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Diffstat (limited to 'src/aig/saig/saigAbsStart.c')
| -rw-r--r-- | src/aig/saig/saigAbsStart.c | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/src/aig/saig/saigAbsStart.c b/src/aig/saig/saigAbsStart.c new file mode 100644 index 00000000..6ec2c21d --- /dev/null +++ b/src/aig/saig/saigAbsStart.c @@ -0,0 +1,341 @@ +/**CFile**************************************************************** + + FileName [saigAbsStart.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Sequential AIG package.] + + Synopsis [Counter-example-based abstraction.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: saigAbsStart.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "saig.h" +#include "ssw.h" +#include "fra.h" +#include "bbr.h" +#include "pdr.h" + +ABC_NAMESPACE_IMPL_START + + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Find the first PI corresponding to the flop.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Saig_ManCexFirstFlopPi( Aig_Man_t * p, Aig_Man_t * pAbs ) +{ + Aig_Obj_t * pObj; + int i; + assert( pAbs->vCiNumsOrig != NULL ); + Aig_ManForEachPi( p, pObj, i ) + { + if ( Vec_IntEntry(pAbs->vCiNumsOrig, i) >= Saig_ManPiNum(p) ) + return i; + } + return -1; +} + +/**Function************************************************************* + + Synopsis [Derive a new counter-example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Abc_Cex_t * Saig_ManCexRemap( Aig_Man_t * p, Aig_Man_t * pAbs, Abc_Cex_t * pCexAbs ) +{ + Abc_Cex_t * pCex; + Aig_Obj_t * pObj; + int i, f; + if ( !Saig_ManVerifyCex( pAbs, pCexAbs ) ) + printf( "Saig_ManCexRemap(): The intial counter-example is invalid.\n" ); + else + printf( "Saig_ManCexRemap(): The intial counter-example is correct.\n" ); + // start the counter-example + pCex = Abc_CexAlloc( Aig_ManRegNum(p), Saig_ManPiNum(p), pCexAbs->iFrame+1 ); + pCex->iFrame = pCexAbs->iFrame; + pCex->iPo = pCexAbs->iPo; + // copy the bit data + for ( f = 0; f <= pCexAbs->iFrame; f++ ) + { + Saig_ManForEachPi( pAbs, pObj, i ) + { + if ( i == Saig_ManPiNum(p) ) + break; + if ( Aig_InfoHasBit( pCexAbs->pData, pCexAbs->nRegs + pCexAbs->nPis * f + i ) ) + Aig_InfoSetBit( pCex->pData, pCex->nRegs + pCex->nPis * f + i ); + } + } + // verify the counter example + if ( !Saig_ManVerifyCex( p, pCex ) ) + { + printf( "Saig_ManCexRemap(): Counter-example is invalid.\n" ); + Abc_CexFree( pCex ); + pCex = NULL; + } + else + { + printf( "Counter-example verification is successful.\n" ); + printf( "Output %d was asserted in frame %d (use \"write_counter\" to dump a witness). \n", pCex->iPo, pCex->iFrame ); + } + return pCex; +} + +/**Function************************************************************* + + Synopsis [Refines abstraction using one step.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Aig_Man_t * Saig_ManCexRefine( Aig_Man_t * p, Aig_Man_t * pAbs, Vec_Int_t * vFlops, int nFrames, int nConfMaxOne, int fUseBdds, int fUseDprove, int fVerbose, int * pnUseStart, int * piRetValue, int * pnFrames ) +{ + extern int Saig_BmcPerform( Aig_Man_t * pAig, int nStart, int nFramesMax, int nNodesMax, int nTimeOut, int nConfMaxOne, int nConfMaxAll, int fVerbose, int fVerbOverwrite, int * piFrames ); + Vec_Int_t * vFlopsNew; + int i, Entry, RetValue; + *piRetValue = -1; + if ( fUseDprove && Aig_ManRegNum(pAbs) > 0 ) + { +/* + Fra_Sec_t SecPar, * pSecPar = &SecPar; + Fra_SecSetDefaultParams( pSecPar ); + pSecPar->fVerbose = fVerbose; + RetValue = Fra_FraigSec( pAbs, pSecPar, NULL ); +*/ + Abc_Cex_t * pCex = NULL; + Aig_Man_t * pAbsOrpos = Saig_ManDupOrpos( pAbs ); + Pdr_Par_t Pars, * pPars = &Pars; + Pdr_ManSetDefaultParams( pPars ); + pPars->nTimeOut = 10; + pPars->fVerbose = fVerbose; + if ( pPars->fVerbose ) + printf( "Running property directed reachability...\n" ); + RetValue = Pdr_ManSolve( pAbsOrpos, pPars, &pCex ); + if ( pCex ) + pCex->iPo = Saig_ManFindFailedPoCex( pAbs, pCex ); + Aig_ManStop( pAbsOrpos ); + pAbs->pSeqModel = pCex; + if ( RetValue ) + *piRetValue = 1; + + } + else if ( fUseBdds && (Aig_ManRegNum(pAbs) > 0 && Aig_ManRegNum(pAbs) <= 80) ) + { + Saig_ParBbr_t Pars, * pPars = &Pars; + Bbr_ManSetDefaultParams( pPars ); + pPars->TimeLimit = 0; + pPars->nBddMax = 1000000; + pPars->nIterMax = nFrames; + pPars->fPartition = 1; + pPars->fReorder = 1; + pPars->fReorderImage = 1; + pPars->fVerbose = fVerbose; + pPars->fSilent = 0; + RetValue = Aig_ManVerifyUsingBdds( pAbs, pPars ); + if ( RetValue ) + *piRetValue = 1; + } + else + { + Saig_BmcPerform( pAbs, pnUseStart? *pnUseStart: 0, nFrames, 2000, 0, nConfMaxOne, 0, fVerbose, 0, pnFrames ); + } + if ( pAbs->pSeqModel == NULL ) + return NULL; + if ( pnUseStart ) + *pnUseStart = pAbs->pSeqModel->iFrame; +// vFlopsNew = Saig_ManExtendCounterExampleTest( pAbs, Saig_ManCexFirstFlopPi(p, pAbs), pAbs->pSeqModel, 1, fVerbose ); + vFlopsNew = Saig_ManExtendCounterExampleTest3( pAbs, Saig_ManCexFirstFlopPi(p, pAbs), pAbs->pSeqModel, fVerbose ); + if ( vFlopsNew == NULL ) + return NULL; + if ( Vec_IntSize(vFlopsNew) == 0 ) + { + printf( "Discovered a true counter-example!\n" ); + p->pSeqModel = Saig_ManCexRemap( p, pAbs, pAbs->pSeqModel ); + Vec_IntFree( vFlopsNew ); + *piRetValue = 0; + return NULL; + } + // vFlopsNew contains PI numbers that should be kept in pAbs + if ( fVerbose ) + printf( "Adding %d registers to the abstraction.\n\n", Vec_IntSize(vFlopsNew) ); + // add to the abstraction + Vec_IntForEachEntry( vFlopsNew, Entry, i ) + { + Entry = Vec_IntEntry(pAbs->vCiNumsOrig, Entry); + assert( Entry >= Saig_ManPiNum(p) ); + assert( Entry < Aig_ManPiNum(p) ); + Vec_IntPush( vFlops, Entry-Saig_ManPiNum(p) ); + } + Vec_IntFree( vFlopsNew ); + + Vec_IntSort( vFlops, 0 ); + Vec_IntForEachEntryStart( vFlops, Entry, i, 1 ) + assert( Vec_IntEntry(vFlops, i-1) != Entry ); + + return Saig_ManDeriveAbstraction( p, vFlops ); +} + +/**Function************************************************************* + + Synopsis [Refines abstraction using one step.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Saig_ManCexRefineStep( Aig_Man_t * p, Vec_Int_t * vFlops, Abc_Cex_t * pCex, int fTryFour, int fSensePath, int fVerbose ) +{ + Aig_Man_t * pAbs; + Vec_Int_t * vFlopsNew; + int i, Entry, clk = clock(); + pAbs = Saig_ManDeriveAbstraction( p, vFlops ); + if ( fSensePath ) + vFlopsNew = Saig_ManExtendCounterExampleTest2( pAbs, Saig_ManCexFirstFlopPi(p, pAbs), pCex, fVerbose ); + else +// vFlopsNew = Saig_ManExtendCounterExampleTest( pAbs, Saig_ManCexFirstFlopPi(p, pAbs), pCex, fTryFour, fVerbose ); + vFlopsNew = Saig_ManExtendCounterExampleTest3( pAbs, Saig_ManCexFirstFlopPi(p, pAbs), pCex, fVerbose ); + if ( vFlopsNew == NULL ) + { + Aig_ManStop( pAbs ); + return 0; + } + if ( Vec_IntSize(vFlopsNew) == 0 ) + { + printf( "Refinement did not happen. Discovered a true counter-example.\n" ); + printf( "Remapping counter-example from %d to %d primary inputs.\n", Aig_ManPiNum(pAbs), Aig_ManPiNum(p) ); + p->pSeqModel = Saig_ManCexRemap( p, pAbs, pCex ); + Vec_IntFree( vFlopsNew ); + Aig_ManStop( pAbs ); + return 0; + } + if ( fVerbose ) + { + printf( "Adding %d registers to the abstraction. ", Vec_IntSize(vFlopsNew) ); + Abc_PrintTime( 0, "Time", clock() - clk ); + } + // vFlopsNew contains PI number that should be kept in pAbs + // add to the abstraction + Vec_IntForEachEntry( vFlopsNew, Entry, i ) + { + Entry = Vec_IntEntry(pAbs->vCiNumsOrig, Entry); + assert( Entry >= Saig_ManPiNum(p) ); + assert( Entry < Aig_ManPiNum(p) ); + Vec_IntPush( vFlops, Entry-Saig_ManPiNum(p) ); + } + Vec_IntFree( vFlopsNew ); + Aig_ManStop( pAbs ); + return 1; +} + +/**Function************************************************************* + + Synopsis [Computes the flops to remain after abstraction.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Vec_Int_t * Saig_ManCexAbstractionFlops( Aig_Man_t * p, Gia_ParAbs_t * pPars ) +{ + int nUseStart = 0; + Aig_Man_t * pAbs, * pTemp; + Vec_Int_t * vFlops; + int Iter, clk = clock(), clk2 = clock();//, iFlop; + assert( Aig_ManRegNum(p) > 0 ); + if ( pPars->fVerbose ) + printf( "Performing counter-example-based refinement.\n" ); + Aig_ManSetPioNumbers( p ); + vFlops = Vec_IntStartNatural( 1 ); +/* + iFlop = Saig_ManFindFirstFlop( p ); + assert( iFlop >= 0 ); + vFlops = Vec_IntAlloc( 1 ); + Vec_IntPush( vFlops, iFlop ); +*/ + // create the resulting AIG + pAbs = Saig_ManDeriveAbstraction( p, vFlops ); + if ( !pPars->fVerbose ) + { + printf( "Init : " ); + Aig_ManPrintStats( pAbs ); + } + printf( "Refining abstraction...\n" ); + for ( Iter = 0; ; Iter++ ) + { + pTemp = Saig_ManCexRefine( p, pAbs, vFlops, pPars->nFramesBmc, pPars->nConfMaxBmc, pPars->fUseBdds, pPars->fUseDprove, pPars->fVerbose, pPars->fUseStart?&nUseStart:NULL, &pPars->Status, &pPars->nFramesDone ); + if ( pTemp == NULL ) + { + ABC_FREE( p->pSeqModel ); + p->pSeqModel = pAbs->pSeqModel; + pAbs->pSeqModel = NULL; + Aig_ManStop( pAbs ); + break; + } + Aig_ManStop( pAbs ); + pAbs = pTemp; + printf( "ITER %4d : ", Iter ); + if ( !pPars->fVerbose ) + Aig_ManPrintStats( pAbs ); + // output the intermediate result of abstraction + Ioa_WriteAiger( pAbs, "gabs.aig", 0, 0 ); +// printf( "Intermediate abstracted model was written into file \"%s\".\n", "gabs.aig" ); + // check if the ratio is reached + if ( 100.0*(Aig_ManRegNum(p)-Aig_ManRegNum(pAbs))/Aig_ManRegNum(p) < 1.0*pPars->nRatio ) + { + printf( "Refinements is stopped because flop reduction is less than %d%%\n", pPars->nRatio ); + Aig_ManStop( pAbs ); + pAbs = NULL; + Vec_IntFree( vFlops ); + vFlops = NULL; + break; + } + } + return vFlops; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + +ABC_NAMESPACE_IMPL_END + |