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Diffstat (limited to 'src/aig/hop/hopBalance.c')
| -rw-r--r-- | src/aig/hop/hopBalance.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/src/aig/hop/hopBalance.c b/src/aig/hop/hopBalance.c new file mode 100644 index 00000000..73c90685 --- /dev/null +++ b/src/aig/hop/hopBalance.c @@ -0,0 +1,391 @@ +/**CFile**************************************************************** + + FileName [hopBalance.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Minimalistic And-Inverter Graph package.] + + Synopsis [Algebraic AIG balancing.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - May 11, 2006.] + + Revision [$Id: hopBalance.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "hop.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static Hop_Obj_t * Hop_NodeBalance_rec( Hop_Man_t * pNew, Hop_Obj_t * pObj, Vec_Vec_t * vStore, int Level, int fUpdateLevel ); +static Vec_Ptr_t * Hop_NodeBalanceCone( Hop_Obj_t * pObj, Vec_Vec_t * vStore, int Level ); +static int Hop_NodeBalanceFindLeft( Vec_Ptr_t * vSuper ); +static void Hop_NodeBalancePermute( Hop_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor ); +static void Hop_NodeBalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Hop_Obj_t * pObj ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Performs algebraic balancing of the AIG.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Hop_Man_t * Hop_ManBalance( Hop_Man_t * p, int fUpdateLevel ) +{ + Hop_Man_t * pNew; + Hop_Obj_t * pObj, * pObjNew; + Vec_Vec_t * vStore; + int i; + // create the new manager + pNew = Hop_ManStart(); + pNew->fRefCount = 0; + // map the PI nodes + Hop_ManCleanData( p ); + Hop_ManConst1(p)->pData = Hop_ManConst1(pNew); + Hop_ManForEachPi( p, pObj, i ) + pObj->pData = Hop_ObjCreatePi(pNew); + // balance the AIG + vStore = Vec_VecAlloc( 50 ); + Hop_ManForEachPo( p, pObj, i ) + { + pObjNew = Hop_NodeBalance_rec( pNew, Hop_ObjFanin0(pObj), vStore, 0, fUpdateLevel ); + Hop_ObjCreatePo( pNew, Hop_NotCond( pObjNew, Hop_ObjFaninC0(pObj) ) ); + } + Vec_VecFree( vStore ); + // remove dangling nodes +// Hop_ManCreateRefs( pNew ); +// if ( i = Hop_ManCleanup( pNew ) ) +// printf( "Cleanup after balancing removed %d dangling nodes.\n", i ); + // check the resulting AIG + if ( !Hop_ManCheck(pNew) ) + printf( "Hop_ManBalance(): The check has failed.\n" ); + return pNew; +} + +/**Function************************************************************* + + Synopsis [Returns the new node constructed.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Hop_Obj_t * Hop_NodeBalance_rec( Hop_Man_t * pNew, Hop_Obj_t * pObjOld, Vec_Vec_t * vStore, int Level, int fUpdateLevel ) +{ + Hop_Obj_t * pObjNew; + Vec_Ptr_t * vSuper; + int i; + assert( !Hop_IsComplement(pObjOld) ); + // return if the result is known + if ( pObjOld->pData ) + return pObjOld->pData; + assert( Hop_ObjIsNode(pObjOld) ); + // get the implication supergate + vSuper = Hop_NodeBalanceCone( pObjOld, vStore, Level ); + // check if supergate contains two nodes in the opposite polarity + if ( vSuper->nSize == 0 ) + return pObjOld->pData = Hop_ManConst0(pNew); + if ( Vec_PtrSize(vSuper) < 2 ) + printf( "BUG!\n" ); + // for each old node, derive the new well-balanced node + for ( i = 0; i < Vec_PtrSize(vSuper); i++ ) + { + pObjNew = Hop_NodeBalance_rec( pNew, Hop_Regular(vSuper->pArray[i]), vStore, Level + 1, fUpdateLevel ); + vSuper->pArray[i] = Hop_NotCond( pObjNew, Hop_IsComplement(vSuper->pArray[i]) ); + } + // build the supergate + pObjNew = Hop_NodeBalanceBuildSuper( pNew, vSuper, Hop_ObjType(pObjOld), fUpdateLevel ); + // make sure the balanced node is not assigned +// assert( pObjOld->Level >= Hop_Regular(pObjNew)->Level ); + assert( pObjOld->pData == NULL ); + return pObjOld->pData = pObjNew; +} + +/**Function************************************************************* + + Synopsis [Collects the nodes of the supergate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Hop_NodeBalanceCone_rec( Hop_Obj_t * pRoot, Hop_Obj_t * pObj, Vec_Ptr_t * vSuper ) +{ + int RetValue1, RetValue2, i; + // check if the node is visited + if ( Hop_Regular(pObj)->fMarkB ) + { + // check if the node occurs in the same polarity + for ( i = 0; i < vSuper->nSize; i++ ) + if ( vSuper->pArray[i] == pObj ) + return 1; + // check if the node is present in the opposite polarity + for ( i = 0; i < vSuper->nSize; i++ ) + if ( vSuper->pArray[i] == Hop_Not(pObj) ) + return -1; + assert( 0 ); + return 0; + } + // if the new node is complemented or a PI, another gate begins + if ( pObj != pRoot && (Hop_IsComplement(pObj) || Hop_ObjType(pObj) != Hop_ObjType(pRoot) || Hop_ObjRefs(pObj) > 1) ) + { + Vec_PtrPush( vSuper, pObj ); + Hop_Regular(pObj)->fMarkB = 1; + return 0; + } + assert( !Hop_IsComplement(pObj) ); + assert( Hop_ObjIsNode(pObj) ); + // go through the branches + RetValue1 = Hop_NodeBalanceCone_rec( pRoot, Hop_ObjChild0(pObj), vSuper ); + RetValue2 = Hop_NodeBalanceCone_rec( pRoot, Hop_ObjChild1(pObj), vSuper ); + if ( RetValue1 == -1 || RetValue2 == -1 ) + return -1; + // return 1 if at least one branch has a duplicate + return RetValue1 || RetValue2; +} + +/**Function************************************************************* + + Synopsis [Collects the nodes of the supergate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Vec_Ptr_t * Hop_NodeBalanceCone( Hop_Obj_t * pObj, Vec_Vec_t * vStore, int Level ) +{ + Vec_Ptr_t * vNodes; + int RetValue, i; + assert( !Hop_IsComplement(pObj) ); + // extend the storage + if ( Vec_VecSize( vStore ) <= Level ) + Vec_VecPush( vStore, Level, 0 ); + // get the temporary array of nodes + vNodes = Vec_VecEntry( vStore, Level ); + Vec_PtrClear( vNodes ); + // collect the nodes in the implication supergate + RetValue = Hop_NodeBalanceCone_rec( pObj, pObj, vNodes ); + assert( vNodes->nSize > 1 ); + // unmark the visited nodes + Vec_PtrForEachEntry( vNodes, pObj, i ) + Hop_Regular(pObj)->fMarkB = 0; + // if we found the node and its complement in the same implication supergate, + // return empty set of nodes (meaning that we should use constant-0 node) + if ( RetValue == -1 ) + vNodes->nSize = 0; + return vNodes; +} + +/**Function************************************************************* + + Synopsis [Procedure used for sorting the nodes in decreasing order of levels.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Hop_NodeCompareLevelsDecrease( Hop_Obj_t ** pp1, Hop_Obj_t ** pp2 ) +{ + int Diff = Hop_ObjLevel(Hop_Regular(*pp1)) - Hop_ObjLevel(Hop_Regular(*pp2)); + if ( Diff > 0 ) + return -1; + if ( Diff < 0 ) + return 1; + return 0; +} + +/**Function************************************************************* + + Synopsis [Builds implication supergate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Hop_Obj_t * Hop_NodeBalanceBuildSuper( Hop_Man_t * p, Vec_Ptr_t * vSuper, Hop_Type_t Type, int fUpdateLevel ) +{ + Hop_Obj_t * pObj1, * pObj2; + int LeftBound; + assert( vSuper->nSize > 1 ); + // sort the new nodes by level in the decreasing order + Vec_PtrSort( vSuper, Hop_NodeCompareLevelsDecrease ); + // balance the nodes + while ( vSuper->nSize > 1 ) + { + // find the left bound on the node to be paired + LeftBound = (!fUpdateLevel)? 0 : Hop_NodeBalanceFindLeft( vSuper ); + // find the node that can be shared (if no such node, randomize choice) + Hop_NodeBalancePermute( p, vSuper, LeftBound, Type == AIG_EXOR ); + // pull out the last two nodes + pObj1 = Vec_PtrPop(vSuper); + pObj2 = Vec_PtrPop(vSuper); + Hop_NodeBalancePushUniqueOrderByLevel( vSuper, Hop_Oper(p, pObj1, pObj2, Type) ); + } + return Vec_PtrEntry(vSuper, 0); +} + +/**Function************************************************************* + + Synopsis [Finds the left bound on the next candidate to be paired.] + + Description [The nodes in the array are in the decreasing order of levels. + The last node in the array has the smallest level. By default it would be paired + with the next node on the left. However, it may be possible to pair it with some + other node on the left, in such a way that the new node is shared. This procedure + finds the index of the left-most node, which can be paired with the last node.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Hop_NodeBalanceFindLeft( Vec_Ptr_t * vSuper ) +{ + Hop_Obj_t * pObjRight, * pObjLeft; + int Current; + // if two or less nodes, pair with the first + if ( Vec_PtrSize(vSuper) < 3 ) + return 0; + // set the pointer to the one before the last + Current = Vec_PtrSize(vSuper) - 2; + pObjRight = Vec_PtrEntry( vSuper, Current ); + // go through the nodes to the left of this one + for ( Current--; Current >= 0; Current-- ) + { + // get the next node on the left + pObjLeft = Vec_PtrEntry( vSuper, Current ); + // if the level of this node is different, quit the loop + if ( Hop_ObjLevel(Hop_Regular(pObjLeft)) != Hop_ObjLevel(Hop_Regular(pObjRight)) ) + break; + } + Current++; + // get the node, for which the equality holds + pObjLeft = Vec_PtrEntry( vSuper, Current ); + assert( Hop_ObjLevel(Hop_Regular(pObjLeft)) == Hop_ObjLevel(Hop_Regular(pObjRight)) ); + return Current; +} + +/**Function************************************************************* + + Synopsis [Moves closer to the end the node that is best for sharing.] + + Description [If there is no node with sharing, randomly chooses one of + the legal nodes.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Hop_NodeBalancePermute( Hop_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor ) +{ + Hop_Obj_t * pObj1, * pObj2, * pObj3, * pGhost; + int RightBound, i; + // get the right bound + RightBound = Vec_PtrSize(vSuper) - 2; + assert( LeftBound <= RightBound ); + if ( LeftBound == RightBound ) + return; + // get the two last nodes + pObj1 = Vec_PtrEntry( vSuper, RightBound + 1 ); + pObj2 = Vec_PtrEntry( vSuper, RightBound ); + if ( Hop_Regular(pObj1) == p->pConst1 || Hop_Regular(pObj2) == p->pConst1 ) + return; + // find the first node that can be shared + for ( i = RightBound; i >= LeftBound; i-- ) + { + pObj3 = Vec_PtrEntry( vSuper, i ); + if ( Hop_Regular(pObj3) == p->pConst1 ) + { + Vec_PtrWriteEntry( vSuper, i, pObj2 ); + Vec_PtrWriteEntry( vSuper, RightBound, pObj3 ); + return; + } + pGhost = Hop_ObjCreateGhost( p, pObj1, pObj3, fExor? AIG_EXOR : AIG_AND ); + if ( Hop_TableLookup( p, pGhost ) ) + { + if ( pObj3 == pObj2 ) + return; + Vec_PtrWriteEntry( vSuper, i, pObj2 ); + Vec_PtrWriteEntry( vSuper, RightBound, pObj3 ); + return; + } + } +/* + // we did not find the node to share, randomize choice + { + int Choice = rand() % (RightBound - LeftBound + 1); + pObj3 = Vec_PtrEntry( vSuper, LeftBound + Choice ); + if ( pObj3 == pObj2 ) + return; + Vec_PtrWriteEntry( vSuper, LeftBound + Choice, pObj2 ); + Vec_PtrWriteEntry( vSuper, RightBound, pObj3 ); + } +*/ +} + +/**Function************************************************************* + + Synopsis [Inserts a new node in the order by levels.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Hop_NodeBalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Hop_Obj_t * pObj ) +{ + Hop_Obj_t * pObj1, * pObj2; + int i; + if ( Vec_PtrPushUnique(vStore, pObj) ) + return; + // find the p of the node + for ( i = vStore->nSize-1; i > 0; i-- ) + { + pObj1 = vStore->pArray[i ]; + pObj2 = vStore->pArray[i-1]; + if ( Hop_ObjLevel(Hop_Regular(pObj1)) <= Hop_ObjLevel(Hop_Regular(pObj2)) ) + break; + vStore->pArray[i ] = pObj2; + vStore->pArray[i-1] = pObj1; + } +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + |