/**CFile****************************************************************
FileName [bmcMaxi.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT-based bounded model checking.]
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: bmcMaxi.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "bmc.h"
#include "sat/cnf/cnf.h"
#include "sat/bsat/satStore.h"
#include "aig/gia/giaAig.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline Cnf_Dat_t * Cnf_DeriveGiaRemapped( Gia_Man_t * p )
{
Cnf_Dat_t * pCnf;
Aig_Man_t * pAig = Gia_ManToAigSimple( p );
pAig->nRegs = 0;
pCnf = Cnf_Derive( pAig, Aig_ManCoNum(pAig) );
Aig_ManStop( pAig );
return pCnf;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Gia_ManMaxiUnfold( Gia_Man_t * p, int nFrames, int fUseVars, Vec_Int_t * vInit )
{
Gia_Man_t * pNew, * pTemp;
Gia_Obj_t * pObj;
int i, f;
pNew = Gia_ManStart( fUseVars * 2 * Gia_ManRegNum(p) + nFrames * Gia_ManObjNum(p) );
pNew->pName = Abc_UtilStrsav( p->pName );
Gia_ManHashAlloc( pNew );
Gia_ManConst0(p)->Value = 0;
// control/data variables
Gia_ManForEachRo( p, pObj, i )
Gia_ManAppendCi( pNew );
Gia_ManForEachRo( p, pObj, i )
Gia_ManAppendCi( pNew );
// build timeframes
assert( !vInit || Vec_IntSize(vInit) == Gia_ManRegNum(p) );
Gia_ManForEachRo( p, pObj, i )
{
int Value = Vec_IntEntry( vInit, i );
int iCtrl = Gia_ManCiLit( pNew, i );
int iData = Gia_ManCiLit( pNew, Gia_ManRegNum(p)+i );
// decide based on Value
if ( Value == 0 )
pObj->Value = fUseVars ? Gia_ManHashAnd(pNew, iCtrl, iData) : 0;
else if ( Value == 1 )
pObj->Value = fUseVars ? Gia_ManHashOr(pNew, Abc_LitNot(iCtrl), iData) : 1;
else if ( Value == 2 )
pObj->Value = Gia_ManHashAnd(pNew, iCtrl, iData);
else if ( Value == 3 )
pObj->Value = Gia_ManHashOr(pNew, Abc_LitNot(iCtrl), iData);
else if ( Value == 4 )
pObj->Value = 0;
else if ( Value == 5 )
pObj->Value = 1;
else assert( 0 );
}
for ( f = 0; f < nFrames; f++ )
{
Gia_ManForEachPi( p, pObj, i )
pObj->Value = Gia_ManAppendCi( pNew );
Gia_ManForEachAnd( p, pObj, i )
pObj->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
Gia_ManForEachRi( p, pObj, i )
pObj->Value = Gia_ObjFanin0Copy(pObj);
Gia_ManForEachRo( p, pObj, i )
pObj->Value = Gia_ObjRoToRi(p, pObj)->Value;
}
Gia_ManForEachRi( p, pObj, i )
pObj->Value = Gia_ManAppendCo( pNew, pObj->Value );
pNew = Gia_ManCleanup( pTemp = pNew );
Gia_ManStop( pTemp );
assert( Gia_ManPiNum(pNew) == 2 * Gia_ManRegNum(p) + nFrames * Gia_ManPiNum(p) );
return pNew;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Gia_ManMaxiPerform( Gia_Man_t * p, Vec_Int_t * vInit, int nFrames, int nTimeOut, int fVerbose )
{
int nIterMax = 1000000;
int i, iLit, Iter, status;
int nLits, * pLits;
abctime clkTotal = Abc_Clock();
abctime clkSat = 0;
Vec_Int_t * vLits, * vMap;
sat_solver * pSat;
Gia_Obj_t * pObj;
Gia_Man_t * p0 = Gia_ManMaxiUnfold( p, nFrames, 0, vInit );
Gia_Man_t * p1 = Gia_ManMaxiUnfold( p, nFrames, 1, vInit );
Gia_Man_t * pM = Gia_ManMiter( p0, p1, 0, 0, 0, 0, 0 );
Cnf_Dat_t * pCnf = Cnf_DeriveGiaRemapped( pM );
Gia_ManStop( p0 );
Gia_ManStop( p1 );
assert( Gia_ManRegNum(p) > 0 );
if ( fVerbose )
printf( "Running with %d frames and %sgiven init state.\n", nFrames, vInit ? "":"no " );
pSat = sat_solver_new();
sat_solver_setnvars( pSat, pCnf->nVars );
sat_solver_set_runtime_limit( pSat, nTimeOut ? nTimeOut * CLOCKS_PER_SEC + Abc_Clock(): 0 );
for ( i = 0; i < pCnf->nClauses; i++ )
if ( !sat_solver_addclause( pSat, pCnf->pClauses[i], pCnf->pClauses[i+1] ) )
assert( 0 );
// add one large OR clause
vLits = Vec_IntAlloc( Gia_ManCoNum(p) );
Gia_ManForEachCo( pM, pObj, i )
Vec_IntPush( vLits, Abc_Var2Lit(pCnf->pVarNums[Gia_ObjId(pM, pObj)], 0) );
sat_solver_addclause( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits) );
// create assumptions
Vec_IntClear( vLits );
Gia_ManForEachPi( pM, pObj, i )
if ( i == Gia_ManRegNum(p) )
break;
else if ( Vec_IntEntry(vInit, i) == 0 || Vec_IntEntry(vInit, i) == 1 )
Vec_IntPush( vLits, Abc_Var2Lit(pCnf->pVarNums[Gia_ObjId(pM, pObj)], 1) );
if ( fVerbose )
{
printf( "Iter%6d : ", 0 );
printf( "Var =%10d ", sat_solver_nvars(pSat) );
printf( "Clause =%10d ", sat_solver_nclauses(pSat) );
printf( "Conflict =%10d ", sat_solver_nconflicts(pSat) );
printf( "Subset =%6d ", Vec_IntSize(vLits) );
Abc_PrintTime( 1, "Time", clkSat );
// ABC_PRTr( "Solver time", clkSat );
}
for ( Iter = 0; Iter < nIterMax; Iter++ )
{
abctime clk = Abc_Clock();
status = sat_solver_solve( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits), (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
clkSat += Abc_Clock() - clk;
if ( status == l_Undef )
{
// if ( fVerbose )
// printf( "\n" );
printf( "Timeout reached after %d seconds and %d iterations. ", nTimeOut, Iter );
break;
}
if ( status == l_True )
{
// if ( fVerbose )
// printf( "\n" );
printf( "The problem is SAT after %d iterations. ", Iter );
break;
}
assert( status == l_False );
nLits = sat_solver_final( pSat, &pLits );
if ( fVerbose )
{
printf( "Iter%6d : ", Iter+1 );
printf( "Var =%10d ", sat_solver_nvars(pSat) );
printf( "Clause =%10d ", sat_solver_nclauses(pSat) );
printf( "Conflict =%10d ", sat_solver_nconflicts(pSat) );
printf( "Subset =%6d ", nLits );
Abc_PrintTime( 1, "Time", clkSat );
// ABC_PRTr( "Solver time", clkSat );
}
if ( Vec_IntSize(vLits) == nLits )
{
// if ( fVerbose )
// printf( "\n" );
printf( "Reached fixed point with %d entries after %d iterations. ", Vec_IntSize(vLits), Iter+1 );
break;
}
// collect used literals
Vec_IntClear( vLits );
for ( i = 0; i < nLits; i++ )
Vec_IntPush( vLits, Abc_LitNot(pLits[i]) );
}
// create map
vMap = Vec_IntStart( pCnf->nVars );
Vec_IntForEachEntry( vLits, iLit, i )
Vec_IntWriteEntry( vMap, Abc_Lit2Var(iLit), 1 );
// create output
Vec_IntFree( vLits );
vLits = Vec_IntDup(vInit);
Gia_ManForEachPi( pM, pObj, i )
if ( i == Gia_ManRegNum(p) )
break;
else if ( Vec_IntEntry(vLits, i) == 4 || Vec_IntEntry(vLits, i) == 5 )
Vec_IntWriteEntry( vLits, i, Vec_IntEntry(vLits, i) );
else if ( (Vec_IntEntry(vLits, i) == 0 || Vec_IntEntry(vLits, i) == 1) && !Vec_IntEntry(vMap, pCnf->pVarNums[Gia_ObjId(pM, pObj)]) )
Vec_IntWriteEntry( vLits, i, Vec_IntEntry(vLits, i) | 2 );
Vec_IntFree( vMap );
// cleanup
sat_solver_delete( pSat );
Cnf_DataFree( pCnf );
Gia_ManStop( pM );
Abc_PrintTime( 1, "Total runtime", Abc_Clock() - clkTotal );
return vLits;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Gia_ManMaxiTest( Gia_Man_t * p, Vec_Int_t * vInit0, int nFrames, int nWords, int nTimeOut, int fSim, int fVerbose )
{
Vec_Int_t * vRes, * vInit;
vInit = vInit0 ? vInit0 : Vec_IntStart( Gia_ManRegNum(p) );
vRes = Gia_ManMaxiPerform( p, vInit, nFrames, nTimeOut, fVerbose );
if ( vInit != vInit0 )
Vec_IntFree( vInit );
return vRes;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END