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Diffstat (limited to 'src/base/abci/abcOdc.c')
| -rw-r--r-- | src/base/abci/abcOdc.c | 1134 |
1 files changed, 1134 insertions, 0 deletions
diff --git a/src/base/abci/abcOdc.c b/src/base/abci/abcOdc.c new file mode 100644 index 00000000..d6e59328 --- /dev/null +++ b/src/base/abci/abcOdc.c @@ -0,0 +1,1134 @@ +/**CFile**************************************************************** + + FileName [abcOdc.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Network and node package.] + + Synopsis [Scalable computation of observability don't-cares.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: abcOdc.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "abc.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +#define ABC_DC_MAX_NODES (1<<15) + +typedef unsigned short Odc_Lit_t; + +typedef struct Odc_Obj_t_ Odc_Obj_t; // 16 bytes +struct Odc_Obj_t_ +{ + Odc_Lit_t iFan0; // first fanin + Odc_Lit_t iFan1; // second fanin + Odc_Lit_t iNext; // next node in the hash table + unsigned short TravId; // the traversal ID + unsigned uData; // the computed data + unsigned uMask; // the variable mask +}; + +typedef struct Odc_Man_t_ Odc_Man_t; +struct Odc_Man_t_ +{ + // dont'-care parameters + int nVarsMax; // the max number of cut variables + int nLevels; // the number of ODC levels + int fVerbose; // the verbosiness flag + int fVeryVerbose;// the verbosiness flag to print per-node stats + int nPercCutoff; // cutoff percentage + + // windowing + Abc_Obj_t * pNode; // the node for windowing + Vec_Ptr_t * vLeaves; // the number of the cut + Vec_Ptr_t * vRoots; // the roots of the cut + Vec_Ptr_t * vBranches; // additional inputs + + // internal AIG package + // objects + int nPis; // number of PIs (nVarsMax + 32) + int nObjs; // number of objects (Const1, PIs, ANDs) + int nObjsAlloc; // number of objects allocated + Odc_Obj_t * pObjs; // objects + Odc_Lit_t iRoot; // the root object + unsigned short nTravIds; // the number of travIDs + // structural hashing + Odc_Lit_t * pTable; // hash table + int nTableSize; // hash table size + Vec_Int_t * vUsedSpots; // the used spots + + // truth tables + int nBits; // the number of bits + int nWords; // the number of words + Vec_Ptr_t * vTruths; // truth tables for each node + Vec_Ptr_t * vTruthsElem; // elementary truth tables for the PIs + unsigned * puTruth; // the place where the resulting truth table does + + // statistics + int nWins; // the number of windows processed + int nWinsEmpty; // the number of empty windows + int nSimsEmpty; // the number of empty simulation infos + int nQuantsOver; // the number of quantification overflows + int nWinsFinish; // the number of windows that finished + int nTotalDcs; // total percentage of DCs + + // runtime + int timeClean; // windowing + int timeWin; // windowing + int timeMiter; // computing the miter + int timeSim; // simulation + int timeQuant; // quantification + int timeTruth; // truth table + int timeTotal; // useful runtime + int timeAbort; // aborted runtime +}; + + +// quantity of different objects +static inline int Odc_PiNum( Odc_Man_t * p ) { return p->nPis; } +static inline int Odc_NodeNum( Odc_Man_t * p ) { return p->nObjs - p->nPis - 1; } +static inline int Odc_ObjNum( Odc_Man_t * p ) { return p->nObjs; } + +// complemented attributes of objects +static inline int Odc_IsComplement( Odc_Lit_t Lit ) { return Lit & (Odc_Lit_t)1; } +static inline Odc_Lit_t Odc_Regular( Odc_Lit_t Lit ) { return Lit & ~(Odc_Lit_t)1; } +static inline Odc_Lit_t Odc_Not( Odc_Lit_t Lit ) { return Lit ^ (Odc_Lit_t)1; } +static inline Odc_Lit_t Odc_NotCond( Odc_Lit_t Lit, int c ) { return Lit ^ (Odc_Lit_t)(c!=0); } + +// specialized Literals +static inline Odc_Lit_t Odc_Const0() { return 1; } +static inline Odc_Lit_t Odc_Const1() { return 0; } +static inline Odc_Lit_t Odc_Var( Odc_Man_t * p, int i ) { assert( i >= 0 && i < p->nPis ); return (i+1) << 1; } +static inline int Odc_IsConst( Odc_Lit_t Lit ) { return Lit < (Odc_Lit_t)2; } +static inline int Odc_IsTerm( Odc_Man_t * p, Odc_Lit_t Lit ) { return (int)(Lit>>1) <= p->nPis; } + +// accessing internal storage +static inline Odc_Obj_t * Odc_ObjNew( Odc_Man_t * p ) { assert( p->nObjs < p->nObjsAlloc ); return p->pObjs + p->nObjs++; } +static inline Odc_Lit_t Odc_Obj2Lit( Odc_Man_t * p, Odc_Obj_t * pObj ) { assert( pObj ); return (pObj - p->pObjs) << 1; } +static inline Odc_Obj_t * Odc_Lit2Obj( Odc_Man_t * p, Odc_Lit_t Lit ) { assert( !(Lit & 1) && (int)(Lit>>1) < p->nObjs ); return p->pObjs + (Lit>>1); } + +// fanins and their complements +static inline Odc_Lit_t Odc_ObjChild0( Odc_Obj_t * pObj ) { return pObj->iFan0; } +static inline Odc_Lit_t Odc_ObjChild1( Odc_Obj_t * pObj ) { return pObj->iFan1; } +static inline Odc_Lit_t Odc_ObjFanin0( Odc_Obj_t * pObj ) { return Odc_Regular(pObj->iFan0); } +static inline Odc_Lit_t Odc_ObjFanin1( Odc_Obj_t * pObj ) { return Odc_Regular(pObj->iFan1); } +static inline int Odc_ObjFaninC0( Odc_Obj_t * pObj ) { return Odc_IsComplement(pObj->iFan0); } +static inline int Odc_ObjFaninC1( Odc_Obj_t * pObj ) { return Odc_IsComplement(pObj->iFan1); } + +// traversal IDs +static inline void Odc_ManIncrementTravId( Odc_Man_t * p ) { p->nTravIds++; } +static inline void Odc_ObjSetTravIdCurrent( Odc_Man_t * p, Odc_Obj_t * pObj ) { pObj->TravId = p->nTravIds; } +static inline int Odc_ObjIsTravIdCurrent( Odc_Man_t * p, Odc_Obj_t * pObj ) { return (int )((int)pObj->TravId == p->nTravIds); } + +// truth tables +static inline unsigned * Odc_ObjTruth( Odc_Man_t * p, Odc_Lit_t Lit ) { assert( !(Lit & 1) ); return Vec_PtrEntry(p->vTruths, Lit >> 1); } + +// iterators +#define Odc_ForEachPi( p, Lit, i ) \ + for ( i = 0; (i < Odc_PiNum(p)) && (((Lit) = Odc_Var(p, i)), 1); i++ ) +#define Odc_ForEachAnd( p, pObj, i ) \ + for ( i = 1 + Odc_CiNum(p); (i < Odc_ObjNum(p)) && ((pObj) = (p)->pObjs + i); i++ ) + + +// exported functions +extern Odc_Man_t * Abc_NtkDontCareAlloc( int nVarsMax, int nLevels, int fVerbose, int fVeryVerbose ); +extern void Abc_NtkDontCareClear( Odc_Man_t * p ); +extern void Abc_NtkDontCareFree( Odc_Man_t * p ); +extern int Abc_NtkDontCareCompute( Odc_Man_t * p, Abc_Obj_t * pNode, Vec_Ptr_t * vLeaves, unsigned * puTruth ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates the don't-care manager.] + + Description [The parameters are the max number of cut variables, + the number of fanout levels used for the ODC computation, and verbosiness.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Odc_Man_t * Abc_NtkDontCareAlloc( int nVarsMax, int nLevels, int fVerbose, int fVeryVerbose ) +{ + Odc_Man_t * p; + unsigned * pData; + int i, k; + p = ALLOC( Odc_Man_t, 1 ); + memset( p, 0, sizeof(Odc_Man_t) ); + assert( nVarsMax > 4 && nVarsMax < 16 ); + assert( nLevels > 0 && nLevels < 10 ); + + srand( 0xABC ); + + // dont'-care parameters + p->nVarsMax = nVarsMax; + p->nLevels = nLevels; + p->fVerbose = fVerbose; + p->fVeryVerbose = fVeryVerbose; + p->nPercCutoff = 10; + + // windowing + p->vRoots = Vec_PtrAlloc( 128 ); + p->vBranches = Vec_PtrAlloc( 128 ); + + // internal AIG package + // allocate room for objects + p->nObjsAlloc = ABC_DC_MAX_NODES; + p->pObjs = ALLOC( Odc_Obj_t, p->nObjsAlloc * sizeof(Odc_Obj_t) ); + p->nPis = nVarsMax + 32; + p->nObjs = 1 + p->nPis; + memset( p->pObjs, 0, p->nObjs * sizeof(Odc_Obj_t) ); + // set the PI masks + for ( i = 0; i < 32; i++ ) + p->pObjs[1 + p->nVarsMax + i].uMask = (1 << i); + // allocate hash table + p->nTableSize = p->nObjsAlloc/3 + 1; + p->pTable = ALLOC( Odc_Lit_t, p->nTableSize * sizeof(Odc_Lit_t) ); + memset( p->pTable, 0, p->nTableSize * sizeof(Odc_Lit_t) ); + p->vUsedSpots = Vec_IntAlloc( 1000 ); + + // truth tables + p->nWords = Abc_TruthWordNum( p->nVarsMax ); + p->nBits = p->nWords * 8 * sizeof(unsigned); + p->vTruths = Vec_PtrAllocSimInfo( p->nObjsAlloc, p->nWords ); + p->vTruthsElem = Vec_PtrAllocSimInfo( p->nVarsMax, p->nWords ); + + // set elementary truth tables + Abc_InfoFill( Vec_PtrEntry(p->vTruths, 0), p->nWords ); + for ( k = 0; k < p->nVarsMax; k++ ) + { +// pData = Odc_ObjTruth( p, Odc_Var(p, k) ); + pData = Vec_PtrEntry( p->vTruthsElem, k ); + Abc_InfoClear( pData, p->nWords ); + for ( i = 0; i < p->nBits; i++ ) + if ( i & (1 << k) ) + pData[i>>5] |= (1 << (i&31)); + } + + // set random truth table for the additional inputs + for ( k = p->nVarsMax; k < p->nPis; k++ ) + { + pData = Odc_ObjTruth( p, Odc_Var(p, k) ); + Abc_InfoRandom( pData, p->nWords ); + } + + // set the miter to the unused value + p->iRoot = 0xffff; + return p; +} + +/**Function************************************************************* + + Synopsis [Clears the manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareClear( Odc_Man_t * p ) +{ + int clk = clock(); + // clean the structural hashing table + if ( Vec_IntSize(p->vUsedSpots) > p->nTableSize/3 ) // more than one third + memset( p->pTable, 0, sizeof(Odc_Lit_t) * p->nTableSize ); + else + { + int iSpot, i; + Vec_IntForEachEntry( p->vUsedSpots, iSpot, i ) + p->pTable[iSpot] = 0; + } + Vec_IntClear( p->vUsedSpots ); + // reset the number of nodes + p->nObjs = 1 + p->nPis; + // reset the root node + p->iRoot = 0xffff; + +p->timeClean += clock() - clk; +} + +/**Function************************************************************* + + Synopsis [Frees the don't-care manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareFree( Odc_Man_t * p ) +{ + if ( p->fVerbose ) + { + printf( "Wins = %5d. Empty = %5d. SimsEmpty = %5d. QuantOver = %5d. WinsFinish = %5d.\n", + p->nWins, p->nWinsEmpty, p->nSimsEmpty, p->nQuantsOver, p->nWinsFinish ); + printf( "Ave DCs per window = %6.2f %%. Ave DCs per finished window = %6.2f %%.\n", + 1.0*p->nTotalDcs/p->nWins, 1.0*p->nTotalDcs/p->nWinsFinish ); + printf( "Runtime stats of the ODC manager:\n" ); + PRT( "Cleaning ", p->timeClean ); + PRT( "Windowing ", p->timeWin ); + PRT( "Miter ", p->timeMiter ); + PRT( "Simulation ", p->timeSim ); + PRT( "Quantifying ", p->timeQuant ); + PRT( "Truth table ", p->timeTruth ); + PRT( "TOTAL ", p->timeTotal ); + PRT( "Aborted ", p->timeAbort ); + } + Vec_PtrFree( p->vRoots ); + Vec_PtrFree( p->vBranches ); + Vec_PtrFree( p->vTruths ); + Vec_PtrFree( p->vTruthsElem ); + Vec_IntFree( p->vUsedSpots ); + free( p->pObjs ); + free( p->pTable ); + free( p ); +} + + + +/**Function************************************************************* + + Synopsis [Marks the TFO of the collected nodes up to the given level.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareWinSweepLeafTfo_rec( Abc_Obj_t * pObj, int nLevelLimit, Abc_Obj_t * pNode ) +{ + Abc_Obj_t * pFanout; + int i; + if ( Abc_ObjIsCo(pObj) || (int)pObj->Level > nLevelLimit || pObj == pNode ) + return; + if ( Abc_NodeIsTravIdCurrent(pObj) ) + return; + Abc_NodeSetTravIdCurrent( pObj ); + //////////////////////////////////////// + // try to reduce the runtime + if ( Abc_ObjFanoutNum(pObj) > 100 ) + return; + //////////////////////////////////////// + Abc_ObjForEachFanout( pObj, pFanout, i ) + Abc_NtkDontCareWinSweepLeafTfo_rec( pFanout, nLevelLimit, pNode ); +} + +/**Function************************************************************* + + Synopsis [Marks the TFO of the collected nodes up to the given level.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareWinSweepLeafTfo( Odc_Man_t * p ) +{ + Abc_Obj_t * pObj; + int i; + Abc_NtkIncrementTravId( p->pNode->pNtk ); + Vec_PtrForEachEntry( p->vLeaves, pObj, i ) + Abc_NtkDontCareWinSweepLeafTfo_rec( pObj, p->pNode->Level + p->nLevels, p->pNode ); +} + +/**Function************************************************************* + + Synopsis [Recursively collects the roots.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareWinCollectRoots_rec( Abc_Obj_t * pObj, Vec_Ptr_t * vRoots ) +{ + Abc_Obj_t * pFanout; + int i; + assert( Abc_ObjIsNode(pObj) ); + assert( Abc_NodeIsTravIdCurrent(pObj) ); + // check if the node has all fanouts marked + Abc_ObjForEachFanout( pObj, pFanout, i ) + if ( !Abc_NodeIsTravIdCurrent(pFanout) ) + break; + // if some of the fanouts are unmarked, add the node to the root + if ( i < Abc_ObjFanoutNum(pObj) ) + { + Vec_PtrPushUnique( vRoots, pObj ); + return; + } + // otherwise, call recursively + Abc_ObjForEachFanout( pObj, pFanout, i ) + Abc_NtkDontCareWinCollectRoots_rec( pFanout, vRoots ); +} + +/**Function************************************************************* + + Synopsis [Collects the roots of the window.] + + Description [Roots of the window are the nodes that have at least + one fanout that it not in the TFO of the leaves.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareWinCollectRoots( Odc_Man_t * p ) +{ + assert( !Abc_NodeIsTravIdCurrent(p->pNode) ); + // mark the node with the old traversal ID + Abc_NodeSetTravIdCurrent( p->pNode ); + // collect the roots + Vec_PtrClear( p->vRoots ); + Abc_NtkDontCareWinCollectRoots_rec( p->pNode, p->vRoots ); +} + +/**Function************************************************************* + + Synopsis [Recursively adds missing nodes and leaves.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareWinAddMissing_rec( Odc_Man_t * p, Abc_Obj_t * pObj ) +{ + Abc_Obj_t * pFanin; + int i; + // skip the already collected leaves and branches + if ( Abc_NodeIsTravIdCurrent(pObj) ) + return 1; + // if this is not an internal node - make it a new branch + if ( !Abc_NodeIsTravIdPrevious(pObj) || Abc_ObjIsCi(pObj) ) //|| (int)pObj->Level <= p->nLevLeaves ) + { + Abc_NodeSetTravIdCurrent( pObj ); + Vec_PtrPush( p->vBranches, pObj ); + return Vec_PtrSize(p->vBranches) <= 32; + } + // visit the fanins of the node + Abc_ObjForEachFanin( pObj, pFanin, i ) + if ( !Abc_NtkDontCareWinAddMissing_rec( p, pFanin ) ) + return 0; + return 1; +} + +/**Function************************************************************* + + Synopsis [Adds to the window nodes and leaves in the TFI of the roots.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareWinAddMissing( Odc_Man_t * p ) +{ + Abc_Obj_t * pObj; + int i; + // set the leaves + Abc_NtkIncrementTravId( p->pNode->pNtk ); + Vec_PtrForEachEntry( p->vLeaves, pObj, i ) + Abc_NodeSetTravIdCurrent( pObj ); + // explore from the roots + Vec_PtrClear( p->vBranches ); + Vec_PtrForEachEntry( p->vRoots, pObj, i ) + if ( !Abc_NtkDontCareWinAddMissing_rec( p, pObj ) ) + return 0; + return 1; +} + +/**Function************************************************************* + + Synopsis [Computes window for the node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareWindow( Odc_Man_t * p ) +{ + // mark the TFO of the collected nodes up to the given level (p->pNode->Level + p->nWinTfoMax) + Abc_NtkDontCareWinSweepLeafTfo( p ); + // find the roots of the window + Abc_NtkDontCareWinCollectRoots( p ); + if ( Vec_PtrSize(p->vRoots) == 1 && Vec_PtrEntry(p->vRoots, 0) == p->pNode ) + { +// printf( "Empty window\n" ); + return 0; + } + // add the nodes in the TFI of the roots that are not yet in the window + if ( !Abc_NtkDontCareWinAddMissing( p ) ) + { +// printf( "Too many branches (%d)\n", Vec_PtrSize(p->vBranches) ); + return 0; + } + return 1; +} + + + + + +/**Function************************************************************* + + Synopsis [Performing hashing of two AIG Literals.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline unsigned Odc_HashKey( Odc_Lit_t iFan0, Odc_Lit_t iFan1, int TableSize ) +{ + unsigned Key = 0; + Key ^= Odc_Regular(iFan0) * 7937; + Key ^= Odc_Regular(iFan1) * 2971; + Key ^= Odc_IsComplement(iFan0) * 911; + Key ^= Odc_IsComplement(iFan1) * 353; + return Key % TableSize; +} + +/**Function************************************************************* + + Synopsis [Checks if the given name node already exists in the table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline Odc_Lit_t * Odc_HashLookup( Odc_Man_t * p, Odc_Lit_t iFan0, Odc_Lit_t iFan1 ) +{ + Odc_Obj_t * pObj; + Odc_Lit_t * pEntry; + unsigned uHashKey; + assert( iFan0 < iFan1 ); + // get the hash key for this node + uHashKey = Odc_HashKey( iFan0, iFan1, p->nTableSize ); + // remember the spot in the hash table that will be used + if ( p->pTable[uHashKey] == 0 ) + Vec_IntPush( p->vUsedSpots, uHashKey ); + // find the entry + for ( pEntry = p->pTable + uHashKey; *pEntry; pEntry = &pObj->iNext ) + { + pObj = Odc_Lit2Obj( p, *pEntry ); + if ( pObj->iFan0 == iFan0 && pObj->iFan1 == iFan1 ) + return pEntry; + } + return pEntry; +} + +/**Function************************************************************* + + Synopsis [Finds node by structural hashing or creates a new node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline Odc_Lit_t Odc_And( Odc_Man_t * p, Odc_Lit_t iFan0, Odc_Lit_t iFan1 ) +{ + Odc_Obj_t * pObj; + Odc_Lit_t * pEntry; + unsigned uMask0, uMask1; + int Temp; + // consider trivial cases + if ( iFan0 == iFan1 ) + return iFan0; + if ( iFan0 == Odc_Not(iFan1) ) + return Odc_Const0(); + if ( Odc_Regular(iFan0) == Odc_Const1() ) + return iFan0 == Odc_Const1() ? iFan1 : Odc_Const0(); + if ( Odc_Regular(iFan1) == Odc_Const1() ) + return iFan1 == Odc_Const1() ? iFan0 : Odc_Const0(); + // canonicize the fanin order + if ( iFan0 > iFan1 ) + Temp = iFan0, iFan0 = iFan1, iFan1 = Temp; + // check if a node with these fanins exists + pEntry = Odc_HashLookup( p, iFan0, iFan1 ); + if ( *pEntry ) + return *pEntry; + // create a new node + pObj = Odc_ObjNew( p ); + pObj->iFan0 = iFan0; + pObj->iFan1 = iFan1; + pObj->iNext = 0; + pObj->TravId = 0; + // set the mask + uMask0 = Odc_Lit2Obj(p, Odc_Regular(iFan0))->uMask; + uMask1 = Odc_Lit2Obj(p, Odc_Regular(iFan1))->uMask; + pObj->uMask = uMask0 | uMask1; + // add to the table + *pEntry = Odc_Obj2Lit( p, pObj ); + return *pEntry; +} + +/**Function************************************************************* + + Synopsis [Boolean OR.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline Odc_Lit_t Odc_Or( Odc_Man_t * p, Odc_Lit_t iFan0, Odc_Lit_t iFan1 ) +{ + return Odc_Not( Odc_And(p, Odc_Not(iFan0), Odc_Not(iFan1)) ); +} + +/**Function************************************************************* + + Synopsis [Boolean XOR.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline Odc_Lit_t Odc_Xor( Odc_Man_t * p, Odc_Lit_t iFan0, Odc_Lit_t iFan1 ) +{ + return Odc_Or( p, Odc_And(p, iFan0, Odc_Not(iFan1)), Odc_And(p, Odc_Not(iFan0), iFan1) ); +} + + + + + +/**Function************************************************************* + + Synopsis [Transfers the window into the AIG package.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void * Abc_NtkDontCareTransfer_rec( Odc_Man_t * p, Abc_Obj_t * pNode, Abc_Obj_t * pPivot ) +{ + unsigned uData0, uData1; + Odc_Lit_t uLit0, uLit1, uRes0, uRes1; + assert( !Abc_ObjIsComplement(pNode) ); + // skip visited objects + if ( Abc_NodeIsTravIdCurrent(pNode) ) + return pNode->pCopy; + Abc_NodeSetTravIdCurrent(pNode); + assert( Abc_ObjIsNode(pNode) ); + // consider the case when the node is the pivot + if ( pNode == pPivot ) + return pNode->pCopy = (void *)((Odc_Const1() << 16) | Odc_Const0()); + // compute the cofactors + uData0 = (unsigned)Abc_NtkDontCareTransfer_rec( p, Abc_ObjFanin0(pNode), pPivot ); + uData1 = (unsigned)Abc_NtkDontCareTransfer_rec( p, Abc_ObjFanin1(pNode), pPivot ); + // find the 0-cofactor + uLit0 = Odc_NotCond( (Odc_Lit_t)(uData0 & 0xffff), Abc_ObjFaninC0(pNode) ); + uLit1 = Odc_NotCond( (Odc_Lit_t)(uData1 & 0xffff), Abc_ObjFaninC1(pNode) ); + uRes0 = Odc_And( p, uLit0, uLit1 ); + // find the 1-cofactor + uLit0 = Odc_NotCond( (Odc_Lit_t)(uData0 >> 16), Abc_ObjFaninC0(pNode) ); + uLit1 = Odc_NotCond( (Odc_Lit_t)(uData1 >> 16), Abc_ObjFaninC1(pNode) ); + uRes1 = Odc_And( p, uLit0, uLit1 ); + // find the result + return pNode->pCopy = (void *)((uRes1 << 16) | uRes0); +} + +/**Function************************************************************* + + Synopsis [Transfers the window into the AIG package.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareTransfer( Odc_Man_t * p ) +{ + Abc_Obj_t * pObj; + Odc_Lit_t uRes0, uRes1; + Odc_Lit_t uLit; + unsigned uData; + int i; + Abc_NtkIncrementTravId( p->pNode->pNtk ); + // set elementary variables at the leaves + Vec_PtrForEachEntry( p->vLeaves, pObj, i ) + { + uLit = Odc_Var( p, i ); + pObj->pCopy = (void *)((uLit << 16) | uLit); + Abc_NodeSetTravIdCurrent(pObj); + } + // set elementary variables at the branched + Vec_PtrForEachEntry( p->vBranches, pObj, i ) + { + uLit = Odc_Var( p, i+p->nVarsMax ); + pObj->pCopy = (void *)((uLit << 16) | uLit); + Abc_NodeSetTravIdCurrent(pObj); + } + // compute the AIG for the window + p->iRoot = Odc_Const0(); + Vec_PtrForEachEntry( p->vRoots, pObj, i ) + { + uData = (unsigned)Abc_NtkDontCareTransfer_rec( p, pObj, p->pNode ); + // get the cofactors + uRes0 = uData & 0xffff; + uRes1 = uData >> 16; + // compute the miter +// assert( uRes0 != uRes1 ); // may be false if the node is redundant w.r.t. this root + uLit = Odc_Xor( p, uRes0, uRes1 ); + p->iRoot = Odc_Or( p, p->iRoot, uLit ); + } + return 1; +} + + +/**Function************************************************************* + + Synopsis [Recursively computes the pair of cofactors.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +unsigned Abc_NtkDontCareCofactors_rec( Odc_Man_t * p, Odc_Lit_t Lit, unsigned uMask ) +{ + Odc_Obj_t * pObj; + unsigned uData0, uData1; + Odc_Lit_t uLit0, uLit1, uRes0, uRes1; + assert( !Odc_IsComplement(Lit) ); + // skip visited objects + pObj = Odc_Lit2Obj( p, Lit ); + if ( Odc_ObjIsTravIdCurrent(p, pObj) ) + return pObj->uData; + Odc_ObjSetTravIdCurrent(p, pObj); + // skip objects out of the cone + if ( (pObj->uMask & uMask) == 0 ) + return pObj->uData = ((Lit << 16) | Lit); + // consider the case when the node is the var + if ( pObj->uMask == uMask && Odc_IsTerm(p, Lit) ) + return pObj->uData = ((Odc_Const1() << 16) | Odc_Const0()); + // compute the cofactors + uData0 = Abc_NtkDontCareCofactors_rec( p, Odc_ObjFanin0(pObj), uMask ); + uData1 = Abc_NtkDontCareCofactors_rec( p, Odc_ObjFanin1(pObj), uMask ); + // find the 0-cofactor + uLit0 = Odc_NotCond( (Odc_Lit_t)(uData0 & 0xffff), Odc_ObjFaninC0(pObj) ); + uLit1 = Odc_NotCond( (Odc_Lit_t)(uData1 & 0xffff), Odc_ObjFaninC1(pObj) ); + uRes0 = Odc_And( p, uLit0, uLit1 ); + // find the 1-cofactor + uLit0 = Odc_NotCond( (Odc_Lit_t)(uData0 >> 16), Odc_ObjFaninC0(pObj) ); + uLit1 = Odc_NotCond( (Odc_Lit_t)(uData1 >> 16), Odc_ObjFaninC1(pObj) ); + uRes1 = Odc_And( p, uLit0, uLit1 ); + // find the result + return pObj->uData = ((uRes1 << 16) | uRes0); +} + +/**Function************************************************************* + + Synopsis [Quantifies the branch variables.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareQuantify( Odc_Man_t * p ) +{ + Odc_Lit_t uRes0, uRes1; + unsigned uData; + int i; + assert( p->iRoot < 0xffff ); + assert( Vec_PtrSize(p->vBranches) <= 32 ); // the mask size + for ( i = 0; i < Vec_PtrSize(p->vBranches); i++ ) + { + // compute the cofactors w.r.t. this variable + Odc_ManIncrementTravId( p ); + uData = Abc_NtkDontCareCofactors_rec( p, Odc_Regular(p->iRoot), (1 << i) ); + uRes0 = Odc_NotCond( (Odc_Lit_t)(uData & 0xffff), Odc_IsComplement(p->iRoot) ); + uRes1 = Odc_NotCond( (Odc_Lit_t)(uData >> 16), Odc_IsComplement(p->iRoot) ); + // quantify this variable existentially + p->iRoot = Odc_Or( p, uRes0, uRes1 ); + // check the limit + if ( Odc_ObjNum(p) > ABC_DC_MAX_NODES/2 ) + return 0; + } + assert( p->nObjs <= p->nObjsAlloc ); + return 1; +} + + + +/**Function************************************************************* + + Synopsis [Set elementary truth tables for PIs.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareSimulateSetElem2( Odc_Man_t * p ) +{ + unsigned * pData; + int i, k; + for ( k = 0; k < p->nVarsMax; k++ ) + { + pData = Odc_ObjTruth( p, Odc_Var(p, k) ); + Abc_InfoClear( pData, p->nWords ); + for ( i = 0; i < p->nBits; i++ ) + if ( i & (1 << k) ) + pData[i>>5] |= (1 << (i&31)); + } +} + +/**Function************************************************************* + + Synopsis [Set elementary truth tables for PIs.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareSimulateSetElem( Odc_Man_t * p ) +{ + unsigned * pData, * pData2; + int k; + for ( k = 0; k < p->nVarsMax; k++ ) + { + pData = Odc_ObjTruth( p, Odc_Var(p, k) ); + pData2 = Vec_PtrEntry( p->vTruthsElem, k ); + Abc_InfoCopy( pData, pData2, p->nWords ); + } +} + +/**Function************************************************************* + + Synopsis [Set random simulation words for PIs.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareSimulateSetRand( Odc_Man_t * p ) +{ + unsigned * pData; + int w, k, Number; + for ( w = 0; w < p->nWords; w++ ) + { + Number = rand(); + for ( k = 0; k < p->nVarsMax; k++ ) + { + pData = Odc_ObjTruth( p, Odc_Var(p, k) ); + pData[w] = (Number & (1<<k)) ? ~0 : 0; + } + } +} + +/**Function************************************************************* + + Synopsis [Set random simulation words for PIs.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareCountMintsWord( Odc_Man_t * p, unsigned * puTruth ) +{ + int w, Counter = 0; + for ( w = 0; w < p->nWords; w++ ) + if ( puTruth[w] ) + Counter++; + return Counter; +} + +/**Function************************************************************* + + Synopsis [Simulates one node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareTruthOne( Odc_Man_t * p, Odc_Lit_t Lit ) +{ + Odc_Obj_t * pObj; + unsigned * pInfo, * pInfo1, * pInfo2; + int k, fComp1, fComp2; + assert( !Odc_IsComplement( Lit ) ); + assert( !Odc_IsTerm( p, Lit ) ); + // get the truth tables + pObj = Odc_Lit2Obj( p, Lit ); + pInfo = Odc_ObjTruth( p, Lit ); + pInfo1 = Odc_ObjTruth( p, Odc_ObjFanin0(pObj) ); + pInfo2 = Odc_ObjTruth( p, Odc_ObjFanin1(pObj) ); + fComp1 = Odc_ObjFaninC0( pObj ); + fComp2 = Odc_ObjFaninC1( pObj ); + // simulate + if ( fComp1 && fComp2 ) + for ( k = 0; k < p->nWords; k++ ) + pInfo[k] = ~pInfo1[k] & ~pInfo2[k]; + else if ( fComp1 && !fComp2 ) + for ( k = 0; k < p->nWords; k++ ) + pInfo[k] = ~pInfo1[k] & pInfo2[k]; + else if ( !fComp1 && fComp2 ) + for ( k = 0; k < p->nWords; k++ ) + pInfo[k] = pInfo1[k] & ~pInfo2[k]; + else // if ( fComp1 && fComp2 ) + for ( k = 0; k < p->nWords; k++ ) + pInfo[k] = pInfo1[k] & pInfo2[k]; +} + +/**Function************************************************************* + + Synopsis [Computes the truth table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Abc_NtkDontCareSimulate_rec( Odc_Man_t * p, Odc_Lit_t Lit ) +{ + Odc_Obj_t * pObj; + assert( !Odc_IsComplement(Lit) ); + // skip terminals + if ( Odc_IsTerm(p, Lit) ) + return; + // skip visited objects + pObj = Odc_Lit2Obj( p, Lit ); + if ( Odc_ObjIsTravIdCurrent(p, pObj) ) + return; + Odc_ObjSetTravIdCurrent(p, pObj); + // call recursively + Abc_NtkDontCareSimulate_rec( p, Odc_ObjFanin0(pObj) ); + Abc_NtkDontCareSimulate_rec( p, Odc_ObjFanin1(pObj) ); + // construct the truth table + Abc_NtkDontCareTruthOne( p, Lit ); +} + +/**Function************************************************************* + + Synopsis [Computes the truth table of the care set.] + + Description [Returns the number of ones in the simulation info.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareSimulate( Odc_Man_t * p, unsigned * puTruth ) +{ + Odc_ManIncrementTravId( p ); + Abc_NtkDontCareSimulate_rec( p, Odc_Regular(p->iRoot) ); + Abc_InfoCopy( puTruth, Odc_ObjTruth(p, Odc_Regular(p->iRoot)), p->nWords ); + if ( Odc_IsComplement(p->iRoot) ) + Abc_InfoNot( puTruth, p->nWords ); + return Extra_TruthCountOnes( puTruth, p->nVarsMax ); +} + +/**Function************************************************************* + + Synopsis [Computes the truth table of the care set.] + + Description [Returns the number of ones in the simulation info.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareSimulateBefore( Odc_Man_t * p, unsigned * puTruth ) +{ + int nIters = 2; + int nRounds, Counter, r; + // decide how many rounds to simulate + nRounds = p->nBits / p->nWords; + Counter = 0; + for ( r = 0; r < nIters; r++ ) + { + Abc_NtkDontCareSimulateSetRand( p ); + Abc_NtkDontCareSimulate( p, puTruth ); + Counter += Abc_NtkDontCareCountMintsWord( p, puTruth ); + } + // normalize + Counter = Counter * nRounds / nIters; + return Counter; +} + +/**Function************************************************************* + + Synopsis [Computes ODCs for the node in terms of the cut variables.] + + Description [Returns the number of don't care minterms in the truth table. + In particular, this procedure returns 0 if there is no don't-cares.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Abc_NtkDontCareCompute( Odc_Man_t * p, Abc_Obj_t * pNode, Vec_Ptr_t * vLeaves, unsigned * puTruth ) +{ + int nMints, RetValue; + int clk, clkTotal = clock(); + + p->nWins++; + + // set the parameters + assert( !Abc_ObjIsComplement(pNode) ); + assert( Abc_ObjIsNode(pNode) ); + assert( Vec_PtrSize(vLeaves) <= p->nVarsMax ); + p->vLeaves = vLeaves; + p->pNode = pNode; + + // compute the window +clk = clock(); + RetValue = Abc_NtkDontCareWindow( p ); +p->timeWin += clock() - clk; + if ( !RetValue ) + { +p->timeAbort += clock() - clkTotal; + Abc_InfoFill( puTruth, p->nWords ); + p->nWinsEmpty++; + return 0; + } + + if ( p->fVeryVerbose ) + { + printf( " %5d : ", pNode->Id ); + printf( "Leaf = %2d ", Vec_PtrSize(p->vLeaves) ); + printf( "Root = %2d ", Vec_PtrSize(p->vRoots) ); + printf( "Bran = %2d ", Vec_PtrSize(p->vBranches) ); + printf( " | " ); + } + + // transfer the window into the AIG package +clk = clock(); + Abc_NtkDontCareTransfer( p ); +p->timeMiter += clock() - clk; + + // simulate to estimate the amount of don't-cares +clk = clock(); + nMints = Abc_NtkDontCareSimulateBefore( p, puTruth ); +p->timeSim += clock() - clk; + if ( p->fVeryVerbose ) + { + printf( "AIG = %5d ", Odc_NodeNum(p) ); + printf( "%6.2f %% ", 100.0 * (p->nBits - nMints) / p->nBits ); + } + + // if there is less then the given percentage of don't-cares, skip + if ( 100.0 * (p->nBits - nMints) / p->nBits < 1.0 * p->nPercCutoff ) + { +p->timeAbort += clock() - clkTotal; + if ( p->fVeryVerbose ) + printf( "Simulation cutoff.\n" ); + Abc_InfoFill( puTruth, p->nWords ); + p->nSimsEmpty++; + return 0; + } + + // quantify external variables +clk = clock(); + RetValue = Abc_NtkDontCareQuantify( p ); +p->timeQuant += clock() - clk; + if ( !RetValue ) + { +p->timeAbort += clock() - clkTotal; + if ( p->fVeryVerbose ) + printf( "=== Overflow! ===\n" ); + Abc_InfoFill( puTruth, p->nWords ); + p->nQuantsOver++; + return 0; + } + + // get the truth table +clk = clock(); + Abc_NtkDontCareSimulateSetElem( p ); + nMints = Abc_NtkDontCareSimulate( p, puTruth ); +p->timeTruth += clock() - clk; + if ( p->fVeryVerbose ) + { + printf( "AIG = %5d ", Odc_NodeNum(p) ); + printf( "%6.2f %% ", 100.0 * (p->nBits - nMints) / p->nBits ); + printf( "\n" ); + } +p->timeTotal += clock() - clkTotal; + p->nWinsFinish++; + p->nTotalDcs += (int)(100.0 * (p->nBits - nMints) / p->nBits); + return nMints; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + |