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pdn: over pad connections balancing #11213

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Merged
gadfort merged 5 commits into from
Aug 24, 2026
Merged

pdn: over pad connections balancing #11213

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2c7d7af
pad: initial testcase from https://github.com/The-OpenROAD-Project/Op…
gadfort Aug 23, 2026
f832f86
pad: group together direct pad connections so we can attempt to balan…
gadfort Aug 23, 2026
cf22bc5
pdn: fix logger and gemini comment
gadfort Aug 23, 2026
9b4744c
Merge remote-tracking branch 'origin/master' into pad-over-balance
gadfort Aug 24, 2026
30c17b4
pdn: use auto for long type net_map
gadfort Aug 24, 2026
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8 changes: 7 additions & 1 deletion src/pdn/src/grid.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,10 @@ void Grid::makeShapes(const Shape::ShapeTreeMap& global_shapes,
local_obstructions,
allow_repair_channels_,
domain_->getPDNGen()->getDebugRenderer());

if (logger->debugCheck(utl::PDN, "Pad", 1)) {
PadDirectConnectionStraps::reportConnectionBalance(getGridComponents());
}
}

void Grid::makeRoutingObstructions(odb::dbBlock* block) const
Expand Down Expand Up @@ -1322,9 +1326,11 @@ odb::Rect CoreGrid::getDomainBoundary() const
void CoreGrid::setupDirectConnect(
const std::vector<odb::dbTechLayer*>& connect_pad_layers)
{
auto net_map = std::make_shared<odb::PtrMap<odb::dbNet, int>>();
std::vector<PadDirectConnectionStraps*> straps;
// look for pads that need to be connected
for (auto* net : getNets()) {
(*net_map)[net] = 0;
std::vector<odb::dbITerm*> iterms;
for (auto* iterm : net->getITerms()) {
auto* inst = iterm->getInst();
Expand All @@ -1341,7 +1347,7 @@ void CoreGrid::setupDirectConnect(

for (auto* iterm : iterms) {
auto pad_connect = std::make_unique<PadDirectConnectionStraps>(
this, iterm, connect_pad_layers);
this, iterm, connect_pad_layers, net_map);
if (pad_connect->canConnect()) {
straps.push_back(pad_connect.get());
addStrap(std::move(pad_connect));
Expand Down
4 changes: 2 additions & 2 deletions src/pdn/src/grid_component.h
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Original file line number Diff line number Diff line change
Expand Up @@ -47,8 +47,8 @@ class GridComponent
Grid* getGrid() const { return grid_; }
VoltageDomain* getDomain() const;

bool make(Shape::ShapeTreeMap& shapes,
Shape::ObstructionTreeMap& obstructions);
virtual bool make(Shape::ShapeTreeMap& shapes,
Shape::ObstructionTreeMap& obstructions);

virtual void makeShapes(const Shape::ShapeTreeMap& other_shapes) = 0;
virtual bool refineShapes(Shape::ShapeTreeMap& all_shapes,
Expand Down
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