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/**CFile****************************************************************
FileName [giaFalse.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Scalable AIG package.]
Synopsis [Detection and elimination of false paths.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: giaFalse.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "gia.h"
#include "misc/vec/vecQue.h"
#include "sat/bsat/satStore.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Compute slacks measured using the number of AIG levels.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Gia_ManComputeSlacks( Gia_Man_t * p )
{
Gia_Obj_t * pObj;
int i, nLevels = Gia_ManLevelNum( p );
Vec_Int_t * vLevelR = Gia_ManReverseLevel( p );
Vec_Int_t * vSlacks = Vec_IntAlloc( Gia_ManObjNum(p) );
Gia_ManForEachObj( p, pObj, i )
Vec_IntPush( vSlacks, nLevels - Gia_ObjLevelId(p, i) - Vec_IntEntry(vLevelR, i) );
assert( Vec_IntSize(vSlacks) == Gia_ManObjNum(p) );
Vec_IntFree( vLevelR );
return vSlacks;
}
/**Function*************************************************************
Synopsis [Derive critical path by following minimum slacks.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManCollectPath_rec( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vSlacks, Vec_Int_t * vPath )
{
if ( Gia_ObjIsAnd(pObj) )
{
int Slack = Vec_IntEntry(vSlacks, Gia_ObjId(p, pObj));
int Slack0 = Vec_IntEntry(vSlacks, Gia_ObjFaninId0p(p, pObj));
int Slack1 = Vec_IntEntry(vSlacks, Gia_ObjFaninId1p(p, pObj));
assert( Slack == Slack0 || Slack == Slack1 );
if ( Slack == Slack0 )
Gia_ManCollectPath_rec( p, Gia_ObjFanin0(pObj), vSlacks, vPath );
else
Gia_ManCollectPath_rec( p, Gia_ObjFanin1(pObj), vSlacks, vPath );
}
Vec_IntPush( vPath, Gia_ObjId(p, pObj) );
}
Vec_Int_t * Gia_ManCollectPath( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vSlacks )
{
Vec_Int_t * vPath = Vec_IntAlloc( p->nLevels );
assert( Gia_ObjIsCo(pObj) );
Gia_ManCollectPath_rec( p, Gia_ObjFanin0(pObj), vSlacks, vPath );
return vPath;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManCheckFalseOne( Gia_Man_t * p, int iOut, int nTimeOut, Vec_Int_t * vSlacks )
{
sat_solver * pSat;
Gia_Obj_t * pObj = Gia_ManCo( p, iOut );
Vec_Int_t * vLits = Vec_IntAlloc( p->nLevels );
Vec_Int_t * vPath = Gia_ManCollectPath( p, pObj, vSlacks );
int i, Shift[2], status, nLits, * pLits;
abctime clkStart = Abc_Clock();
// collect objects and assign SAT variables
int iFanin = Gia_ObjFaninId0p( p, pObj );
Vec_Int_t * vObjs = Gia_ManCollectNodesCis( p, &iFanin, 1 );
Gia_ManForEachObjVec( vObjs, p, pObj, i )
pObj->Value = Vec_IntSize(vObjs) - 1 - i;
// create SAT solver
pSat = sat_solver_new();
sat_solver_set_runtime_limit( pSat, nTimeOut ? nTimeOut * CLOCKS_PER_SEC + Abc_Clock(): 0 );
sat_solver_setnvars( pSat, Vec_IntSize(vPath) + 2 * Vec_IntSize(vObjs) );
Shift[0] = Vec_IntSize(vPath);
Shift[1] = Vec_IntSize(vPath) + Vec_IntSize(vObjs);
// add CNF for the path
Gia_ManForEachObjVec( vPath, p, pObj, i )
{
sat_solver_add_xor( pSat, i, pObj->Value + Shift[0], pObj->Value + Shift[1], 0 );
Vec_IntPush( vLits, Abc_Var2Lit(i, 0) );
}
// add CNF for the cone
Gia_ManForEachObjVec( vObjs, p, pObj, i )
{
if ( !Gia_ObjIsAnd(pObj) )
continue;
sat_solver_add_and( pSat, pObj->Value + Shift[0],
Gia_ObjFanin0(pObj)->Value + Shift[0], Gia_ObjFanin1(pObj)->Value + Shift[0],
Gia_ObjFaninC0(pObj), Gia_ObjFaninC1(pObj) );
sat_solver_add_and( pSat, pObj->Value + Shift[1],
Gia_ObjFanin0(pObj)->Value + Shift[1], Gia_ObjFanin1(pObj)->Value + Shift[1],
Gia_ObjFaninC0(pObj), Gia_ObjFaninC1(pObj) );
}
printf( "PO %6d : ", iOut );
// call the SAT solver
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 );
if ( status == l_Undef )
printf( "Timeout reached after %d seconds. ", nTimeOut );
else if ( status == l_True )
printf( "There is no false path. " );
else
{
assert( status == l_False );
// call analize_final
nLits = sat_solver_final( pSat, &pLits );
printf( "False path contains %d nodes (out of %d): ", nLits, Vec_IntSize(vLits) );
printf( "top = %d ", Vec_IntEntry(vPath, Abc_Lit2Var(pLits[0])) );
for ( i = 0; i < nLits; i++ )
printf( "%d ", Abc_Lit2Var(pLits[i]) );
printf( " " );
}
Abc_PrintTime( 1, "Time", Abc_Clock() - clkStart );
sat_solver_delete( pSat );
Vec_IntFree( vObjs );
Vec_IntFree( vPath );
Vec_IntFree( vLits );
}
void Gia_ManCheckFalse( Gia_Man_t * p, int nSlackMax, int nTimeOut )
{
Vec_Que_t * vPrio;
Vec_Flt_t * vWeights;
Vec_Int_t * vSlacks;
Gia_Obj_t * pObj;
int i;
vSlacks = Gia_ManComputeSlacks(p);
//Vec_IntPrint( vSlacks );
// create PO weights
vWeights = Vec_FltAlloc( Gia_ManCoNum(p) );
Gia_ManForEachCo( p, pObj, i )
Vec_FltPush( vWeights, p->nLevels - Vec_IntEntry(vSlacks, Gia_ObjId(p, pObj)) );
// put POs into the queue
vPrio = Vec_QueAlloc( Gia_ManCoNum(p) );
Vec_QueSetPriority( vPrio, Vec_FltArrayP(vWeights) );
Gia_ManForEachCo( p, pObj, i )
Vec_QuePush( vPrio, i );
// work on each PO in the queue
while ( Vec_QueTopPriority(vPrio) >= p->nLevels - nSlackMax )
Gia_ManCheckFalseOne( p, Vec_QuePop(vPrio), nTimeOut, vSlacks );
// cleanup
Vec_IntFree( vSlacks );
Vec_FltFree( vWeights );
Vec_QueFree( vPrio );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManCheckFalseTest( Gia_Man_t * p, int nSlackMax )
{
Gia_ManCheckFalse( p, nSlackMax, 0 );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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