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Diffstat (limited to 'src/opt/fret/fretTime.c')
| -rw-r--r-- | src/opt/fret/fretTime.c | 768 |
1 files changed, 0 insertions, 768 deletions
diff --git a/src/opt/fret/fretTime.c b/src/opt/fret/fretTime.c deleted file mode 100644 index 47e90519..00000000 --- a/src/opt/fret/fretTime.c +++ /dev/null @@ -1,768 +0,0 @@ -/**CFile**************************************************************** - - FileName [fretTime.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Flow-based retiming package.] - - Synopsis [Delay-constrained retiming code.] - - Author [Aaron Hurst] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - January 1, 2008.] - - Revision [$Id: fretTime.c,v 1.00 2008/01/01 00:00:00 ahurst Exp $] - -***********************************************************************/ - -#include "abc.h" -#include "vec.h" -#include "fretime.h" - -ABC_NAMESPACE_IMPL_START - - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -static void Abc_FlowRetime_Dfs_forw( Abc_Obj_t * pObj, Vec_Ptr_t *vNodes ); -static void Abc_FlowRetime_Dfs_back( Abc_Obj_t * pObj, Vec_Ptr_t *vNodes ); - -static void Abc_FlowRetime_ConstrainExact_forw( Abc_Obj_t * pObj ); -static void Abc_FlowRetime_ConstrainExact_back( Abc_Obj_t * pObj ); -static void Abc_FlowRetime_ConstrainConserv_forw( Abc_Ntk_t * pNtk ); -static void Abc_FlowRetime_ConstrainConserv_back( Abc_Ntk_t * pNtk ); - - -void trace2(Abc_Obj_t *pObj) { - Abc_Obj_t *pNext; - int i; - - print_node(pObj); - Abc_ObjForEachFanin(pObj, pNext, i) - if (pNext->Level >= pObj->Level - 1) { - trace2(pNext); - break; - } -} - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - - -/**Function************************************************************* - - Synopsis [Initializes timing] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_FlowRetime_InitTiming( Abc_Ntk_t *pNtk ) { - - pManMR->nConservConstraints = pManMR->nExactConstraints = 0; - - pManMR->vExactNodes = Vec_PtrAlloc(1000); - - pManMR->vTimeEdges = ALLOC( Vec_Ptr_t, Abc_NtkObjNumMax(pNtk)+1 ); - assert(pManMR->vTimeEdges); - memset(pManMR->vTimeEdges, 0, (Abc_NtkObjNumMax(pNtk)+1) * sizeof(Vec_Ptr_t) ); -} - - -/**Function************************************************************* - - Synopsis [Marks nodes with conservative constraints.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_FlowRetime_ConstrainConserv( Abc_Ntk_t * pNtk ) { - Abc_Obj_t *pObj; - int i; - void *pArray; - - // clear all exact constraints - pManMR->nExactConstraints = 0; - while( Vec_PtrSize( pManMR->vExactNodes )) { - pObj = Vec_PtrPop( pManMR->vExactNodes ); - - if ( Vec_PtrSize( FTIMEEDGES(pObj) )) { - pArray = Vec_PtrReleaseArray( FTIMEEDGES(pObj) ); - FREE( pArray ); - } - } - -#if !defined(IGNORE_TIMING) - if (pManMR->fIsForward) { - Abc_FlowRetime_ConstrainConserv_forw(pNtk); - } else { - Abc_FlowRetime_ConstrainConserv_back(pNtk); - } -#endif - - Abc_NtkForEachObj( pNtk, pObj, i) - assert( !Vec_PtrSize(FTIMEEDGES(pObj)) ); -} - - -void Abc_FlowRetime_ConstrainConserv_forw( Abc_Ntk_t * pNtk ) { - Vec_Ptr_t *vNodes = pManMR->vNodes; - Abc_Obj_t *pObj, *pNext, *pBi, *pBo; - int i, j; - - assert(!Vec_PtrSize( vNodes )); - pManMR->nConservConstraints = 0; - - // 1. hard constraints - - // (i) collect TFO of PIs - Abc_NtkIncrementTravId(pNtk); - Abc_NtkForEachPi(pNtk, pObj, i) - Abc_FlowRetime_Dfs_forw( pObj, vNodes ); - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanin( pObj, pNext, j ) - { - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < pNext->Level ) - pObj->Level = pNext->Level; - } - pObj->Level += Abc_ObjIsNode(pObj) ? 1 : 0; - - if ( Abc_ObjIsBi(pObj) ) - pObj->fMarkA = 1; - - assert(pObj->Level <= pManMR->maxDelay); - } - - // collect TFO of latches - // seed arrival times from BIs - Vec_PtrClear(vNodes); - Abc_NtkIncrementTravId(pNtk); - Abc_NtkForEachLatch(pNtk, pObj, i) { - pBo = Abc_ObjFanout0( pObj ); - pBi = Abc_ObjFanin0( pObj ); - - Abc_NodeSetTravIdCurrent( pObj ); - Abc_FlowRetime_Dfs_forw( pBo, vNodes ); - - if (pBi->fMarkA) { - pBi->fMarkA = 0; - pObj->Level = pBi->Level; - assert(pObj->Level <= pManMR->maxDelay); - } else - pObj->Level = 0; - } - -#if defined(DEBUG_CHECK) - // DEBUG: check DFS ordering - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->fMarkB = 1; - - Abc_ObjForEachFanin( pObj, pNext, j ) - if ( Abc_NodeIsTravIdCurrent(pNext) && !Abc_ObjIsLatch(pNext)) - assert(pNext->fMarkB); - } - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) - pObj->fMarkB = 0; -#endif - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanin( pObj, pNext, j ) - { - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < pNext->Level ) - pObj->Level = pNext->Level; - } - pObj->Level += Abc_ObjIsNode(pObj) ? 1 : 0; - - if (pObj->Level > pManMR->maxDelay) { - FSET(pObj, BLOCK); - } - } - - // 2. conservative constraints - - // first pass: seed latches with T=0 - Abc_NtkForEachLatch(pNtk, pObj, i) { - pObj->Level = 0; - } - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanin( pObj, pNext, j ) { - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < pNext->Level ) - pObj->Level = pNext->Level; - } - pObj->Level += Abc_ObjIsNode(pObj) ? 1 : 0; - - if ( Abc_ObjIsBi(pObj) ) - pObj->fMarkA = 1; - - assert(pObj->Level <= pManMR->maxDelay); - } - - Abc_NtkForEachLatch(pNtk, pObj, i) { - pBo = Abc_ObjFanout0( pObj ); - pBi = Abc_ObjFanin0( pObj ); - - if (pBi->fMarkA) { - pBi->fMarkA = 0; - pObj->Level = pBi->Level; - assert(pObj->Level <= pManMR->maxDelay); - } else - pObj->Level = 0; - } - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanin( pObj, pNext, j ) { - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < pNext->Level ) - pObj->Level = pNext->Level; - } - pObj->Level += Abc_ObjIsNode(pObj) ? 1 : 0; - - // constrained? - if (pObj->Level > pManMR->maxDelay) { - FSET( pObj, CONSERVATIVE ); - pManMR->nConservConstraints++; - } else - FUNSET( pObj, CONSERVATIVE ); - } - - Vec_PtrClear( vNodes ); -} - - -void Abc_FlowRetime_ConstrainConserv_back( Abc_Ntk_t * pNtk ) { - Vec_Ptr_t *vNodes = pManMR->vNodes; - Abc_Obj_t *pObj, *pNext, *pBi, *pBo; - int i, j, l; - - assert(!Vec_PtrSize(vNodes)); - - pManMR->nConservConstraints = 0; - - // 1. hard constraints - - // (i) collect TFO of POs - Abc_NtkIncrementTravId(pNtk); - Abc_NtkForEachPo(pNtk, pObj, i) - Abc_FlowRetime_Dfs_back( pObj, vNodes ); - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanout( pObj, pNext, j ) - { - l = pNext->Level + (Abc_ObjIsNode(pObj) ? 1 : 0); - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < l ) - pObj->Level = l; - } - - if ( Abc_ObjIsBo(pObj) ) - pObj->fMarkA = 1; - - assert(pObj->Level <= pManMR->maxDelay); - } - - // collect TFO of latches - // seed arrival times from BIs - Vec_PtrClear(vNodes); - Abc_NtkIncrementTravId(pNtk); - Abc_NtkForEachLatch(pNtk, pObj, i) { - pBo = Abc_ObjFanout0( pObj ); - pBi = Abc_ObjFanin0( pObj ); - - Abc_NodeSetTravIdCurrent( pObj ); - Abc_FlowRetime_Dfs_back( pBi, vNodes ); - - if (pBo->fMarkA) { - pBo->fMarkA = 0; - pObj->Level = pBo->Level; - assert(pObj->Level <= pManMR->maxDelay); - } else - pObj->Level = 0; - } - -#if defined(DEBUG_CHECK) - // DEBUG: check DFS ordering - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->fMarkB = 1; - - Abc_ObjForEachFanout( pObj, pNext, j ) - if ( Abc_NodeIsTravIdCurrent(pNext) && !Abc_ObjIsLatch(pNext)) - assert(pNext->fMarkB); - } - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) - pObj->fMarkB = 0; -#endif - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanout( pObj, pNext, j ) - { - l = pNext->Level + (Abc_ObjIsNode(pObj) ? 1 : 0); - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < l ) - pObj->Level = l; - } - - if (pObj->Level + (Abc_ObjIsNode(pObj)?1:0) > pManMR->maxDelay) { - FSET(pObj, BLOCK); - } - } - - // 2. conservative constraints - - // first pass: seed latches with T=0 - Abc_NtkForEachLatch(pNtk, pObj, i) { - pObj->Level = 0; - } - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanout( pObj, pNext, j ) { - l = pNext->Level + (Abc_ObjIsNode(pObj) ? 1 : 0); - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < l ) - pObj->Level = l; - } - - if ( Abc_ObjIsBo(pObj) ) { - pObj->fMarkA = 1; - } - - assert(pObj->Level <= pManMR->maxDelay); - } - - Abc_NtkForEachLatch(pNtk, pObj, i) { - pBo = Abc_ObjFanout0( pObj ); - assert(Abc_ObjIsBo(pBo)); - pBi = Abc_ObjFanin0( pObj ); - assert(Abc_ObjIsBi(pBi)); - - if (pBo->fMarkA) { - pBo->fMarkA = 0; - pObj->Level = pBo->Level; - } else - pObj->Level = 0; - } - - // ... propagate values - Vec_PtrForEachEntryReverse( Abc_Obj_t *,vNodes, pObj, i) { - pObj->Level = 0; - Abc_ObjForEachFanout( pObj, pNext, j ) { - l = pNext->Level + (Abc_ObjIsNode(pObj) ? 1 : 0); - if ( Abc_NodeIsTravIdCurrent(pNext) && - pObj->Level < l ) - pObj->Level = l; - } - - // constrained? - if (pObj->Level > pManMR->maxDelay) { - FSET( pObj, CONSERVATIVE ); - pManMR->nConservConstraints++; - } else - FUNSET( pObj, CONSERVATIVE ); - } - - Vec_PtrClear( vNodes ); -} - - -/**Function************************************************************* - - Synopsis [Introduces exact timing constraints for a node.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_FlowRetime_ConstrainExact( Abc_Obj_t * pObj ) { - - if (FTEST( pObj, CONSERVATIVE )) { - pManMR->nConservConstraints--; - FUNSET( pObj, CONSERVATIVE ); - } - -#if !defined(IGNORE_TIMING) - if (pManMR->fIsForward) { - Abc_FlowRetime_ConstrainExact_forw(pObj); - } else { - Abc_FlowRetime_ConstrainExact_back(pObj); - } -#endif -} - -void Abc_FlowRetime_ConstrainExact_forw_rec( Abc_Obj_t * pObj, Vec_Ptr_t *vNodes, int latch ) { - Abc_Obj_t *pNext; - int i; - - // terminate? - if (Abc_ObjIsLatch(pObj)) { - if (latch) return; - latch = 1; - } - - // already visited? - if (!latch) { - if (pObj->fMarkA) return; - pObj->fMarkA = 1; - } else { - if (pObj->fMarkB) return; - pObj->fMarkB = 1; - } - - // recurse - Abc_ObjForEachFanin(pObj, pNext, i) { - Abc_FlowRetime_ConstrainExact_forw_rec( pNext, vNodes, latch ); - } - - // add - pObj->Level = 0; - Vec_PtrPush(vNodes, Abc_ObjNotCond(pObj, latch)); -} - -void Abc_FlowRetime_ConstrainExact_forw( Abc_Obj_t * pObj ) { - Vec_Ptr_t *vNodes = pManMR->vNodes; - Abc_Obj_t *pNext, *pCur, *pReg; - // Abc_Ntk_t *pNtk = pManMR->pNtk; - int i, j; - - assert( !Vec_PtrSize(vNodes) ); - assert( !Abc_ObjIsLatch(pObj) ); - assert( !Vec_PtrSize( FTIMEEDGES(pObj) )); - Vec_PtrPush( pManMR->vExactNodes, pObj ); - - // rev topo order - Abc_FlowRetime_ConstrainExact_forw_rec( pObj, vNodes, 0 ); - - Vec_PtrForEachEntryReverse( Abc_Obj_t *, vNodes, pCur, i) { - pReg = Abc_ObjRegular( pCur ); - - if (pReg == pCur) { - assert(!Abc_ObjIsLatch(pReg)); - Abc_ObjForEachFanin(pReg, pNext, j) - pNext->Level = MAX( pNext->Level, pReg->Level + (Abc_ObjIsNode(pReg)?1:0)); - assert(pReg->Level <= pManMR->maxDelay); - pReg->Level = 0; - pReg->fMarkA = pReg->fMarkB = 0; - } - } - Vec_PtrForEachEntryReverse( Abc_Obj_t *, vNodes, pCur, i) { - pReg = Abc_ObjRegular( pCur ); - if (pReg != pCur) { - Abc_ObjForEachFanin(pReg, pNext, j) - if (!Abc_ObjIsLatch(pNext)) - pNext->Level = MAX( pNext->Level, pReg->Level + (Abc_ObjIsNode(pReg)?1:0)); - - if (pReg->Level == pManMR->maxDelay) { - Vec_PtrPush( FTIMEEDGES(pObj), pReg); - pManMR->nExactConstraints++; - } - pReg->Level = 0; - pReg->fMarkA = pReg->fMarkB = 0; - } - } - - Vec_PtrClear( vNodes ); -} - -void Abc_FlowRetime_ConstrainExact_back_rec( Abc_Obj_t * pObj, Vec_Ptr_t *vNodes, int latch ) { - Abc_Obj_t *pNext; - int i; - - // terminate? - if (Abc_ObjIsLatch(pObj)) { - if (latch) return; - latch = 1; - } - - // already visited? - if (!latch) { - if (pObj->fMarkA) return; - pObj->fMarkA = 1; - } else { - if (pObj->fMarkB) return; - pObj->fMarkB = 1; - } - - // recurse - Abc_ObjForEachFanout(pObj, pNext, i) { - Abc_FlowRetime_ConstrainExact_back_rec( pNext, vNodes, latch ); - } - - // add - pObj->Level = 0; - Vec_PtrPush(vNodes, Abc_ObjNotCond(pObj, latch)); -} - - -void Abc_FlowRetime_ConstrainExact_back( Abc_Obj_t * pObj ) { - Vec_Ptr_t *vNodes = pManMR->vNodes; - Abc_Obj_t *pNext, *pCur, *pReg; - // Abc_Ntk_t *pNtk = pManMR->pNtk; - int i, j; - - assert( !Vec_PtrSize( vNodes )); - assert( !Abc_ObjIsLatch(pObj) ); - assert( !Vec_PtrSize( FTIMEEDGES(pObj) )); - Vec_PtrPush( pManMR->vExactNodes, pObj ); - - // rev topo order - Abc_FlowRetime_ConstrainExact_back_rec( pObj, vNodes, 0 ); - - Vec_PtrForEachEntryReverse( Abc_Obj_t *, vNodes, pCur, i) { - pReg = Abc_ObjRegular( pCur ); - - if (pReg == pCur) { - assert(!Abc_ObjIsLatch(pReg)); - Abc_ObjForEachFanout(pReg, pNext, j) - pNext->Level = MAX( pNext->Level, pReg->Level + (Abc_ObjIsNode(pReg)?1:0)); - assert(pReg->Level <= pManMR->maxDelay); - pReg->Level = 0; - pReg->fMarkA = pReg->fMarkB = 0; - } - } - Vec_PtrForEachEntryReverse( Abc_Obj_t *, vNodes, pCur, i) { - pReg = Abc_ObjRegular( pCur ); - if (pReg != pCur) { - Abc_ObjForEachFanout(pReg, pNext, j) - if (!Abc_ObjIsLatch(pNext)) - pNext->Level = MAX( pNext->Level, pReg->Level + (Abc_ObjIsNode(pReg)?1:0)); - - if (pReg->Level == pManMR->maxDelay) { - Vec_PtrPush( FTIMEEDGES(pObj), pReg); - pManMR->nExactConstraints++; - } - pReg->Level = 0; - pReg->fMarkA = pReg->fMarkB = 0; - } - } - - Vec_PtrClear( vNodes ); -} - - -/**Function************************************************************* - - Synopsis [Introduces all exact timing constraints in a network] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_FlowRetime_ConstrainExactAll( Abc_Ntk_t * pNtk ) { - int i; - Abc_Obj_t *pObj; - void *pArray; - - // free existing constraints - Abc_NtkForEachObj( pNtk, pObj, i ) - if ( Vec_PtrSize( FTIMEEDGES(pObj) )) { - pArray = Vec_PtrReleaseArray( FTIMEEDGES(pObj) ); - FREE( pArray ); - } - pManMR->nExactConstraints = 0; - - // generate all constraints - Abc_NtkForEachObj(pNtk, pObj, i) - if (!Abc_ObjIsLatch(pObj) && FTEST( pObj, CONSERVATIVE ) && !FTEST( pObj, BLOCK )) - if (!Vec_PtrSize( FTIMEEDGES( pObj ) )) - Abc_FlowRetime_ConstrainExact( pObj ); -} - - - -/**Function************************************************************* - - Synopsis [Deallocates exact constraints.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_FlowRetime_FreeTiming( Abc_Ntk_t *pNtk ) { - Abc_Obj_t *pObj; - void *pArray; - - while( Vec_PtrSize( pManMR->vExactNodes )) { - pObj = Vec_PtrPop( pManMR->vExactNodes ); - - if ( Vec_PtrSize( FTIMEEDGES(pObj) )) { - pArray = Vec_PtrReleaseArray( FTIMEEDGES(pObj) ); - FREE( pArray ); - } - } - - Vec_PtrFree(pManMR->vExactNodes); - FREE( pManMR->vTimeEdges ); -} - - -/**Function************************************************************* - - Synopsis [DFS order.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_FlowRetime_Dfs_forw( Abc_Obj_t * pObj, Vec_Ptr_t *vNodes ) { - Abc_Obj_t *pNext; - int i; - - if (Abc_ObjIsLatch(pObj)) return; - - Abc_NodeSetTravIdCurrent( pObj ); - - Abc_ObjForEachFanout( pObj, pNext, i ) - if (!Abc_NodeIsTravIdCurrent( pNext )) - Abc_FlowRetime_Dfs_forw( pNext, vNodes ); - - Vec_PtrPush( vNodes, pObj ); -} - - -void Abc_FlowRetime_Dfs_back( Abc_Obj_t * pObj, Vec_Ptr_t *vNodes ) { - Abc_Obj_t *pNext; - int i; - - if (Abc_ObjIsLatch(pObj)) return; - - Abc_NodeSetTravIdCurrent( pObj ); - - Abc_ObjForEachFanin( pObj, pNext, i ) - if (!Abc_NodeIsTravIdCurrent( pNext )) - Abc_FlowRetime_Dfs_back( pNext, vNodes ); - - Vec_PtrPush( vNodes, pObj ); -} - - -/**Function************************************************************* - - Synopsis [Main timing-constrained routine.] - - Description [Refines constraints that are limiting area improvement. - These are identified by computing - the min-cuts both with and without the conservative - constraints: these two situation represent an - over- and under-constrained version of the timing.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Abc_FlowRetime_RefineConstraints( ) { - Abc_Ntk_t *pNtk = pManMR->pNtk; - int i, flow, count = 0; - Abc_Obj_t *pObj; - int maxTighten = 99999; - - vprintf("\t\tsubiter %d : constraints = {cons, exact} = %d, %d\n", - pManMR->subIteration, pManMR->nConservConstraints, pManMR->nExactConstraints); - - // 1. overconstrained - pManMR->constraintMask = BLOCK | CONSERVATIVE; - vprintf("\t\trefinement: over "); - fflush(stdout); - flow = Abc_FlowRetime_PushFlows( pNtk, 0 ); - vprintf("= %d ", flow); - - // remember nodes - if (pManMR->fIsForward) { - Abc_NtkForEachObj( pNtk, pObj, i ) - if (!FTEST(pObj, VISITED_R)) - pObj->fMarkC = 1; - } else { - Abc_NtkForEachObj( pNtk, pObj, i ) - if (!FTEST(pObj, VISITED_E)) - pObj->fMarkC = 1; - } - - if (pManMR->fConservTimingOnly) { - vprintf(" done\n"); - return 0; - } - - // 2. underconstrained - pManMR->constraintMask = BLOCK; - Abc_FlowRetime_ClearFlows( 0 ); - vprintf("under = "); - fflush(stdout); - flow = Abc_FlowRetime_PushFlows( pNtk, 0 ); - vprintf("%d refined nodes = ", flow); - fflush(stdout); - - // find area-limiting constraints - if (pManMR->fIsForward) { - Abc_NtkForEachObj( pNtk, pObj, i ) { - if (pObj->fMarkC && - FTEST(pObj, VISITED_R) && - FTEST(pObj, CONSERVATIVE) && - count < maxTighten) { - count++; - Abc_FlowRetime_ConstrainExact( pObj ); - } - pObj->fMarkC = 0; - } - } else { - Abc_NtkForEachObj( pNtk, pObj, i ) { - if (pObj->fMarkC && - FTEST(pObj, VISITED_E) && - FTEST(pObj, CONSERVATIVE) && - count < maxTighten) { - count++; - Abc_FlowRetime_ConstrainExact( pObj ); - } - pObj->fMarkC = 0; - } - } - - vprintf("%d\n", count); - - return (count > 0); -} - - -ABC_NAMESPACE_IMPL_END - |