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Diffstat (limited to 'src/base/abcs/abcRetImpl.c')
| -rw-r--r-- | src/base/abcs/abcRetImpl.c | 450 |
1 files changed, 0 insertions, 450 deletions
diff --git a/src/base/abcs/abcRetImpl.c b/src/base/abcs/abcRetImpl.c deleted file mode 100644 index 07e6d24e..00000000 --- a/src/base/abcs/abcRetImpl.c +++ /dev/null @@ -1,450 +0,0 @@ -/**CFile**************************************************************** - - FileName [abcRetImpl.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Network and node package.] - - Synopsis [Implementation of retiming.] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - June 20, 2005.] - - Revision [$Id: abcRetImpl.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "abcs.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -static void Abc_ObjRetimeForward( Abc_Obj_t * pObj ); -static int Abc_ObjRetimeBackward( Abc_Obj_t * pObj, Abc_Ntk_t * pNtk, stmm_table * tTable, Vec_Int_t * vValues ); -static void Abc_ObjRetimeBackwardUpdateEdge( Abc_Obj_t * pObj, int Edge, stmm_table * tTable ); -static void Abc_NtkRetimeSetInitialValues( Abc_Ntk_t * pNtk, stmm_table * tTable, int * pModel ); - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Implements the retiming on the sequential AIG.] - - Description [Split the retiming into forward and backward.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Abc_NtkImplementRetiming( Abc_Ntk_t * pNtk, Vec_Str_t * vLags, int fVerbose ) -{ - Vec_Int_t * vSteps; - Vec_Ptr_t * vMoves; - int RetValue; - - // forward retiming - vSteps = Abc_NtkUtilRetimingSplit( vLags, 1 ); - // translate each set of steps into moves - if ( fVerbose ) - printf( "The number of forward steps = %6d.\n", Vec_IntSize(vSteps) ); - vMoves = Abc_NtkUtilRetimingGetMoves( pNtk, vSteps, 1 ); - if ( fVerbose ) - printf( "The number of forward moves = %6d.\n", Vec_PtrSize(vMoves) ); - // implement this retiming - Abc_NtkImplementRetimingForward( pNtk, vMoves ); - Vec_IntFree( vSteps ); - Vec_PtrFree( vMoves ); - - // backward retiming - vSteps = Abc_NtkUtilRetimingSplit( vLags, 0 ); - // translate each set of steps into moves - if ( fVerbose ) - printf( "The number of backward steps = %6d.\n", Vec_IntSize(vSteps) ); - vMoves = Abc_NtkUtilRetimingGetMoves( pNtk, vSteps, 0 ); - if ( fVerbose ) - printf( "The number of backward moves = %6d.\n", Vec_PtrSize(vMoves) ); - // implement this retiming - RetValue = Abc_NtkImplementRetimingBackward( pNtk, vMoves, fVerbose ); - Vec_IntFree( vSteps ); - Vec_PtrFree( vMoves ); - return RetValue; -} - -/**Function************************************************************* - - Synopsis [Implements the given retiming on the sequential AIG.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkImplementRetimingForward( Abc_Ntk_t * pNtk, Vec_Ptr_t * vMoves ) -{ - Abc_Obj_t * pNode; - int i; - Vec_PtrForEachEntry( vMoves, pNode, i ) - Abc_ObjRetimeForward( pNode ); -} - -/**Function************************************************************* - - Synopsis [Retimes node forward by one latch.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_ObjRetimeForward( Abc_Obj_t * pObj ) -{ - Abc_Obj_t * pFanout; - int Init0, Init1, Init, i; - assert( Abc_ObjFaninNum(pObj) == 2 ); - assert( Abc_ObjFaninL0(pObj) >= 1 ); - assert( Abc_ObjFaninL1(pObj) >= 1 ); - // remove the init values from the fanins - Init0 = Abc_ObjFaninLDeleteFirst( pObj, 0 ); - Init1 = Abc_ObjFaninLDeleteFirst( pObj, 1 ); - assert( Init0 != ABC_INIT_NONE ); - assert( Init1 != ABC_INIT_NONE ); - // take into account the complements in the node - if ( Abc_ObjFaninC0(pObj) ) - { - if ( Init0 == ABC_INIT_ZERO ) - Init0 = ABC_INIT_ONE; - else if ( Init0 == ABC_INIT_ONE ) - Init0 = ABC_INIT_ZERO; - } - if ( Abc_ObjFaninC1(pObj) ) - { - if ( Init1 == ABC_INIT_ZERO ) - Init1 = ABC_INIT_ONE; - else if ( Init1 == ABC_INIT_ONE ) - Init1 = ABC_INIT_ZERO; - } - // compute the value at the output of the node - if ( Init0 == ABC_INIT_ZERO || Init1 == ABC_INIT_ZERO ) - Init = ABC_INIT_ZERO; - else if ( Init0 == ABC_INIT_ONE && Init1 == ABC_INIT_ONE ) - Init = ABC_INIT_ONE; - else - Init = ABC_INIT_DC; - // add the init values to the fanouts - Abc_ObjForEachFanout( pObj, pFanout, i ) - Abc_ObjFaninLInsertLast( pFanout, Abc_ObjEdgeNum(pObj, pFanout), Init ); -} - - - -/**Function************************************************************* - - Synopsis [Implements the given retiming on the sequential AIG.] - - Description [Returns 0 of initial state computation fails.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Abc_NtkImplementRetimingBackward( Abc_Ntk_t * pNtk, Vec_Ptr_t * vMoves, int fVerbose ) -{ - Abc_RetEdge_t RetEdge; - stmm_table * tTable; - stmm_generator * gen; - Vec_Int_t * vValues; - Abc_Ntk_t * pNtkProb, * pNtkMiter, * pNtkCnf; - Abc_Obj_t * pNode, * pNodeNew; - int * pModel, RetValue, i, clk; - - // return if the retiming is trivial - if ( Vec_PtrSize(vMoves) == 0 ) - return 1; - - // create the network for the initial state computation - // start the table and the array of PO values - pNtkProb = Abc_NtkAlloc( ABC_NTK_LOGIC, ABC_FUNC_SOP ); - tTable = stmm_init_table( stmm_numcmp, stmm_numhash ); - vValues = Vec_IntAlloc( 100 ); - - // perform the backward moves and build the network for initial state computation - RetValue = 0; - Vec_PtrForEachEntry( vMoves, pNode, i ) - RetValue |= Abc_ObjRetimeBackward( pNode, pNtkProb, tTable, vValues ); - - // add the PIs corresponding to the white spots - stmm_foreach_item( tTable, gen, (char **)&RetEdge, (char **)&pNodeNew ) - Abc_ObjAddFanin( pNodeNew, Abc_NtkCreatePi(pNtkProb) ); - - // add the PI/PO names - Abc_NtkAddDummyPiNames( pNtkProb ); - Abc_NtkAddDummyPoNames( pNtkProb ); - - // make sure everything is okay with the network structure - if ( !Abc_NtkDoCheck( pNtkProb ) ) - { - printf( "Abc_NtkImplementRetimingBackward: The internal network check has failed.\n" ); - Abc_NtkRetimeSetInitialValues( pNtk, tTable, NULL ); - Abc_NtkDelete( pNtkProb ); - stmm_free_table( tTable ); - Vec_IntFree( vValues ); - return 0; - } - - // check if conflict is found - if ( RetValue ) - { - printf( "Abc_NtkImplementRetimingBackward: A top level conflict is detected. DC latch values are used.\n" ); - Abc_NtkRetimeSetInitialValues( pNtk, tTable, NULL ); - Abc_NtkDelete( pNtkProb ); - stmm_free_table( tTable ); - Vec_IntFree( vValues ); - return 0; - } - - // get the miter cone - pNtkMiter = Abc_NtkCreateCone( pNtkProb, pNtkProb->vCos, vValues ); - Abc_NtkDelete( pNtkProb ); - Vec_IntFree( vValues ); - - if ( fVerbose ) - printf( "The number of ANDs in the AIG = %5d.\n", Abc_NtkNodeNum(pNtkMiter) ); - - // transform the miter into a logic network for efficient CNF construction - pNtkCnf = Abc_NtkRenode( pNtkMiter, 0, 100, 1, 0, 0 ); - Abc_NtkDelete( pNtkMiter ); - - // solve the miter -clk = clock(); - RetValue = Abc_NtkMiterSat( pNtkCnf, 30, 0 ); -if ( fVerbose ) -if ( clock() - clk > 500 ) -{ -PRT( "SAT solving time", clock() - clk ); -} - pModel = pNtkCnf->pModel; pNtkCnf->pModel = NULL; - Abc_NtkDelete( pNtkCnf ); - - // analyze the result - if ( RetValue == -1 || RetValue == 1 ) - { - Abc_NtkRetimeSetInitialValues( pNtk, tTable, NULL ); - if ( RetValue == 1 ) - printf( "Abc_NtkImplementRetimingBackward: The problem is unsatisfiable. DC latch values are used.\n" ); - else - printf( "Abc_NtkImplementRetimingBackward: The SAT problem timed out. DC latch values are used.\n" ); - stmm_free_table( tTable ); - return 0; - } - - // set the values of the latches - Abc_NtkRetimeSetInitialValues( pNtk, tTable, pModel ); - stmm_free_table( tTable ); - free( pModel ); - return 1; -} - -/**Function************************************************************* - - Synopsis [Retimes node backward by one latch.] - - Description [Constructs the problem for initial state computation. - Returns 1 if the conflict is found.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Abc_ObjRetimeBackward( Abc_Obj_t * pObj, Abc_Ntk_t * pNtkNew, stmm_table * tTable, Vec_Int_t * vValues ) -{ - Abc_Obj_t * pFanout; - Abc_InitType_t Init, Value; - Abc_RetEdge_t RetEdge; - Abc_Obj_t * pNodeNew, * pFanoutNew, * pBuffer; - int i, Edge, fMet0, fMet1, fMetN; - - // make sure the node can be retimed - assert( Abc_ObjFanoutLMin(pObj) > 0 ); - // get the fanout values - fMet0 = fMet1 = fMetN = 0; - Abc_ObjForEachFanout( pObj, pFanout, i ) - { - Init = Abc_ObjFaninLGetInitLast( pFanout, Abc_ObjEdgeNum(pObj, pFanout) ); - if ( Init == ABC_INIT_ZERO ) - fMet0 = 1; - else if ( Init == ABC_INIT_ONE ) - fMet1 = 1; - else if ( Init == ABC_INIT_NONE ) - fMetN = 1; - } - - // consider the case when all fanout latchs have don't-care values - // the new values on the fanin edges will be don't-cares - if ( !fMet0 && !fMet1 && !fMetN ) - { - // update the fanout edges - Abc_ObjForEachFanout( pObj, pFanout, i ) - Abc_ObjFaninLDeleteLast( pFanout, Abc_ObjEdgeNum(pObj, pFanout) ); - // update the fanin edges - Abc_ObjRetimeBackwardUpdateEdge( pObj, 0, tTable ); - Abc_ObjRetimeBackwardUpdateEdge( pObj, 1, tTable ); - Abc_ObjFaninLInsertFirst( pObj, 0, ABC_INIT_DC ); - Abc_ObjFaninLInsertFirst( pObj, 1, ABC_INIT_DC ); - return 0; - } - // the initial values on the fanout edges contain 0, 1, or unknown - // the new values on the fanin edges will be unknown - - // add new AND-gate to the network - pNodeNew = Abc_NtkCreateNode( pNtkNew ); - pNodeNew->pData = Abc_SopCreateAnd2( pNtkNew->pManFunc, Abc_ObjFaninC0(pObj), Abc_ObjFaninC1(pObj) ); - - // add PO fanouts if any - if ( fMet0 ) - { - Abc_ObjAddFanin( Abc_NtkCreatePo(pNtkNew), pNodeNew ); - Vec_IntPush( vValues, 0 ); - } - if ( fMet1 ) - { - Abc_ObjAddFanin( Abc_NtkCreatePo(pNtkNew), pNodeNew ); - Vec_IntPush( vValues, 1 ); - } - - // perform the changes - Abc_ObjForEachFanout( pObj, pFanout, i ) - { - Edge = Abc_ObjEdgeNum( pObj, pFanout ); - Value = Abc_ObjFaninLDeleteLast( pFanout, Edge ); - if ( Value != ABC_INIT_NONE ) - continue; - // value is unknown, remove it from the table - RetEdge.iNode = pFanout->Id; - RetEdge.iEdge = Edge; - RetEdge.iLatch = Abc_ObjFaninL( pFanout, Edge ); // after edge is removed - if ( !stmm_delete( tTable, (char **)&RetEdge, (char **)&pFanoutNew ) ) - assert( 0 ); - // create the fanout of the AND gate - Abc_ObjAddFanin( pFanoutNew, pNodeNew ); - } - - // update the fanin edges - Abc_ObjRetimeBackwardUpdateEdge( pObj, 0, tTable ); - Abc_ObjRetimeBackwardUpdateEdge( pObj, 1, tTable ); - Abc_ObjFaninLInsertFirst( pObj, 0, ABC_INIT_NONE ); - Abc_ObjFaninLInsertFirst( pObj, 1, ABC_INIT_NONE ); - - // add the buffer - pBuffer = Abc_NtkCreateNode( pNtkNew ); - pBuffer->pData = Abc_SopCreateBuf( pNtkNew->pManFunc ); - Abc_ObjAddFanin( pNodeNew, pBuffer ); - // point to it from the table - RetEdge.iNode = pObj->Id; - RetEdge.iEdge = 0; - RetEdge.iLatch = 0; - if ( stmm_insert( tTable, (char *)Abc_RetEdge2Int(RetEdge), (char *)pBuffer ) ) - assert( 0 ); - - // add the buffer - pBuffer = Abc_NtkCreateNode( pNtkNew ); - pBuffer->pData = Abc_SopCreateBuf( pNtkNew->pManFunc ); - Abc_ObjAddFanin( pNodeNew, pBuffer ); - // point to it from the table - RetEdge.iNode = pObj->Id; - RetEdge.iEdge = 1; - RetEdge.iLatch = 0; - if ( stmm_insert( tTable, (char *)Abc_RetEdge2Int(RetEdge), (char *)pBuffer ) ) - assert( 0 ); - - // report conflict is found - return fMet0 && fMet1; -} - -/**Function************************************************************* - - Synopsis [Generates the printable edge label with the initial state.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_ObjRetimeBackwardUpdateEdge( Abc_Obj_t * pObj, int Edge, stmm_table * tTable ) -{ - Abc_Obj_t * pFanoutNew; - Abc_RetEdge_t RetEdge; - Abc_InitType_t Init; - int nLatches, i; - - // get the number of latches on the edge - nLatches = Abc_ObjFaninL( pObj, Edge ); - assert( nLatches <= ABC_MAX_EDGE_LATCH ); - for ( i = nLatches - 1; i >= 0; i-- ) - { - // get the value of this latch - Init = Abc_ObjFaninLGetInitOne( pObj, Edge, i ); - if ( Init != ABC_INIT_NONE ) - continue; - // get the retiming edge - RetEdge.iNode = pObj->Id; - RetEdge.iEdge = Edge; - RetEdge.iLatch = i; - // remove entry from table and add it with a different key - if ( !stmm_delete( tTable, (char **)&RetEdge, (char **)&pFanoutNew ) ) - assert( 0 ); - RetEdge.iLatch++; - if ( stmm_insert( tTable, (char *)Abc_RetEdge2Int(RetEdge), (char *)pFanoutNew ) ) - assert( 0 ); - } -} - -/**Function************************************************************* - - Synopsis [Sets the initial values.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkRetimeSetInitialValues( Abc_Ntk_t * pNtk, stmm_table * tTable, int * pModel ) -{ - Abc_Obj_t * pNode; - stmm_generator * gen; - Abc_RetEdge_t RetEdge; - Abc_InitType_t Init; - int i; - - i = 0; - stmm_foreach_item( tTable, gen, (char **)&RetEdge, NULL ) - { - pNode = Abc_NtkObj( pNtk, RetEdge.iNode ); - Init = pModel? (pModel[i]? ABC_INIT_ONE : ABC_INIT_ZERO) : ABC_INIT_DC; - Abc_ObjFaninLSetInitOne( pNode, RetEdge.iEdge, RetEdge.iLatch, Init ); - i++; - } -} - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |