Several corner-case bugs in %read, &cec, and st.

src/aig/gia/giaDup.c

@@ -3860,9 +3860,18 @@ Gia_Man_t * Gia_ManDemiterToDual( Gia_Man_t * p )
         pObj->Value = Gia_ManAppendCi( pNew );
     Gia_ManForEachObjVec( vNodes, p, pObj, i )
         pObj->Value = Gia_ManAppendAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
+    pObj = Gia_ManCo(p, 0);
+    if ( Gia_ObjFanin0(pObj) == Gia_ManConst0(p) )
+    {
+        Gia_ManAppendCo( pNew, 0 );
+        Gia_ManAppendCo( pNew, Gia_ObjFaninC0(pObj) );
+    }
+    else
+    {
         Gia_ManSetPhase( p );
         Gia_ManForEachObjVec( vOrder, p, pObj, i )
             Gia_ManAppendCo( pNew, Abc_LitNotCond(pObj->Value, pObj->fPhase) );
+    }
     Vec_IntFree( vNodes );
     Vec_IntFree( vOrder );
     return pNew;

src/base/abc/abcFunc.c

@@ -810,7 +810,7 @@ int Abc_NtkSopToAig( Abc_Ntk_t * pNtk )
 {
     Abc_Obj_t * pNode;
     Hop_Man_t * pMan;
-    int i;
+    int i, Max;
 
     assert( Abc_NtkHasSop(pNtk) ); 
 
@@ -819,7 +819,8 @@ int Abc_NtkSopToAig( Abc_Ntk_t * pNtk )
 
     // start the functionality manager
     pMan = Hop_ManStart();
-    Hop_IthVar( pMan, Abc_NtkGetFaninMax(pNtk)-1 );
+    Max = Abc_NtkGetFaninMax(pNtk);
+    if ( Max ) Hop_IthVar( pMan, Max-1 );
 
     // convert each node from SOP to BDD
     Abc_NtkForEachNode( pNtk, pNode, i )

src/base/wlc/wlcReadVer.c

@@ -1265,10 +1265,10 @@ Wlc_Ntk_t * Wlc_ReadVer( char * pFileName )
     // derive topological order
     pNtk = Wlc_NtkDupDfs( p->pNtk );
     Wlc_NtkTransferNames( pNtk, p->pNtk );
+    pNtk->pSpec = Abc_UtilStrsav( pFileName );
 finish:
     Wlc_PrsPrintErrorMessage( p );
     Wlc_PrsStop( p );
-    pNtk->pSpec = Abc_UtilStrsav( pFileName );
     return pNtk;
 }