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More accurate detection of small metal srips for minimum area. 

* Change: In AutoSegment::isMiddlestack(), we where previously only
    detecting (turn+turn) or (turn+terminal) topologies. This was
    too restrictive. Added (terminal+XTee) when the tee is perpandicular
    to the segment, for example horizontal + VTee.
      Fix minimal area DRC error in METAL2 for TSMC.
This commit is contained in:
Jean-Paul Chaput 2021-04-07 14:50:42 +02:00
parent e6f18a95d3
commit a2525f2260
1 changed files with 29 additions and 14 deletions
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27
anabatic/src/AutoSegment.cpp
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@ -1608,23 +1608,38 @@ namespace Anabatic {
if (isGlobal() or isNonPref()) return false; if (isGlobal() or isNonPref()) return false;
AutoContact* source = getAutoSource(); AutoContact* source = getAutoSource();
AutoContact* target = getAutoTarget(); AutoContact* target = getAutoTarget();
if (not source or not target) return false; if (not source or not target) {
if (isSpinTopOrBottom()) return false; cdebug_log(149,0) << "| false, missing source or target (in creation?). " << endl;
if (not source->isTurn() and not source->isTerminal()) return false; return false;
if (not target->isTurn() and not target->isTerminal()) return false; }
if (isSpinTopOrBottom()) {
cdebug_log(149,0) << "| false, neither spin top nor bottom. " << endl;
return false;
}
if (not (source->isTerminal() xor target->isTerminal())) {
if (source->isTerminal() and target->isTerminal()) {
cdebug_log(149,0) << "| false, source & target are terminals. " << endl;
return false;
}
if (source->isTurn()) { if (source->isTurn()) {
AutoSegment* perpandicular = source->getPerpandicular( this ); AutoSegment* perpandicular = source->getPerpandicular( this );
if (perpandicular->isNonPref() and (perpandicular->getAnchoredLength() != 0)) { if (perpandicular->isNonPref() and (perpandicular->getAnchoredLength() != 0)) {
cdebug_log(149,0) << "| false, perpandicular is non-pref and non-zero. " << this << endl; cdebug_log(149,0) << "| false, perpandicular is non-pref and non-zero. " << this << endl;
return false; return false;
} }
} } else if (target->isTurn()) {
if (target->isTurn()) {
AutoSegment* perpandicular = target->getPerpandicular( this ); AutoSegment* perpandicular = target->getPerpandicular( this );
if (perpandicular->isNonPref() and (perpandicular->getAnchoredLength() != 0)) { if (perpandicular->isNonPref() and (perpandicular->getAnchoredLength() != 0)) {
cdebug_log(149,0) << "| false, perpandicular is non-pref and non-zero. " << this << endl; cdebug_log(149,0) << "| false, perpandicular is non-pref and non-zero. " << this << endl;
return false; return false;
} }
} else if ((source->isHTee() or target->isHTee()) and isHorizontal()) {
cdebug_log(149,0) << "| false, S/T HTee and horizontal. " << this << endl;
return false;
} else if ((source->isVTee() or target->isVTee()) and isVertical()) {
cdebug_log(149,0) << "| false, S/T VTee and vertical. " << this << endl;
return false;
}
} }
cdebug_log(149,0) << " Middle stack or terminal bound." << endl; cdebug_log(149,0) << " Middle stack or terminal bound." << endl;
return true; return true;