Generation of dual-rail miter.

src/aig/saig/saigDual.c

+/**CFile****************************************************************
+
+  FileName    [saigDual.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Sequential AIG package.]
+
+  Synopsis    [Various duplication procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: saigDual.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "saig.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static inline void        Saig_ObjSetDual( Vec_Ptr_t * vCopies, int Id, int fPos, Aig_Obj_t * pItem ) { Vec_PtrWriteEntry( vCopies, 2*Id+fPos, pItem );         }
+static inline Aig_Obj_t * Saig_ObjDual( Vec_Ptr_t * vCopies, int Id, int fPos )                       { return (Aig_Obj_t *)Vec_PtrEntry( vCopies, 2*Id+fPos ); }
+
+static inline void        Saig_ObjDualFanin( Aig_Man_t * pAigNew, Vec_Ptr_t * vCopies, Aig_Obj_t * pObj, int iFanin, Aig_Obj_t ** ppRes0, Aig_Obj_t ** ppRes1 ) {
+
+    Aig_Obj_t * pTemp0, * pTemp1, * pCare;
+    int fCompl;
+    assert( iFanin == 0 || iFanin == 1 );
+    if ( iFanin == 0 )
+    {
+        pTemp0 = Saig_ObjDual( vCopies, Aig_ObjFaninId0(pObj), 0 );
+        pTemp1 = Saig_ObjDual( vCopies, Aig_ObjFaninId0(pObj), 1 );
+        fCompl = Aig_ObjFaninC0( pObj );
+    }
+    else
+    {
+        pTemp0 = Saig_ObjDual( vCopies, Aig_ObjFaninId1(pObj), 0 );
+        pTemp1 = Saig_ObjDual( vCopies, Aig_ObjFaninId1(pObj), 1 );
+        fCompl = Aig_ObjFaninC1( pObj );
+    }
+    if ( fCompl )
+    {
+        pCare   = Aig_Or( pAigNew, pTemp0, pTemp1 );
+        *ppRes0 = Aig_And( pAigNew, pTemp1, pCare );
+        *ppRes1 = Aig_And( pAigNew, pTemp0, pCare );
+    }
+    else
+    {
+        *ppRes0 = pTemp0;
+        *ppRes1 = pTemp1;
+    }
+}
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Transforms sequential AIG into dual-rail miter.]
+
+  Description [Transforms sequential AIG into a miter encoding ternary
+  problem formulated as follows "none of the POs has a ternary value".
+  Interprets the first nDualPis as having ternary value.  Sets flops
+  to have ternary intial value when fDualFfs is set to 1.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Saig_ManDupDual( Aig_Man_t * pAig, int nDualPis, int fDualFfs, int fMiterFfs, int fComplPo )
+{
+    Vec_Ptr_t * vCopies;
+    Aig_Man_t * pAigNew;
+    Aig_Obj_t * pObj, * pTemp0, * pTemp1, * pTemp2, * pTemp3, * pCare, * pMiter;
+    int i;
+    assert( Saig_ManPoNum(pAig) > 0 );
+    assert( nDualPis >= 0 && nDualPis <= Saig_ManPiNum(pAig) );
+    vCopies = Vec_PtrStart( 2*Aig_ManObjNum(pAig) );
+    // start the new manager
+    pAigNew = Aig_ManStart( Aig_ManNodeNum(pAig) );
+    pAigNew->pName = Abc_UtilStrsav( pAig->pName );
+    // map the constant node
+    Saig_ObjSetDual( vCopies, 0, 0, Aig_ManConst0(pAigNew) );
+    Saig_ObjSetDual( vCopies, 0, 1, Aig_ManConst1(pAigNew) );
+    // create variables for PIs
+    Aig_ManForEachPi( pAig, pObj, i )
+    {
+        if ( i < nDualPis )
+        {
+            pTemp0 = Aig_ObjCreatePi( pAigNew );
+            pTemp1 = Aig_ObjCreatePi( pAigNew );
+        }
+        else if ( i < Saig_ManPiNum(pAig) )
+        {
+            pTemp1 = Aig_ObjCreatePi( pAigNew );
+            pTemp0 = Aig_Not( pTemp1 );
+        }
+        else
+        {
+            pTemp0 = Aig_ObjCreatePi( pAigNew );
+            pTemp1 = Aig_ObjCreatePi( pAigNew );
+            pTemp0 = Aig_NotCond( pTemp0, !fDualFfs );
+        }
+        Saig_ObjSetDual( vCopies, Aig_ObjId(pObj), 0, Aig_And(pAigNew, pTemp0, Aig_Not(pTemp1)) );
+        Saig_ObjSetDual( vCopies, Aig_ObjId(pObj), 1, Aig_And(pAigNew, pTemp1, Aig_Not(pTemp0)) );
+    }
+    // create internal nodes
+    Aig_ManForEachNode( pAig, pObj, i )
+    {
+        Saig_ObjDualFanin( pAigNew, vCopies, pObj, 0, &pTemp0, &pTemp1 );
+        Saig_ObjDualFanin( pAigNew, vCopies, pObj, 1, &pTemp2, &pTemp3 );
+        Saig_ObjSetDual( vCopies, Aig_ObjId(pObj), 0, Aig_Or (pAigNew, pTemp0, pTemp2) );
+        Saig_ObjSetDual( vCopies, Aig_ObjId(pObj), 1, Aig_And(pAigNew, pTemp1, pTemp3) );
+    }
+    // create miter and flops
+    pMiter = Aig_ManConst0(pAigNew);
+    if ( fMiterFfs )
+    {
+        Saig_ManForEachLi( pAig, pObj, i )
+        {
+            Saig_ObjDualFanin( pAigNew, vCopies, pObj, 0, &pTemp0, &pTemp1 );
+            pCare  = Aig_Or( pAigNew, pTemp0, pTemp1 );
+            pMiter = Aig_Or( pAigNew, pMiter, Aig_Not(pCare) );
+        }
+    }
+    else
+    {
+        Saig_ManForEachPo( pAig, pObj, i )
+        {
+            Saig_ObjDualFanin( pAigNew, vCopies, pObj, 0, &pTemp0, &pTemp1 );
+            pCare  = Aig_Or( pAigNew, pTemp0, pTemp1 );
+            pMiter = Aig_Or( pAigNew, pMiter, Aig_Not(pCare) );
+        }
+    }
+    // create PO
+    pMiter = Aig_NotCond( pMiter, fComplPo );
+    Aig_ObjCreatePo( pAigNew, pMiter );
+    // create flops
+    Saig_ManForEachLi( pAig, pObj, i )
+    {
+        Saig_ObjDualFanin( pAigNew, vCopies, pObj, 0, &pTemp0, &pTemp1 );
+        pTemp0 = Aig_NotCond( pTemp0, !fDualFfs );
+        Aig_ObjCreatePo( pAigNew, pTemp0 );
+        Aig_ObjCreatePo( pAigNew, pTemp1 );
+    }
+    // set the flops
+    Aig_ManSetRegNum( pAigNew, 2 * Aig_ManRegNum(pAig) );
+    Aig_ManCleanup( pAigNew );
+    Vec_PtrFree( vCopies );
+    return pAigNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transforms sequential AIG to block the PO for N cycles.]
+
+  Description [This procedure should be applied to a safety property 
+  miter to make the propetry 'true' (const 0) during the first N cycles.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Saig_ManBlockPo( Aig_Man_t * pAig, int nCycles )
+{
+    Aig_Obj_t * pObj, * pCond, * pPrev;
+    int i;
+    assert( nCycles > 0 );
+    // add N flops (assuming 1-hot encoding of cycles)
+    pPrev = Aig_ManConst1(pAig);
+    pCond = Aig_ManConst1(pAig);
+    for ( i = 0; i < nCycles; i++ )
+    {
+        Aig_ObjCreatePo( pAig, pPrev );
+        pPrev = Aig_ObjCreatePi( pAig );
+        pCond = Aig_And( pAig, pCond, pPrev );
+    }
+    // update the POs
+    Saig_ManForEachPo( pAig, pObj, i )
+    {
+        pCond = Aig_And( pAig, Aig_ObjChild0(pObj), pCond );
+        Aig_ObjPatchFanin0( pAig, pObj, pCond );
+    }
+    // set the flops
+    Aig_ManSetRegNum( pAig, Aig_ManRegNum(pAig) + nCycles );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+