From 6205eaaee3a840dd076f9baaac67720d85d6a680 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Thu, 13 Mar 2008 08:01:00 -0700
Subject: Version abc80313

---
 src/base/abci/abcIf.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

(limited to 'src/base/abci/abcIf.c')

diff --git a/src/base/abci/abcIf.c b/src/base/abci/abcIf.c
index bf351a47..a20925b2 100644
--- a/src/base/abci/abcIf.c
+++ b/src/base/abci/abcIf.c
@@ -34,6 +34,7 @@ static Hop_Obj_t * Abc_NodeIfToHop( Hop_Man_t * pHopMan, If_Man_t * pIfMan, If_O
 static Vec_Ptr_t * Abc_NtkFindGoodOrder( Abc_Ntk_t * pNtk );
 
 extern void Abc_NtkBddReorder( Abc_Ntk_t * pNtk, int fVerbose );
+extern void Abc_NtkBidecResyn( Abc_Ntk_t * pNtk );
  
 ////////////////////////////////////////////////////////////////////////
 ///                     FUNCTION DEFINITIONS                         ///
@@ -84,6 +85,8 @@ Abc_Ntk_t * Abc_NtkIf( Abc_Ntk_t * pNtk, If_Par_t * pPars )
     if ( pNtkNew == NULL )
         return NULL;
     If_ManStop( pIfMan );
+    if ( pPars->fBidec && pPars->nLutSize <= 8 )
+        Abc_NtkBidecResyn( pNtkNew );
 
     // duplicate EXDC
     if ( pNtk->pExdc )
@@ -309,7 +312,9 @@ Abc_Obj_t * Abc_NodeFromIf_rec( Abc_Ntk_t * pNtkNew, If_Man_t * pIfMan, If_Obj_t
             Abc_NodeComplement( pNodeNew );
     }
     else
+    {
         pNodeNew->pData = Abc_NodeIfToHop( pNtkNew->pManFunc, pIfMan, pIfObj );
+    }
     If_ObjSetCopy( pIfObj, pNodeNew );
     return pNodeNew;
 }
@@ -545,6 +550,88 @@ Vec_Ptr_t * Abc_NtkFindGoodOrder( Abc_Ntk_t * pNtk )
     return vNodes;
 }
 
+
+#include "bdc.h"
+#include "bdcInt.h"
+
+static inline Hop_Obj_t * Bdc_FunCopyHop( Bdc_Fun_t * pObj )  { return Hop_NotCond( Bdc_Regular(pObj)->pCopy, Bdc_IsComplement(pObj) );  }
+
+/**Function*************************************************************
+
+  Synopsis    [Resynthesizes nodes using bi-decomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Abc_NodeIfNodeResyn( Bdc_Man_t * p, Hop_Man_t * pHop, Hop_Obj_t * pRoot, int nVars, Vec_Int_t * vTruth )
+{
+    unsigned * pTruth;
+    Bdc_Fun_t * pFunc;
+    int i;
+    // derive truth table
+    pTruth = Abc_ConvertAigToTruth( pHop, Hop_Regular(pRoot), nVars, vTruth, 0 );
+    if ( Hop_IsComplement(pRoot) )
+        Extra_TruthNot( pTruth, pTruth, nVars );
+    // decompose truth table
+    Bdc_ManDecompose( p, pTruth, NULL, nVars, NULL, 1000 );
+    // convert back into HOP
+    Bdc_FunWithId( p, 0 )->pCopy = Hop_ManConst1( pHop );
+    for ( i = 0; i < nVars; i++ )
+        Bdc_FunWithId( p, i+1 )->pCopy = Hop_ManPi( pHop, i );
+    for ( i = nVars + 1; i < p->nNodes; i++ )
+    {
+        pFunc = Bdc_FunWithId( p, i );
+        pFunc->pCopy = Hop_And( pHop, Bdc_FunCopyHop(pFunc->pFan0), Bdc_FunCopyHop(pFunc->pFan1) );
+    }
+    return Bdc_FunCopyHop(p->pRoot);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Resynthesizes nodes using bi-decomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_NtkBidecResyn( Abc_Ntk_t * pNtk )
+{
+    Bdc_Par_t Pars = {0}, * pPars = &Pars;
+    Bdc_Man_t * p;
+    Abc_Obj_t * pObj;
+    Vec_Int_t * vTruth;
+    int i, nGainTotal = 0, nNodes1, nNodes2;
+    int clk = clock();
+    pPars->nVarsMax = Abc_NtkGetFaninMax( pNtk );
+    if ( pPars->nVarsMax > 8 )
+    {
+        printf( "Resynthesis is not performed.\n" );
+        return;
+    }
+    vTruth = Vec_IntAlloc( 0 );
+    p = Bdc_ManAlloc( pPars );
+    Abc_NtkForEachNode( pNtk, pObj, i )
+    {
+        nNodes1 = Hop_DagSize(pObj->pData);
+        pObj->pData = Abc_NodeIfNodeResyn( p, pNtk->pManFunc, pObj->pData, Abc_ObjFaninNum(pObj), vTruth );
+        nNodes2 = Hop_DagSize(pObj->pData);
+        nGainTotal += nNodes1 - nNodes2;
+    }
+//    printf( "LUTs = %d.  Total gain in AIG nodes = %d.  ", Abc_NtkNodeNum(pNtk), nGainTotal );
+//    PRT( "Time", clock() - clk );
+    Bdc_ManFree( p );
+    Vec_IntFree( vTruth );
+}
+
+
+
 ////////////////////////////////////////////////////////////////////////
 ///                       END OF FILE                                ///
 ////////////////////////////////////////////////////////////////////////
-- 
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