
log_assert(port->port_input);
box_module->addWire(port_name, port);
replace_cell->setPort(port_name, port);
}
box_module->fixup_ports();
auto unmap_module = unmap_design->addModule(box_module->name);
replace_cell = unmap_module->addCell(ID::_TECHMAP_REPLACE_, module->name);
for (auto port_name : box_module->ports) { for (auto port_name : box_module->ports) {
auto port = box_module->wire(port_name); auto w = unmap_module->addWire(port_name, box_module->wire(port_name));
auto unmap_port = unmap_module->wire(port_name); if (module->wire(port_name))
if (!unmap_port) replace_cell->setPort(port_name, w);
unmap_port = unmap_module->addWire(port_name, port);
else
unmap_port->port_id = port->port_id;
} }
unmap_module->ports = box_module->ports; unmap_module->ports = box_module->ports;
unmap_module->check(); unmap_module->check();