1 files changed, 134 insertions, 0 deletions
diff --git a/src/aig/ssw/sswAig.c b/src/aig/ssw/sswAig.c
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+++ b/src/aig/ssw/sswAig.c
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+/**CFile****************************************************************
+
+  FileName    [sswAig.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Inductive prover with constraints.]
+
+  Synopsis    [AIG manipulation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - September 1, 2008.]
+
+  Revision    [$Id: sswAig.c,v 1.00 2008/09/01 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "sswInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+
+/**Function*************************************************************
+
+  Synopsis    [Performs speculative reduction for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Ssw_FramesConstrainNode( Ssw_Man_t * p, Aig_Man_t * pFrames, Aig_Man_t * pAig, Aig_Obj_t * pObj, int iFrame )
+{
+    Aig_Obj_t * pObjNew, * pObjNew2, * pObjRepr, * pObjReprNew;
+    // skip nodes without representative
+    if ( (pObjRepr = Aig_ObjRepr(pAig, pObj)) == NULL )
+        return;
+    p->nConstrTotal++;
+    assert( pObjRepr->Id < pObj->Id );
+    // get the new node 
+    pObjNew = Ssw_ObjFraig( p, pObj, iFrame );
+    // get the new node of the representative
+    pObjReprNew = Ssw_ObjFraig( p, pObjRepr, iFrame );
+    // if this is the same node, no need to add constraints
+    if ( Aig_Regular(pObjNew) == Aig_Regular(pObjReprNew) )
+        return;
+    p->nConstrReduced++;
+    // these are different nodes - perform speculative reduction
+    pObjNew2 = Aig_NotCond( pObjReprNew, pObj->fPhase ^ pObjRepr->fPhase );
+    // set the new node
+    Ssw_ObjSetFraig( p, pObj, iFrame, pObjNew2 );
+    // add the constraint
+    Aig_ObjCreatePo( pFrames, Aig_Regular(pObjNew) );
+    Aig_ObjCreatePo( pFrames, Aig_Regular(pObjReprNew) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares the inductive case with speculative reduction.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Ssw_FramesWithClasses( Ssw_Man_t * p )
+{
+    Aig_Man_t * pFrames;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo, * pObjNew;
+    int i, k, f;
+    assert( p->pFrames == NULL );
+    assert( Aig_ManRegNum(p->pAig) > 0 );
+    assert( Aig_ManRegNum(p->pAig) < Aig_ManPiNum(p->pAig) );
+
+    // start the fraig package
+    pFrames = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * p->nFrames );
+    // create latches for the first frame
+    Saig_ManForEachLo( p->pAig, pObj, i )
+        Ssw_ObjSetFraig( p, pObj, 0, Aig_ObjCreatePi(pFrames) );
+    // create PI nodes for the frames
+    for ( f = 0; f < p->pPars->nFramesK; f++ )
+        Aig_ManForEachPiSeq( p->pAig, pObj, i )
+            Ssw_ObjSetFraig( p, pObj, f, Aig_ObjCreatePi(pFrames) );
+    // map constant nodes
+    for ( f = 0; f < p->pPars->nFramesK; f++ )
+        Ssw_ObjSetFraig( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(pFrames) );
+
+    // add timeframes
+    p->nConstrTotal = p->nConstrReduced = 0;
+    for ( f = 0; f < p->pPars->nFramesK; f++ )
+    {
+        // set the constraints on the latch outputs
+        Aig_ManForEachLoSeq( p->pAig, pObj, i )
+            Ssw_FramesConstrainNode( p, pFrames, p->pAig, pObj, f );
+        // add internal nodes of this frame
+        Aig_ManForEachNode( p->pAig, pObj, i )
+        {
+            pObjNew = Aig_And( pFrames, Ssw_ObjChild0Fra(p, pObj, f), Ssw_ObjChild1Fra(p, pObj, f) );
+            Ssw_ObjSetFraig( p, pObj, f, pObjNew );
+            Ssw_FramesConstrainNode( p, pFrames, p->pAig, pObj, f );
+        }
+        // transfer latch input to the latch outputs 
+        Saig_ManForEachLiLo( p->pAig, pObjLi, pObjLo, k )
+            Ssw_ObjSetFraig( p, pObjLo, f+1, Ssw_ObjChild0Fra(p, pObjLi,f) );
+    }
+    // add the POs for the latch outputs of the last frame
+    Saig_ManForEachLo( p->pAig, pObj, i )
+        Aig_ObjCreatePo( pFrames, Ssw_ObjFraig( p, pObj, p->pPars->nFramesK ) );
+
+    // remove dangling nodes
+    Aig_ManCleanup( pFrames );
+    // make sure the satisfying assignment is node assigned
+    assert( pFrames->pData == NULL );
+    return pFrames;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+