source: vis_dev/vis-2.3/src/synth/synthSynth.c @ 56

Last change on this file since 56 was 14, checked in by cecile, 13 years ago

vis2.3
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1/**CFile***********************************************************************
2
3  FileName    [synthSynth.c]
4
5  PackageName [synth]
6
7  Synopsis    [Synthesis Algorithms]
8
9  Description [This file contains main routines that implement symbolic
10  factorization algorithms.]
11
12  SeeAlso     [synthDiv.c synthFactor.c synthGen.c synthOpt.c synthSimple.c]
13
14  Author      [Balakrishna Kumthekar, In-Ho Moon]
15
16  Copyright   [This file was created at the University of Colorado at
17  Boulder.  The University of Colorado at Boulder makes no warranty
18  about the suitability of this software for any purpose.  It is
19  presented on an AS IS basis.]
20
21******************************************************************************/
22
23#include "synthInt.h"
24
25static char rcsid[] UNUSED = "$Id: synthSynth.c,v 1.47 2005/04/23 14:37:51 jinh Exp $";
26
27
28/*---------------------------------------------------------------------------*/
29/* Constant declarations                                                     */
30/*---------------------------------------------------------------------------*/
31
32
33/*---------------------------------------------------------------------------*/
34/* Type declarations                                                         */
35/*---------------------------------------------------------------------------*/
36
37
38/*---------------------------------------------------------------------------*/
39/* Structure declarations                                                    */
40/*---------------------------------------------------------------------------*/
41
42
43/*---------------------------------------------------------------------------*/
44/* Variable declarations                                                     */
45/*---------------------------------------------------------------------------*/
46
47
48/*---------------------------------------------------------------------------*/
49/* Macro declarations                                                        */
50/*---------------------------------------------------------------------------*/
51
52
53/**AutomaticStart*************************************************************/
54
55/*---------------------------------------------------------------------------*/
56/* Static function prototypes                                                */
57/*---------------------------------------------------------------------------*/
58
59static int synthesizeNetwork(Ntk_Network_t *network, graph_t *partition, Fsm_Fsm_t *fsm, st_table *careBddTable, Synth_InfoData_t *synthInfo, int verbosity);
60static int IsPartitionValid(Ntk_Network_t *network, graph_t *partition);
61static array_t * GetCombOutputNameArray(Ntk_Network_t *network);
62static array_t * GetCombInputIdArray(Ntk_Network_t *network);
63static bdd_node ** GetBddArray(Mvf_Function_t *combMvfs);
64
65/**AutomaticEnd***************************************************************/
66
67
68/*---------------------------------------------------------------------------*/
69/* Definition of exported functions                                          */
70/*---------------------------------------------------------------------------*/
71
72/**Function********************************************************************
73
74  Synopsis    [Initialize the info data structure.]
75
76  Description [Initialize the info data structure. See the documentation for
77  CommandSynthesizeNetwork for the meaning of the various fields.]
78
79  SideEffects [None]
80
81  SeeAlso [Synth_FreeInfo]
82
83******************************************************************************/
84Synth_InfoData_t *
85Synth_InitializeInfo(int factoring,
86                     int divisor,
87                     int unreachDC,
88                     int reordering,
89                     int trySharing,
90                     int realign,
91                     char *filehead,
92                     char *prefix,
93                     boolean eqn)
94{
95
96  Synth_InfoData_t *synthInfo;
97
98  synthInfo = ALLOC(Synth_InfoData_t, 1);
99  if (!synthInfo) {
100    (void) fprintf(vis_stderr,
101                   "** synth error: Could not initialize info structure.\n");
102    return NIL(Synth_InfoData_t);
103  }
104  synthInfo->factoring = factoring;
105  synthInfo->divisor = divisor;
106  synthInfo->unreachDC = unreachDC;
107  synthInfo->reordering = reordering;
108  synthInfo->trySharing = trySharing;
109  synthInfo->realign = realign;
110  synthInfo->filehead = filehead;
111  synthInfo->prefix = prefix;
112  synthInfo->eqn = eqn;
113  return synthInfo;
114}
115
116/**Function********************************************************************
117
118  Synopsis    [Free info data.]
119
120  Description [Free Info data.]
121
122  SideEffects [None]
123
124  SeeAlso [Synth_InitializeInfo]
125
126******************************************************************************/
127void
128Synth_FreeInfo(Synth_InfoData_t *synthInfo)
129{
130  FREE(synthInfo);
131}
132
133/**Function********************************************************************
134
135  Synopsis    [Synthesize a network.]
136
137  Description [Synthesize a network. Here a major assumption is that, if the
138  network is sequential, and an FSM is already hooked to the network, then the
139  partition field of the FSM and that of the network are isomorphic.]
140
141  SideEffects [If an FSM (in case of a sequential design) or the circuit
142  partition does not already exist in the network, they are created and hooked
143  to the network. However, they are freed at the end of this procedure. ]
144
145  SeeAlso [Synth_SynthesizeFsm]
146
147******************************************************************************/
148int
149Synth_SynthesizeNetwork(Ntk_Network_t *network,
150                        graph_t *partition,
151                        st_table *careTable,
152                        Synth_InfoData_t *synthInfo,
153                        int verbosity)
154{
155  graph_t *newPartition = NIL(graph_t);
156  Fsm_Fsm_t *fsm = NIL(Fsm_Fsm_t);
157  st_table *careBddTable;
158  int status;
159  int createdPart = 0;
160  int createdFsm = 0;
161  int ntkIsSeq = 1;
162
163  if (bdd_get_package_name() != CUDD) {
164    (void) fprintf(vis_stderr,
165  "** synth error: The synthesis package can be used only with CUDD package\n");
166    (void) fprintf(vis_stderr,
167                   "** synth error: Please link with the CUDD package\n");
168    return 0;
169  }
170  if (partition == NIL(graph_t)) {
171    newPartition = (graph_t *) Ntk_NetworkReadApplInfo(network, 
172                                                       PART_NETWORK_APPL_KEY);
173    createdPart = 0; /* Using partition of the network. */
174    if (newPartition == NIL(graph_t) || 
175        (!IsPartitionValid(network,newPartition))) {
176      newPartition = Part_NetworkCreatePartition(network, 
177                                                 NIL(Hrc_Node_t),
178                                                 "dummy", (lsList) 0, 
179                                                 (lsList) 0, NIL(mdd_t),
180                                                 Part_InOut_c,
181                                                 (lsList) 0, 
182                                                 FALSE, FALSE, TRUE);
183      if (newPartition == NIL(graph_t)) {
184        (void) fprintf(vis_stderr,"** synth error: Could not create an InOut");
185        (void) fprintf(vis_stderr,"partition.\n");
186        return 0;
187      }
188      createdPart = 1; /* Using new partition */
189    }
190  } else {
191    if (IsPartitionValid(network,partition)) {
192      newPartition = partition;
193      createdPart = 2; /* Using the partition provided. */
194    } else {
195      newPartition = Part_NetworkCreatePartition(network, 
196                                                 NIL(Hrc_Node_t),
197                                                 "dummy", (lsList) 0, 
198                                                 (lsList) 0, NIL(mdd_t),
199                                                 Part_InOut_c,
200                                                 (lsList) 0, 
201                                                 FALSE, FALSE, TRUE);
202      if (newPartition == NIL(graph_t)) {
203        (void) fprintf(vis_stderr,"** synth error: Could not create an InOut");
204        (void) fprintf(vis_stderr,"partition.\n");
205        return 0;
206      }
207      createdPart = 1;   
208    }
209  }
210
211
212  if(!Ntk_NetworkReadNumLatches(network)) {
213    (void) fprintf(vis_stdout, "** synth info: No latches present in the ");
214    (void) fprintf(vis_stdout, "current network.\n");
215    (void) fprintf(vis_stdout,
216                   "** synth info: Proceeding with combinational synthesis.\n");
217    ntkIsSeq = 0;
218  }
219
220  if (ntkIsSeq) {
221    switch (createdPart) {
222    case 0:
223      /* Check if there is already an Fsm attached to
224       * the network.
225       */
226      fsm = (Fsm_Fsm_t *) Ntk_NetworkReadApplInfo(network, 
227                                                  FSM_NETWORK_APPL_KEY);
228      if (fsm == NIL(Fsm_Fsm_t)) {
229        fsm = Fsm_FsmCreateFromNetworkWithPartition(network, 
230                                                    NIL(graph_t));
231        if (fsm == NIL(Fsm_Fsm_t)) {
232          (void) fprintf(vis_stderr,"** synth error: Could not create ");
233          (void) fprintf(vis_stderr,"an Fsm\n");
234          goto endgame;
235        }
236        createdFsm = 1;
237      } else {
238        createdFsm = 0;
239      }
240      break;
241    case 1:
242    case 2:
243      fsm = Fsm_FsmCreateFromNetworkWithPartition(network,
244                                  Part_PartitionDuplicate(newPartition));
245
246      if (fsm == NIL(Fsm_Fsm_t)) {
247        (void) fprintf(vis_stderr,"** synth error: Could not create ");
248        (void) fprintf(vis_stderr,"an Fsm\n");
249        goto endgame;
250      }
251      createdFsm = 1;
252      break;
253    }
254  }
255
256  careBddTable = NIL(st_table);
257  if (careTable != NIL(st_table)) {
258    mdd_t *mddTemp;
259    bdd_node *ddNode;
260    char *name;
261    st_generator *stGen;
262
263    careBddTable = st_init_table(strcmp, st_strhash);
264    st_foreach_item(careTable,stGen,&name,&mddTemp) {
265      ddNode = bdd_extract_node_as_is(mddTemp);
266      st_insert(careBddTable,name,(char *)ddNode);
267    }
268  }
269  if (fsm)
270    status = synthesizeNetwork(network, newPartition,
271                               fsm, careBddTable, synthInfo,
272                               verbosity);
273  else
274    status = synthesizeNetwork(network,newPartition,
275                               NIL(Fsm_Fsm_t), careBddTable,
276                               synthInfo, verbosity);
277
278  if (careBddTable)
279    st_free_table(careBddTable);
280  if (createdPart == 1)
281    Part_PartitionFree(newPartition);
282  if (createdFsm == 1)
283    Fsm_FsmFree(fsm);
284
285  return status;
286
287 endgame:
288  if (createdPart == 1)
289    Part_PartitionFree(newPartition);
290  if (createdFsm == 1)
291    Fsm_FsmFree(fsm);
292
293  return 0;
294
295}
296
297/**Function********************************************************************
298
299  Synopsis    [Synthesize an FSM.]
300
301  Description [Synthesize an FSM. This procedure can be used if the default FSM
302  attached to the network is different from the one that needs to be
303  synthesized.]
304
305  SideEffects [None]
306
307  SeeAlso [Synth_SynthesizeNetwork]
308
309******************************************************************************/
310int
311Synth_SynthesizeFsm(Fsm_Fsm_t *fsm,
312                    st_table *careTable,
313                    Synth_InfoData_t *synthInfo,
314                    int verbosity)
315{
316  Ntk_Network_t *network;
317  graph_t *partition;
318  st_table *careBddTable;
319  int status;
320
321  network = Fsm_FsmReadNetwork(fsm);
322  partition = Fsm_FsmReadPartition(fsm);
323
324  careBddTable = NIL(st_table);
325  if (careTable != NIL(st_table)) {
326    mdd_t *mddTemp;
327    bdd_node *ddNode;
328    char *name;
329    st_generator *stGen;
330
331    careBddTable = st_init_table(strcmp, st_strhash);
332    st_foreach_item(careTable,stGen,&name,&mddTemp) {
333      ddNode = bdd_extract_node_as_is(mddTemp);
334      st_insert(careBddTable,name,(char *)ddNode);
335    }
336  }
337   
338  status = synthesizeNetwork(network,partition,fsm,careBddTable,synthInfo,
339                             verbosity);
340  if (careBddTable)
341    st_free_table(careBddTable);
342
343  return status;
344}
345
346/*---------------------------------------------------------------------------*/
347/* Definition of internal functions                                          */
348/*---------------------------------------------------------------------------*/
349
350
351/*---------------------------------------------------------------------------*/
352/* Definition of static functions                                            */
353/*---------------------------------------------------------------------------*/
354
355/**Function********************************************************************
356
357  Synopsis    [Core function of Synth_SynthesizeNetwork.]
358
359  Description [Core function of Synth_SynthesizeNetwork and
360  Synth_SynthesizeFsm.]
361
362  SideEffects [None]
363
364  SeeAlso []
365
366******************************************************************************/
367static int
368synthesizeNetwork(Ntk_Network_t *network,
369                  graph_t *partition,
370                  Fsm_Fsm_t *fsm,
371                  st_table *careBddTable,
372                  Synth_InfoData_t *synthInfo,
373                  int verbosity)
374{
375  bdd_manager *ddManager = (bdd_manager *) Ntk_NetworkReadMddManager(network);
376  int i, numOut;
377  int *initStates = NIL(int);
378  Mvf_Function_t *combMvfs;
379  array_t *inputIds, *combOutNamesArray;
380  bdd_node **combOutBdds, *ddTemp;
381  bdd_node *unReachable = NIL(bdd_node), *reachable = NIL(bdd_node);
382  bdd_node **combUpperBdds;
383  bdd_node *initBdd = NIL(bdd_node), *temp;
384  char **combOutNames;
385  char *str;
386  int realign_bdd, realign_zdd;
387  Fsm_RchType_t reachMethod;
388
389  /* Save current values of realignment flags. */
390  realign_zdd = bdd_zdd_realignment_enabled(ddManager);
391  realign_bdd = bdd_realignment_enabled(ddManager);
392
393  if (synthInfo->reordering == 1) {
394    if (synthInfo->realign)
395      bdd_zdd_realign_enable(ddManager);
396    else
397      bdd_zdd_realign_disable(ddManager);
398    bdd_realign_disable(ddManager);
399  } else if (synthInfo->reordering == 2) {
400    bdd_zdd_realign_disable(ddManager);
401    if (synthInfo->realign)
402      bdd_realign_enable(ddManager);
403    else
404      bdd_realign_disable(ddManager);
405  } else {
406    bdd_zdd_realign_disable(ddManager);
407    bdd_realign_disable(ddManager);
408  }
409
410  /* Get the names of the combinational outputs, i.e, next state functions
411   * as well as primary outputs. In VIS even latch initial inputs are
412   * considered combinational outputs. Since, we support only blif files,
413   * latch initial inputs are not present in combOutNamesArray.
414   */
415  combOutNamesArray = GetCombOutputNameArray(network);
416  if (combOutNamesArray == NIL(array_t)) {
417    if (realign_zdd == 1)
418      bdd_zdd_realign_enable(ddManager);
419    else
420      bdd_zdd_realign_disable(ddManager);
421    if (realign_bdd == 1)
422      bdd_realign_enable(ddManager);
423    else
424      bdd_realign_disable(ddManager);
425    return 0;
426  }
427  /* Get the array of combinational inputs, i.e., primary inputs,
428   * present state variables.
429   */
430  inputIds = GetCombInputIdArray(network);
431  if (inputIds == NIL(array_t)) {
432    array_free(combOutNamesArray);
433    /* Restore values of realignment flags. */
434    if (realign_zdd == 1)
435      bdd_zdd_realign_enable(ddManager);
436    else
437      bdd_zdd_realign_disable(ddManager);
438    if (realign_bdd == 1)
439      bdd_realign_enable(ddManager);
440    else
441      bdd_realign_disable(ddManager);
442    return 0;
443  }
444  /* Compute the Bdds */
445  combMvfs = Part_PartitionBuildFunctions(partition,combOutNamesArray,
446                                          inputIds,NIL(mdd_t));
447  combOutBdds = (bdd_node **) GetBddArray(combMvfs);
448  if (combOutBdds == NIL(bdd_node *)) {
449    array_free(combOutNamesArray);
450    array_free(inputIds);
451    Mvf_FunctionArrayFree(combMvfs);
452    if (realign_zdd == 1)
453      bdd_zdd_realign_enable(ddManager);
454    else
455      bdd_zdd_realign_disable(ddManager);
456    if (realign_bdd == 1)
457      bdd_realign_enable(ddManager);
458    else
459      bdd_realign_disable(ddManager);
460    return 0;
461  }
462  Mvf_FunctionArrayFree(combMvfs);
463
464  numOut = array_n(combOutNamesArray); 
465  combOutNames = ALLOC(char *, numOut);
466  if (combOutNames == NIL(char *)) {
467    (void) fprintf(vis_stderr,"** synth error: Could not allocate memory\n");
468    array_free(combOutNamesArray);
469    array_free(inputIds);
470
471    for (i = 0; i < numOut; i++) {
472      bdd_recursive_deref(ddManager,combOutBdds[i]);
473    }
474    FREE(combOutBdds);
475    if (realign_zdd == 1)
476      bdd_zdd_realign_enable(ddManager);
477    else
478      bdd_zdd_realign_disable(ddManager);
479    if (realign_bdd == 1)
480      bdd_realign_enable(ddManager);
481    else
482      bdd_realign_disable(ddManager);
483    return 0;
484  }
485  arrayForEachItem(char *, combOutNamesArray, i, str) {
486    combOutNames[i] = str;
487  }
488  array_free(combOutNamesArray);
489
490
491  combUpperBdds = ALLOC(bdd_node *,numOut);
492  /* Initialize the upper bound to be the lower bound */
493  for (i = 0; i < numOut; i++) {
494    bdd_ref(combUpperBdds[i] = combOutBdds[i]);
495  }
496
497  if (fsm) {
498    mdd_t *initMdd;
499    /* Duplicate copy of initial States is returned */
500    initMdd = Fsm_FsmComputeInitialStates(fsm);
501    initBdd = (bdd_node *)bdd_extract_node_as_is(initMdd);
502    bdd_ref(initBdd);
503    mdd_free(initMdd);
504
505    if (synthInfo->unreachDC) {
506      mdd_t *reachStates;
507
508      (void) fprintf(vis_stdout,
509                     "** synth info: Using unreachable states as dont cares\n");
510      if (synthInfo->unreachDC == 1) {
511        reachMethod = Fsm_Rch_Bfs_c;
512      } else if (synthInfo->unreachDC == 2) {
513        reachMethod = Fsm_Rch_Hd_c;
514      } else if (synthInfo->unreachDC == 3) {
515        reachMethod = Fsm_Rch_Oa_c;
516      } else {
517        reachMethod = Fsm_Rch_Default_c;
518      }
519      reachStates = Fsm_FsmComputeReachableStates(fsm,0,0,0,0,
520                                                  0,0,1000,reachMethod,
521                                                  0,0,NIL(array_t), FALSE,
522                                                  NIL(array_t));
523      reachable = (bdd_node *)bdd_extract_node_as_is(reachStates);
524      bdd_ref(reachable);
525      unReachable = bdd_not_bdd_node(reachable);
526      bdd_ref(unReachable);
527      mdd_free(reachStates);
528    }
529  }
530
531  if (careBddTable == NIL(st_table)) {
532    if (fsm && synthInfo->unreachDC) {
533      /* Upper bound = LowerBould + DC */
534      for (i = 0; i < numOut; i++) {
535        bdd_recursive_deref(ddManager,combUpperBdds[i]);
536        combUpperBdds[i] = bdd_bdd_or(ddManager,combOutBdds[i],
537                                      unReachable);
538        bdd_ref(combUpperBdds[i]);
539      }
540     
541      /* LowerBound = OutputFuns . Care */
542      bdd_recursive_deref(ddManager,unReachable);
543      for (i = 0; i < numOut; i++) {
544        bdd_node *temp;
545        temp = bdd_bdd_and(ddManager,combOutBdds[i],reachable);
546        bdd_ref(temp);
547        bdd_recursive_deref(ddManager,combOutBdds[i]);
548        combOutBdds[i] = temp;
549      }
550      bdd_recursive_deref(ddManager,reachable);
551    }
552  } else { /* Use the cares supplied. */
553    if (fsm && synthInfo->unreachDC) {
554      bdd_recursive_deref(ddManager,unReachable);
555    }
556    for (i = 0; i < numOut; i++) {
557      bdd_node *dontCare,*care;
558
559      if (st_lookup(careBddTable,combOutNames[i],&ddTemp) == 1) {
560        if (fsm && synthInfo->unreachDC) {
561          bdd_ref(care = bdd_bdd_or(ddManager,ddTemp,reachable));
562        } else {
563          bdd_ref(care = ddTemp);
564        }
565        bdd_ref(dontCare = bdd_not_bdd_node(care));
566       
567        /* Update the upper bound for each combinational output */
568        bdd_recursive_deref(ddManager,combUpperBdds[i]);
569        combUpperBdds[i] = bdd_bdd_or(ddManager,combOutBdds[i],dontCare);
570        bdd_ref(combUpperBdds[i]);
571        bdd_recursive_deref(ddManager,dontCare);
572       
573        /* Update the lower bound */
574        bdd_ref(temp = bdd_bdd_and(ddManager,combOutBdds[i],care));
575        bdd_recursive_deref(ddManager,combOutBdds[i]);
576        bdd_recursive_deref(ddManager,care);
577        combOutBdds[i]=temp;
578      }
579    }
580  }
581
582  if (fsm) {
583    bdd_t *bddVar, *bddTInit, *bddTtemp;
584    int id, i = 0;
585    lsGen gen;
586    Ntk_Node_t *node;
587    bdd_node *logicZero = bdd_read_logic_zero(ddManager);
588
589    bddTInit = bdd_construct_bdd_t(ddManager,initBdd);
590    initStates = ALLOC(int, Ntk_NetworkReadNumLatches(network));
591    Ntk_NetworkForEachLatch(network,gen,node) {
592      id = Ntk_NodeReadMddId(node);
593      bddVar = bdd_get_variable(ddManager,id);
594      bddTtemp = bdd_cofactor(bddTInit, bddVar);
595      if (bdd_extract_node_as_is(bddTtemp) == logicZero) 
596        initStates[i] = 0;
597      else
598        initStates[i] = 1;
599      i++;
600      bdd_free(bddVar);
601      bdd_free(bddTtemp);
602    }
603    /* This will free initBdd too. So, no need to deref it again.  */
604    bdd_free(bddTInit);
605  }
606
607  SynthMultiLevelOptimize(network,combOutBdds,combUpperBdds,
608                          combOutNames, initStates,synthInfo,
609                          verbosity);
610
611  /* Clean up. */
612  if (fsm) {
613    FREE(initStates);
614  }
615  for (i = 0; i < numOut; i++) {
616    bdd_recursive_deref(ddManager,combUpperBdds[i]);
617    bdd_recursive_deref(ddManager,combOutBdds[i]);
618  }
619  FREE(combOutNames);
620  FREE(combOutBdds);
621  FREE(combUpperBdds);
622  array_free(inputIds);
623  if (realign_zdd == 1)
624    bdd_zdd_realign_enable(ddManager);
625  else
626    bdd_zdd_realign_disable(ddManager);
627  if (realign_bdd == 1)
628    bdd_realign_enable(ddManager);
629  else
630    bdd_realign_disable(ddManager);
631  return(1);
632}
633
634/**Function********************************************************************
635
636  Synopsis    [Checks whether partition is valid.]
637
638  Description [Checks whether partition is valid. The condition is that the
639  given partition should have a vertex for each combinational output (PO and
640  NS) and combinational input (PI and PS) of the network. This is necessary to
641  completely synthesize the network.]
642
643  SideEffects [None]
644
645  SeeAlso []
646
647******************************************************************************/
648static int
649IsPartitionValid(Ntk_Network_t *network,
650                 graph_t *partition)
651{
652  Ntk_Node_t *node;
653  lsGen gen;
654  char *name;
655
656  Ntk_NetworkForEachCombOutput(network, gen, node) {
657    name = Ntk_NodeReadName(node);
658    if(Part_PartitionFindVertexByName(partition, name) == NIL(vertex_t)) {
659      return(0);
660    }
661  }
662  Ntk_NetworkForEachCombInput(network, gen, node) {
663    name = Ntk_NodeReadName(node);
664    if(Part_PartitionFindVertexByName(partition, name) == NIL(vertex_t)) {
665      return(0);
666    }
667  }
668
669  return 1;
670}
671
672
673/**Function********************************************************************
674
675  Synopsis    [Returns an array containing all combinational output names.]
676
677  Description [Returns an array containing all combinational output names.]
678
679  SideEffects [None]
680
681  SeeAlso []
682
683******************************************************************************/
684static array_t *
685GetCombOutputNameArray(Ntk_Network_t *network)
686{
687  array_t *outputFunNames;
688  lsGen gen;
689  Ntk_Node_t *node;
690   
691  outputFunNames = array_alloc(char *, 0);
692  if (outputFunNames == NIL(array_t)) {
693    (void) fprintf(vis_stderr,"** synth error: Could not allocate space ");
694    (void) fprintf(vis_stderr,"for the names of combinational outputs\n");
695    return NIL(array_t);
696  }
697  Ntk_NetworkForEachCombOutput(network, gen, node){
698    if (Ntk_NodeTestIsLatchInitialInput(node))
699      continue;
700    array_insert_last(char *, outputFunNames, 
701                      Ntk_NodeReadName(node));
702  }
703  return outputFunNames;
704}
705
706/**Function********************************************************************
707
708  Synopsis    [Returns an array containing mdd-ids of all combinational inputs.]
709
710  Description [Returns an array containing mdd-ids of all combinational inputs.]
711
712  SideEffects []
713
714  SeeAlso []
715
716******************************************************************************/
717static array_t *
718GetCombInputIdArray(Ntk_Network_t *network)
719{
720  array_t *inputIds;
721  lsGen gen;
722  Ntk_Node_t *node;
723   
724  inputIds = array_alloc(int, 0);
725  if (inputIds == NIL(array_t)) {
726    (void) fprintf(vis_stderr,"** synth error: Could not allocate space ");
727    (void) fprintf(vis_stderr,"for an array of ids of comb. inputs\n");
728    return NIL(array_t);
729  }
730  Ntk_NetworkForEachCombInput(network, gen, node){
731    array_insert_last(int, inputIds, Ntk_NodeReadMddId(node));
732  }
733  return inputIds;
734}
735
736
737/**Function********************************************************************
738
739  Synopsis    [Returns array of bdds of combinational outputs.]
740
741  Description [Returns array of bdds of combinational outputs.]
742
743  SideEffects [None]
744
745  SeeAlso []
746
747******************************************************************************/
748static bdd_node **
749GetBddArray(Mvf_Function_t *combMvfs)
750{
751  bdd_node **bddArray;
752  Mvf_Function_t *mvf;
753  int i;
754
755  bddArray = ALLOC(bdd_node *,array_n(combMvfs));
756  if (bddArray == NIL(bdd_node *)) {
757    (void) fprintf(vis_stderr,"** synth error: Could not allocate space ");
758    (void) fprintf(vis_stderr,"for an array of Bdd nodes.\n");
759    return NIL(bdd_node *);
760  }
761  arrayForEachItem(Mvf_Function_t *, combMvfs, i, mvf) {
762    mdd_t *mddTemp;
763
764    mddTemp = array_fetch(mdd_t *, mvf, 1);
765    bddArray[i] = (bdd_node *) bdd_extract_node_as_is(mddTemp);
766    bdd_ref(bddArray[i]);
767  }
768  return bddArray;
769}
770
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