File size: 5,173 Bytes
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// Copyright (c) 2023-2025, The OpenROAD Authors
#include <memory>
#include <string>
#include "ant/AntennaChecker.hh"
#include "db_sta/dbNetwork.hh"
#include "db_sta/dbSta.hh"
#include "est/EstimateParasitics.h"
#include "grt/GlobalRouter.h"
#include "gtest/gtest.h"
#include "odb/db.h"
#include "odb/dbSet.h"
#include "odb/dbTypes.h"
#include "odb/geom.h"
#include "odb/lefin.h"
#include "rsz/Resizer.hh"
#include "sta/Graph.hh"
#include "sta/Liberty.hh"
#include "sta/NetworkClass.hh"
#include "sta/Sta.hh"
#include "stt/SteinerTreeBuilder.h"
#include "tst/fixture.h"
#include "tst/nangate45_fixture.h"
#include "utl/Logger.h"
#include "utl/ServiceRegistry.h"
#include "utl/deleter.h"
namespace rsz {
static const std::string prefix("_main/src/rsz/test/");
class BufRemTest : public tst::Nangate45Fixture
{
protected:
BufRemTest()
: // initializer resizer
stt_(&logger_),
service_registry_(&logger_),
dp_(db_.get(), &logger_),
ant_(db_.get(), &logger_),
grt_(&logger_,
&service_registry_,
&stt_,
db_.get(),
sta_.get(),
&ant_,
&dp_),
ep_(&logger_, &service_registry_, db_.get(), sta_.get(), &stt_, &grt_),
resizer_(&logger_, db_.get(), sta_.get(), &stt_, &grt_, &dp_, &ep_)
{
library_ = readLiberty(prefix + "Nangate45/Nangate45_typ.lib");
db_network_ = sta_->getDbNetwork();
db_network_->setBlock(block_);
block_->setDieArea(odb::Rect(0, 0, 1000, 1000));
// register proper callbacks for timer like read_def
sta_->postReadDef(block_);
// create a chain consisting of 4 buffers
const char* layer = "metal1";
makeBTerm(block_,
"in1",
{.bpins = {{.layer_name = layer, .rect = {0, 0, 10, 10}}}});
odb::dbBTerm* outPort = makeBTerm(
block_,
"out1",
{.io_type = odb::dbIoType::OUTPUT,
.bpins = {{.layer_name = layer, .rect = {990, 990, 1000, 1000}}}});
makeBTerm(
block_,
"out2",
{.io_type = odb::dbIoType::OUTPUT,
.bpins = {{.layer_name = layer, .rect = {980, 980, 1000, 990}}}});
auto makeInst = [&](const char* master_name,
const char* inst_name,
const odb::Point& location,
const char* in_net,
const char* out_net) {
odb::dbMaster* master = db_->findMaster(master_name);
return tst::Fixture::makeInst(
block_,
master,
inst_name,
{.location = location,
.status = odb::dbPlacementStatus::PLACED,
.iterms = {{.net_name = in_net, .term_name = "A"},
{.net_name = out_net, .term_name = "Z"}}});
};
makeInst("BUF_X1", "b1", {100, 100}, "in1", "n1");
makeInst("BUF_X2", "b2", {200, 200}, "n1", "n2");
makeInst("BUF_X4", "b3", {300, 300}, "n2", "n3");
makeInst("BUF_X8", "b4", {400, 400}, "n3", "out1");
makeInst("BUF_X8", "b5", {500, 500}, "n1", "out2");
sta::Graph* graph = sta_->ensureGraph();
sta::Pin* outStaPin = db_network_->dbToSta(outPort);
outVertex_ = graph->pinLoadVertex(outStaPin);
}
stt::SteinerTreeBuilder stt_;
utl::ServiceRegistry service_registry_;
dpl::Opendp dp_;
ant::AntennaChecker ant_;
grt::GlobalRouter grt_;
est::EstimateParasitics ep_;
Resizer resizer_;
sta::LibertyLibrary* library_{nullptr};
sta::dbNetwork* db_network_{nullptr};
sta::Vertex* outVertex_{nullptr};
};
TEST_F(BufRemTest, SlackImproves)
{
const float origArrival = sta_->arrival(outVertex_,
sta::RiseFallBoth::riseFall(),
sta_->scenes(),
sta::MinMax::max());
// Remove buffers 'b2' and 'b3' from the buffer chain
resizer_.initBlock();
db_->setLogger(&logger_);
{
est::IncrementalParasiticsGuard guard(&ep_);
resizer_.journalBeginTest();
resizer_.logger()->setDebugLevel(utl::RSZ, "journal", 1);
auto insts = std::make_unique<sta::InstanceSeq>();
odb::dbInst* inst1 = block_->findInst("b2");
sta::Instance* sta_inst1 = db_network_->dbToSta(inst1);
insts->emplace_back(sta_inst1);
odb::dbInst* inst2 = block_->findInst("b3");
sta::Instance* sta_inst2 = db_network_->dbToSta(inst2);
insts->emplace_back(sta_inst2);
resizer_.removeBuffers(*insts);
const float newArrival = sta_->arrival(outVertex_,
sta::RiseFallBoth::riseFall(),
sta_->scenes(),
sta::MinMax::max());
EXPECT_LT(newArrival, origArrival);
resizer_.journalRestoreTest();
}
const float restoredArrival = sta_->arrival(outVertex_,
sta::RiseFallBoth::riseFall(),
sta_->scenes(),
sta::MinMax::max());
EXPECT_EQ(restoredArrival, origArrival);
}
} // namespace rsz
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