4 files changed, 25 insertions, 23 deletions

diff --git a/src/opt/sim/sim.h b/src/opt/sim/sim.h
index 74c3c22f..963f0ad6 100644
--- a/src/opt/sim/sim.h
+++ b/src/opt/sim/sim.h
@@ -98,6 +98,7 @@ struct Sim_Man_t_
     Abc_Ntk_t *       pNtk;
     int               nInputs;
     int               nOutputs;
+    int               fLightweight;
     // internal simulation information
     int               nSimBits;      // the number of bits in simulation info
     int               nSimWords;     // the number of words in simulation info
@@ -172,7 +173,7 @@ struct Sim_Pat_t_
 extern Sym_Man_t *     Sym_ManStart( Abc_Ntk_t * pNtk, int fVerbose );
 extern void            Sym_ManStop( Sym_Man_t * p );
 extern void            Sym_ManPrintStats( Sym_Man_t * p );
-extern Sim_Man_t *     Sim_ManStart( Abc_Ntk_t * pNtk );
+extern Sim_Man_t *     Sim_ManStart( Abc_Ntk_t * pNtk, int fLightweight );
 extern void            Sim_ManStop( Sim_Man_t * p );
 extern void            Sim_ManPrintStats( Sim_Man_t * p );
 extern Sim_Pat_t *     Sim_ManPatAlloc( Sim_Man_t * p );
diff --git a/src/opt/sim/simMan.c b/src/opt/sim/simMan.c
index 3df8ac4b..a7d8251c 100644
--- a/src/opt/sim/simMan.c
+++ b/src/opt/sim/simMan.c
@@ -31,7 +31,7 @@
 
 /**Function*************************************************************
 
-  Synopsis    [Starts the simulatin manager.]
+  Synopsis    [Starts the simulation manager.]
 
   Description []
                
@@ -83,7 +83,7 @@ Sym_Man_t * Sym_ManStart( Abc_Ntk_t * pNtk, int fVerbose )
 
 /**Function*************************************************************
 
-  Synopsis    [Stops the simulatin manager.]
+  Synopsis    [Stops the simulation manager.]
 
   Description []
                
@@ -149,11 +149,9 @@ void Sym_ManPrintStats( Sym_Man_t * p )
 }
 
 
-
-
 /**Function*************************************************************
 
-  Synopsis    [Starts the simulatin manager.]
+  Synopsis    [Starts the simulation manager.]
 
   Description []
                
@@ -162,7 +160,7 @@ void Sym_ManPrintStats( Sym_Man_t * p )
   SeeAlso     []
 
 ***********************************************************************/
-Sim_Man_t * Sim_ManStart( Abc_Ntk_t * pNtk )
+Sim_Man_t * Sim_ManStart( Abc_Ntk_t * pNtk, int fLightweight )
 {
     Sim_Man_t * p;
     // start the manager
@@ -175,24 +173,27 @@ Sim_Man_t * Sim_ManStart( Abc_Ntk_t * pNtk )
     p->nSimBits   = 2048;
     p->nSimWords  = SIM_NUM_WORDS(p->nSimBits);
     p->vSim0      = Sim_UtilInfoAlloc( Abc_NtkObjNumMax(pNtk), p->nSimWords, 0 );
-    p->vSim1      = Sim_UtilInfoAlloc( Abc_NtkObjNumMax(pNtk), p->nSimWords, 0 );
-    // support information
-    p->nSuppBits  = Abc_NtkCiNum(pNtk);
-    p->nSuppWords = SIM_NUM_WORDS(p->nSuppBits);
-    p->vSuppStr   = Sim_ComputeStrSupp( pNtk );
-    p->vSuppFun   = Sim_UtilInfoAlloc( Abc_NtkCoNum(p->pNtk),  p->nSuppWords, 1 );
-    // other data
-    p->pMmPat     = Extra_MmFixedStart( sizeof(Sim_Pat_t) + p->nSuppWords * sizeof(unsigned) ); 
-    p->vFifo      = Vec_PtrAlloc( 100 );
-    p->vDiffs     = Vec_IntAlloc( 100 );
-    // allocate support targets (array of unresolved outputs for each input)
-    p->vSuppTargs = Vec_VecStart( p->nInputs );
+    p->fLightweight = fLightweight;
+    if (!p->fLightweight) {
+        p->vSim1      = Sim_UtilInfoAlloc( Abc_NtkObjNumMax(pNtk), p->nSimWords, 0 );
+        // support information
+        p->nSuppBits  = Abc_NtkCiNum(pNtk);
+        p->nSuppWords = SIM_NUM_WORDS(p->nSuppBits);
+        p->vSuppStr   = Sim_ComputeStrSupp( pNtk );
+        p->vSuppFun   = Sim_UtilInfoAlloc( Abc_NtkCoNum(p->pNtk),  p->nSuppWords, 1 );
+        // other data
+        p->pMmPat     = Extra_MmFixedStart( sizeof(Sim_Pat_t) + p->nSuppWords * sizeof(unsigned) ); 
+        p->vFifo      = Vec_PtrAlloc( 100 );
+        p->vDiffs     = Vec_IntAlloc( 100 );
+        // allocate support targets (array of unresolved outputs for each input)
+        p->vSuppTargs = Vec_VecStart( p->nInputs );
+    }
     return p;
 }
 
 /**Function*************************************************************
 
-  Synopsis    [Stops the simulatin manager.]
+  Synopsis    [Stops the simulation manager.]
 
   Description []
                
diff --git a/src/opt/sim/simSeq.c b/src/opt/sim/simSeq.c
index f6989bf7..ba6b54d9 100644
--- a/src/opt/sim/simSeq.c
+++ b/src/opt/sim/simSeq.c
@@ -53,7 +53,7 @@ Vec_Ptr_t * Sim_SimulateSeqRandom( Abc_Ntk_t * pNtk, int nFrames, int nWords )
     assert( Abc_NtkIsStrash(pNtk) );
     vInfo = Sim_UtilInfoAlloc( Abc_NtkObjNumMax(pNtk), nWords * nFrames, 0 );
     // set the constant data
-    pNode = Abc_AigConst1(pNtk->pManFunc);
+    pNode = Abc_NtkConst1(pNtk);
     Sim_UtilSetConst( Sim_SimInfoGet(vInfo,pNode), nWords * nFrames, 1 );
     // set the random PI data
     Abc_NtkForEachPi( pNtk, pNode, i )
@@ -94,7 +94,7 @@ Vec_Ptr_t * Sim_SimulateSeqModel( Abc_Ntk_t * pNtk, int nFrames, int * pModel )
     int i, k;
     vInfo = Sim_UtilInfoAlloc( Abc_NtkObjNumMax(pNtk), nFrames, 0 );
     // set the constant data
-    pNode = Abc_AigConst1(pNtk->pManFunc);
+    pNode = Abc_NtkConst1(pNtk);
     Sim_UtilSetConst( Sim_SimInfoGet(vInfo,pNode), nFrames, 1 );
     // set the random PI data
     Abc_NtkForEachPi( pNtk, pNode, i )
diff --git a/src/opt/sim/simSupp.c b/src/opt/sim/simSupp.c
index bd2db441..dac0e5cf 100644
--- a/src/opt/sim/simSupp.c
+++ b/src/opt/sim/simSupp.c
@@ -106,7 +106,7 @@ Vec_Ptr_t * Sim_ComputeFunSupp( Abc_Ntk_t * pNtk, int fVerbose )
     srand( 0xABC );
 
     // start the simulation manager
-    p = Sim_ManStart( pNtk );
+    p = Sim_ManStart( pNtk, 0 );
 
     // compute functional support using one round of random simulation
     Sim_UtilAssignRandom( p );