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drt: Bidirectional A* #6486

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drt: Bidirectional A* #6486

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d8bdede
drt: Bidirectional A*
kbieganski Dec 9, 2024
84e0d57
drt: Use Boost's hashmap for A*
kbieganski Jan 3, 2025
bf4cb1e
drt: Adjust tests
kbieganski Jan 10, 2025
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4 changes: 2 additions & 2 deletions etc/DependencyInstaller.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -66,9 +66,9 @@ _installCommonDev() {
pcreChecksum="37d2f77cfd411a3ddf1c64e1d72e43f7"
swigVersion=4.1.0
swigChecksum="794433378154eb61270a3ac127d9c5f3"
boostVersionBig=1.80
boostVersionBig=1.82
boostVersionSmall=${boostVersionBig}.0
boostChecksum="077f074743ea7b0cb49c6ed43953ae95"
boostChecksum="f7050f554a65f6a42ece221eaeec1660"
eigenVersion=3.4
cuddVersion=3.0.0
lemonVersion=1.3.1
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2 changes: 1 addition & 1 deletion src/drt/src/dr/FlexGridGraph.cpp
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Expand Up @@ -108,7 +108,7 @@ void FlexGridGraph::initGrids(const frLayerCoordTrackPatternMap& xMap,
srcs_.clear();
dsts_.clear();

prevDirs_.resize(capacity * 3, false);
prevDirs_.resize(capacity * 4, false);
srcs_.resize(capacity, false);
dsts_.resize(capacity, false);
guides_.clear();
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113 changes: 101 additions & 12 deletions src/drt/src/dr/FlexGridGraph.h
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Expand Up @@ -30,6 +30,7 @@

#include <boost/container/flat_map.hpp>
#include <boost/container/flat_set.hpp>
#include <boost/unordered/unordered_flat_map.hpp>
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warning: 'boost/unordered/unordered_flat_map.hpp' file not found [clang-diagnostic-error]

#include <boost/unordered/unordered_flat_map.hpp>
         ^

#include <cstdint>
#include <cstring>
#include <fstream>
Expand All @@ -45,6 +46,11 @@
#include "global.h"

namespace drt {
enum class ExpandDir
{
FORWARD,
BACKWARD,
};

using frLayerCoordTrackPatternMap = boost::container::
flat_map<frLayerNum, boost::container::flat_map<frCoord, frTrackPattern*>>;
Expand Down Expand Up @@ -112,6 +118,26 @@ class FlexGridGraph
return nodes_[getIdx(x, y, z)].hasGridCostUp;
}

void setPathCost(frMIdx x, frMIdx y, frMIdx z, frCost in)
{
path_costs_[getIdx(x, y, z)] = in;
}
void setPathCost(const FlexMazeIdx& mIdx, frCost in)
{
path_costs_[getIdx(mIdx.x(), mIdx.y(), mIdx.z())] = in;
}
frCost getPathCost(frMIdx x, frMIdx y, frMIdx z)
{
return path_costs_[getIdx(x, y, z)];
}
bool isClosed(frMIdx x, frMIdx y, frMIdx z, ExpandDir expandDir) const
{
auto baseIdx = 4 * getIdx(x, y, z);
return getPrevAstarNodeDir({x, y, z}) != frDirEnum::UNKNOWN
&& (prevDirs_[baseIdx + 3] ? expandDir == ExpandDir::FORWARD
: expandDir == ExpandDir::BACKWARD);
}

void getBBox(Rect& in) const
{
if (!xCoords_.empty() && !yCoords_.empty()) {
Expand Down Expand Up @@ -946,6 +972,11 @@ class FlexGridGraph
void resetPrevNodeDir();
void resetSrc();
void resetDst();
void traceBackPath(std::vector<FlexMazeIdx>& connComps,
std::vector<FlexMazeIdx>& path,
FlexMazeIdx& ccMazeIdx1,
FlexMazeIdx& ccMazeIdx2,
ExpandDir expandDir);
bool search(std::vector<FlexMazeIdx>& connComps,
drPin* nextPin,
std::vector<FlexMazeIdx>& path,
Expand Down Expand Up @@ -989,8 +1020,10 @@ class FlexGridGraph
yCoords_.shrink_to_fit();
yCoords_.clear();
yCoords_.shrink_to_fit();
wavefront_.cleanup();
wavefront_.fit();
wavefrontForward_.cleanup();
wavefrontForward_.fit();
wavefrontBackward_.cleanup();
wavefrontBackward_.fit();
}

void printNode(frMIdx x, frMIdx y, frMIdx z)
Expand Down Expand Up @@ -1095,6 +1128,7 @@ class FlexGridGraph
std::vector<bool> srcs_;
std::vector<bool> dsts_;
std::vector<bool> guides_;
boost::unordered_flat_map<frMIdx, frCost> path_costs_;
frVector<frCoord> xCoords_;
frVector<frCoord> yCoords_;
frVector<frLayerNum> zCoords_;
Expand All @@ -1105,7 +1139,15 @@ class FlexGridGraph
frUInt4 ggMarkerCost_ = 0;
frUInt4 ggFixedShapeCost_ = 0;
// temporary variables
FlexWavefront wavefront_;
FlexWavefront wavefrontForward_;
FlexWavefront wavefrontBackward_;
struct MeetingPoint
{
FlexWavefrontGrid wavefront;
ExpandDir wavefrontDir;
frCost mazeCost;
};
std::optional<MeetingPoint> meetingPoint_;
const std::vector<std::pair<frCoord, frCoord>>* halfViaEncArea_
= nullptr; // std::pair<layer1area, layer2area>
// ndr related
Expand All @@ -1122,32 +1164,39 @@ class FlexGridGraph
void printExpansion(const FlexWavefrontGrid& currGrid,
const std::string& keyword);
// unsafe access, no idx check
void setPrevAstarNodeDir(frMIdx x, frMIdx y, frMIdx z, frDirEnum dir)
void setPrevAstarNodeDir(frMIdx x,
frMIdx y,
frMIdx z,
ExpandDir expandDir,
frDirEnum dir)
{
auto baseIdx = 3 * getIdx(x, y, z);
auto baseIdx = 4 * getIdx(x, y, z);
prevDirs_[baseIdx] = ((uint16_t) dir >> 2) & 1;
prevDirs_[baseIdx + 1] = ((uint16_t) dir >> 1) & 1;
prevDirs_[baseIdx + 2] = ((uint16_t) dir) & 1;
prevDirs_[baseIdx + 3] = expandDir == ExpandDir::FORWARD;
}

// unsafe access, no check
frDirEnum getPrevAstarNodeDir(const FlexMazeIdx& idx) const
{
auto baseIdx = 3 * getIdx(idx.x(), idx.y(), idx.z());
auto baseIdx = 4 * getIdx(idx.x(), idx.y(), idx.z());
return (frDirEnum) (((uint16_t) (prevDirs_[baseIdx]) << 2)
+ ((uint16_t) (prevDirs_[baseIdx + 1]) << 1)
+ ((uint16_t) (prevDirs_[baseIdx + 2]) << 0));
}

// unsafe access, no check
bool isSrc(frMIdx x, frMIdx y, frMIdx z) const
bool isSrc(frMIdx x, frMIdx y, frMIdx z, ExpandDir expandDir) const
{
return srcs_[getIdx(x, y, z)];
auto& srcs = expandDir == ExpandDir::FORWARD ? srcs_ : dsts_;
return srcs[getIdx(x, y, z)];
}
// unsafe access, no check
bool isDst(frMIdx x, frMIdx y, frMIdx z) const
bool isDst(frMIdx x, frMIdx y, frMIdx z, ExpandDir expandDir) const
{
return dsts_[getIdx(x, y, z)];
auto& dsts = expandDir == ExpandDir::FORWARD ? dsts_ : srcs_;
return dsts[getIdx(x, y, z)];
}
bool isDst(frMIdx x, frMIdx y, frMIdx z, frDirEnum dir) const
{
Expand Down Expand Up @@ -1307,20 +1356,31 @@ class FlexGridGraph
std::vector<FlexMazeIdx>& path,
std::vector<FlexMazeIdx>& root,
FlexMazeIdx& ccMazeIdx1,
FlexMazeIdx& ccMazeIdx2) const;
FlexMazeIdx& ccMazeIdx2,
ExpandDir expandDir) const;
void traceBackPath(const FlexMazeIdx& currGrid,
std::vector<FlexMazeIdx>& path,
std::vector<FlexMazeIdx>& root,
FlexMazeIdx& ccMazeIdx1,
FlexMazeIdx& ccMazeIdx2,
ExpandDir expandDir) const;
void expandWavefront(FlexWavefrontGrid& currGrid,
const FlexMazeIdx& dstMazeIdx1,
const FlexMazeIdx& dstMazeIdx2,
const Point& centerPt,
ExpandDir expandDir,
bool route_with_jumpers);
bool isExpandable(const FlexWavefrontGrid& currGrid, frDirEnum dir) const;
bool isExpandable(const FlexWavefrontGrid& currGrid,
frDirEnum dir,
ExpandDir expandDir) const;
FlexMazeIdx getTailIdx(const FlexMazeIdx& currIdx,
const FlexWavefrontGrid& currGrid) const;
void expand(FlexWavefrontGrid& currGrid,
const frDirEnum& dir,
const FlexMazeIdx& dstMazeIdx1,
const FlexMazeIdx& dstMazeIdx2,
const Point& centerPt,
ExpandDir expandDir,
bool route_with_jumpers);
bool hasAlignedUpDefTrack(
frLayerNum layerNum,
Expand All @@ -1332,6 +1392,35 @@ class FlexGridGraph
bool hasOutOfDieViol(frMIdx x, frMIdx y, frMIdx z);
bool isWorkerBorder(frMIdx v, bool isVert);

template <class Archive>
void serialize(Archive& ar, const unsigned int version)
{
// The wavefront should always be empty here so we don't need to
// serialize it.
if (!wavefrontForward_.empty() || !wavefrontBackward_.empty()) {
throw std::logic_error("don't serialize non-empty wavefront");
}
if (is_loading(ar)) {
tech_ = ar.getDesign()->getTech();
}
(ar) & drWorker_;
(ar) & nodes_;
(ar) & prevDirs_;
(ar) & srcs_;
(ar) & dsts_;
(ar) & guides_;
(ar) & xCoords_;
(ar) & yCoords_;
(ar) & zCoords_;
(ar) & zHeights_;
(ar) & layerRouteDirections_;
(ar) & dieBox_;
(ar) & ggDRCCost_;
(ar) & ggMarkerCost_;
(ar) & halfViaEncArea_;
(ar) & ap_locs_;
}
friend class boost::serialization::access;
friend class FlexDRWorker;
};

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