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coriolis
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Avoid placement issues on small designs by limiting cell bloat based on row size

This commit is contained in:
Gabriel Gouvine 2023-06-29 15:17:02 +02:00
parent e084c1e672
commit b7698e7500
1 changed files with 10 additions and 9 deletions
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19
etesian/src/EtesianEngine.cpp
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@ -750,6 +750,11 @@ namespace Etesian {
}
}
}
_surface = new coloquinte::Rectangle( (int)(topAb.getXMin() / hpitch)
, (int)(topAb.getXMax() / hpitch)
, (int)(topAb.getYMin() / vpitch)
, (int)(topAb.getYMax() / vpitch)
);
for ( Occurrence occurrence : getCell()->getTerminalNetlistInstanceOccurrences(getBlockInstance()) ) {
++instancesNb;
@ -844,9 +849,10 @@ namespace Etesian {
}
}
// Compute the space margin from the row length computed earlier
double spaceFactor = (1.0 - getDensityVariation()) * totalLength / usedLength;
double bloatFactor = std::max(1.0, spaceFactor);
// Compute a bloat factor to be reach 1 - densityVariation density
double bloatFactor = std::max(1.0, (1.0 - getDensityVariation()) * totalLength / usedLength);
// Limit the maximum size of cells after bloat to avoid placement issues
int maxBloatSize = _surface->width() / 8;
if (bloatFactor != 1.0) {
ostringstream bf;
bf << fixed << setprecision(2) << bloatFactor << "%";
@ -886,7 +892,7 @@ namespace Etesian {
++xsize;
// Take bloat into account to compute the size
xsize *= bloatFactor;
xsize = std::max(xsize, std::min(maxBloatSize, (int) (xsize * bloatFactor)));
cellX[instanceId] = xpos;
cellY[instanceId] = ypos;
@ -1032,11 +1038,6 @@ namespace Etesian {
if (_bloatCells.getSelected()->getName() != "disabled")
cmess2 << stdCellSizes.toString(1) << endl;
_surface = new coloquinte::Rectangle( (int)(topAb.getXMin() / hpitch)
, (int)(topAb.getXMax() / hpitch)
, (int)(topAb.getYMin() / vpitch)
, (int)(topAb.getYMax() / vpitch)
);
_circuit->setupRows(*_surface, rowHeight);
_circuit->check();
_placementLB = new coloquinte::PlacementSolution ();