From 20efd75a326b7e58e30aeebc64b3b35236ec0da4 Mon Sep 17 00:00:00 2001
From: Jean-Paul Chaput <Jean-Paul.Chaput@lip6.fr>
Date: Thu, 15 Apr 2021 23:47:21 +0200
Subject: [PATCH] More accurate detection of zero-length segments.in
 AutoSegment::canReduce().

---
 anabatic/src/AnabaticEngine.cpp | 3 +++
 anabatic/src/AutoSegment.cpp    | 9 +++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/anabatic/src/AnabaticEngine.cpp b/anabatic/src/AnabaticEngine.cpp
index 2dcd6c77..c0e8088a 100644
--- a/anabatic/src/AnabaticEngine.cpp
+++ b/anabatic/src/AnabaticEngine.cpp
@@ -446,6 +446,7 @@ namespace Anabatic {
 
   void  AnabaticEngine::_gutAnabatic ()
   {
+  //DebugSession::open( 159, 160 );
     openSession();
 
     _flags.reset( Flags::DestroyBaseContact|Flags::DestroyBaseSegment );
@@ -469,6 +470,7 @@ namespace Anabatic {
       //if (isegment.second->bloatStackedStrap()) ++bloatedStraps;
       }
       sort( reduceds.begin(), reduceds.end() );
+      // cerr << "Reduced segment queue:" << endl;
       // for ( size_t i=0 ; i<reduceds.size() ; ++i ) {
       //   cerr << "| " << setw(3) << i
       //        << " " << reduceds[i].nonReduceds()
@@ -510,6 +512,7 @@ namespace Anabatic {
 
     exportExternalNets();
     Session::close();
+  //DebugSession::close();
   }
 
 
diff --git a/anabatic/src/AutoSegment.cpp b/anabatic/src/AutoSegment.cpp
index c5836a1a..b48216cc 100644
--- a/anabatic/src/AutoSegment.cpp
+++ b/anabatic/src/AutoSegment.cpp
@@ -1754,7 +1754,6 @@ namespace Anabatic {
     if (not isSpinTopOrBottom()) return false;
     if ((getDepth() == 1) and isSpinBottom()) return false;
     if ((flags & Flags::WithPerpands) and _reduceds) return false;
-    if ((flags & Flags::NullLength) and (getAnchoredLength() > 0)) return false;
 
     AutoContact* source = getAutoSource();
     AutoContact* target = getAutoTarget();
@@ -1768,6 +1767,9 @@ namespace Anabatic {
     // if (  source->isHTee() or source->isVTee()
     //    or target->isHTee() or target->isVTee() ) return false;
 
+    cdebug_log(159,0) << "  length:" << DbU::getValueString(getAnchoredLength()) << endl;
+    if (flags & Flags::NullLength) return (getAnchoredLength() == 0); 
+
     unsigned int perpandicularDepth = getDepth();
     if (isSpinBottom()) {
       if (perpandicularDepth > 0) --perpandicularDepth;
@@ -1776,9 +1778,8 @@ namespace Anabatic {
       if (perpandicularDepth >= Session::getDepth()) return false;
     } else
       return false;
-
-    cdebug_log(159,0) << "  length:" << DbU::getValueString(getAnchoredLength()) << endl;
-    if (getAnchoredLength() >= (Session::getPitch(perpandicularDepth) * 2)) return false;
+    
+    if (getAnchoredLength() >= Session::getPitch(perpandicularDepth) * 2) return false;
 
     return true;
   }