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GraphDelayCalc1.cc
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// OpenSTA, Static Timing Analyzer
// Copyright (c) 2019, Parallax Software, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
#include "Machine.hh"
#include "Debug.hh"
#include "Stats.hh"
#include "Mutex.hh"
#include "MinMax.hh"
#include "PortDirection.hh"
#include "TimingRole.hh"
#include "TimingArc.hh"
#include "Liberty.hh"
#include "Network.hh"
#include "InputDrive.hh"
#include "Sdc.hh"
#include "Corner.hh"
#include "Graph.hh"
#include "Levelize.hh"
#include "SearchPred.hh"
#include "Bfs.hh"
#include "Parasitics.hh"
#include "ArcDelayCalc.hh"
#include "DcalcAnalysisPt.hh"
#include "NetCaps.hh"
#include "GraphDelayCalc1.hh"
namespace sta {
using std::abs;
static const Slew default_slew = 0.0;
typedef Set<MultiDrvrNet*> MultiDrvrNetSet;
static bool
isLeafDriver(const Pin *pin,
const Network *network);
// Cache parallel delay/slew values for nets with multiple drivers.
class MultiDrvrNet
{
public:
MultiDrvrNet(VertexSet *drvrs);
~MultiDrvrNet();
const VertexSet *drvrs() const { return drvrs_; }
VertexSet *drvrs() { return drvrs_; }
Vertex *dcalcDrvr() const { return dcalc_drvr_; }
void setDcalcDrvr(Vertex *drvr);
void parallelDelaySlew(const TransRiseFall *drvr_tr,
const DcalcAnalysisPt *dcalc_ap,
ArcDelayCalc *arc_delay_calc,
GraphDelayCalc1 *dcalc,
// Return values.
ArcDelay ¶llel_delay,
Slew ¶llel_slew);
void netCaps(const TransRiseFall *tr,
const DcalcAnalysisPt *dcalc_ap,
// Return values.
float &pin_cap,
float &wire_cap,
float &fanout,
bool &has_set_load);
void findCaps(const GraphDelayCalc1 *dcalc,
const Sdc *sdc);
private:
void findDelaysSlews(ArcDelayCalc *arc_delay_calc,
GraphDelayCalc1 *dcalc);
// Driver that triggers delay calculation for all the drivers on the net.
Vertex *dcalc_drvr_;
VertexSet *drvrs_;
// [drvr_tr->index][dcalc_ap->index]
ArcDelay *parallel_delays_;
// [drvr_tr->index][dcalc_ap->index]
Slew *parallel_slews_;
// [drvr_tr->index][dcalc_ap->index]
NetCaps *net_caps_;
bool delays_valid_:1;
};
MultiDrvrNet::MultiDrvrNet(VertexSet *drvrs) :
dcalc_drvr_(nullptr),
drvrs_(drvrs),
parallel_delays_(nullptr),
parallel_slews_(nullptr),
net_caps_(nullptr),
delays_valid_(false)
{
}
MultiDrvrNet::~MultiDrvrNet()
{
delete drvrs_;
if (delays_valid_) {
delete [] parallel_delays_;
delete [] parallel_slews_;
}
delete [] net_caps_;
}
void
MultiDrvrNet::parallelDelaySlew(const TransRiseFall *drvr_tr,
const DcalcAnalysisPt *dcalc_ap,
ArcDelayCalc *arc_delay_calc,
GraphDelayCalc1 *dcalc,
// Return values.
ArcDelay ¶llel_delay,
Slew ¶llel_slew)
{
if (!delays_valid_) {
findDelaysSlews(arc_delay_calc, dcalc);
delays_valid_ = true;
}
int index = dcalc_ap->index() * TransRiseFall::index_count
+ drvr_tr->index();
parallel_delay = parallel_delays_[index];
parallel_slew = parallel_slews_[index];
}
void
MultiDrvrNet::findDelaysSlews(ArcDelayCalc *arc_delay_calc,
GraphDelayCalc1 *dcalc)
{
Corners *corners = dcalc->corners();
int count = TransRiseFall::index_count * corners->dcalcAnalysisPtCount();
parallel_delays_ = new ArcDelay[count];
parallel_slews_ = new Slew[count];
DcalcAnalysisPtIterator ap_iter(dcalc);
while (ap_iter.hasNext()) {
DcalcAnalysisPt *dcalc_ap = ap_iter.next();
DcalcAPIndex ap_index = dcalc_ap->index();
const Pvt *pvt = dcalc_ap->operatingConditions();
TransRiseFallIterator drvr_tr_iter;
while (drvr_tr_iter.hasNext()) {
TransRiseFall *drvr_tr = drvr_tr_iter.next();
int drvr_tr_index = drvr_tr->index();
int index = ap_index*TransRiseFall::index_count+drvr_tr_index;
dcalc->findMultiDrvrGateDelay(this, drvr_tr, pvt, dcalc_ap,
arc_delay_calc,
parallel_delays_[index],
parallel_slews_[index]);
}
}
}
void
MultiDrvrNet::netCaps(const TransRiseFall *drvr_tr,
const DcalcAnalysisPt *dcalc_ap,
// Return values.
float &pin_cap,
float &wire_cap,
float &fanout,
bool &has_set_load)
{
int index = dcalc_ap->index() * TransRiseFall::index_count
+ drvr_tr->index();
NetCaps &net_caps = net_caps_[index];
pin_cap = net_caps.pinCap();
wire_cap = net_caps.wireCap();
fanout = net_caps.fanout();
has_set_load = net_caps.hasSetLoad();
}
void
MultiDrvrNet::findCaps(const GraphDelayCalc1 *dcalc,
const Sdc *sdc)
{
Corners *corners = dcalc->corners();
int count = TransRiseFall::index_count * corners->dcalcAnalysisPtCount();
net_caps_ = new NetCaps[count];
const Pin *drvr_pin = dcalc_drvr_->pin();
DcalcAnalysisPtIterator ap_iter(dcalc);
while (ap_iter.hasNext()) {
DcalcAnalysisPt *dcalc_ap = ap_iter.next();
DcalcAPIndex ap_index = dcalc_ap->index();
const Corner *corner = dcalc_ap->corner();
const OperatingConditions *op_cond = dcalc_ap->operatingConditions();
const MinMax *min_max = dcalc_ap->constraintMinMax();
TransRiseFallIterator drvr_tr_iter;
while (drvr_tr_iter.hasNext()) {
TransRiseFall *drvr_tr = drvr_tr_iter.next();
int drvr_tr_index = drvr_tr->index();
int index = ap_index * TransRiseFall::index_count + drvr_tr_index;
NetCaps &net_caps = net_caps_[index];
float pin_cap, wire_cap, fanout;
bool has_set_load;
// Find pin and external pin/wire capacitance.
sdc->connectedCap(drvr_pin, drvr_tr, op_cond, corner, min_max,
pin_cap, wire_cap, fanout, has_set_load);
net_caps.init(pin_cap, wire_cap, fanout, has_set_load);
}
}
}
void
MultiDrvrNet::setDcalcDrvr(Vertex *drvr)
{
dcalc_drvr_ = drvr;
}
////////////////////////////////////////////////////////////////
GraphDelayCalc1::GraphDelayCalc1(StaState *sta) :
GraphDelayCalc(sta),
observer_(nullptr),
delays_seeded_(false),
incremental_(false),
search_pred_(new SearchPred1(sta)),
search_non_latch_pred_(new SearchPredNonLatch2(sta)),
clk_pred_(new ClkTreeSearchPred(sta)),
iter_(new BfsFwdIterator(BfsIndex::dcalc, search_non_latch_pred_, sta)),
multi_drvr_nets_found_(false),
incremental_delay_tolerance_(0.0)
{
}
GraphDelayCalc1::~GraphDelayCalc1()
{
delete search_pred_;
delete search_non_latch_pred_;
delete clk_pred_;
delete iter_;
deleteMultiDrvrNets();
clearIdealClkMap();
delete observer_;
}
void
GraphDelayCalc1::deleteMultiDrvrNets()
{
MultiDrvrNetSet drvr_nets;
MultiDrvrNetMap::Iterator multi_iter(multi_drvr_net_map_);
while (multi_iter.hasNext()) {
MultiDrvrNet *multi_drvr = multi_iter.next();
// Multiple drvr pins point to the same drvr PinSet,
// so collect them into a set.
drvr_nets.insert(multi_drvr);
}
multi_drvr_net_map_.clear();
drvr_nets.deleteContents();
}
void
GraphDelayCalc1::copyState(const StaState *sta)
{
GraphDelayCalc::copyState(sta);
// Notify sub-components.
iter_->copyState(sta);
}
void
GraphDelayCalc1::clear()
{
delaysInvalid();
deleteMultiDrvrNets();
multi_drvr_nets_found_ = false;
GraphDelayCalc::clear();
}
float
GraphDelayCalc1::incrementalDelayTolerance()
{
return incremental_delay_tolerance_;
}
void
GraphDelayCalc1::setIncrementalDelayTolerance(float tol)
{
incremental_delay_tolerance_ = tol;
}
void
GraphDelayCalc1::setObserver(DelayCalcObserver *observer)
{
delete observer_;
observer_ = observer;
}
void
GraphDelayCalc1::delaysInvalid()
{
debugPrint0(debug_, "delay_calc", 1, "delays invalid\n");
delays_exist_ = false;
delays_seeded_ = false;
incremental_ = false;
iter_->clear();
clearIdealClkMap();
// No need to keep track of incremental updates any more.
invalid_delays_.clear();
invalid_checks_.clear();
}
void
GraphDelayCalc1::delayInvalid(const Pin *pin)
{
if (graph_
&& incremental_) {
if (network_->isHierarchical(pin)) {
EdgesThruHierPinIterator edge_iter(pin, network_, graph_);
while (edge_iter.hasNext()) {
Edge *edge = edge_iter.next();
delayInvalid(edge->from(graph_));
}
}
else {
Vertex *vertex, *bidirect_drvr_vertex;
graph_->pinVertices(pin, vertex, bidirect_drvr_vertex);
if (vertex)
delayInvalid(vertex);
if (bidirect_drvr_vertex)
delayInvalid(bidirect_drvr_vertex);
}
}
}
void
GraphDelayCalc1::delayInvalid(Vertex *vertex)
{
debugPrint1(debug_, "delay_calc", 2, "delays invalid %s\n",
vertex->name(sdc_network_));
if (graph_ && incremental_) {
invalid_delays_.insert(vertex);
// Invalidate driver that triggers dcalc for multi-driver nets.
MultiDrvrNet *multi_drvr = multiDrvrNet(vertex);
if (multi_drvr)
invalid_delays_.insert(multi_drvr->dcalcDrvr());
}
}
void
GraphDelayCalc1::deleteVertexBefore(Vertex *vertex)
{
iter_->deleteVertexBefore(vertex);
if (incremental_)
invalid_delays_.erase(vertex);
MultiDrvrNet *multi_drvr = multiDrvrNet(vertex);
if (multi_drvr) {
multi_drvr->drvrs()->erase(vertex);
multi_drvr_net_map_.erase(vertex);
}
}
////////////////////////////////////////////////////////////////
class FindVertexDelays : public VertexVisitor
{
public:
FindVertexDelays(GraphDelayCalc1 *graph_delay_calc1,
ArcDelayCalc *arc_delay_calc,
bool own_arc_delay_calc);
virtual ~FindVertexDelays();
virtual void visit(Vertex *vertex);
virtual VertexVisitor *copy();
protected:
GraphDelayCalc1 *graph_delay_calc1_;
ArcDelayCalc *arc_delay_calc_;
bool own_arc_delay_calc_;
};
FindVertexDelays::FindVertexDelays(GraphDelayCalc1 *graph_delay_calc1,
ArcDelayCalc *arc_delay_calc,
bool own_arc_delay_calc) :
VertexVisitor(),
graph_delay_calc1_(graph_delay_calc1),
arc_delay_calc_(arc_delay_calc),
own_arc_delay_calc_(own_arc_delay_calc)
{
}
FindVertexDelays::~FindVertexDelays()
{
if (own_arc_delay_calc_)
delete arc_delay_calc_;
}
VertexVisitor *
FindVertexDelays::copy()
{
// Copy StaState::arc_delay_calc_ because it needs separate state
// for each thread.
return new FindVertexDelays(graph_delay_calc1_,arc_delay_calc_->copy(),true);
}
void
FindVertexDelays::visit(Vertex *vertex)
{
graph_delay_calc1_->findVertexDelay(vertex, arc_delay_calc_, true);
}
// The logical structure of incremental delay calculation closely
// resembles the incremental search arrival time algorithm
// (Search::findArrivals).
void
GraphDelayCalc1::findDelays(Level level)
{
if (arc_delay_calc_) {
Stats stats(debug_);
int dcalc_count = 0;
debugPrint1(debug_, "delay_calc", 1, "find delays to level %d\n", level);
if (!delays_seeded_) {
iter_->clear();
ensureMultiDrvrNetsFound();
seedRootSlews();
delays_seeded_ = true;
}
else
iter_->ensureSize();
if (incremental_)
seedInvalidDelays();
FindVertexDelays visitor(this, arc_delay_calc_, false);
dcalc_count += iter_->visitParallel(level, &visitor);
// Timing checks require slews at both ends of the arc,
// so find their delays after all slews are known.
VertexSet::Iterator check_iter(invalid_checks_);
while (check_iter.hasNext()) {
Vertex *check_vertex = check_iter.next();
findCheckDelays(check_vertex, arc_delay_calc_);
}
invalid_checks_.clear();
delays_exist_ = true;
incremental_ = true;
debugPrint1(debug_, "delay_calc", 1, "found %d delays\n", dcalc_count);
stats.report("Delay calc");
}
}
void
GraphDelayCalc1::seedInvalidDelays()
{
VertexSet::Iterator vertex_iter(invalid_delays_);
while (vertex_iter.hasNext()) {
Vertex *vertex = vertex_iter.next();
if (vertex->isRoot())
seedRootSlew(vertex, arc_delay_calc_);
else {
if (search_non_latch_pred_->searchFrom(vertex))
iter_->enqueue(vertex);
}
}
invalid_delays_.clear();
}
class FindNetDrvrs : public PinVisitor
{
public:
FindNetDrvrs(PinSet &drvr_pins,
const Network *network,
const Graph *graph);
virtual void operator()(Pin *pin);
protected:
PinSet &drvr_pins_;
const Network *network_;
const Graph *graph_;
};
FindNetDrvrs::FindNetDrvrs(PinSet &drvr_pins,
const Network *network,
const Graph *graph) :
drvr_pins_(drvr_pins),
network_(network),
graph_(graph)
{
}
void
FindNetDrvrs::operator()(Pin *pin)
{
Vertex *vertex = graph_->pinDrvrVertex(pin);
if (isLeafDriver(pin, network_)
&& !vertex->isRoot())
drvr_pins_.insert(pin);
}
void
GraphDelayCalc1::ensureMultiDrvrNetsFound()
{
if (!multi_drvr_nets_found_) {
LeafInstanceIterator *inst_iter = network_->leafInstanceIterator();
while (inst_iter->hasNext()) {
Instance *inst = inst_iter->next();
InstancePinIterator *pin_iter = network_->pinIterator(inst);
while (pin_iter->hasNext()) {
Pin *pin = pin_iter->next();
Vertex *drvr_vertex = graph_->pinDrvrVertex(pin);
if (network_->isDriver(pin)
&& !multi_drvr_net_map_.hasKey(drvr_vertex)) {
PinSet drvr_pins;
FindNetDrvrs visitor(drvr_pins, network_, graph_);
network_->visitConnectedPins(pin, visitor);
if (drvr_pins.size() > 1)
makeMultiDrvrNet(drvr_pins);
}
}
delete pin_iter;
}
delete inst_iter;
multi_drvr_nets_found_ = true;
}
}
void
GraphDelayCalc1::makeMultiDrvrNet(PinSet &drvr_pins)
{
debugPrint0(debug_, "delay_calc", 3, "multi-driver net\n");
VertexSet *drvr_vertices = new VertexSet;
MultiDrvrNet *multi_drvr = new MultiDrvrNet(drvr_vertices);
Level max_drvr_level = 0;
Vertex *max_drvr = nullptr;
PinSet::Iterator pin_iter(drvr_pins);
while (pin_iter.hasNext()) {
Pin *pin = pin_iter.next();
Vertex *drvr_vertex = graph_->pinDrvrVertex(pin);
debugPrint1(debug_, "delay_calc", 3, " %s\n",
network_->pathName(pin));
multi_drvr_net_map_[drvr_vertex] = multi_drvr;
drvr_vertices->insert(drvr_vertex);
Level drvr_level = drvr_vertex->level();
if (max_drvr == nullptr
|| drvr_level > max_drvr_level)
max_drvr = drvr_vertex;
}
multi_drvr->setDcalcDrvr(max_drvr);
multi_drvr->findCaps(this, sdc_);
}
static bool
isLeafDriver(const Pin *pin,
const Network *network)
{
PortDirection *dir = network->direction(pin);
const Instance *inst = network->instance(pin);
return network->isLeaf(inst) && dir->isAnyOutput();
}
MultiDrvrNet *
GraphDelayCalc1::multiDrvrNet(const Vertex *drvr_vertex) const
{
return multi_drvr_net_map_.findKey(drvr_vertex);
}
void
GraphDelayCalc1::seedRootSlews()
{
VertexSet::Iterator root_iter(levelize_->roots());
while (root_iter.hasNext()) {
Vertex *vertex = root_iter.next();
seedRootSlew(vertex, arc_delay_calc_);
findIdealClks(vertex);
}
}
void
GraphDelayCalc1::seedRootSlew(Vertex *vertex,
ArcDelayCalc *arc_delay_calc)
{
if (vertex->isDriver(network_))
seedDrvrSlew(vertex, arc_delay_calc);
else
seedLoadSlew(vertex);
iter_->enqueueAdjacentVertices(vertex);
}
void
GraphDelayCalc1::seedDrvrSlew(Vertex *drvr_vertex,
ArcDelayCalc *arc_delay_calc)
{
const Pin *drvr_pin = drvr_vertex->pin();
debugPrint1(debug_, "delay_calc", 2, "seed driver slew %s\n",
drvr_vertex->name(sdc_network_));
InputDrive *drive = 0;
if (network_->isTopLevelPort(drvr_pin)) {
Port *port = network_->port(drvr_pin);
drive = sdc_->findInputDrive(port);
}
TransRiseFallIterator tr_iter;
while (tr_iter.hasNext()) {
TransRiseFall *tr = tr_iter.next();
DcalcAnalysisPtIterator ap_iter(this);
while (ap_iter.hasNext()) {
DcalcAnalysisPt *dcalc_ap = ap_iter.next();
if (drive) {
const MinMax *cnst_min_max = dcalc_ap->constraintMinMax();
LibertyCell *drvr_cell;
LibertyPort *from_port, *to_port;
float *from_slews;
drive->driveCell(tr, cnst_min_max, drvr_cell, from_port,
from_slews, to_port);
if (drvr_cell) {
if (from_port == nullptr)
from_port = driveCellDefaultFromPort(drvr_cell, to_port);
findInputDriverDelay(drvr_cell, drvr_pin, drvr_vertex, tr,
from_port, from_slews, to_port, dcalc_ap);
}
else
seedNoDrvrCellSlew(drvr_vertex, drvr_pin, tr, drive, dcalc_ap,
arc_delay_calc);
}
else
seedNoDrvrSlew(drvr_vertex, drvr_pin, tr, dcalc_ap, arc_delay_calc);
}
}
}
void
GraphDelayCalc1::seedNoDrvrCellSlew(Vertex *drvr_vertex,
const Pin *drvr_pin,
const TransRiseFall *tr,
InputDrive *drive,
DcalcAnalysisPt *dcalc_ap,
ArcDelayCalc *arc_delay_calc)
{
DcalcAPIndex ap_index = dcalc_ap->index();
const MinMax *cnst_min_max = dcalc_ap->constraintMinMax();
Slew slew = default_slew;
float drive_slew;
bool exists;
drive->slew(tr, cnst_min_max, drive_slew, exists);
if (exists)
slew = drive_slew;
else {
// Top level bidirect driver uses load slew unless
// bidirect instance paths are disabled.
if (sdc_->bidirectDrvrSlewFromLoad(drvr_pin)) {
Vertex *load_vertex = graph_->pinLoadVertex(drvr_pin);
slew = graph_->slew(load_vertex, tr, ap_index);
}
}
Delay drive_delay = delay_zero;
float drive_res;
drive->driveResistance(tr, cnst_min_max, drive_res, exists);
Parasitic *parasitic = arc_delay_calc->findParasitic(drvr_pin, tr, dcalc_ap);
if (exists) {
float cap = loadCap(drvr_pin, parasitic, tr, dcalc_ap);
drive_delay = cap * drive_res;
slew = cap * drive_res;
}
const MinMax *slew_min_max = dcalc_ap->slewMinMax();
if (!drvr_vertex->slewAnnotated(tr, slew_min_max))
graph_->setSlew(drvr_vertex, tr, ap_index, slew);
arc_delay_calc->inputPortDelay(drvr_pin, delayAsFloat(slew), tr,
parasitic, dcalc_ap);
annotateLoadDelays(drvr_vertex, tr, drive_delay, false, dcalc_ap,
arc_delay_calc);
}
void
GraphDelayCalc1::seedNoDrvrSlew(Vertex *drvr_vertex,
const Pin *drvr_pin,
const TransRiseFall *tr,
DcalcAnalysisPt *dcalc_ap,
ArcDelayCalc *arc_delay_calc)
{
const MinMax *slew_min_max = dcalc_ap->slewMinMax();
DcalcAPIndex ap_index = dcalc_ap->index();
Slew slew(default_slew);
// Top level bidirect driver uses load slew unless
// bidirect instance paths are disabled.
if (sdc_->bidirectDrvrSlewFromLoad(drvr_pin)) {
Vertex *load_vertex = graph_->pinLoadVertex(drvr_pin);
slew = graph_->slew(load_vertex, tr, ap_index);
}
if (!drvr_vertex->slewAnnotated(tr, slew_min_max))
graph_->setSlew(drvr_vertex, tr, ap_index, slew);
Parasitic *parasitic = arc_delay_calc->findParasitic(drvr_pin, tr, dcalc_ap);
arc_delay_calc->inputPortDelay(drvr_pin, delayAsFloat(slew), tr,
parasitic, dcalc_ap);
annotateLoadDelays(drvr_vertex, tr, delay_zero, false, dcalc_ap,
arc_delay_calc);
}
void
GraphDelayCalc1::seedLoadSlew(Vertex *vertex)
{
const Pin *pin = vertex->pin();
debugPrint1(debug_, "delay_calc", 2, "seed load slew %s\n",
vertex->name(sdc_network_));
ClockSet *clks = sdc_->findVertexPinClocks(pin);
initSlew(vertex);
TransRiseFallIterator tr_iter;
while (tr_iter.hasNext()) {
const TransRiseFall *tr = tr_iter.next();
DcalcAnalysisPtIterator ap_iter(this);
while (ap_iter.hasNext()) {
DcalcAnalysisPt *dcalc_ap = ap_iter.next();
const MinMax *slew_min_max = dcalc_ap->slewMinMax();
if (!vertex->slewAnnotated(tr, slew_min_max)) {
float slew = 0.0;
if (clks) {
slew = slew_min_max->initValue();
ClockSet::Iterator clk_iter(clks);
while (clk_iter.hasNext()) {
Clock *clk = clk_iter.next();
float clk_slew = clk->slew(tr, slew_min_max);
if (slew_min_max->compare(clk_slew, slew))
slew = clk_slew;
}
}
DcalcAPIndex ap_index = dcalc_ap->index();
graph_->setSlew(vertex, tr, ap_index, slew);
}
}
}
}
// If a driving cell does not specify a -from_pin, the first port
// defined in the cell that has a timing group to the output port
// is used. Not exactly reasonable, but it's compatible.
LibertyPort *
GraphDelayCalc1::driveCellDefaultFromPort(LibertyCell *cell,
LibertyPort *to_port)
{
LibertyPort *from_port = 0;
int from_port_index = 0;
LibertyCellTimingArcSetIterator set_iter(cell);
while (set_iter.hasNext()) {
TimingArcSet *arc_set = set_iter.next();
if (arc_set->to() == to_port) {
LibertyPort *set_from_port = arc_set->from();
int set_from_port_index = findPortIndex(cell, set_from_port);
if (from_port == nullptr
|| set_from_port_index < from_port_index) {
from_port = set_from_port;
from_port_index = set_from_port_index;
}
}
}
return from_port;
}
// Find the index that port is defined in cell.
int
GraphDelayCalc1::findPortIndex(LibertyCell *cell,
LibertyPort *port)
{
int index = 0;
LibertyCellPortIterator port_iter(cell);
while (port_iter.hasNext()) {
LibertyPort *cell_port = port_iter.next();
if (cell_port == port)
return index;
index++;
}
internalError("port not found in cell");
return 0;
}
void
GraphDelayCalc1::findInputDriverDelay(LibertyCell *drvr_cell,
const Pin *drvr_pin,
Vertex *drvr_vertex,
const TransRiseFall *tr,
LibertyPort *from_port,
float *from_slews,
LibertyPort *to_port,
DcalcAnalysisPt *dcalc_ap)
{
debugPrint2(debug_, "delay_calc", 2, " driver cell %s %s\n",
drvr_cell->name(),
tr->asString());
LibertyCellTimingArcSetIterator set_iter(drvr_cell);
while (set_iter.hasNext()) {
TimingArcSet *arc_set = set_iter.next();
if (arc_set->from() == from_port
&& arc_set->to() == to_port) {
TimingArcSetArcIterator arc_iter(arc_set);
while (arc_iter.hasNext()) {
TimingArc *arc = arc_iter.next();
if (arc->toTrans()->asRiseFall() == tr) {
float from_slew = from_slews[arc->fromTrans()->index()];
findInputArcDelay(drvr_cell, drvr_pin, drvr_vertex,
arc, from_slew, dcalc_ap);
}
}
}
}
}
// Driving cell delay is the load dependent delay, which is the gate
// delay minus the intrinsic delay. Driving cell delays are annotated
// to the wire arcs from the input port pin to the load pins.
void
GraphDelayCalc1::findInputArcDelay(LibertyCell *drvr_cell,
const Pin *drvr_pin,
Vertex *drvr_vertex,
TimingArc *arc,
float from_slew,
DcalcAnalysisPt *dcalc_ap)
{
debugPrint5(debug_, "delay_calc", 3, " %s %s -> %s %s (%s)\n",
arc->from()->name(),
arc->fromTrans()->asString(),
arc->to()->name(),
arc->toTrans()->asString(),
arc->role()->asString());
TransRiseFall *drvr_tr = arc->toTrans()->asRiseFall();
if (drvr_tr) {
DcalcAPIndex ap_index = dcalc_ap->index();
const Pvt *pvt = dcalc_ap->operatingConditions();
Parasitic *drvr_parasitic = arc_delay_calc_->findParasitic(drvr_pin, drvr_tr,
dcalc_ap);
float load_cap = loadCap(drvr_pin, drvr_parasitic, drvr_tr, dcalc_ap);
ArcDelay intrinsic_delay;
Slew intrinsic_slew;
arc_delay_calc_->gateDelay(drvr_cell, arc, Slew(from_slew),
0.0, 0, 0.0, pvt, dcalc_ap,
intrinsic_delay, intrinsic_slew);
// For input drivers there is no instance to find a related_output_pin.
ArcDelay gate_delay;
Slew gate_slew;
arc_delay_calc_->gateDelay(drvr_cell, arc,
Slew(from_slew), load_cap,
drvr_parasitic, 0.0, pvt, dcalc_ap,
gate_delay, gate_slew);
ArcDelay load_delay = gate_delay - intrinsic_delay;
debugPrint3(debug_, "delay_calc", 3,
" gate delay = %s intrinsic = %s slew = %s\n",
delayAsString(gate_delay, this),
delayAsString(intrinsic_delay, this),
delayAsString(gate_slew, this));
graph_->setSlew(drvr_vertex, drvr_tr, ap_index, gate_slew);
annotateLoadDelays(drvr_vertex, drvr_tr, load_delay, false, dcalc_ap,
arc_delay_calc_);
}
}
void
GraphDelayCalc1::findVertexDelay(Vertex *vertex,
ArcDelayCalc *arc_delay_calc,
bool propagate)
{
const Pin *pin = vertex->pin();
bool ideal_clks_changed = findIdealClks(vertex);
// Don't clobber root slews.
if (!vertex->isRoot()) {
debugPrint2(debug_, "delay_calc", 2, "find delays %s (%s)\n",
vertex->name(sdc_network_),
network_->cellName(network_->instance(pin)));
if (network_->isLeaf(pin)) {
if (vertex->isDriver(network_)) {
bool delay_changed = findDriverDelays(vertex, arc_delay_calc);
if (propagate) {
if (network_->direction(pin)->isInternal())
enqueueTimingChecksEdges(vertex);
// Enqueue adjacent vertices even if the delays did not
// change when non-incremental to stride past annotations.
if (delay_changed || ideal_clks_changed || !incremental_)
iter_->enqueueAdjacentVertices(vertex);
}
}
else {
// Load vertex.
enqueueTimingChecksEdges(vertex);
// Enqueue driver vertices from this input load.
if (propagate)
iter_->enqueueAdjacentVertices(vertex);
}
}
// Bidirect port drivers are enqueued by their load vertex in
// annotateLoadDelays.
else if (vertex->isBidirectDriver()
&& network_->isTopLevelPort(pin))
seedRootSlew(vertex, arc_delay_calc);
}
}
void
GraphDelayCalc1::enqueueTimingChecksEdges(Vertex *vertex)
{
if (vertex->hasChecks()
|| vertex->isCheckClk()) {
UniqueLock lock(check_vertices_lock_);
invalid_checks_.insert(vertex);
}
}
bool
GraphDelayCalc1::findDriverDelays(Vertex *drvr_vertex,
ArcDelayCalc *arc_delay_calc)
{
bool delay_changed = false;
MultiDrvrNet *multi_drvr = multiDrvrNet(drvr_vertex);
if (multi_drvr) {
Vertex *dcalc_drvr = multi_drvr->dcalcDrvr();
if (drvr_vertex == dcalc_drvr) {
bool init_load_slews = true;
VertexSet::Iterator drvr_iter(multi_drvr->drvrs());
while (drvr_iter.hasNext()) {
Vertex *drvr_vertex = drvr_iter.next();
// Only init load slews once so previous driver dcalc results
// aren't clobbered.
delay_changed |= findDriverDelays1(drvr_vertex, init_load_slews,
multi_drvr, arc_delay_calc);
init_load_slews = false;
}
}
}
else
delay_changed = findDriverDelays1(drvr_vertex, true, nullptr, arc_delay_calc);
arc_delay_calc->finishDrvrPin();
return delay_changed;
}
bool
GraphDelayCalc1::findDriverDelays1(Vertex *drvr_vertex,
bool init_load_slews,
MultiDrvrNet *multi_drvr,
ArcDelayCalc *arc_delay_calc)
{
const Pin *drvr_pin = drvr_vertex->pin();
Instance *drvr_inst = network_->instance(drvr_pin);
LibertyCell *drvr_cell = network_->libertyCell(drvr_inst);
initSlew(drvr_vertex);
initWireDelays(drvr_vertex, init_load_slews);
bool delay_changed = false;
VertexInEdgeIterator edge_iter(drvr_vertex, graph_);
while (edge_iter.hasNext()) {
Edge *edge = edge_iter.next();
Vertex *from_vertex = edge->from(graph_);
// Don't let disabled edges set slews that influence downstream delays.
if (search_pred_->searchFrom(from_vertex)
&& search_pred_->searchThru(edge))
delay_changed |= findDriverEdgeDelays(drvr_cell, drvr_inst, drvr_pin,
drvr_vertex, multi_drvr, edge,
arc_delay_calc);
}
if (delay_changed && observer_)
observer_->delayChangedTo(drvr_vertex);
return delay_changed;
}
// Init slews to zero on root vertices that are not inputs, such as
// floating input pins.
void
GraphDelayCalc1::initRootSlews(Vertex *vertex)
{
DcalcAnalysisPtIterator ap_iter(this);
while (ap_iter.hasNext()) {
DcalcAnalysisPt *dcalc_ap = ap_iter.next();
const MinMax *slew_min_max = dcalc_ap->slewMinMax();
DcalcAPIndex ap_index = dcalc_ap->index();
TransRiseFallIterator tr_iter;
while (tr_iter.hasNext()) {
TransRiseFall *tr = tr_iter.next();
if (!vertex->slewAnnotated(tr, slew_min_max))
graph_->setSlew(vertex, tr, ap_index, default_slew);
}
}
}
bool
GraphDelayCalc1::findDriverEdgeDelays(LibertyCell *drvr_cell,
Instance *drvr_inst,
const Pin *drvr_pin,
Vertex *drvr_vertex,
MultiDrvrNet *multi_drvr,
Edge *edge,
ArcDelayCalc *arc_delay_calc)
{
Vertex *in_vertex = edge->from(graph_);
TimingArcSet *arc_set = edge->timingArcSet();
const LibertyPort *related_out_port = arc_set->relatedOut();
const Pin *related_out_pin = 0;
bool delay_changed = false;
if (related_out_port)
related_out_pin = network_->findPin(drvr_inst, related_out_port);
DcalcAnalysisPtIterator ap_iter(this);
while (ap_iter.hasNext()) {
DcalcAnalysisPt *dcalc_ap = ap_iter.next();
const Pvt *pvt = sdc_->pvt(drvr_inst, dcalc_ap->constraintMinMax());
if (pvt == nullptr)
pvt = dcalc_ap->operatingConditions();
TimingArcSetArcIterator arc_iter(arc_set);
while (arc_iter.hasNext()) {
TimingArc *arc = arc_iter.next();
const TransRiseFall *tr = arc->toTrans()->asRiseFall();
Parasitic *parasitic = arc_delay_calc->findParasitic(drvr_pin, tr,
dcalc_ap);