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delay calc clip delay to 0.0 resolves #405 

Signed-off-by: James Cherry <cherry@parallaxsw.com>
This commit is contained in:
James Cherry 2026-03-24 18:42:47 -07:00
parent d233581e16
commit b9e439f41c
3 changed files with 27 additions and 25 deletions
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14
dcalc/DmpCeff.cc
View File

@ -448,10 +448,10 @@ DmpAlg::showJacobian()
{
std::string line = " ";
for (int j = 0; j < nr_order_; j++)
line += sta::format("{:12}", dmp_param_index_strings[j]);
line += sta::format("{:>12}", dmp_param_index_strings[j]);
report_->reportLine(line);
line.clear();
for (int i = 0; i < nr_order_; i++) {
line.clear();
line += sta::format("{:4} ", dmp_func_index_strings[i]);
for (int j = 0; j < nr_order_; j++)
line += sta::format("{:12.3e} ", fjac_[i][j]);
@ -551,10 +551,10 @@ DmpAlg::loadDelaySlew(const Pin *,
// Use the driver thresholds and rely on thresholdAdjust to
// convert the delay and slew to the load's thresholds.
try {
if (debug_->check("dmp_ceff", 4))
showVl();
elmore_ = elmore;
p3_ = 1.0 / elmore;
if (debug_->check("dmp_ceff", 4))
showVl();
double t_lower = t0_;
double t_upper = vlCrossingUpperBound();
double load_delay = findVlCrossing(vth_, t_lower, t_upper);
@ -1189,9 +1189,9 @@ DmpZeroC2::init(const LibertyLibrary *drvr_library,
}
void
DmpZeroC2::gateDelaySlew( // Return values.
double &delay,
double &slew)
DmpZeroC2::gateDelaySlew(// Return values.
double &delay,
double &slew)
{
try {
findDriverParams(c1_);

34
dcalc/GraphDelayCalc.cc
View File

@ -411,27 +411,27 @@ GraphDelayCalc::seedDrvrSlew(Vertex *drvr_vertex,
for (const MinMax *min_max : MinMax::range()) {
for (const RiseFall *rf : RiseFall::range()) {
InputDrive *drive = nullptr;
if (network_->isTopLevelPort(drvr_pin)) {
Port *port = network_->port(drvr_pin);
if (network_->isTopLevelPort(drvr_pin)) {
Port *port = network_->port(drvr_pin);
drive = sdc->findInputDrive(port);
}
if (drive) {
const LibertyCell *drvr_cell;
const LibertyPort *from_port, *to_port;
float *from_slews;
}
if (drive) {
const LibertyCell *drvr_cell;
const LibertyPort *from_port, *to_port;
float *from_slews;
drive->driveCell(rf, 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, rf,
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, rf,
from_port, from_slews, to_port, scene, min_max);
}
else
}
else
seedNoDrvrCellSlew(drvr_vertex, drvr_pin, rf, drive, scene, min_max,
arc_delay_calc);
}
else
arc_delay_calc);
}
else
seedNoDrvrSlew(drvr_vertex, drvr_pin, rf, scene, min_max, arc_delay_calc);
}
}

4
liberty/TableModel.cc
View File

@ -116,7 +116,9 @@ GateTableModel::gateDelay(const Pvt *pvt,
drvr_slew = findValue(pvt, slew_models_->model(), in_slew, load_cap, 0.0);
else
drvr_slew = 0.0;
// Clip negative slews to zero.
// Clip negative delays and slews to zero.
if (gate_delay < 0.0)
gate_delay = 0.0;
if (drvr_slew < 0.0)
drvr_slew = 0.0;
}