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author | Alan Mishchenko <alanmi@berkeley.edu> | 2007-09-30 08:01:00 -0700 |
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committer | Alan Mishchenko <alanmi@berkeley.edu> | 2007-09-30 08:01:00 -0700 |
commit | e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7 (patch) | |
tree | de3ffe87c3e17950351e3b7d97fa18318bd5ea9a /src/base/abci/abcBalance.c | |
parent | 7d7e60f2dc84393cd4c5db22d2eaf7b1fb1a79b2 (diff) | |
download | abc-e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7.tar.gz abc-e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7.tar.bz2 abc-e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7.zip |
Version abc70930
Diffstat (limited to 'src/base/abci/abcBalance.c')
-rw-r--r-- | src/base/abci/abcBalance.c | 613 |
1 files changed, 0 insertions, 613 deletions
diff --git a/src/base/abci/abcBalance.c b/src/base/abci/abcBalance.c deleted file mode 100644 index f9b3384e..00000000 --- a/src/base/abci/abcBalance.c +++ /dev/null @@ -1,613 +0,0 @@ -/**CFile**************************************************************** - - FileName [abcBalance.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Network and node package.] - - Synopsis [Performs global balancing of the AIG by the number of levels.] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - June 20, 2005.] - - Revision [$Id: abcBalance.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "abc.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -static void Abc_NtkBalancePerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkAig, bool fDuplicate, bool fSelective, bool fUpdateLevel ); -static Abc_Obj_t * Abc_NodeBalance_rec( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, Vec_Vec_t * vStorage, int Level, bool fDuplicate, bool fSelective, bool fUpdateLevel ); -static Vec_Ptr_t * Abc_NodeBalanceCone( Abc_Obj_t * pNode, Vec_Vec_t * vSuper, int Level, int fDuplicate, bool fSelective ); -static int Abc_NodeBalanceCone_rec( Abc_Obj_t * pNode, Vec_Ptr_t * vSuper, bool fFirst, bool fDuplicate, bool fSelective ); -static void Abc_NtkMarkCriticalNodes( Abc_Ntk_t * pNtk ); -static Vec_Ptr_t * Abc_NodeBalanceConeExor( Abc_Obj_t * pNode ); - - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Balances the AIG network.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Abc_Ntk_t * Abc_NtkBalance( Abc_Ntk_t * pNtk, bool fDuplicate, bool fSelective, bool fUpdateLevel ) -{ - extern void Abc_NtkHaigTranfer( Abc_Ntk_t * pNtkOld, Abc_Ntk_t * pNtkNew ); - Abc_Ntk_t * pNtkAig; - assert( Abc_NtkIsStrash(pNtk) ); - // compute the required times - if ( fSelective ) - { - Abc_NtkStartReverseLevels( pNtk, 0 ); - Abc_NtkMarkCriticalNodes( pNtk ); - } - // perform balancing - pNtkAig = Abc_NtkStartFrom( pNtk, ABC_NTK_STRASH, ABC_FUNC_AIG ); - // transfer HAIG - Abc_NtkHaigTranfer( pNtk, pNtkAig ); - // perform balancing - Abc_NtkBalancePerform( pNtk, pNtkAig, fDuplicate, fSelective, fUpdateLevel ); - Abc_NtkFinalize( pNtk, pNtkAig ); - // undo the required times - if ( fSelective ) - { - Abc_NtkStopReverseLevels( pNtk ); - Abc_NtkCleanMarkA( pNtk ); - } - if ( pNtk->pExdc ) - pNtkAig->pExdc = Abc_NtkDup( pNtk->pExdc ); - // make sure everything is okay - if ( !Abc_NtkCheck( pNtkAig ) ) - { - printf( "Abc_NtkBalance: The network check has failed.\n" ); - Abc_NtkDelete( pNtkAig ); - return NULL; - } - return pNtkAig; -} - -/**Function************************************************************* - - Synopsis [Balances the AIG network.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkBalancePerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkAig, bool fDuplicate, bool fSelective, bool fUpdateLevel ) -{ - int fCheck = 1; - ProgressBar * pProgress; - Vec_Vec_t * vStorage; - Abc_Obj_t * pNode, * pDriver; - int i; - - // set the level of PIs of AIG according to the arrival times of the old network - Abc_NtkSetNodeLevelsArrival( pNtk ); - // allocate temporary storage for supergates - vStorage = Vec_VecStart( 10 ); - // perform balancing of POs - pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCoNum(pNtk) ); - Abc_NtkForEachCo( pNtk, pNode, i ) - { - Extra_ProgressBarUpdate( pProgress, i, NULL ); - // strash the driver node - pDriver = Abc_ObjFanin0(pNode); - Abc_NodeBalance_rec( pNtkAig, pDriver, vStorage, 0, fDuplicate, fSelective, fUpdateLevel ); - } - Extra_ProgressBarStop( pProgress ); - Vec_VecFree( vStorage ); -} - -/**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 Abc_NodeBalanceFindLeft( Vec_Ptr_t * vSuper ) -{ - Abc_Obj_t * pNodeRight, * pNodeLeft; - 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; - pNodeRight = 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 - pNodeLeft = Vec_PtrEntry( vSuper, Current ); - // if the level of this node is different, quit the loop - if ( Abc_ObjRegular(pNodeLeft)->Level != Abc_ObjRegular(pNodeRight)->Level ) - break; - } - Current++; - // get the node, for which the equality holds - pNodeLeft = Vec_PtrEntry( vSuper, Current ); - assert( Abc_ObjRegular(pNodeLeft)->Level == Abc_ObjRegular(pNodeRight)->Level ); - 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 Abc_NodeBalancePermute( Abc_Ntk_t * pNtkNew, Vec_Ptr_t * vSuper, int LeftBound ) -{ - Abc_Obj_t * pNode1, * pNode2, * pNode3; - int RightBound, i; - // get the right bound - RightBound = Vec_PtrSize(vSuper) - 2; - assert( LeftBound <= RightBound ); - if ( LeftBound == RightBound ) - return; - // get the two last nodes - pNode1 = Vec_PtrEntry( vSuper, RightBound + 1 ); - pNode2 = Vec_PtrEntry( vSuper, RightBound ); - // find the first node that can be shared - for ( i = RightBound; i >= LeftBound; i-- ) - { - pNode3 = Vec_PtrEntry( vSuper, i ); - if ( Abc_AigAndLookup( pNtkNew->pManFunc, pNode1, pNode3 ) ) - { - if ( pNode3 == pNode2 ) - return; - Vec_PtrWriteEntry( vSuper, i, pNode2 ); - Vec_PtrWriteEntry( vSuper, RightBound, pNode3 ); - return; - } - } -/* - // we did not find the node to share, randomize choice - { - int Choice = rand() % (RightBound - LeftBound + 1); - pNode3 = Vec_PtrEntry( vSuper, LeftBound + Choice ); - if ( pNode3 == pNode2 ) - return; - Vec_PtrWriteEntry( vSuper, LeftBound + Choice, pNode2 ); - Vec_PtrWriteEntry( vSuper, RightBound, pNode3 ); - } -*/ -} - -/**Function************************************************************* - - Synopsis [Rebalances the multi-input node rooted at pNodeOld.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Abc_Obj_t * Abc_NodeBalance_rec( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNodeOld, Vec_Vec_t * vStorage, int Level, bool fDuplicate, bool fSelective, bool fUpdateLevel ) -{ - Abc_Aig_t * pMan = pNtkNew->pManFunc; - Abc_Obj_t * pNodeNew, * pNode1, * pNode2; - Vec_Ptr_t * vSuper; - int i, LeftBound; - assert( !Abc_ObjIsComplement(pNodeOld) ); - // return if the result if known - if ( pNodeOld->pCopy ) - return pNodeOld->pCopy; - assert( Abc_ObjIsNode(pNodeOld) ); - // get the implication supergate -// Abc_NodeBalanceConeExor( pNodeOld ); - vSuper = Abc_NodeBalanceCone( pNodeOld, vStorage, Level, fDuplicate, fSelective ); - if ( vSuper->nSize == 0 ) - { // it means that the supergate contains two nodes in the opposite polarity - pNodeOld->pCopy = Abc_ObjNot(Abc_AigConst1(pNtkNew)); - return pNodeOld->pCopy; - } - // for each old node, derive the new well-balanced node - for ( i = 0; i < vSuper->nSize; i++ ) - { - pNodeNew = Abc_NodeBalance_rec( pNtkNew, Abc_ObjRegular(vSuper->pArray[i]), vStorage, Level + 1, fDuplicate, fSelective, fUpdateLevel ); - vSuper->pArray[i] = Abc_ObjNotCond( pNodeNew, Abc_ObjIsComplement(vSuper->pArray[i]) ); - } - if ( vSuper->nSize < 2 ) - printf( "BUG!\n" ); - // sort the new nodes by level in the decreasing order - Vec_PtrSort( vSuper, Abc_NodeCompareLevelsDecrease ); - // balance the nodes - assert( vSuper->nSize > 1 ); - while ( vSuper->nSize > 1 ) - { - // find the left bound on the node to be paired - LeftBound = (!fUpdateLevel)? 0 : Abc_NodeBalanceFindLeft( vSuper ); - // find the node that can be shared (if no such node, randomize choice) - Abc_NodeBalancePermute( pNtkNew, vSuper, LeftBound ); - // pull out the last two nodes - pNode1 = Vec_PtrPop(vSuper); - pNode2 = Vec_PtrPop(vSuper); - Abc_VecObjPushUniqueOrderByLevel( vSuper, Abc_AigAnd(pMan, pNode1, pNode2) ); - } - // make sure the balanced node is not assigned - assert( pNodeOld->pCopy == NULL ); - // mark the old node with the new node - pNodeOld->pCopy = vSuper->pArray[0]; - vSuper->nSize = 0; -// if ( Abc_ObjRegular(pNodeOld->pCopy) == Abc_AigConst1(pNtkNew) ) -// printf( "Constant node\n" ); -// assert( pNodeOld->Level >= Abc_ObjRegular(pNodeOld->pCopy)->Level ); - // update HAIG - if ( Abc_ObjRegular(pNodeOld->pCopy)->pNtk->pHaig ) - Hop_ObjCreateChoice( pNodeOld->pEquiv, Abc_ObjRegular(pNodeOld->pCopy)->pEquiv ); - return pNodeOld->pCopy; -} - -/**Function************************************************************* - - Synopsis [Collects the nodes in the cone delimited by fMarkA==1.] - - Description [Returns -1 if the AND-cone has the same node in both polarities. - Returns 1 if the AND-cone has the same node in the same polarity. Returns 0 - if the AND-cone has no repeated nodes.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Ptr_t * Abc_NodeBalanceCone( Abc_Obj_t * pNode, Vec_Vec_t * vStorage, int Level, int fDuplicate, bool fSelective ) -{ - Vec_Ptr_t * vNodes; - int RetValue, i; - assert( !Abc_ObjIsComplement(pNode) ); - // extend the storage - if ( Vec_VecSize( vStorage ) <= Level ) - Vec_VecPush( vStorage, Level, 0 ); - // get the temporary array of nodes - vNodes = Vec_VecEntry( vStorage, Level ); - Vec_PtrClear( vNodes ); - // collect the nodes in the implication supergate - RetValue = Abc_NodeBalanceCone_rec( pNode, vNodes, 1, fDuplicate, fSelective ); - assert( vNodes->nSize > 1 ); - // unmark the visited nodes - for ( i = 0; i < vNodes->nSize; i++ ) - Abc_ObjRegular((Abc_Obj_t *)vNodes->pArray[i])->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 [Collects the nodes in the cone delimited by fMarkA==1.] - - Description [Returns -1 if the AND-cone has the same node in both polarities. - Returns 1 if the AND-cone has the same node in the same polarity. Returns 0 - if the AND-cone has no repeated nodes.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Abc_NodeBalanceCone_rec( Abc_Obj_t * pNode, Vec_Ptr_t * vSuper, bool fFirst, bool fDuplicate, bool fSelective ) -{ - int RetValue1, RetValue2, i; - // check if the node is visited - if ( Abc_ObjRegular(pNode)->fMarkB ) - { - // check if the node occurs in the same polarity - for ( i = 0; i < vSuper->nSize; i++ ) - if ( vSuper->pArray[i] == pNode ) - return 1; - // check if the node is present in the opposite polarity - for ( i = 0; i < vSuper->nSize; i++ ) - if ( vSuper->pArray[i] == Abc_ObjNot(pNode) ) - return -1; - assert( 0 ); - return 0; - } - // if the new node is complemented or a PI, another gate begins - if ( !fFirst && (Abc_ObjIsComplement(pNode) || !Abc_ObjIsNode(pNode) || !fDuplicate && !fSelective && (Abc_ObjFanoutNum(pNode) > 1)) ) - { - Vec_PtrPush( vSuper, pNode ); - Abc_ObjRegular(pNode)->fMarkB = 1; - return 0; - } - assert( !Abc_ObjIsComplement(pNode) ); - assert( Abc_ObjIsNode(pNode) ); - // go through the branches - RetValue1 = Abc_NodeBalanceCone_rec( Abc_ObjChild0(pNode), vSuper, 0, fDuplicate, fSelective ); - RetValue2 = Abc_NodeBalanceCone_rec( Abc_ObjChild1(pNode), vSuper, 0, fDuplicate, fSelective ); - if ( RetValue1 == -1 || RetValue2 == -1 ) - return -1; - // return 1 if at least one branch has a duplicate - return RetValue1 || RetValue2; -} - - -/**Function************************************************************* - - Synopsis [] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Abc_NodeBalanceConeExor_rec( Abc_Obj_t * pNode, Vec_Ptr_t * vSuper, bool fFirst ) -{ - int RetValue1, RetValue2, i; - // check if the node occurs in the same polarity - for ( i = 0; i < vSuper->nSize; i++ ) - if ( vSuper->pArray[i] == pNode ) - return 1; - // if the new node is complemented or a PI, another gate begins - if ( !fFirst && (!pNode->fExor || !Abc_ObjIsNode(pNode)) ) - { - Vec_PtrPush( vSuper, pNode ); - return 0; - } - assert( !Abc_ObjIsComplement(pNode) ); - assert( Abc_ObjIsNode(pNode) ); - assert( pNode->fExor ); - // go through the branches - RetValue1 = Abc_NodeBalanceConeExor_rec( Abc_ObjFanin0(Abc_ObjFanin0(pNode)), vSuper, 0 ); - RetValue2 = Abc_NodeBalanceConeExor_rec( Abc_ObjFanin1(Abc_ObjFanin0(pNode)), vSuper, 0 ); - if ( RetValue1 == -1 || RetValue2 == -1 ) - return -1; - // return 1 if at least one branch has a duplicate - return RetValue1 || RetValue2; -} - -/**Function************************************************************* - - Synopsis [] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Ptr_t * Abc_NodeBalanceConeExor( Abc_Obj_t * pNode ) -{ - Vec_Ptr_t * vSuper; - if ( !pNode->fExor ) - return NULL; - vSuper = Vec_PtrAlloc( 10 ); - Abc_NodeBalanceConeExor_rec( pNode, vSuper, 1 ); - printf( "%d ", Vec_PtrSize(vSuper) ); - Vec_PtrFree( vSuper ); - return NULL; -} - - - -/**Function************************************************************* - - Synopsis [Collects the nodes in the implication supergate.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Ptr_t * Abc_NodeFindCone_rec( Abc_Obj_t * pNode ) -{ - Vec_Ptr_t * vNodes; - Abc_Obj_t * pNodeC, * pNodeT, * pNodeE; - int RetValue, i; - assert( !Abc_ObjIsComplement(pNode) ); - if ( Abc_ObjIsCi(pNode) ) - return NULL; - // start the new array - vNodes = Vec_PtrAlloc( 4 ); - // if the node is the MUX collect its fanins - if ( Abc_NodeIsMuxType(pNode) ) - { - pNodeC = Abc_NodeRecognizeMux( pNode, &pNodeT, &pNodeE ); - Vec_PtrPush( vNodes, Abc_ObjRegular(pNodeC) ); - Vec_PtrPushUnique( vNodes, Abc_ObjRegular(pNodeT) ); - Vec_PtrPushUnique( vNodes, Abc_ObjRegular(pNodeE) ); - } - else - { - // collect the nodes in the implication supergate - RetValue = Abc_NodeBalanceCone_rec( pNode, vNodes, 1, 1, 0 ); - assert( vNodes->nSize > 1 ); - // unmark the visited nodes - Vec_PtrForEachEntry( vNodes, pNode, i ) - Abc_ObjRegular(pNode)->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; - } - // call for the fanin - Vec_PtrForEachEntry( vNodes, pNode, i ) - { - pNode = Abc_ObjRegular(pNode); - if ( pNode->pCopy ) - continue; - pNode->pCopy = (Abc_Obj_t *)Abc_NodeFindCone_rec( pNode ); - } - return vNodes; -} - -/**Function************************************************************* - - Synopsis [Attaches the implication supergates to internal nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkBalanceAttach( Abc_Ntk_t * pNtk ) -{ - Abc_Obj_t * pNode; - int i; - Abc_NtkCleanCopy( pNtk ); - Abc_NtkForEachCo( pNtk, pNode, i ) - { - pNode = Abc_ObjFanin0(pNode); - if ( pNode->pCopy ) - continue; - pNode->pCopy = (Abc_Obj_t *)Abc_NodeFindCone_rec( pNode ); - } -} - -/**Function************************************************************* - - Synopsis [Attaches the implication supergates to internal nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkBalanceDetach( Abc_Ntk_t * pNtk ) -{ - Abc_Obj_t * pNode; - int i; - Abc_NtkForEachNode( pNtk, pNode, i ) - if ( pNode->pCopy ) - { - Vec_PtrFree( (Vec_Ptr_t *)pNode->pCopy ); - pNode->pCopy = NULL; - } -} - -/**Function************************************************************* - - Synopsis [Compute levels of implication supergates.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Abc_NtkBalanceLevel_rec( Abc_Obj_t * pNode ) -{ - Vec_Ptr_t * vSuper; - Abc_Obj_t * pFanin; - int i, LevelMax; - assert( !Abc_ObjIsComplement(pNode) ); - if ( pNode->Level > 0 ) - return pNode->Level; - if ( Abc_ObjIsCi(pNode) ) - return 0; - vSuper = (Vec_Ptr_t *)pNode->pCopy; - assert( vSuper != NULL ); - LevelMax = 0; - Vec_PtrForEachEntry( vSuper, pFanin, i ) - { - pFanin = Abc_ObjRegular(pFanin); - Abc_NtkBalanceLevel_rec(pFanin); - if ( LevelMax < (int)pFanin->Level ) - LevelMax = pFanin->Level; - } - pNode->Level = LevelMax + 1; - return pNode->Level; -} - - -/**Function************************************************************* - - Synopsis [Compute levels of implication supergates.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkBalanceLevel( Abc_Ntk_t * pNtk ) -{ - Abc_Obj_t * pNode; - int i; - Abc_NtkForEachObj( pNtk, pNode, i ) - pNode->Level = 0; - Abc_NtkForEachCo( pNtk, pNode, i ) - Abc_NtkBalanceLevel_rec( Abc_ObjFanin0(pNode) ); -} - - -/**Function************************************************************* - - Synopsis [Marks the nodes on the critical and near critical paths.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkMarkCriticalNodes( Abc_Ntk_t * pNtk ) -{ - Abc_Obj_t * pNode; - int i, Counter = 0; - Abc_NtkForEachNode( pNtk, pNode, i ) - if ( Abc_ObjRequiredLevel(pNode) - pNode->Level <= 1 ) - pNode->fMarkA = 1, Counter++; - printf( "The number of nodes on the critical paths = %6d (%5.2f %%)\n", Counter, 100.0 * Counter / Abc_NtkNodeNum(pNtk) ); -} - - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |