/**CFile**************************************************************** FileName [ivyFastMap.c] SystemName [ABC: Logic synthesis and verification system.] PackageName [And-Inverter Graph package.] Synopsis [Fast FPGA mapping.] Author [Alan Mishchenko] Affiliation [UC Berkeley] Date [Ver. 1.0. Started - May 11, 2006.] Revision [$Id: ivyFastMap.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $] ***********************************************************************/ #include "ivy.h" //////////////////////////////////////////////////////////////////////// /// DECLARATIONS /// //////////////////////////////////////////////////////////////////////// #define IVY_INFINITY 10000 typedef struct Ivy_SuppMan_t_ Ivy_SuppMan_t; struct Ivy_SuppMan_t_ { int nLimit; // the limit on the number of inputs int nObjs; // the number of entries int nSize; // size of each entry in bytes char * pMem; // memory allocated Vec_Vec_t * vLuts; // the array of nodes used in the mapping }; typedef struct Ivy_Supp_t_ Ivy_Supp_t; struct Ivy_Supp_t_ { char nSize; // the number of support nodes char fMark; // multipurpose mask char fMark2; // multipurpose mask char fMark3; // multipurpose mask int nRefs; // the number of references short Delay; // the delay of the node short DelayR; // the reverse delay of the node int pArray[0]; // the support nodes }; static inline Ivy_Supp_t * Ivy_ObjSupp( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { return (Ivy_Supp_t *)(((Ivy_SuppMan_t*)pAig->pData)->pMem + pObj->Id * ((Ivy_SuppMan_t*)pAig->pData)->nSize); } static inline Ivy_Supp_t * Ivy_ObjSuppStart( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Supp_t * pSupp; pSupp = Ivy_ObjSupp( pAig, pObj ); pSupp->fMark = 0; pSupp->Delay = 0; pSupp->nSize = 1; pSupp->pArray[0] = pObj->Id; return pSupp; } static int Ivy_FastMapPrint( Ivy_Man_t * pAig, int Time ); static int Ivy_FastMapDelay( Ivy_Man_t * pAig ); static int Ivy_FastMapArea( Ivy_Man_t * pAig ); static void Ivy_FastMapNode( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit ); static int Ivy_FastMapMerge( Ivy_Supp_t * pSupp0, Ivy_Supp_t * pSupp1, Ivy_Supp_t * pSupp, int nLimit ); static void Ivy_FastMapRequired( Ivy_Man_t * pAig, int Delay ); static void Ivy_FastMapRecover( Ivy_Man_t * pAig, int nLimit ); static int Ivy_FastMapNodeDelay( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ); static int Ivy_FastMapNodeAreaRefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ); static int Ivy_FastMapNodeAreaDerefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ); static void Ivy_FastMapNodeRecover( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld ); extern int s_MappingTime; extern int s_MappingMem; //////////////////////////////////////////////////////////////////////// /// FUNCTION DEFINITIONS /// //////////////////////////////////////////////////////////////////////// /**Function************************************************************* Synopsis [Performs fast K-LUT mapping of the AIG.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapPerform( Ivy_Man_t * pAig, int nLimit ) { Ivy_SuppMan_t * pMan; Ivy_Obj_t * pObj; int i, Delay, clk, clkTotal = clock(); // start the memory for supports pMan = ALLOC( Ivy_SuppMan_t, 1 ); memset( pMan, 0, sizeof(Ivy_SuppMan_t) ); pMan->nLimit = nLimit; pMan->nObjs = Ivy_ManObjIdMax(pAig) + 1; pMan->nSize = sizeof(Ivy_Supp_t) + nLimit * sizeof(int); pMan->pMem = (char *)malloc( pMan->nObjs * pMan->nSize ); pMan->vLuts = Vec_VecAlloc( 100 ); pAig->pData = pMan; clk = clock(); // set the PI mapping Ivy_ObjSuppStart( pAig, Ivy_ManConst1(pAig) ); Ivy_ManForEachPi( pAig, pObj, i ) Ivy_ObjSuppStart( pAig, pObj ); // iterate through all nodes in the topological order Ivy_ManForEachNode( pAig, pObj, i ) Ivy_FastMapNode( pAig, pObj, nLimit ); // find the best arrival time and area printf( "Delay oriented mapping: " ); Delay = Ivy_FastMapPrint( pAig, clock() - clk ); // perform area recovery clk = clock(); Ivy_FastMapRequired( pAig, Delay ); // PRT( "Required time computation", clock() - clk ); // remap the nodes Ivy_FastMapRecover( pAig, nLimit ); printf( "Area recovery : " ); Delay = Ivy_FastMapPrint( pAig, clock() - clk ); // perform area recovery clk = clock(); Ivy_FastMapRequired( pAig, Delay ); // PRT( "Required time computation", clock() - clk ); // remap the nodes Ivy_FastMapRecover( pAig, nLimit ); printf( "Area recovery : " ); Delay = Ivy_FastMapPrint( pAig, clock() - clk ); s_MappingTime = clock() - clkTotal; s_MappingMem = pMan->nObjs * pMan->nSize; } /**Function************************************************************* Synopsis [Cleans memory used for decomposition.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapStop( Ivy_Man_t * pAig ) { Ivy_SuppMan_t * p = pAig->pData; Vec_VecFree( p->vLuts ); free( p->pMem ); free( p ); pAig->pData = NULL; } /**Function************************************************************* Synopsis [Prints statistics.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapPrint( Ivy_Man_t * pAig, int Time ) { int Delay, Area; Delay = Ivy_FastMapDelay( pAig ); Area = Ivy_FastMapArea( pAig ); printf( "Delay = %3d. Area = %6d. ", Delay, Area ); PRT( "Time", Time ); return Delay; } /**Function************************************************************* Synopsis [Computes delay after LUT mapping.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapDelay( Ivy_Man_t * pAig ) { Ivy_Supp_t * pSupp; Ivy_Obj_t * pObj; int i, DelayMax = 0; Ivy_ManForEachPo( pAig, pObj, i ) { pObj = Ivy_ObjFanin0(pObj); if ( !Ivy_ObjIsNode(pObj) ) continue; pSupp = Ivy_ObjSupp( pAig, pObj ); if ( DelayMax < pSupp->Delay ) DelayMax = pSupp->Delay; } return DelayMax; } /**Function************************************************************* Synopsis [Computes area after mapping.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapArea_rec( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Vec_t * vLuts ) { Ivy_Supp_t * pSupp; int i, Counter; pSupp = Ivy_ObjSupp( pAig, pObj ); // skip visited nodes and PIs if ( pSupp->fMark || pSupp->nSize == 1 ) return 0; pSupp->fMark = 1; // compute the area of this node Counter = 0; for ( i = 0; i < pSupp->nSize; i++ ) Counter += Ivy_FastMapArea_rec( pAig, Ivy_ManObj(pAig, pSupp->pArray[i]), vLuts ); // add the node to the array of LUTs Vec_VecPush( vLuts, pSupp->Delay, pObj ); return 1 + Counter; } /**Function************************************************************* Synopsis [Computes area after mapping.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapArea( Ivy_Man_t * pAig ) { Vec_Vec_t * vLuts; Ivy_Obj_t * pObj; int i, Counter = 0; // get the array to store the nodes vLuts = ((Ivy_SuppMan_t *)pAig->pData)->vLuts; Vec_VecClear( vLuts ); // explore starting from each node Ivy_ManForEachPo( pAig, pObj, i ) Counter += Ivy_FastMapArea_rec( pAig, Ivy_ObjFanin0(pObj), vLuts ); // clean the marks Ivy_ManForEachNode( pAig, pObj, i ) Ivy_ObjSupp( pAig, pObj )->fMark = 0; return Counter; } /**Function************************************************************* Synopsis [Performs fast mapping for one node.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapNode( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit ) { Ivy_Supp_t * pSupp0, * pSupp1, * pSupp; int RetValue; assert( Ivy_ObjIsNode(pObj) ); // get the supports pSupp0 = Ivy_ObjSupp( pAig, Ivy_ObjFanin0(pObj) ); pSupp1 = Ivy_ObjSupp( pAig, Ivy_ObjFanin1(pObj) ); pSupp = Ivy_ObjSupp( pAig, pObj ); pSupp->fMark = 0; // get the delays if ( pSupp0->Delay == pSupp1->Delay ) pSupp->Delay = (pSupp0->Delay == 0) ? pSupp0->Delay + 1: pSupp0->Delay; else if ( pSupp0->Delay > pSupp1->Delay ) { pSupp->Delay = pSupp0->Delay; pSupp1 = Ivy_ObjSupp( pAig, Ivy_ManConst1(pAig) ); pSupp1->pArray[0] = Ivy_ObjFaninId1(pObj); } else // if ( pSupp0->Delay < pSupp1->Delay ) { pSupp->Delay = pSupp1->Delay; pSupp0 = Ivy_ObjSupp( pAig, Ivy_ManConst1(pAig) ); pSupp0->pArray[0] = Ivy_ObjFaninId0(pObj); } // merge the cuts if ( pSupp0->nSize < pSupp1->nSize ) RetValue = Ivy_FastMapMerge( pSupp1, pSupp0, pSupp, nLimit ); else RetValue = Ivy_FastMapMerge( pSupp0, pSupp1, pSupp, nLimit ); if ( !RetValue ) { pSupp->Delay++; pSupp->nSize = 2; pSupp->pArray[0] = Ivy_ObjFaninId0(pObj); pSupp->pArray[1] = Ivy_ObjFaninId1(pObj); } assert( pSupp->Delay > 0 ); } /**Function************************************************************* Synopsis [Merges two supports] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapMerge( Ivy_Supp_t * pSupp0, Ivy_Supp_t * pSupp1, Ivy_Supp_t * pSupp, int nLimit ) { int i, k, c; assert( pSupp0->nSize >= pSupp1->nSize ); // the case of the largest cut sizes if ( pSupp0->nSize == nLimit && pSupp1->nSize == nLimit ) { for ( i = 0; i < pSupp0->nSize; i++ ) if ( pSupp0->pArray[i] != pSupp1->pArray[i] ) return 0; for ( i = 0; i < pSupp0->nSize; i++ ) pSupp->pArray[i] = pSupp0->pArray[i]; pSupp->nSize = pSupp0->nSize; return 1; } // the case when one of the cuts is the largest if ( pSupp0->nSize == nLimit ) { for ( i = 0; i < pSupp1->nSize; i++ ) { for ( k = pSupp0->nSize - 1; k >= 0; k-- ) if ( pSupp0->pArray[k] == pSupp1->pArray[i] ) break; if ( k == -1 ) // did not find return 0; } for ( i = 0; i < pSupp0->nSize; i++ ) pSupp->pArray[i] = pSupp0->pArray[i]; pSupp->nSize = pSupp0->nSize; return 1; } // compare two cuts with different numbers i = k = 0; for ( c = 0; c < nLimit; c++ ) { if ( k == pSupp1->nSize ) { if ( i == pSupp0->nSize ) { pSupp->nSize = c; return 1; } pSupp->pArray[c] = pSupp0->pArray[i++]; continue; } if ( i == pSupp0->nSize ) { if ( k == pSupp1->nSize ) { pSupp->nSize = c; return 1; } pSupp->pArray[c] = pSupp1->pArray[k++]; continue; } if ( pSupp0->pArray[i] < pSupp1->pArray[k] ) { pSupp->pArray[c] = pSupp0->pArray[i++]; continue; } if ( pSupp0->pArray[i] > pSupp1->pArray[k] ) { pSupp->pArray[c] = pSupp1->pArray[k++]; continue; } pSupp->pArray[c] = pSupp0->pArray[i++]; k++; } if ( i < pSupp0->nSize || k < pSupp1->nSize ) return 0; pSupp->nSize = c; return 1; } /**Function************************************************************* Synopsis [Creates integer vector with the support of the node.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapReadSupp( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Int_t * vLeaves ) { Ivy_Supp_t * pSupp; pSupp = Ivy_ObjSupp( pAig, pObj ); vLeaves->nCap = 8; vLeaves->nSize = pSupp->nSize; vLeaves->pArray = pSupp->pArray; } /**Function************************************************************* Synopsis [Computes the required times for each node.] Description [Sets reference counters for each node.] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapRequired( Ivy_Man_t * pAig, int Delay ) { Vec_Vec_t * vLuts; Vec_Ptr_t * vNodes; Ivy_Obj_t * pObj; Ivy_Supp_t * pSupp, * pSuppF; int i, k, c; // clean the required times Ivy_ManForEachPi( pAig, pObj, i ) { pSupp = Ivy_ObjSupp( pAig, pObj ); pSupp->DelayR = IVY_INFINITY; pSupp->nRefs = 0; } Ivy_ManForEachNode( pAig, pObj, i ) { pSupp = Ivy_ObjSupp( pAig, pObj ); pSupp->DelayR = IVY_INFINITY; pSupp->nRefs = 0; } // set the required times of the POs Ivy_ManForEachPo( pAig, pObj, i ) { pSupp = Ivy_ObjSupp( pAig, Ivy_ObjFanin0(pObj) ); pSupp->DelayR = Delay; pSupp->nRefs++; } // get the levelized nodes used in the mapping vLuts = ((Ivy_SuppMan_t *)pAig->pData)->vLuts; // propagate the required times Vec_VecForEachLevelReverse( vLuts, vNodes, i ) Vec_PtrForEachEntry( vNodes, pObj, k ) { pSupp = Ivy_ObjSupp( pAig, pObj ); assert( pSupp->nRefs > 0 ); for ( c = 0; c < pSupp->nSize; c++ ) { pSuppF = Ivy_ObjSupp( pAig, Ivy_ManObj(pAig, pSupp->pArray[c]) ); pSuppF->DelayR = IVY_MIN( pSuppF->DelayR, pSupp->DelayR - 1 ); pSuppF->nRefs++; } } /* // print out some of the required times Ivy_ManForEachPi( pAig, pObj, i ) { pSupp = Ivy_ObjSupp( pAig, pObj ); printf( "%d ", pSupp->DelayR ); } printf( "\n" ); */ } /**Function************************************************************* Synopsis [Performs area recovery for each node.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapRecover( Ivy_Man_t * pAig, int nLimit ) { Vec_Ptr_t * vFront, * vFrontOld; Ivy_Obj_t * pObj; int i; vFront = Vec_PtrAlloc( nLimit ); vFrontOld = Vec_PtrAlloc( nLimit ); Ivy_ManCleanTravId( pAig ); // iterate through all nodes in the topological order Ivy_ManForEachNode( pAig, pObj, i ) Ivy_FastMapNodeRecover( pAig, pObj, nLimit, vFront, vFrontOld ); Vec_PtrFree( vFrontOld ); Vec_PtrFree( vFront ); } /**Function************************************************************* Synopsis [Computes the delay of the cut rooted at this node.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapNodeDelay( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Supp_t * pSupp, * pSuppF; int c, Delay = 0; pSupp = Ivy_ObjSupp( pAig, pObj ); for ( c = 0; c < pSupp->nSize; c++ ) { pSuppF = Ivy_ObjSupp( pAig, Ivy_ManObj(pAig, pSupp->pArray[c]) ); Delay = IVY_MAX( Delay, pSuppF->Delay ); } return 1 + Delay; } /**function************************************************************* synopsis [References the cut.] description [This procedure is similar to the procedure NodeReclaim.] sideeffects [] seealso [] ***********************************************************************/ int Ivy_FastMapNodeRef( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Supp_t * pSupp, * pSuppF; Ivy_Obj_t * pNodeChild; int aArea, i; // start the area of this cut aArea = 1; // go through the children pSupp = Ivy_ObjSupp( pAig, pObj ); assert( pSupp->nSize > 1 ); for ( i = 0; i < pSupp->nSize; i++ ) { pNodeChild = Ivy_ManObj(pAig, pSupp->pArray[i]); pSuppF = Ivy_ObjSupp( pAig, pNodeChild ); assert( pSuppF->nRefs >= 0 ); if ( pSuppF->nRefs++ > 0 ) continue; if ( pSuppF->nSize == 1 ) continue; aArea += Ivy_FastMapNodeRef( pAig, pNodeChild ); } return aArea; } /**function************************************************************* synopsis [Dereferences the cut.] description [This procedure is similar to the procedure NodeRecusiveDeref.] sideeffects [] seealso [] ***********************************************************************/ int Ivy_FastMapNodeDeref( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Supp_t * pSupp, * pSuppF; Ivy_Obj_t * pNodeChild; int aArea, i; // start the area of this cut aArea = 1; // go through the children pSupp = Ivy_ObjSupp( pAig, pObj ); assert( pSupp->nSize > 1 ); for ( i = 0; i < pSupp->nSize; i++ ) { pNodeChild = Ivy_ManObj(pAig, pSupp->pArray[i]); pSuppF = Ivy_ObjSupp( pAig, pNodeChild ); assert( pSuppF->nRefs > 0 ); if ( --pSuppF->nRefs > 0 ) continue; if ( pSuppF->nSize == 1 ) continue; aArea += Ivy_FastMapNodeDeref( pAig, pNodeChild ); } return aArea; } /**function************************************************************* synopsis [Computes the exact area associated with the cut.] description [] sideeffects [] seealso [] ***********************************************************************/ int Ivy_FastMapNodeAreaRefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Supp_t * pSupp; int aResult, aResult2; if ( Ivy_ObjIsCi(pObj) ) return 0; assert( Ivy_ObjIsNode(pObj) ); pSupp = Ivy_ObjSupp( pAig, pObj ); assert( pSupp->nRefs > 0 ); aResult = Ivy_FastMapNodeDeref( pAig, pObj ); aResult2 = Ivy_FastMapNodeRef( pAig, pObj ); assert( aResult == aResult2 ); return aResult; } /**function************************************************************* synopsis [Computes the exact area associated with the cut.] description [] sideeffects [] seealso [] ***********************************************************************/ int Ivy_FastMapNodeAreaDerefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Supp_t * pSupp; int aResult, aResult2; if ( Ivy_ObjIsCi(pObj) ) return 0; assert( Ivy_ObjIsNode(pObj) ); pSupp = Ivy_ObjSupp( pAig, pObj ); assert( pSupp->nRefs == 0 ); aResult2 = Ivy_FastMapNodeRef( pAig, pObj ); aResult = Ivy_FastMapNodeDeref( pAig, pObj ); assert( aResult == aResult2 ); return aResult; } /**Function************************************************************* Synopsis [Counts the number of nodes with no external fanout.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapCutCost( Ivy_Man_t * pAig, Vec_Ptr_t * vFront ) { Ivy_Supp_t * pSuppF; Ivy_Obj_t * pFanin; int i, Counter = 0; Vec_PtrForEachEntry( vFront, pFanin, i ) { pSuppF = Ivy_ObjSupp( pAig, pFanin ); if ( pSuppF->nRefs == 1 ) Counter++; } return Counter; } /**Function************************************************************* Synopsis [Performs area recovery for each node.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapMark_rec( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { if ( Ivy_ObjIsTravIdCurrent(pAig, pObj) ) return; assert( Ivy_ObjIsNode(pObj) ); Ivy_FastMapMark_rec( pAig, Ivy_ObjFanin0(pObj) ); Ivy_FastMapMark_rec( pAig, Ivy_ObjFanin1(pObj) ); Ivy_ObjSetTravIdCurrent(pAig, pObj); } /**Function************************************************************* Synopsis [Returns 1 if the number of fanins will grow.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapNodeWillGrow( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Obj_t * pFanin0, * pFanin1; assert( Ivy_ObjIsNode(pObj) ); pFanin0 = Ivy_ObjFanin0(pObj); pFanin1 = Ivy_ObjFanin1(pObj); return !Ivy_ObjIsTravIdCurrent(pAig, pFanin0) && !Ivy_ObjIsTravIdCurrent(pAig, pFanin1); } /**Function************************************************************* Synopsis [Returns the increase in the number of fanins with no external refs.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapNodeFaninCost( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) { Ivy_Supp_t * pSuppF; Ivy_Obj_t * pFanin; int Counter = 0; assert( Ivy_ObjIsNode(pObj) ); // check if the node has external refs pSuppF = Ivy_ObjSupp( pAig, pObj ); if ( pSuppF->nRefs == 1 ) Counter--; // increment the number of fanins without external refs pFanin = Ivy_ObjFanin0(pObj); pSuppF = Ivy_ObjSupp( pAig, pFanin ); if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) && pSuppF->nRefs == 1 ) Counter++; // increment the number of fanins without external refs pFanin = Ivy_ObjFanin1(pObj); pSuppF = Ivy_ObjSupp( pAig, pFanin ); if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) && pSuppF->nRefs == 1 ) Counter++; return Counter; } /**Function************************************************************* Synopsis [Updates the frontier.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapNodeFaninUpdate( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Ptr_t * vFront ) { Ivy_Obj_t * pFanin; assert( Ivy_ObjIsNode(pObj) ); Vec_PtrRemove( vFront, pObj ); pFanin = Ivy_ObjFanin0(pObj); if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) ) { Ivy_ObjSetTravIdCurrent(pAig, pFanin); Vec_PtrPush( vFront, pFanin ); } pFanin = Ivy_ObjFanin1(pObj); if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) ) { Ivy_ObjSetTravIdCurrent(pAig, pFanin); Vec_PtrPush( vFront, pFanin ); } } /**Function************************************************************* Synopsis [Compacts the number of external refs.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapNodeFaninCompact0( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront ) { Ivy_Obj_t * pFanin; int i; Vec_PtrForEachEntry( vFront, pFanin, i ) { if ( Ivy_ObjIsCi(pFanin) ) continue; if ( Ivy_FastMapNodeWillGrow(pAig, pFanin) ) continue; if ( Ivy_FastMapNodeFaninCost(pAig, pFanin) <= 0 ) { Ivy_FastMapNodeFaninUpdate( pAig, pFanin, vFront ); return 1; } } return 0; } /**Function************************************************************* Synopsis [Compacts the number of external refs.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapNodeFaninCompact1( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront ) { Ivy_Obj_t * pFanin; int i; Vec_PtrForEachEntry( vFront, pFanin, i ) { if ( Ivy_ObjIsCi(pFanin) ) continue; if ( Ivy_FastMapNodeFaninCost(pAig, pFanin) < 0 ) { Ivy_FastMapNodeFaninUpdate( pAig, pFanin, vFront ); return 1; } } return 0; } /**Function************************************************************* Synopsis [Compacts the number of external refs.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapNodeFaninCompact2( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront ) { Ivy_Obj_t * pFanin; int i; Vec_PtrForEachEntry( vFront, pFanin, i ) { if ( Ivy_ObjIsCi(pFanin) ) continue; if ( Ivy_FastMapNodeFaninCost(pAig, pFanin) <= 0 ) { Ivy_FastMapNodeFaninUpdate( pAig, pFanin, vFront ); return 1; } } return 0; } /**Function************************************************************* Synopsis [Compacts the number of external refs.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ int Ivy_FastMapNodeFaninCompact_int( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront ) { if ( Ivy_FastMapNodeFaninCompact0(pAig, pObj, nLimit, vFront) ) return 1; if ( Vec_PtrSize(vFront) < nLimit && Ivy_FastMapNodeFaninCompact1(pAig, pObj, nLimit, vFront) ) return 1; if ( Vec_PtrSize(vFront) < nLimit && Ivy_FastMapNodeFaninCompact2(pAig, pObj, nLimit, vFront) ) return 1; assert( Vec_PtrSize(vFront) <= nLimit ); return 0; } /**Function************************************************************* Synopsis [Compacts the number of external refs.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapNodeFaninCompact( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront ) { while ( Ivy_FastMapNodeFaninCompact_int( pAig, pObj, nLimit, vFront ) ); } /**Function************************************************************* Synopsis [Prepares node mapping.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapNodePrepare( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld ) { Ivy_Supp_t * pSupp; Ivy_Obj_t * pFanin; int i; pSupp = Ivy_ObjSupp( pAig, pObj ); // expand the cut downwards from the given place Vec_PtrClear( vFront ); Vec_PtrClear( vFrontOld ); Ivy_ManIncrementTravId( pAig ); for ( i = 0; i < pSupp->nSize; i++ ) { pFanin = Ivy_ManObj(pAig, pSupp->pArray[i]); Vec_PtrPush( vFront, pFanin ); Vec_PtrPush( vFrontOld, pFanin ); Ivy_ObjSetTravIdCurrent( pAig, pFanin ); } // mark the nodes in the cone Ivy_FastMapMark_rec( pAig, pObj ); } /**Function************************************************************* Synopsis [Updates the frontier.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapNodeUpdate( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Ptr_t * vFront ) { Ivy_Supp_t * pSupp; Ivy_Obj_t * pFanin; int i; pSupp = Ivy_ObjSupp( pAig, pObj ); // deref node's cut Ivy_FastMapNodeDeref( pAig, pObj ); // update the node's cut pSupp->nSize = Vec_PtrSize(vFront); Vec_PtrForEachEntry( vFront, pFanin, i ) pSupp->pArray[i] = pFanin->Id; // ref the new cut Ivy_FastMapNodeRef( pAig, pObj ); } /**Function************************************************************* Synopsis [Performs area recovery for each node.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapNodeRecover2( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld ) { Ivy_Supp_t * pSupp; int CostBef, CostAft; int AreaBef, AreaAft; pSupp = Ivy_ObjSupp( pAig, pObj ); // if ( pSupp->nRefs == 0 ) // return; if ( pSupp->nRefs == 0 ) AreaBef = Ivy_FastMapNodeAreaDerefed( pAig, pObj ); else AreaBef = Ivy_FastMapNodeAreaRefed( pAig, pObj ); // get the area if ( AreaBef == 1 ) return; if ( pSupp->nRefs == 0 ) { pSupp->nRefs = 1000000; Ivy_FastMapNodeRef( pAig, pObj ); } // the cut is non-trivial Ivy_FastMapNodePrepare( pAig, pObj, nLimit, vFront, vFrontOld ); // iteratively modify the cut CostBef = Ivy_FastMapCutCost( pAig, vFront ); Ivy_FastMapNodeFaninCompact( pAig, pObj, nLimit, vFront ); CostAft = Ivy_FastMapCutCost( pAig, vFront ); assert( CostBef >= CostAft ); // update the node Ivy_FastMapNodeUpdate( pAig, pObj, vFront ); // get the new area AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj ); if ( AreaAft > AreaBef ) { Ivy_FastMapNodeUpdate( pAig, pObj, vFrontOld ); AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj ); assert( AreaAft == AreaBef ); } if ( pSupp->nRefs == 1000000 ) { pSupp->nRefs = 0; Ivy_FastMapNodeDeref( pAig, pObj ); } } /**Function************************************************************* Synopsis [Performs area recovery for each node.] Description [] SideEffects [] SeeAlso [] ***********************************************************************/ void Ivy_FastMapNodeRecover( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld ) { Ivy_Supp_t * pSupp; int CostBef, CostAft; int AreaBef, AreaAft; pSupp = Ivy_ObjSupp( pAig, pObj ); if ( pSupp->nRefs == 0 ) return; // get the area AreaBef = Ivy_FastMapNodeAreaRefed( pAig, pObj ); if ( AreaBef == 1 ) return; // the cut is non-trivial Ivy_FastMapNodePrepare( pAig, pObj, nLimit, vFront, vFrontOld ); // iteratively modify the cut CostBef = Ivy_FastMapCutCost( pAig, vFront ); Ivy_FastMapNodeFaninCompact( pAig, pObj, nLimit, vFront ); CostAft = Ivy_FastMapCutCost( pAig, vFront ); assert( CostBef >= CostAft ); // update the node Ivy_FastMapNodeUpdate( pAig, pObj, vFront ); // get the new area AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj ); if ( AreaAft > AreaBef ) { Ivy_FastMapNodeUpdate( pAig, pObj, vFrontOld ); AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj ); assert( AreaAft == AreaBef ); } } //////////////////////////////////////////////////////////////////////// /// END OF FILE /// ////////////////////////////////////////////////////////////////////////