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/**CFile****************************************************************
FileName [fraigSat.c]
PackageName [FRAIG: Functionally reduced AND-INV graphs.]
Synopsis [Proving functional equivalence using SAT.]
Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
Affiliation [UC Berkeley]
Date [Ver. 2.0. Started - October 1, 2004]
Revision [$Id: fraigSat.c,v 1.10 2005/07/08 01:01:32 alanmi Exp $]
***********************************************************************/
#include "fraigInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Fraig_OrderVariables( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
static void Fraig_SetupAdjacent( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars );
static void Fraig_SetupAdjacentMark( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars );
static void Fraig_PrepareCones( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
static void Fraig_PrepareCones_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
static void Fraig_SupergateAddClauses( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper );
static void Fraig_SupergateAddClausesExor( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
static void Fraig_SupergateAddClausesMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
//static void Fraig_DetectFanoutFreeCone( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
static void Fraig_DetectFanoutFreeConeMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
extern void * Msat_ClauseVecReadEntry( void * p, int i );
// The lesson learned seems to be that variable should be in reverse topological order
// from the output of the miter. The ordering of adjacency lists is very important.
// The best way seems to be fanins followed by fanouts. Slight changes to this order
// leads to big degradation in quality.
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Checks equivalence of two nodes.]
Description [Returns 1 iff the nodes are equivalent.]
SideEffects []
SeeAlso []
***********************************************************************/
int Fraig_NodesAreEqual( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit )
{
if ( pNode1 == pNode2 )
return 1;
if ( pNode1 == Fraig_Not(pNode2) )
return 0;
return Fraig_NodeIsEquivalent( p, Fraig_Regular(pNode1), Fraig_Regular(pNode2), nBTLimit );
}
/**Function*************************************************************
Synopsis [Tries to prove the final miter.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_ManProveMiter( Fraig_Man_t * p )
{
Fraig_Node_t * pNode;
int i, clk;
if ( !p->fTryProve )
return;
clk = clock();
// consider all outputs of the multi-output miter
for ( i = 0; i < p->vOutputs->nSize; i++ )
{
pNode = Fraig_Regular(p->vOutputs->pArray[i]);
// skip already constant nodes
if ( pNode == p->pConst1 )
continue;
// skip nodes that are different according to simulation
if ( !Fraig_CompareSimInfo( pNode, p->pConst1, p->nWordsRand, 1 ) )
continue;
if ( Fraig_NodeIsEquivalent( p, p->pConst1, pNode, -1 ) )
{
if ( Fraig_IsComplement(p->vOutputs->pArray[i]) )
p->vOutputs->pArray[i] = Fraig_Not(p->pConst1);
else
p->vOutputs->pArray[i] = p->pConst1;
}
}
if ( p->fVerboseP )
{
PRT( "Final miter proof time", clock() - clk );
}
}
/**Function*************************************************************
Synopsis [Returns 1 if the miter is unsat; 0 if sat; -1 if undecided.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fraig_ManCheckMiter( Fraig_Man_t * p )
{
Fraig_Node_t * pNode;
FREE( p->pModel );
// get the output node (it can be complemented!)
pNode = p->vOutputs->pArray[0];
// if the miter is constant 0, the problem is UNSAT
if ( pNode == Fraig_Not(p->pConst1) )
return 1;
// consider the special case when the miter is constant 1
if ( pNode == p->pConst1 )
{
// in this case, any counter example will do to distinquish it from constant 0
// here we pick the counter example composed of all zeros
p->pModel = Fraig_ManAllocCounterExample( p );
return 0;
}
// save the counter example
p->pModel = Fraig_ManSaveCounterExample( p, pNode );
// if the model is not found, return undecided
if ( p->pModel == NULL )
return -1;
return 0;
}
/**Function*************************************************************
Synopsis [Checks whether two nodes are functinally equivalent.]
Description [The flag (fComp) tells whether the nodes to be checked
are in the opposite polarity. The second flag (fSkipZeros) tells whether
the checking should be performed if the simulation vectors are zeros.
Returns 1 if the nodes are equivalent; 0 othewise.]
SideEffects []
SeeAlso []
***********************************************************************/
int Fraig_NodeIsEquivalent( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit )
{
int RetValue, RetValue1, i, fComp, clk;
int fVerbose = 0;
// make sure the nodes are not complemented
assert( !Fraig_IsComplement(pNew) );
assert( !Fraig_IsComplement(pOld) );
assert( pNew != pOld );
p->nSatCalls++;
// make sure the solver is allocated and has enough variables
if ( p->pSat == NULL )
{
extern int timeSelect;
extern int timeAssign;
// allocate data for SAT solving
p->pSat = Msat_SolverAlloc( 500, 1, 1, 1, 1, 0 );
p->vVarsInt = Msat_SolverReadConeVars( p->pSat );
p->vAdjacents = Msat_SolverReadAdjacents( p->pSat );
p->vVarsUsed = Msat_SolverReadVarsUsed( p->pSat );
timeSelect = 0;
timeAssign = 0;
}
// make sure the SAT solver has enough variables
for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ )
Msat_SolverAddVar( p->pSat );
/*
{
Fraig_Node_t * ppNodes[2] = { pOld, pNew };
extern void Fraig_MappingShowNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppRoots, int nRoots, char * pFileName );
Fraig_MappingShowNodes( p, ppNodes, 2, "temp_aig" );
}
*/
// get the logic cone
clk = clock();
Fraig_OrderVariables( p, pOld, pNew );
// Fraig_PrepareCones( p, pOld, pNew );
p->timeTrav += clock() - clk;
if ( fVerbose )
printf( "%d(%d) - ", Fraig_CountPis(p,p->vVarsInt), Msat_IntVecReadSize(p->vVarsInt) );
// get the complemented attribute
fComp = Fraig_NodeComparePhase( pOld, pNew );
//Msat_SolverPrintClauses( p->pSat );
////////////////////////////////////////////
// prepare the solver to run incrementally on these variables
//clk = clock();
Msat_SolverPrepare( p->pSat, p->vVarsInt );
//p->time3 += clock() - clk;
// solve under assumptions
// A = 1; B = 0 OR A = 1; B = 1
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) );
// run the solver
clk = clock();
RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit );
p->timeSat += clock() - clk;
if ( RetValue1 == MSAT_FALSE )
{
//p->time1 += clock() - clk;
if ( fVerbose )
{
printf( "unsat %d ", Msat_SolverReadBackTracks(p->pSat) );
PRT( "time", clock() - clk );
}
// add the clause
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
// continue solving the other implication
}
else if ( RetValue1 == MSAT_TRUE )
{
//p->time2 += clock() - clk;
if ( fVerbose )
{
printf( "sat %d ", Msat_SolverReadBackTracks(p->pSat) );
PRT( "time", clock() - clk );
}
// record the counter example
Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew );
p->nSatCounter++;
return 0;
}
else // if ( RetValue1 == MSAT_UNKNOWN )
{
p->time3 += clock() - clk;
p->nSatFails++;
return 0;
}
// if the old node was constant 0, we already know the answer
if ( pOld == p->pConst1 )
return 1;
////////////////////////////////////////////
// prepare the solver to run incrementally
//clk = clock();
Msat_SolverPrepare( p->pSat, p->vVarsInt );
//p->time3 += clock() - clk;
// solve under assumptions
// A = 0; B = 1 OR A = 0; B = 0
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) );
// run the solver
clk = clock();
RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit );
p->timeSat += clock() - clk;
if ( RetValue1 == MSAT_FALSE )
{
//p->time1 += clock() - clk;
if ( fVerbose )
{
printf( "unsat %d ", Msat_SolverReadBackTracks(p->pSat) );
PRT( "time", clock() - clk );
}
// add the clause
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
// continue solving the other implication
}
else if ( RetValue1 == MSAT_TRUE )
{
//p->time2 += clock() - clk;
if ( fVerbose )
{
printf( "sat %d ", Msat_SolverReadBackTracks(p->pSat) );
PRT( "time", clock() - clk );
}
// record the counter example
Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew );
p->nSatCounter++;
return 0;
}
else // if ( RetValue1 == MSAT_UNKNOWN )
{
p->time3 += clock() - clk;
p->nSatFails++;
return 0;
}
// return SAT proof
p->nSatProof++;
return 1;
}
/**Function*************************************************************
Synopsis [Checks whether pOld => pNew.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fraig_NodeIsImplication( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit )
{
int RetValue, RetValue1, i, fComp, clk;
int fVerbose = 0;
// make sure the nodes are not complemented
assert( !Fraig_IsComplement(pNew) );
assert( !Fraig_IsComplement(pOld) );
assert( pNew != pOld );
p->nSatCallsImp++;
// make sure the solver is allocated and has enough variables
if ( p->pSat == NULL )
{
extern int timeSelect;
extern int timeAssign;
// allocate data for SAT solving
p->pSat = Msat_SolverAlloc( 500, 1, 1, 1, 1, 0 );
p->vVarsInt = Msat_SolverReadConeVars( p->pSat );
p->vAdjacents = Msat_SolverReadAdjacents( p->pSat );
p->vVarsUsed = Msat_SolverReadVarsUsed( p->pSat );
timeSelect = 0;
timeAssign = 0;
}
// make sure the SAT solver has enough variables
for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ )
Msat_SolverAddVar( p->pSat );
/*
{
Fraig_Node_t * ppNodes[2] = { pOld, pNew };
extern void Fraig_MappingShowNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppRoots, int nRoots, char * pFileName );
Fraig_MappingShowNodes( p, ppNodes, 2, "temp_aig" );
}
*/
// get the logic cone
clk = clock();
Fraig_OrderVariables( p, pOld, pNew );
// Fraig_PrepareCones( p, pOld, pNew );
p->timeTrav += clock() - clk;
if ( fVerbose )
printf( "%d(%d) - ", Fraig_CountPis(p,p->vVarsInt), Msat_IntVecReadSize(p->vVarsInt) );
// get the complemented attribute
fComp = Fraig_NodeComparePhase( pOld, pNew );
//Msat_SolverPrintClauses( p->pSat );
////////////////////////////////////////////
// prepare the solver to run incrementally on these variables
//clk = clock();
Msat_SolverPrepare( p->pSat, p->vVarsInt );
//p->time3 += clock() - clk;
// solve under assumptions
// A = 1; B = 0 OR A = 1; B = 1
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) );
// run the solver
clk = clock();
RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit );
p->timeSat += clock() - clk;
if ( RetValue1 == MSAT_FALSE )
{
//p->time1 += clock() - clk;
if ( fVerbose )
{
printf( "unsat %d ", Msat_SolverReadBackTracks(p->pSat) );
PRT( "time", clock() - clk );
}
// add the clause
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
// p->nSatProofImp++;
return 1;
}
else if ( RetValue1 == MSAT_TRUE )
{
//p->time2 += clock() - clk;
if ( fVerbose )
{
printf( "sat %d ", Msat_SolverReadBackTracks(p->pSat) );
PRT( "time", clock() - clk );
}
// record the counter example
// Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew );
// p->nSatCounterImp++;
return 0;
}
else // if ( RetValue1 == MSAT_UNKNOWN )
{
p->time3 += clock() - clk;
p->nSatFailsImp++;
return 0;
}
}
/**Function*************************************************************
Synopsis [Prepares the SAT solver to run on the two nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_PrepareCones( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
{
// Msat_IntVec_t * vAdjs;
// int * pVars, nVars, i, k;
int nVarsAlloc;
assert( pOld != pNew );
assert( !Fraig_IsComplement(pOld) );
assert( !Fraig_IsComplement(pNew) );
// clean the variables
nVarsAlloc = Msat_IntVecReadSize(pMan->vVarsUsed);
Msat_IntVecFill( pMan->vVarsUsed, nVarsAlloc, 0 );
Msat_IntVecClear( pMan->vVarsInt );
pMan->nTravIds++;
Fraig_PrepareCones_rec( pMan, pNew );
Fraig_PrepareCones_rec( pMan, pOld );
/*
nVars = Msat_IntVecReadSize( pMan->vVarsInt );
pVars = Msat_IntVecReadArray( pMan->vVarsInt );
for ( i = 0; i < nVars; i++ )
{
// process its connections
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
printf( "%d=%d { ", pVars[i], Msat_IntVecReadSize(vAdjs) );
for ( k = 0; k < Msat_IntVecReadSize(vAdjs); k++ )
printf( "%d ", Msat_IntVecReadEntry(vAdjs,k) );
printf( "}\n" );
}
i = 0;
*/
}
/**Function*************************************************************
Synopsis [Traverses the cone, collects the numbers and adds the clauses.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_PrepareCones_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
{
Fraig_Node_t * pFanin;
Msat_IntVec_t * vAdjs;
int fUseMuxes = 1, i;
int fItIsTime;
// skip if the node is aleady visited
assert( !Fraig_IsComplement(pNode) );
if ( pNode->TravId == pMan->nTravIds )
return;
pNode->TravId = pMan->nTravIds;
// collect the node's number (closer to reverse topological order)
Msat_IntVecPush( pMan->vVarsInt, pNode->Num );
Msat_IntVecWriteEntry( pMan->vVarsUsed, pNode->Num, 1 );
if ( !Fraig_NodeIsAnd( pNode ) )
return;
// if the node does not have fanins, create them
fItIsTime = 0;
if ( pNode->vFanins == NULL )
{
fItIsTime = 1;
// create the fanins of the supergate
assert( pNode->fClauses == 0 );
if ( fUseMuxes && Fraig_NodeIsMuxType(pNode) )
{
pNode->vFanins = Fraig_NodeVecAlloc( 4 );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p1) );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p2) );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p1) );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p2) );
Fraig_SupergateAddClausesMux( pMan, pNode );
}
else
{
pNode->vFanins = Fraig_CollectSupergate( pNode, fUseMuxes );
Fraig_SupergateAddClauses( pMan, pNode, pNode->vFanins );
}
assert( pNode->vFanins->nSize > 1 );
pNode->fClauses = 1;
pMan->nVarsClauses++;
// add fanins
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pNode->Num );
assert( Msat_IntVecReadSize( vAdjs ) == 0 );
for ( i = 0; i < pNode->vFanins->nSize; i++ )
{
pFanin = Fraig_Regular(pNode->vFanins->pArray[i]);
Msat_IntVecPush( vAdjs, pFanin->Num );
}
}
// recursively visit the fanins
for ( i = 0; i < pNode->vFanins->nSize; i++ )
Fraig_PrepareCones_rec( pMan, Fraig_Regular(pNode->vFanins->pArray[i]) );
if ( fItIsTime )
{
// recursively visit the fanins
for ( i = 0; i < pNode->vFanins->nSize; i++ )
{
pFanin = Fraig_Regular(pNode->vFanins->pArray[i]);
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num );
Msat_IntVecPush( vAdjs, pNode->Num );
}
}
}
/**Function*************************************************************
Synopsis [Collect variables using their proximity from the nodes.]
Description [This procedure creates a variable order based on collecting
first the nodes that are the closest to the given two target nodes.]
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_OrderVariables( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
{
Fraig_Node_t * pNode, * pFanin;
int i, k, Number, fUseMuxes = 1;
int nVarsAlloc;
assert( pOld != pNew );
assert( !Fraig_IsComplement(pOld) );
assert( !Fraig_IsComplement(pNew) );
pMan->nTravIds++;
// clean the variables
nVarsAlloc = Msat_IntVecReadSize(pMan->vVarsUsed);
Msat_IntVecFill( pMan->vVarsUsed, nVarsAlloc, 0 );
Msat_IntVecClear( pMan->vVarsInt );
// add the first node
Msat_IntVecPush( pMan->vVarsInt, pOld->Num );
Msat_IntVecWriteEntry( pMan->vVarsUsed, pOld->Num, 1 );
pOld->TravId = pMan->nTravIds;
// add the second node
Msat_IntVecPush( pMan->vVarsInt, pNew->Num );
Msat_IntVecWriteEntry( pMan->vVarsUsed, pNew->Num, 1 );
pNew->TravId = pMan->nTravIds;
// create the variable order
for ( i = 0; i < Msat_IntVecReadSize(pMan->vVarsInt); i++ )
{
// get the new node on the frontier
Number = Msat_IntVecReadEntry(pMan->vVarsInt, i);
pNode = pMan->vNodes->pArray[Number];
if ( !Fraig_NodeIsAnd(pNode) )
continue;
// if the node does not have fanins, create them
if ( pNode->vFanins == NULL )
{
// create the fanins of the supergate
assert( pNode->fClauses == 0 );
// detecting a fanout-free cone (experiment only)
// Fraig_DetectFanoutFreeCone( pMan, pNode );
if ( fUseMuxes && Fraig_NodeIsMuxType(pNode) )
{
pNode->vFanins = Fraig_NodeVecAlloc( 4 );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p1) );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p2) );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p1) );
Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p2) );
Fraig_SupergateAddClausesMux( pMan, pNode );
// Fraig_DetectFanoutFreeConeMux( pMan, pNode );
}
else
{
pNode->vFanins = Fraig_CollectSupergate( pNode, fUseMuxes );
Fraig_SupergateAddClauses( pMan, pNode, pNode->vFanins );
}
assert( pNode->vFanins->nSize > 1 );
pNode->fClauses = 1;
pMan->nVarsClauses++;
pNode->fMark2 = 1; // goes together with Fraig_SetupAdjacentMark()
}
// explore the implication fanins of pNode
for ( k = 0; k < pNode->vFanins->nSize; k++ )
{
pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
if ( pFanin->TravId == pMan->nTravIds ) // already collected
continue;
// collect and mark
Msat_IntVecPush( pMan->vVarsInt, pFanin->Num );
Msat_IntVecWriteEntry( pMan->vVarsUsed, pFanin->Num, 1 );
pFanin->TravId = pMan->nTravIds;
}
}
// set up the adjacent variable information
// Fraig_SetupAdjacent( pMan, pMan->vVarsInt );
Fraig_SetupAdjacentMark( pMan, pMan->vVarsInt );
}
/**Function*************************************************************
Synopsis [Set up the adjacent variable information.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_SetupAdjacent( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars )
{
Fraig_Node_t * pNode, * pFanin;
Msat_IntVec_t * vAdjs;
int * pVars, nVars, i, k;
// clean the adjacents for the variables
nVars = Msat_IntVecReadSize( vConeVars );
pVars = Msat_IntVecReadArray( vConeVars );
for ( i = 0; i < nVars; i++ )
{
// process its connections
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
Msat_IntVecClear( vAdjs );
pNode = pMan->vNodes->pArray[pVars[i]];
if ( !Fraig_NodeIsAnd(pNode) )
continue;
// add fanins
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
for ( k = 0; k < pNode->vFanins->nSize; k++ )
// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
{
pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
Msat_IntVecPush( vAdjs, pFanin->Num );
// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
}
}
// add the fanouts
for ( i = 0; i < nVars; i++ )
{
pNode = pMan->vNodes->pArray[pVars[i]];
if ( !Fraig_NodeIsAnd(pNode) )
continue;
// add the edges
for ( k = 0; k < pNode->vFanins->nSize; k++ )
// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
{
pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num );
Msat_IntVecPush( vAdjs, pNode->Num );
// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
}
}
}
/**Function*************************************************************
Synopsis [Set up the adjacent variable information.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_SetupAdjacentMark( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars )
{
Fraig_Node_t * pNode, * pFanin;
Msat_IntVec_t * vAdjs;
int * pVars, nVars, i, k;
// clean the adjacents for the variables
nVars = Msat_IntVecReadSize( vConeVars );
pVars = Msat_IntVecReadArray( vConeVars );
for ( i = 0; i < nVars; i++ )
{
pNode = pMan->vNodes->pArray[pVars[i]];
if ( pNode->fMark2 == 0 )
continue;
// pNode->fMark2 = 0;
// process its connections
// vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
// Msat_IntVecClear( vAdjs );
if ( !Fraig_NodeIsAnd(pNode) )
continue;
// add fanins
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
for ( k = 0; k < pNode->vFanins->nSize; k++ )
// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
{
pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
Msat_IntVecPush( vAdjs, pFanin->Num );
// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
}
}
// add the fanouts
for ( i = 0; i < nVars; i++ )
{
pNode = pMan->vNodes->pArray[pVars[i]];
if ( pNode->fMark2 == 0 )
continue;
pNode->fMark2 = 0;
if ( !Fraig_NodeIsAnd(pNode) )
continue;
// add the edges
for ( k = 0; k < pNode->vFanins->nSize; k++ )
// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
{
pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num );
Msat_IntVecPush( vAdjs, pNode->Num );
// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
}
}
}
/**Function*************************************************************
Synopsis [Adds clauses to the solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_SupergateAddClauses( Fraig_Man_t * p, Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper )
{
int fComp1, RetValue, nVars, Var, Var1, i;
assert( Fraig_NodeIsAnd( pNode ) );
nVars = Msat_SolverReadVarNum(p->pSat);
Var = pNode->Num;
assert( Var < nVars );
for ( i = 0; i < vSuper->nSize; i++ )
{
// get the predecessor nodes
// get the complemented attributes of the nodes
fComp1 = Fraig_IsComplement(vSuper->pArray[i]);
// determine the variable numbers
Var1 = Fraig_Regular(vSuper->pArray[i])->Num;
// check that the variables are in the SAT manager
assert( Var1 < nVars );
// suppose the AND-gate is A * B = C
// add !A => !C or A + !C
// fprintf( pFile, "%d %d 0%c", Var1, -Var, 10 );
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var1, fComp1) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var, 1) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
}
// add A & B => C or !A + !B + C
// fprintf( pFile, "%d %d %d 0%c", -Var1, -Var2, Var, 10 );
Msat_IntVecClear( p->vProj );
for ( i = 0; i < vSuper->nSize; i++ )
{
// get the predecessor nodes
// get the complemented attributes of the nodes
fComp1 = Fraig_IsComplement(vSuper->pArray[i]);
// determine the variable numbers
Var1 = Fraig_Regular(vSuper->pArray[i])->Num;
// add this variable to the array
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var1, !fComp1) );
}
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var, 0) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
}
/**Function*************************************************************
Synopsis [Adds clauses to the solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_SupergateAddClausesExor( Fraig_Man_t * p, Fraig_Node_t * pNode )
{
Fraig_Node_t * pNode1, * pNode2;
int fComp, RetValue;
assert( !Fraig_IsComplement( pNode ) );
assert( Fraig_NodeIsExorType( pNode ) );
// get nodes
pNode1 = Fraig_Regular(Fraig_Regular(pNode->p1)->p1);
pNode2 = Fraig_Regular(Fraig_Regular(pNode->p1)->p2);
// get the complemented attribute of the EXOR/NEXOR gate
fComp = Fraig_NodeIsExor( pNode ); // 1 if EXOR, 0 if NEXOR
// create four clauses
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, fComp) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, !fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, !fComp) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, !fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, !fComp) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, !fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, !fComp) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, fComp) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
}
/**Function*************************************************************
Synopsis [Adds clauses to the solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_SupergateAddClausesMux( Fraig_Man_t * p, Fraig_Node_t * pNode )
{
Fraig_Node_t * pNodeI, * pNodeT, * pNodeE;
int RetValue, VarF, VarI, VarT, VarE, fCompT, fCompE;
assert( !Fraig_IsComplement( pNode ) );
assert( Fraig_NodeIsMuxType( pNode ) );
// get nodes (I = if, T = then, E = else)
pNodeI = Fraig_NodeRecognizeMux( pNode, &pNodeT, &pNodeE );
// get the variable numbers
VarF = pNode->Num;
VarI = pNodeI->Num;
VarT = Fraig_Regular(pNodeT)->Num;
VarE = Fraig_Regular(pNodeE)->Num;
// get the complementation flags
fCompT = Fraig_IsComplement(pNodeT);
fCompE = Fraig_IsComplement(pNodeE);
// f = ITE(i, t, e)
// i' + t' + f
// i' + t + f'
// i + e' + f
// i + e + f'
// create four clauses
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 1) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT, 1^fCompT) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 0) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 1) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT, 0^fCompT) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 1) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 0) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE, 1^fCompE) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 0) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
Msat_IntVecClear( p->vProj );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 0) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE, 0^fCompE) );
Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 1) );
RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
assert( RetValue );
}
/**Function*************************************************************
Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_DetectFanoutFreeCone_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, Fraig_NodeVec_t * vInside, int fFirst )
{
// make the pointer regular
pNode = Fraig_Regular(pNode);
// if the new node is complemented or a PI, another gate begins
if ( (!fFirst && pNode->nRefs > 1) || Fraig_NodeIsVar(pNode) )
{
Fraig_NodeVecPushUnique( vSuper, pNode );
return;
}
// go through the branches
Fraig_DetectFanoutFreeCone_rec( pNode->p1, vSuper, vInside, 0 );
Fraig_DetectFanoutFreeCone_rec( pNode->p2, vSuper, vInside, 0 );
// add the node
Fraig_NodeVecPushUnique( vInside, pNode );
}
/**Function*************************************************************
Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
/*
void Fraig_DetectFanoutFreeCone( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
{
Fraig_NodeVec_t * vFanins;
Fraig_NodeVec_t * vInside;
int nCubes;
extern int Fraig_CutSopCountCubes( Fraig_Man_t * pMan, Fraig_NodeVec_t * vFanins, Fraig_NodeVec_t * vInside );
vFanins = Fraig_NodeVecAlloc( 8 );
vInside = Fraig_NodeVecAlloc( 8 );
Fraig_DetectFanoutFreeCone_rec( pNode, vFanins, vInside, 1 );
assert( vInside->pArray[vInside->nSize-1] == pNode );
nCubes = Fraig_CutSopCountCubes( pMan, vFanins, vInside );
printf( "%d(%d)", vFanins->nSize, nCubes );
Fraig_NodeVecFree( vFanins );
Fraig_NodeVecFree( vInside );
}
*/
/**Function*************************************************************
Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_DetectFanoutFreeConeMux_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, Fraig_NodeVec_t * vInside, int fFirst )
{
// make the pointer regular
pNode = Fraig_Regular(pNode);
// if the new node is complemented or a PI, another gate begins
if ( (!fFirst && pNode->nRefs > 1) || Fraig_NodeIsVar(pNode) || !Fraig_NodeIsMuxType(pNode) )
{
Fraig_NodeVecPushUnique( vSuper, pNode );
return;
}
// go through the branches
Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p1)->p1, vSuper, vInside, 0 );
Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p1)->p2, vSuper, vInside, 0 );
Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p2)->p1, vSuper, vInside, 0 );
Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p2)->p2, vSuper, vInside, 0 );
// add the node
Fraig_NodeVecPushUnique( vInside, pNode );
}
/**Function*************************************************************
Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fraig_DetectFanoutFreeConeMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
{
Fraig_NodeVec_t * vFanins;
Fraig_NodeVec_t * vInside;
int nCubes;
extern int Fraig_CutSopCountCubes( Fraig_Man_t * pMan, Fraig_NodeVec_t * vFanins, Fraig_NodeVec_t * vInside );
vFanins = Fraig_NodeVecAlloc( 8 );
vInside = Fraig_NodeVecAlloc( 8 );
Fraig_DetectFanoutFreeConeMux_rec( pNode, vFanins, vInside, 1 );
assert( vInside->pArray[vInside->nSize-1] == pNode );
// nCubes = Fraig_CutSopCountCubes( pMan, vFanins, vInside );
nCubes = 0;
printf( "%d(%d)", vFanins->nSize, nCubes );
Fraig_NodeVecFree( vFanins );
Fraig_NodeVecFree( vInside );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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