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Diffstat (limited to 'src/aig/ivy/ivyDfs.c')
| -rw-r--r-- | src/aig/ivy/ivyDfs.c | 493 |
1 files changed, 0 insertions, 493 deletions
diff --git a/src/aig/ivy/ivyDfs.c b/src/aig/ivy/ivyDfs.c deleted file mode 100644 index c27cba31..00000000 --- a/src/aig/ivy/ivyDfs.c +++ /dev/null @@ -1,493 +0,0 @@ -/**CFile**************************************************************** - - FileName [ivyDfs.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [And-Inverter Graph package.] - - Synopsis [DFS collection procedures.] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - May 11, 2006.] - - Revision [$Id: ivyDfs.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "ivy.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Collects nodes in the DFS order.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Ivy_ManDfs_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, Vec_Int_t * vNodes ) -{ - if ( Ivy_ObjIsMarkA(pObj) ) - return; - Ivy_ObjSetMarkA(pObj); - if ( Ivy_ObjIsConst1(pObj) || Ivy_ObjIsCi(pObj) ) - { - if ( p->pHaig == NULL && pObj->pEquiv ) - Ivy_ManDfs_rec( p, Ivy_Regular(pObj->pEquiv), vNodes ); - return; - } -//printf( "visiting node %d\n", pObj->Id ); -/* - if ( pObj->Id == 87 || pObj->Id == 90 ) - { - int y = 0; - } -*/ - assert( Ivy_ObjIsBuf(pObj) || Ivy_ObjIsAnd(pObj) || Ivy_ObjIsExor(pObj) ); - Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes ); - if ( !Ivy_ObjIsBuf(pObj) ) - Ivy_ManDfs_rec( p, Ivy_ObjFanin1(pObj), vNodes ); - if ( p->pHaig == NULL && pObj->pEquiv ) - Ivy_ManDfs_rec( p, Ivy_Regular(pObj->pEquiv), vNodes ); - Vec_IntPush( vNodes, pObj->Id ); - -//printf( "adding node %d with fanins %d and %d and equiv %d (refs = %d)\n", -// pObj->Id, Ivy_ObjFanin0(pObj)->Id, Ivy_ObjFanin1(pObj)->Id, -// pObj->pEquiv? Ivy_Regular(pObj->pEquiv)->Id: -1, Ivy_ObjRefs(pObj) ); -} - -/**Function************************************************************* - - Synopsis [Collects AND/EXOR nodes in the DFS order from CIs to COs.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Int_t * Ivy_ManDfs( Ivy_Man_t * p ) -{ - Vec_Int_t * vNodes; - Ivy_Obj_t * pObj; - int i; - assert( Ivy_ManLatchNum(p) == 0 ); - // make sure the nodes are not marked - Ivy_ManForEachObj( p, pObj, i ) - assert( !pObj->fMarkA && !pObj->fMarkB ); - // collect the nodes - vNodes = Vec_IntAlloc( Ivy_ManNodeNum(p) ); - Ivy_ManForEachPo( p, pObj, i ) - Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes ); - // unmark the collected nodes -// Ivy_ManForEachNodeVec( p, vNodes, pObj, i ) -// Ivy_ObjClearMarkA(pObj); - Ivy_ManForEachObj( p, pObj, i ) - Ivy_ObjClearMarkA(pObj); - // make sure network does not have dangling nodes - assert( Vec_IntSize(vNodes) == Ivy_ManNodeNum(p) + Ivy_ManBufNum(p) ); - return vNodes; -} - -/**Function************************************************************* - - Synopsis [Collects AND/EXOR nodes in the DFS order from CIs to COs.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Int_t * Ivy_ManDfsSeq( Ivy_Man_t * p, Vec_Int_t ** pvLatches ) -{ - Vec_Int_t * vNodes, * vLatches; - Ivy_Obj_t * pObj; - int i; -// assert( Ivy_ManLatchNum(p) > 0 ); - // make sure the nodes are not marked - Ivy_ManForEachObj( p, pObj, i ) - assert( !pObj->fMarkA && !pObj->fMarkB ); - // collect the latches - vLatches = Vec_IntAlloc( Ivy_ManLatchNum(p) ); - Ivy_ManForEachLatch( p, pObj, i ) - Vec_IntPush( vLatches, pObj->Id ); - // collect the nodes - vNodes = Vec_IntAlloc( Ivy_ManNodeNum(p) ); - Ivy_ManForEachPo( p, pObj, i ) - Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes ); - Ivy_ManForEachNodeVec( p, vLatches, pObj, i ) - Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes ); - // unmark the collected nodes -// Ivy_ManForEachNodeVec( p, vNodes, pObj, i ) -// Ivy_ObjClearMarkA(pObj); - Ivy_ManForEachObj( p, pObj, i ) - Ivy_ObjClearMarkA(pObj); - // make sure network does not have dangling nodes -// assert( Vec_IntSize(vNodes) == Ivy_ManNodeNum(p) + Ivy_ManBufNum(p) ); - -// temporary!!! - - if ( pvLatches == NULL ) - Vec_IntFree( vLatches ); - else - *pvLatches = vLatches; - return vNodes; -} - -/**Function************************************************************* - - Synopsis [Collects nodes in the cone.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Ivy_ManCollectCone_rec( Ivy_Obj_t * pObj, Vec_Ptr_t * vCone ) -{ - if ( pObj->fMarkA ) - return; - if ( Ivy_ObjIsBuf(pObj) ) - { - Ivy_ManCollectCone_rec( Ivy_ObjFanin0(pObj), vCone ); - Vec_PtrPush( vCone, pObj ); - return; - } - assert( Ivy_ObjIsNode(pObj) ); - Ivy_ManCollectCone_rec( Ivy_ObjFanin0(pObj), vCone ); - Ivy_ManCollectCone_rec( Ivy_ObjFanin1(pObj), vCone ); - Vec_PtrPushUnique( vCone, pObj ); -} - -/**Function************************************************************* - - Synopsis [Collects nodes in the cone.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Ivy_ManCollectCone( Ivy_Obj_t * pObj, Vec_Ptr_t * vFront, Vec_Ptr_t * vCone ) -{ - Ivy_Obj_t * pTemp; - int i; - assert( !Ivy_IsComplement(pObj) ); - assert( Ivy_ObjIsNode(pObj) ); - // mark the nodes - Vec_PtrForEachEntry( vFront, pTemp, i ) - Ivy_Regular(pTemp)->fMarkA = 1; - assert( pObj->fMarkA == 0 ); - // collect the cone - Vec_PtrClear( vCone ); - Ivy_ManCollectCone_rec( pObj, vCone ); - // unmark the nodes - Vec_PtrForEachEntry( vFront, pTemp, i ) - Ivy_Regular(pTemp)->fMarkA = 0; -} - -/**Function************************************************************* - - Synopsis [Returns the nodes by level.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Vec_t * Ivy_ManLevelize( Ivy_Man_t * p ) -{ - Vec_Vec_t * vNodes; - Ivy_Obj_t * pObj; - int i; - vNodes = Vec_VecAlloc( 100 ); - Ivy_ManForEachObj( p, pObj, i ) - { - assert( !Ivy_ObjIsBuf(pObj) ); - if ( Ivy_ObjIsNode(pObj) ) - Vec_VecPush( vNodes, pObj->Level, pObj ); - } - return vNodes; -} - -/**Function************************************************************* - - Synopsis [Computes required levels for each node.] - - Description [Assumes topological ordering of the nodes.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Int_t * Ivy_ManRequiredLevels( Ivy_Man_t * p ) -{ - Ivy_Obj_t * pObj; - Vec_Int_t * vLevelsR; - Vec_Vec_t * vNodes; - int i, k, Level, LevelMax; - assert( p->vRequired == NULL ); - // start the required times - vLevelsR = Vec_IntStart( Ivy_ManObjIdMax(p) + 1 ); - // iterate through the nodes in the reverse order - vNodes = Ivy_ManLevelize( p ); - Vec_VecForEachEntryReverseReverse( vNodes, pObj, i, k ) - { - Level = Vec_IntEntry( vLevelsR, pObj->Id ) + 1 + Ivy_ObjIsExor(pObj); - if ( Vec_IntEntry( vLevelsR, Ivy_ObjFaninId0(pObj) ) < Level ) - Vec_IntWriteEntry( vLevelsR, Ivy_ObjFaninId0(pObj), Level ); - if ( Vec_IntEntry( vLevelsR, Ivy_ObjFaninId1(pObj) ) < Level ) - Vec_IntWriteEntry( vLevelsR, Ivy_ObjFaninId1(pObj), Level ); - } - Vec_VecFree( vNodes ); - // convert it into the required times - LevelMax = Ivy_ManLevels( p ); -//printf( "max %5d\n",LevelMax ); - Ivy_ManForEachObj( p, pObj, i ) - { - Level = Vec_IntEntry( vLevelsR, pObj->Id ); - Vec_IntWriteEntry( vLevelsR, pObj->Id, LevelMax - Level ); -//printf( "%5d : %5d %5d\n", pObj->Id, Level, LevelMax - Level ); - } - p->vRequired = vLevelsR; - return vLevelsR; -} - -/**Function************************************************************* - - Synopsis [Recursively detects combinational loops.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Ivy_ManIsAcyclic_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj ) -{ - // skip the node if it is already visited - if ( Ivy_ObjIsTravIdPrevious(p, pObj) ) - return 1; - // check if the node is part of the combinational loop - if ( Ivy_ObjIsTravIdCurrent(p, pObj) ) - { - fprintf( stdout, "Manager contains combinational loop!\n" ); - fprintf( stdout, "Node \"%d\" is encountered twice on the following path:\n", Ivy_ObjId(pObj) ); - fprintf( stdout, " %d", Ivy_ObjId(pObj) ); - return 0; - } - // mark this node as a node on the current path - Ivy_ObjSetTravIdCurrent( p, pObj ); - // explore equivalent nodes if pObj is the main node - if ( p->pHaig == NULL && pObj->pEquiv && Ivy_ObjRefs(pObj) > 0 ) - { - Ivy_Obj_t * pTemp; - assert( !Ivy_IsComplement(pObj->pEquiv) ); - for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) ) - { - // traverse the fanin's cone searching for the loop - if ( !Ivy_ManIsAcyclic_rec(p, pTemp) ) - { - // return as soon as the loop is detected - fprintf( stdout, " -> (%d", Ivy_ObjId(pObj) ); - for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) ) - fprintf( stdout, " %d", Ivy_ObjId(pTemp) ); - fprintf( stdout, ")" ); - return 0; - } - } - } - // quite if it is a CI node - if ( Ivy_ObjIsCi(pObj) || Ivy_ObjIsConst1(pObj) ) - { - // mark this node as a visited node - Ivy_ObjSetTravIdPrevious( p, pObj ); - return 1; - } - assert( Ivy_ObjIsNode(pObj) || Ivy_ObjIsBuf(pObj) ); - // traverse the fanin's cone searching for the loop - if ( !Ivy_ManIsAcyclic_rec(p, Ivy_ObjFanin0(pObj)) ) - { - // return as soon as the loop is detected - fprintf( stdout, " -> %d", Ivy_ObjId(pObj) ); - return 0; - } - // traverse the fanin's cone searching for the loop - if ( Ivy_ObjIsNode(pObj) && !Ivy_ManIsAcyclic_rec(p, Ivy_ObjFanin1(pObj)) ) - { - // return as soon as the loop is detected - fprintf( stdout, " -> %d", Ivy_ObjId(pObj) ); - return 0; - } - // mark this node as a visited node - Ivy_ObjSetTravIdPrevious( p, pObj ); - return 1; -} - -/**Function************************************************************* - - Synopsis [Detects combinational loops.] - - Description [This procedure is based on the idea suggested by Donald Chai. - As we traverse the network and visit the nodes, we need to distinquish - three types of nodes: (1) those that are visited for the first time, - (2) those that have been visited in this traversal but are currently not - on the traversal path, (3) those that have been visited and are currently - on the travesal path. When the node of type (3) is encountered, it means - that there is a combinational loop. To mark the three types of nodes, - two new values of the traversal IDs are used.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Ivy_ManIsAcyclic( Ivy_Man_t * p ) -{ - Ivy_Obj_t * pObj; - int fAcyclic, i; - // set the traversal ID for this DFS ordering - Ivy_ManIncrementTravId( p ); - Ivy_ManIncrementTravId( p ); - // pObj->TravId == pNet->nTravIds means "pObj is on the path" - // pObj->TravId == pNet->nTravIds - 1 means "pObj is visited but is not on the path" - // pObj->TravId < pNet->nTravIds - 1 means "pObj is not visited" - // traverse the network to detect cycles - fAcyclic = 1; - Ivy_ManForEachCo( p, pObj, i ) - { - // traverse the output logic cone - if ( fAcyclic = Ivy_ManIsAcyclic_rec(p, Ivy_ObjFanin0(pObj)) ) - continue; - // stop as soon as the first loop is detected - fprintf( stdout, " (cone of %s \"%d\")\n", Ivy_ObjIsLatch(pObj)? "latch" : "PO", Ivy_ObjId(pObj) ); - break; - } - return fAcyclic; -} - -/**Function************************************************************* - - Synopsis [Sets the levels of the nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Ivy_ManSetLevels_rec( Ivy_Obj_t * pObj, int fHaig ) -{ - // quit if the node is visited - if ( Ivy_ObjIsMarkA(pObj) ) - return pObj->Level; - Ivy_ObjSetMarkA(pObj); - // quit if this is a CI - if ( Ivy_ObjIsConst1(pObj) || Ivy_ObjIsCi(pObj) ) - return 0; - assert( Ivy_ObjIsBuf(pObj) || Ivy_ObjIsAnd(pObj) || Ivy_ObjIsExor(pObj) ); - // get levels of the fanins - Ivy_ManSetLevels_rec( Ivy_ObjFanin0(pObj), fHaig ); - if ( !Ivy_ObjIsBuf(pObj) ) - Ivy_ManSetLevels_rec( Ivy_ObjFanin1(pObj), fHaig ); - // get level of the node - if ( Ivy_ObjIsBuf(pObj) ) - pObj->Level = 1 + Ivy_ObjFanin0(pObj)->Level; - else if ( Ivy_ObjIsNode(pObj) ) - pObj->Level = Ivy_ObjLevelNew( pObj ); - else assert( 0 ); - // get level of other choices - if ( fHaig && pObj->pEquiv && Ivy_ObjRefs(pObj) > 0 ) - { - Ivy_Obj_t * pTemp; - unsigned LevelMax = pObj->Level; - for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) ) - { - Ivy_ManSetLevels_rec( pTemp, fHaig ); - LevelMax = IVY_MAX( LevelMax, pTemp->Level ); - } - // get this level - pObj->Level = LevelMax; - for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) ) - pTemp->Level = LevelMax; - } - return pObj->Level; -} - -/**Function************************************************************* - - Synopsis [Sets the levels of the nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Ivy_ManSetLevels( Ivy_Man_t * p, int fHaig ) -{ - Ivy_Obj_t * pObj; - int i, LevelMax; - // check if CIs have choices - if ( fHaig ) - { - Ivy_ManForEachCi( p, pObj, i ) - if ( pObj->pEquiv ) - printf( "CI %d has a choice, which will not be visualized.\n", pObj->Id ); - } - // clean the levels - Ivy_ManForEachObj( p, pObj, i ) - pObj->Level = 0; - // compute the levels - LevelMax = 0; - Ivy_ManForEachCo( p, pObj, i ) - { - Ivy_ManSetLevels_rec( Ivy_ObjFanin0(pObj), fHaig ); - LevelMax = IVY_MAX( LevelMax, (int)Ivy_ObjFanin0(pObj)->Level ); - } - // compute levels of nodes without fanout - Ivy_ManForEachObj( p, pObj, i ) - if ( (Ivy_ObjIsNode(pObj) || Ivy_ObjIsBuf(pObj)) && Ivy_ObjRefs(pObj) == 0 ) - { - Ivy_ManSetLevels_rec( pObj, fHaig ); - LevelMax = IVY_MAX( LevelMax, (int)pObj->Level ); - } - // clean the marks - Ivy_ManForEachObj( p, pObj, i ) - Ivy_ObjClearMarkA(pObj); - return LevelMax; -} - - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |