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/**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_ManForEachCi( pAig, pObj, i )
{
if ( i < nDualPis )
{
pTemp0 = Aig_ObjCreateCi( pAigNew );
pTemp1 = Aig_ObjCreateCi( pAigNew );
}
else if ( i < Saig_ManPiNum(pAig) )
{
pTemp1 = Aig_ObjCreateCi( pAigNew );
pTemp0 = Aig_Not( pTemp1 );
}
else
{
pTemp0 = Aig_ObjCreateCi( pAigNew );
pTemp1 = Aig_ObjCreateCi( 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_ObjCreateCo( pAigNew, pMiter );
// create flops
Saig_ManForEachLi( pAig, pObj, i )
{
Saig_ObjDualFanin( pAigNew, vCopies, pObj, 0, &pTemp0, &pTemp1 );
pTemp0 = Aig_NotCond( pTemp0, !fDualFfs );
Aig_ObjCreateCo( pAigNew, pTemp0 );
Aig_ObjCreateCo( 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_ObjCreateCo( pAig, pPrev );
pPrev = Aig_ObjCreateCi( 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
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