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/**CFile****************************************************************
FileName [simSymSat.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Satisfiability to determine two variable symmetries.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: simSymSat.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "base/abc/abc.h"
#include "proof/fraig/fraig.h"
#include "sim.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static int Sim_SymmsSatProveOne( Sym_Man_t * p, int Out, int Var1, int Var2, unsigned * pPattern );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Tries to prove the remaining pairs using SAT.]
Description [Continues to prove as long as it encounters symmetric pairs.
Returns 1 if a non-symmetric pair is found (which gives a counter-example).
Returns 0 if it finishes considering all pairs for all outputs.]
SideEffects []
SeeAlso []
***********************************************************************/
int Sim_SymmsGetPatternUsingSat( Sym_Man_t * p, unsigned * pPattern )
{
Vec_Int_t * vSupport;
Extra_BitMat_t * pMatSym, * pMatNonSym;
int Index1, Index2, Index3, IndexU, IndexV;
int v, u, i, k, b, out;
// iterate through outputs
for ( out = p->iOutput; out < p->nOutputs; out++ )
{
pMatSym = (Extra_BitMat_t *)Vec_PtrEntry( p->vMatrSymms, out );
pMatNonSym = (Extra_BitMat_t *)Vec_PtrEntry( p->vMatrNonSymms, out );
// go through the remaining variable pairs
vSupport = Vec_VecEntryInt( p->vSupports, out );
Vec_IntForEachEntry( vSupport, v, Index1 )
Vec_IntForEachEntryStart( vSupport, u, Index2, Index1+1 )
{
if ( Extra_BitMatrixLookup1( pMatSym, v, u ) || Extra_BitMatrixLookup1( pMatNonSym, v, u ) )
continue;
p->nSatRuns++;
// collect the support variables that are symmetric with u and v
Vec_IntClear( p->vVarsU );
Vec_IntClear( p->vVarsV );
Vec_IntForEachEntry( vSupport, b, Index3 )
{
if ( Extra_BitMatrixLookup1( pMatSym, u, b ) )
Vec_IntPush( p->vVarsU, b );
if ( Extra_BitMatrixLookup1( pMatSym, v, b ) )
Vec_IntPush( p->vVarsV, b );
}
if ( Sim_SymmsSatProveOne( p, out, v, u, pPattern ) )
{ // update the symmetric variable info
p->nSatRunsUnsat++;
Vec_IntForEachEntry( p->vVarsU, i, IndexU )
Vec_IntForEachEntry( p->vVarsV, k, IndexV )
{
Extra_BitMatrixInsert1( pMatSym, i, k ); // Theorem 1
Extra_BitMatrixInsert2( pMatSym, i, k ); // Theorem 1
Extra_BitMatrixOrTwo( pMatNonSym, i, k ); // Theorem 2
}
}
else
{ // update the assymmetric variable info
p->nSatRunsSat++;
Vec_IntForEachEntry( p->vVarsU, i, IndexU )
Vec_IntForEachEntry( p->vVarsV, k, IndexV )
{
Extra_BitMatrixInsert1( pMatNonSym, i, k ); // Theorem 3
Extra_BitMatrixInsert2( pMatNonSym, i, k ); // Theorem 3
}
// remember the out
p->iOutput = out;
p->iVar1Old = p->iVar1;
p->iVar2Old = p->iVar2;
p->iVar1 = v;
p->iVar2 = u;
return 1;
}
}
// make sure that the symmetry matrix contains only cliques
assert( Extra_BitMatrixIsClique( pMatSym ) );
}
// mark that we finished all outputs
p->iOutput = p->nOutputs;
return 0;
}
/**Function*************************************************************
Synopsis [Returns 1 if the variables are symmetric; 0 otherwise.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Sim_SymmsSatProveOne( Sym_Man_t * p, int Out, int Var1, int Var2, unsigned * pPattern )
{
Fraig_Params_t Params;
Fraig_Man_t * pMan;
Abc_Ntk_t * pMiter;
int RetValue, i;
clock_t clk;
int * pModel;
// get the miter for this problem
pMiter = Abc_NtkMiterForCofactors( p->pNtk, Out, Var1, Var2 );
// transform the miter into a fraig
Fraig_ParamsSetDefault( &Params );
Params.fInternal = 1;
Params.nPatsRand = 512;
Params.nPatsDyna = 512;
Params.nSeconds = ABC_INFINITY;
clk = clock();
pMan = (Fraig_Man_t *)Abc_NtkToFraig( pMiter, &Params, 0, 0 );
p->timeFraig += clock() - clk;
clk = clock();
Fraig_ManProveMiter( pMan );
p->timeSat += clock() - clk;
// analyze the result
RetValue = Fraig_ManCheckMiter( pMan );
// assert( RetValue >= 0 );
// save the pattern
if ( RetValue == 0 )
{
// get the pattern
pModel = Fraig_ManReadModel( pMan );
assert( pModel != NULL );
//printf( "Disproved by SAT: out = %d pair = (%d, %d)\n", Out, Var1, Var2 );
// transfer the model into the pattern
for ( i = 0; i < p->nSimWords; i++ )
pPattern[i] = 0;
for ( i = 0; i < p->nInputs; i++ )
if ( pModel[i] )
Sim_SetBit( pPattern, i );
// make sure these variables have the same value (1)
Sim_SetBit( pPattern, Var1 );
Sim_SetBit( pPattern, Var2 );
}
else if ( RetValue == -1 )
{
// this should never happen; if it happens, such is life
// we are conservative and assume that there is no symmetry
//printf( "STRANGE THING: out = %d %s pair = (%d %s, %d %s)\n",
// Out, Abc_ObjName(Abc_NtkCo(p->pNtk,Out)),
// Var1, Abc_ObjName(Abc_NtkCi(p->pNtk,Var1)),
// Var2, Abc_ObjName(Abc_NtkCi(p->pNtk,Var2)) );
memset( pPattern, 0, sizeof(unsigned) * p->nSimWords );
RetValue = 0;
}
// delete the fraig manager
Fraig_ManFree( pMan );
// delete the miter
Abc_NtkDelete( pMiter );
return RetValue;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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