diff options
Diffstat (limited to 'src/opt/ret/retInit.c')
| -rw-r--r-- | src/opt/ret/retInit.c | 311 |
1 files changed, 295 insertions, 16 deletions
diff --git a/src/opt/ret/retInit.c b/src/opt/ret/retInit.c index 169d5a63..3eb80da1 100644 --- a/src/opt/ret/retInit.c +++ b/src/opt/ret/retInit.c @@ -1,12 +1,12 @@ /**CFile**************************************************************** - FileName [ret_.c] + FileName [retInit.c] SystemName [ABC: Logic synthesis and verification system.] PackageName [Retiming package.] - Synopsis [] + Synopsis [Initial state computation for backward retiming.] Author [Alan Mishchenko] @@ -14,7 +14,7 @@ Date [Ver. 1.0. Started - Oct 31, 2006.] - Revision [$Id: ret_.c,v 1.00 2006/10/31 00:00:00 alanmi Exp $] + Revision [$Id: retInit.c,v 1.00 2006/10/31 00:00:00 alanmi Exp $] ***********************************************************************/ @@ -24,6 +24,8 @@ /// DECLARATIONS /// //////////////////////////////////////////////////////////////////////// +static int Abc_NtkRetimeVerifyModel( Abc_Ntk_t * pNtkCone, Vec_Int_t * vValues, int * pModel ); + //////////////////////////////////////////////////////////////////////// /// FUNCTION DEFINITIONS /// //////////////////////////////////////////////////////////////////////// @@ -39,29 +41,306 @@ SeeAlso [] ***********************************************************************/ -void Abc_NtkRetimeInitialValues( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkMiter, int fVerbose ) +Vec_Int_t * Abc_NtkRetimeInitialValues( Abc_Ntk_t * pNtkCone, Vec_Int_t * vValues, int fVerbose ) { - Abc_Obj_t * pLatch; - int * pModel, RetValue, clk, i; + Vec_Int_t * vSolution; + Abc_Ntk_t * pNtkMiter, * pNtkLogic; + int RetValue, clk; + if ( pNtkCone == NULL ) + return Vec_IntDup( vValues ); + // convert the target network to AIG + pNtkLogic = Abc_NtkDup( pNtkCone ); + Abc_NtkLogicToAig( pNtkLogic ); + // get the miter + pNtkMiter = Abc_NtkCreateTarget( pNtkLogic, pNtkLogic->vCos, vValues ); if ( fVerbose ) - printf( "The number of ANDs in the AIG = %5d.\n", Abc_NtkNodeNum(pNtkMiter) ); + printf( "The miter for initial state computation has %d AIG nodes. ", Abc_NtkNodeNum(pNtkMiter) ); // solve the miter -clk = clock(); + clk = clock(); RetValue = Abc_NtkMiterSat( pNtkMiter, (sint64)500000, (sint64)50000000, 0, 0, NULL, NULL ); -if ( fVerbose && clock() - clk > 100 ) -{ -PRT( "SAT solving time", clock() - clk ); -} + if ( fVerbose ) + { PRT( "SAT solving time", clock() - clk ); } // analyze the result if ( RetValue == 1 ) printf( "Abc_NtkRetimeInitialValues(): The problem is unsatisfiable. DC latch values are used.\n" ); else if ( RetValue == -1 ) printf( "Abc_NtkRetimeInitialValues(): The SAT problem timed out. DC latch values are used.\n" ); + else if ( !Abc_NtkRetimeVerifyModel( pNtkCone, vValues, pNtkMiter->pModel ) ) + printf( "Abc_NtkRetimeInitialValues(): The computed counter-example is incorrect.\n" ); // set the values of the latches - pModel = pNtkMiter->pModel; pNtkMiter->pModel = NULL; - Abc_NtkForEachLatch( pNtk, pLatch, i ) - pLatch->pData = (void *)(pModel? (pModel[i]? ABC_INIT_ONE : ABC_INIT_ZERO) : ABC_INIT_DC); - FREE( pModel ); + vSolution = RetValue? NULL : Vec_IntAllocArray( pNtkMiter->pModel, Abc_NtkPiNum(pNtkLogic) ); + pNtkMiter->pModel = NULL; + Abc_NtkDelete( pNtkMiter ); + Abc_NtkDelete( pNtkLogic ); + return vSolution; +} + +/**Function************************************************************* + + Synopsis [Computes the results of simulating one node.] + + Description [Assumes that fanins have pCopy set to the input values.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_ObjSopSimulate( Abc_Obj_t * pObj ) +{ + char * pCube, * pSop = pObj->pData; + int nVars, Value, v, ResOr, ResAnd, ResVar; + assert( pSop && !Abc_SopIsExorType(pSop) ); + // simulate the SOP of the node + ResOr = 0; + nVars = Abc_SopGetVarNum(pSop); + Abc_SopForEachCube( pSop, nVars, pCube ) + { + ResAnd = 1; + Abc_CubeForEachVar( pCube, Value, v ) + { + if ( Value == '0' ) + ResVar = 1 ^ ((int)Abc_ObjFanin(pObj, v)->pCopy); + else if ( Value == '1' ) + ResVar = (int)Abc_ObjFanin(pObj, v)->pCopy; + else + continue; + ResAnd &= ResVar; + } + ResOr |= ResAnd; + } + // complement the result if necessary + if ( !Abc_SopGetPhase(pSop) ) + ResOr ^= 1; + return ResOr; +} + +/**Function************************************************************* + + Synopsis [Verifies the counter-example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkRetimeVerifyModel( Abc_Ntk_t * pNtkCone, Vec_Int_t * vValues, int * pModel ) +{ + Vec_Ptr_t * vNodes; + Abc_Obj_t * pObj; + int i, Counter = 0; + assert( Abc_NtkIsSopLogic(pNtkCone) ); + // set the PIs + Abc_NtkForEachPi( pNtkCone, pObj, i ) + pObj->pCopy = (void *)pModel[i]; + // simulate the internal nodes + vNodes = Abc_NtkDfs( pNtkCone, 0 ); + Vec_PtrForEachEntry( vNodes, pObj, i ) + pObj->pCopy = (void *)Abc_ObjSopSimulate( pObj ); + Vec_PtrFree( vNodes ); + // compare the outputs + Abc_NtkForEachPo( pNtkCone, pObj, i ) + pObj->pCopy = Abc_ObjFanin0(pObj)->pCopy; + Abc_NtkForEachPo( pNtkCone, pObj, i ) + Counter += (Vec_IntEntry(vValues, i) != (int)pObj->pCopy); + if ( Counter > 0 ) + printf( "%d outputs (out of %d) have a value mismatch.\n", Counter, Abc_NtkPoNum(pNtkCone) ); + return 1; +} + +/**Function************************************************************* + + Synopsis [Transfer latch initial values to pCopy.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkRetimeTranferToCopy( Abc_Ntk_t * pNtk ) +{ + Abc_Obj_t * pObj; + int i; + Abc_NtkForEachObj( pNtk, pObj, i ) + if ( Abc_ObjIsLatch(pObj) ) + pObj->pCopy = (void *)Abc_LatchIsInit1(pObj); +} + +/**Function************************************************************* + + Synopsis [Transfer latch initial values from pCopy.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkRetimeTranferFromCopy( Abc_Ntk_t * pNtk ) +{ + Abc_Obj_t * pObj; + int i; + Abc_NtkForEachObj( pNtk, pObj, i ) + if ( Abc_ObjIsLatch(pObj) ) + pObj->pData = (void *)(pObj->pCopy? ABC_INIT_ONE : ABC_INIT_ZERO); +} + +/**Function************************************************************* + + Synopsis [Transfer latch initial values to pCopy.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Vec_Int_t * Abc_NtkRetimeCollectLatchValues( Abc_Ntk_t * pNtk ) +{ + Vec_Int_t * vValues; + Abc_Obj_t * pObj; + int i; + vValues = Vec_IntAlloc( Abc_NtkLatchNum(pNtk) ); + Abc_NtkForEachObj( pNtk, pObj, i ) + if ( Abc_ObjIsLatch(pObj) ) + Vec_IntPush( vValues, Abc_LatchIsInit1(pObj) ); + return vValues; +} + +/**Function************************************************************* + + Synopsis [Transfer latch initial values from pCopy.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkRetimeInsertLatchValues( Abc_Ntk_t * pNtk, Vec_Int_t * vValues ) +{ + Abc_Obj_t * pObj; + int i, Counter = 0; + Abc_NtkForEachObj( pNtk, pObj, i ) + if ( Abc_ObjIsLatch(pObj) ) + pObj->pCopy = (void *)Counter++; + Abc_NtkForEachObj( pNtk, pObj, i ) + if ( Abc_ObjIsLatch(pObj) ) + pObj->pData = (void *)(vValues? (Vec_IntEntry(vValues,(int)pObj->pCopy)? ABC_INIT_ONE : ABC_INIT_ZERO) : ABC_INIT_DC); +} + +/**Function************************************************************* + + Synopsis [Transfer latch initial values to pCopy.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Abc_Ntk_t * Abc_NtkRetimeBackwardInitialStart( Abc_Ntk_t * pNtk ) +{ + Abc_Ntk_t * pNtkNew; + Abc_Obj_t * pObj; + int i; + // create the network used for the initial state computation + pNtkNew = Abc_NtkAlloc( ABC_NTK_LOGIC, ABC_FUNC_SOP, 1 ); + // create POs corresponding to the initial values + Abc_NtkForEachObj( pNtk, pObj, i ) + if ( Abc_ObjIsLatch(pObj) ) + pObj->pCopy = Abc_NtkCreatePo(pNtkNew); + return pNtkNew; +} + +/**Function************************************************************* + + Synopsis [Transfer latch initial values to pCopy.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkRetimeBackwardInitialFinish( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew, Vec_Int_t * vValuesOld, int fVerbose ) +{ + Vec_Int_t * vValuesNew; + Abc_Obj_t * pObj; + int i; + // create PIs corresponding to the initial values + Abc_NtkForEachObj( pNtk, pObj, i ) + if ( Abc_ObjIsLatch(pObj) ) + Abc_ObjAddFanin( pObj->pCopy, Abc_NtkCreatePi(pNtkNew) ); + pObj = Abc_NtkPo(pNtkNew, 0); + // assign dummy node names + Abc_NtkAddDummyPiNames( pNtkNew ); + Abc_NtkAddDummyPoNames( pNtkNew ); + // check the network + if ( !Abc_NtkCheck( pNtkNew ) ) + fprintf( stdout, "Abc_NtkRetimeBackwardInitialFinish(): Network check has failed.\n" ); + // derive new initial values + vValuesNew = Abc_NtkRetimeInitialValues( pNtkNew, vValuesOld, fVerbose ); + // insert new initial values + Abc_NtkRetimeInsertLatchValues( pNtk, vValuesNew ); + if ( vValuesNew ) Vec_IntFree( vValuesNew ); +} + + +/**Function************************************************************* + + Synopsis [Cycles the circuit to create a new initial state.] + + Description [Simulates the circuit with random input for the given + number of timeframes to get a better initial state.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkCycleInitStateSop( Abc_Ntk_t * pNtk, int nFrames, int fVerbose ) +{ + Vec_Ptr_t * vNodes; + Abc_Obj_t * pObj; + int i, f; + assert( Abc_NtkIsSopLogic(pNtk) ); + srand( 0x12341234 ); + // initialize the values + Abc_NtkForEachPi( pNtk, pObj, i ) + pObj->pCopy = (void *)(rand() & 1); + Abc_NtkForEachLatch( pNtk, pObj, i ) + pObj->pCopy = (void *)Abc_LatchIsInit1(pObj); + // simulate for the given number of timeframes + vNodes = Abc_NtkDfs( pNtk, 0 ); + for ( f = 0; f < nFrames; f++ ) + { + // simulate internal nodes + Vec_PtrForEachEntry( vNodes, pObj, i ) + pObj->pCopy = (void *)Abc_ObjSopSimulate( pObj ); + // bring the results to the COs + Abc_NtkForEachCo( pNtk, pObj, i ) + pObj->pCopy = Abc_ObjFanin0(pObj)->pCopy; + // assign PI values + Abc_NtkForEachPi( pNtk, pObj, i ) + pObj->pCopy = (void *)(rand() & 1); + // transfer the latch values + Abc_NtkForEachLatch( pNtk, pObj, i ) + Abc_ObjFanout0(pObj)->pCopy = Abc_ObjFanin0(pObj)->pCopy; + } + Vec_PtrFree( vNodes ); + // set the final values + Abc_NtkForEachLatch( pNtk, pObj, i ) + pObj->pData = (void *)(Abc_ObjFanout0(pObj)->pCopy ? ABC_INIT_ONE : ABC_INIT_ZERO); } //////////////////////////////////////////////////////////////////////// |