/**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"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Starts the SAT manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ssw_Frm_t * Ssw_FrmStart( Aig_Man_t * pAig )
{
Ssw_Frm_t * p;
p = ABC_ALLOC( Ssw_Frm_t, 1 );
memset( p, 0, sizeof(Ssw_Frm_t) );
p->pAig = pAig;
p->nObjs = Aig_ManObjNumMax( pAig );
p->nFrames = 0;
p->pFrames = NULL;
p->vAig2Frm = Vec_PtrAlloc( 0 );
Vec_PtrFill( p->vAig2Frm, 2 * p->nObjs, NULL );
return p;
}
/**Function*************************************************************
Synopsis [Starts the SAT manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ssw_FrmStop( Ssw_Frm_t * p )
{
if ( p->pFrames )
Aig_ManStop( p->pFrames );
Vec_PtrFree( p->vAig2Frm );
ABC_FREE( p );
}
/**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, int fTwoPos )
{
Aig_Obj_t * pObjNew, * pObjNew2, * pObjRepr, * pObjReprNew, * pMiter;
// skip nodes without representative
pObjRepr = Aig_ObjRepr(pAig, pObj);
if ( pObjRepr == NULL )
return;
p->nConstrTotal++;
assert( pObjRepr->Id < pObj->Id );
// get the new node
pObjNew = Ssw_ObjFrame( p, pObj, iFrame );
// get the new node of the representative
pObjReprNew = Ssw_ObjFrame( p, pObjRepr, iFrame );
// if this is the same node, no need to add constraints
if ( pObj->fPhase == pObjRepr->fPhase )
{
assert( pObjNew != Aig_Not(pObjReprNew) );
if ( pObjNew == pObjReprNew )
return;
}
else
{
assert( pObjNew != pObjReprNew );
if ( pObjNew == Aig_Not(pObjReprNew) )
return;
}
p->nConstrReduced++;
// these are different nodes - perform speculative reduction
pObjNew2 = Aig_NotCond( pObjReprNew, pObj->fPhase ^ pObjRepr->fPhase );
// set the new node
Ssw_ObjSetFrame( p, pObj, iFrame, pObjNew2 );
// add the constraint
if ( fTwoPos )
{
Aig_ObjCreateCo( pFrames, pObjNew2 );
Aig_ObjCreateCo( pFrames, pObjNew );
}
else
{
pMiter = Aig_Exor( pFrames, pObjNew, pObjNew2 );
Aig_ObjCreateCo( pFrames, Aig_NotCond(pMiter, Aig_ObjPhaseReal(pMiter)) );
}
}
/**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, f, iLits;
assert( p->pFrames == NULL );
assert( Aig_ManRegNum(p->pAig) > 0 );
assert( Aig_ManRegNum(p->pAig) < Aig_ManCiNum(p->pAig) );
p->nConstrTotal = p->nConstrReduced = 0;
// 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_ObjSetFrame( p, pObj, 0, Aig_ObjCreateCi(pFrames) );
// add timeframes
iLits = 0;
for ( f = 0; f < p->pPars->nFramesK; f++ )
{
// map constants and PIs
Ssw_ObjSetFrame( p, Aig_ManConst1(p->pAig), f, Aig_ManConst1(pFrames) );
Saig_ManForEachPi( p->pAig, pObj, i )
{
pObjNew = Aig_ObjCreateCi(pFrames);
pObjNew->fPhase = (p->vInits != NULL) && Vec_IntEntry(p->vInits, iLits++);
Ssw_ObjSetFrame( p, pObj, f, pObjNew );
}
// set the constraints on the latch outputs
Saig_ManForEachLo( p->pAig, pObj, i )
Ssw_FramesConstrainNode( p, pFrames, p->pAig, pObj, f, 1 );
// 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_ObjSetFrame( p, pObj, f, pObjNew );
Ssw_FramesConstrainNode( p, pFrames, p->pAig, pObj, f, 1 );
}
// transfer to the primary outputs
Aig_ManForEachCo( p->pAig, pObj, i )
Ssw_ObjSetFrame( p, pObj, f, Ssw_ObjChild0Fra(p, pObj,f) );
// transfer latch input to the latch outputs
Saig_ManForEachLiLo( p->pAig, pObjLi, pObjLo, i )
Ssw_ObjSetFrame( p, pObjLo, f+1, Ssw_ObjFrame(p, pObjLi,f) );
}
assert( p->vInits == NULL || Vec_IntSize(p->vInits) == iLits + Saig_ManPiNum(p->pAig) );
// add the POs for the latch outputs of the last frame
Saig_ManForEachLo( p->pAig, pObj, i )
Aig_ObjCreateCo( pFrames, Ssw_ObjFrame( p, pObj, p->pPars->nFramesK ) );
// remove dangling nodes
Aig_ManCleanup( pFrames );
// make sure the satisfying assignment is node assigned
assert( pFrames->pData == NULL );
//Aig_ManShow( pFrames, 0, NULL );
return pFrames;
}
/**Function*************************************************************
Synopsis [Prepares the inductive case with speculative reduction.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Ssw_SpeculativeReduction( Ssw_Man_t * p )
{
Aig_Man_t * pFrames;
Aig_Obj_t * pObj, * pObjNew;
int i;
assert( p->pFrames == NULL );
assert( Aig_ManRegNum(p->pAig) > 0 );
assert( Aig_ManRegNum(p->pAig) < Aig_ManCiNum(p->pAig) );
p->nConstrTotal = p->nConstrReduced = 0;
// start the fraig package
pFrames = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * p->nFrames );
pFrames->pName = Abc_UtilStrsav( p->pAig->pName );
// map constants and PIs
Ssw_ObjSetFrame( p, Aig_ManConst1(p->pAig), 0, Aig_ManConst1(pFrames) );
Saig_ManForEachPi( p->pAig, pObj, i )
Ssw_ObjSetFrame( p, pObj, 0, Aig_ObjCreateCi(pFrames) );
// create latches for the first frame
Saig_ManForEachLo( p->pAig, pObj, i )
Ssw_ObjSetFrame( p, pObj, 0, Aig_ObjCreateCi(pFrames) );
// set the constraints on the latch outputs
Saig_ManForEachLo( p->pAig, pObj, i )
Ssw_FramesConstrainNode( p, pFrames, p->pAig, pObj, 0, 0 );
// add internal nodes of this frame
Aig_ManForEachNode( p->pAig, pObj, i )
{
pObjNew = Aig_And( pFrames, Ssw_ObjChild0Fra(p, pObj, 0), Ssw_ObjChild1Fra(p, pObj, 0) );
Ssw_ObjSetFrame( p, pObj, 0, pObjNew );
Ssw_FramesConstrainNode( p, pFrames, p->pAig, pObj, 0, 0 );
}
// add the POs for the latch outputs of the last frame
Saig_ManForEachLi( p->pAig, pObj, i )
Aig_ObjCreateCo( pFrames, Ssw_ObjChild0Fra(p, pObj,0) );
// remove dangling nodes
Aig_ManCleanup( pFrames );
Aig_ManSetRegNum( pFrames, Aig_ManRegNum(p->pAig) );
// Abc_Print( 1, "SpecRed: Total constraints = %d. Reduced constraints = %d.\n",
// p->nConstrTotal, p->nConstrReduced );
return pFrames;
}
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/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END