/**CFile*********************************************************************** FileName [cuddZddLin.c] PackageName [cudd] Synopsis [Procedures for dynamic variable ordering of ZDDs.] Description [Internal procedures included in this module: Static procedures included in this module: ] SeeAlso [cuddLinear.c cuddZddReord.c] Author [Fabio Somenzi] Copyright [ This file was created at the University of Colorado at Boulder. The University of Colorado at Boulder makes no warranty about the suitability of this software for any purpose. It is presented on an AS IS basis.] ******************************************************************************/ #include "util_hack.h" #include "cuddInt.h" /*---------------------------------------------------------------------------*/ /* Constant declarations */ /*---------------------------------------------------------------------------*/ #define CUDD_SWAP_MOVE 0 #define CUDD_LINEAR_TRANSFORM_MOVE 1 #define CUDD_INVERSE_TRANSFORM_MOVE 2 /*---------------------------------------------------------------------------*/ /* Stucture declarations */ /*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/ /* Type declarations */ /*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/ /* Variable declarations */ /*---------------------------------------------------------------------------*/ #ifndef lint static char rcsid[] DD_UNUSED = "$Id: cuddZddLin.c,v 1.1.1.1 2003/02/24 22:23:54 wjiang Exp $"; #endif extern int *zdd_entry; extern int zddTotalNumberSwapping; static int zddTotalNumberLinearTr; static DdNode *empty; /*---------------------------------------------------------------------------*/ /* Macro declarations */ /*---------------------------------------------------------------------------*/ /**AutomaticStart*************************************************************/ /*---------------------------------------------------------------------------*/ /* Static function prototypes */ /*---------------------------------------------------------------------------*/ static int cuddZddLinearAux ARGS((DdManager *table, int x, int xLow, int xHigh)); static Move * cuddZddLinearUp ARGS((DdManager *table, int y, int xLow, Move *prevMoves)); static Move * cuddZddLinearDown ARGS((DdManager *table, int x, int xHigh, Move *prevMoves)); static int cuddZddLinearBackward ARGS((DdManager *table, int size, Move *moves)); static Move* cuddZddUndoMoves ARGS((DdManager *table, Move *moves)); /**AutomaticEnd***************************************************************/ /*---------------------------------------------------------------------------*/ /* Definition of exported functions */ /*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/ /* Definition of internal functions */ /*---------------------------------------------------------------------------*/ /**Function******************************************************************** Synopsis [Implementation of the linear sifting algorithm for ZDDs.] Description [Implementation of the linear sifting algorithm for ZDDs. Assumes that no dead nodes are present.
  1. Order all the variables according to the number of entries in each unique table.
  2. Sift the variable up and down and applies the XOR transformation, remembering each time the total size of the DD heap.
  3. Select the best permutation.
  4. Repeat 3 and 4 for all variables.
Returns 1 if successful; 0 otherwise.] SideEffects [None] SeeAlso [] ******************************************************************************/ int cuddZddLinearSifting( DdManager * table, int lower, int upper) { int i; int *var; int size; int x; int result; #ifdef DD_STATS int previousSize; #endif size = table->sizeZ; empty = table->zero; /* Find order in which to sift variables. */ var = NULL; zdd_entry = ALLOC(int, size); if (zdd_entry == NULL) { table->errorCode = CUDD_MEMORY_OUT; goto cuddZddSiftingOutOfMem; } var = ALLOC(int, size); if (var == NULL) { table->errorCode = CUDD_MEMORY_OUT; goto cuddZddSiftingOutOfMem; } for (i = 0; i < size; i++) { x = table->permZ[i]; zdd_entry[i] = table->subtableZ[x].keys; var[i] = i; } qsort((void *)var, size, sizeof(int), (int (*)(const void *, const void *))cuddZddUniqueCompare); /* Now sift. */ for (i = 0; i < ddMin(table->siftMaxVar, size); i++) { if (zddTotalNumberSwapping >= table->siftMaxSwap) break; x = table->permZ[var[i]]; if (x < lower || x > upper) continue; #ifdef DD_STATS previousSize = table->keysZ; #endif result = cuddZddLinearAux(table, x, lower, upper); if (!result) goto cuddZddSiftingOutOfMem; #ifdef DD_STATS if (table->keysZ < (unsigned) previousSize) { (void) fprintf(table->out,"-"); } else if (table->keysZ > (unsigned) previousSize) { (void) fprintf(table->out,"+"); /* should never happen */ (void) fprintf(table->out,"\nSize increased from %d to %d while sifting variable %d\n", previousSize, table->keysZ , var[i]); } else { (void) fprintf(table->out,"="); } fflush(table->out); #endif } FREE(var); FREE(zdd_entry); return(1); cuddZddSiftingOutOfMem: if (zdd_entry != NULL) FREE(zdd_entry); if (var != NULL) FREE(var); return(0); } /* end of cuddZddLinearSifting */ /*---------------------------------------------------------------------------*/ /* Definition of static functions */ /*---------------------------------------------------------------------------*/ /**Function******************************************************************** Synopsis [Linearly combines two adjacent variables.] Description [Linearly combines two adjacent variables. It assumes that no dead nodes are present on entry to this procedure. The procedure then guarantees that no dead nodes will be present when it terminates. cuddZddLinearInPlace assumes that x < y. Returns the number of keys in the table if successful; 0 otherwise.] SideEffects [None] SeeAlso [cuddZddSwapInPlace cuddLinearInPlace] ******************************************************************************/ int cuddZddLinearInPlace( DdManager * table, int x, int y) { DdNodePtr *xlist, *ylist; int xindex, yindex; int xslots, yslots; int xshift, yshift; int oldxkeys, oldykeys; int newxkeys, newykeys; int i; int posn; DdNode *f, *f1, *f0, *f11, *f10, *f01, *f00; DdNode *newf1, *newf0, *g, *next, *previous; DdNode *special; #ifdef DD_DEBUG assert(x < y); assert(cuddZddNextHigh(table,x) == y); assert(table->subtableZ[x].keys != 0); assert(table->subtableZ[y].keys != 0); assert(table->subtableZ[x].dead == 0); assert(table->subtableZ[y].dead == 0); #endif zddTotalNumberLinearTr++; /* Get parameters of x subtable. */ xindex = table->invpermZ[x]; xlist = table->subtableZ[x].nodelist; oldxkeys = table->subtableZ[x].keys; xslots = table->subtableZ[x].slots; xshift = table->subtableZ[x].shift; newxkeys = 0; /* Get parameters of y subtable. */ yindex = table->invpermZ[y]; ylist = table->subtableZ[y].nodelist; oldykeys = table->subtableZ[y].keys; yslots = table->subtableZ[y].slots; yshift = table->subtableZ[y].shift; newykeys = oldykeys; /* The nodes in the x layer are put in two chains. The chain ** pointed by g holds the normal nodes. When re-expressed they stay ** in the x list. The chain pointed by special holds the elements ** that will move to the y list. */ g = special = NULL; for (i = 0; i < xslots; i++) { f = xlist[i]; if (f == NULL) continue; xlist[i] = NULL; while (f != NULL) { next = f->next; f1 = cuddT(f); /* if (f1->index == yindex) */ cuddSatDec(f1->ref); f0 = cuddE(f); /* if (f0->index == yindex) */ cuddSatDec(f0->ref); if ((int) f1->index == yindex && cuddE(f1) == empty && (int) f0->index != yindex) { f->next = special; special = f; } else { f->next = g; g = f; } f = next; } /* while there are elements in the collision chain */ } /* for each slot of the x subtable */ /* Mark y nodes with pointers from above x. We mark them by ** changing their index to x. */ for (i = 0; i < yslots; i++) { f = ylist[i]; while (f != NULL) { if (f->ref != 0) { f->index = xindex; } f = f->next; } /* while there are elements in the collision chain */ } /* for each slot of the y subtable */ /* Move special nodes to the y list. */ f = special; while (f != NULL) { next = f->next; f1 = cuddT(f); f11 = cuddT(f1); cuddT(f) = f11; cuddSatInc(f11->ref); f0 = cuddE(f); cuddSatInc(f0->ref); f->index = yindex; /* Insert at the beginning of the list so that it will be ** found first if there is a duplicate. The duplicate will ** eventually be moved or garbage collected. No node ** re-expression will add a pointer to it. */ posn = ddHash(f11, f0, yshift); f->next = ylist[posn]; ylist[posn] = f; newykeys++; f = next; } /* Take care of the remaining x nodes that must be re-expressed. ** They form a linked list pointed by g. */ f = g; while (f != NULL) { #ifdef DD_COUNT table->swapSteps++; #endif next = f->next; /* Find f1, f0, f11, f10, f01, f00. */ f1 = cuddT(f); if ((int) f1->index == yindex || (int) f1->index == xindex) { f11 = cuddT(f1); f10 = cuddE(f1); } else { f11 = empty; f10 = f1; } f0 = cuddE(f); if ((int) f0->index == yindex || (int) f0->index == xindex) { f01 = cuddT(f0); f00 = cuddE(f0); } else { f01 = empty; f00 = f0; } /* Create the new T child. */ if (f01 == empty) { newf1 = f10; cuddSatInc(newf1->ref); } else { /* Check ylist for triple (yindex, f01, f10). */ posn = ddHash(f01, f10, yshift); /* For each element newf1 in collision list ylist[posn]. */ newf1 = ylist[posn]; /* Search the collision chain skipping the marked nodes. */ while (newf1 != NULL) { if (cuddT(newf1) == f01 && cuddE(newf1) == f10 && (int) newf1->index == yindex) { cuddSatInc(newf1->ref); break; /* match */ } newf1 = newf1->next; } /* while newf1 */ if (newf1 == NULL) { /* no match */ newf1 = cuddDynamicAllocNode(table); if (newf1 == NULL) goto zddSwapOutOfMem; newf1->index = yindex; newf1->ref = 1; cuddT(newf1) = f01; cuddE(newf1) = f10; /* Insert newf1 in the collision list ylist[pos]; ** increase the ref counts of f01 and f10 */ newykeys++; newf1->next = ylist[posn]; ylist[posn] = newf1; cuddSatInc(f01->ref); cuddSatInc(f10->ref); } } cuddT(f) = newf1; /* Do the same for f0. */ /* Create the new E child. */ if (f11 == empty) { newf0 = f00; cuddSatInc(newf0->ref); } else { /* Check ylist for triple (yindex, f11, f00). */ posn = ddHash(f11, f00, yshift); /* For each element newf0 in collision list ylist[posn]. */ newf0 = ylist[posn]; while (newf0 != NULL) { if (cuddT(newf0) == f11 && cuddE(newf0) == f00 && (int) newf0->index == yindex) { cuddSatInc(newf0->ref); break; /* match */ } newf0 = newf0->next; } /* while newf0 */ if (newf0 == NULL) { /* no match */ newf0 = cuddDynamicAllocNode(table); if (newf0 == NULL) goto zddSwapOutOfMem; newf0->index = yindex; newf0->ref = 1; cuddT(newf0) = f11; cuddE(newf0) = f00; /* Insert newf0 in the collision list ylist[posn]; ** increase the ref counts of f11 and f00. */ newykeys++; newf0->next = ylist[posn]; ylist[posn] = newf0; cuddSatInc(f11->ref); cuddSatInc(f00->ref); } } cuddE(f) = newf0; /* Re-insert the modified f in xlist. ** The modified f does not already exists in xlist. ** (Because of the uniqueness of the cofactors.) */ posn = ddHash(newf1, newf0, xshift); newxkeys++; f->next = xlist[posn]; xlist[posn] = f; f = next; } /* while f != NULL */ /* GC the y layer and move the marked nodes to the x list. */ /* For each node f in ylist. */ for (i = 0; i < yslots; i++) { previous = NULL; f = ylist[i]; while (f != NULL) { next = f->next; if (f->ref == 0) { cuddSatDec(cuddT(f)->ref); cuddSatDec(cuddE(f)->ref); cuddDeallocNode(table, f); newykeys--; if (previous == NULL) ylist[i] = next; else previous->next = next; } else if ((int) f->index == xindex) { /* move marked node */ if (previous == NULL) ylist[i] = next; else previous->next = next; f1 = cuddT(f); cuddSatDec(f1->ref); /* Check ylist for triple (yindex, f1, empty). */ posn = ddHash(f1, empty, yshift); /* For each element newf1 in collision list ylist[posn]. */ newf1 = ylist[posn]; while (newf1 != NULL) { if (cuddT(newf1) == f1 && cuddE(newf1) == empty && (int) newf1->index == yindex) { cuddSatInc(newf1->ref); break; /* match */ } newf1 = newf1->next; } /* while newf1 */ if (newf1 == NULL) { /* no match */ newf1 = cuddDynamicAllocNode(table); if (newf1 == NULL) goto zddSwapOutOfMem; newf1->index = yindex; newf1->ref = 1; cuddT(newf1) = f1; cuddE(newf1) = empty; /* Insert newf1 in the collision list ylist[posn]; ** increase the ref counts of f1 and empty. */ newykeys++; newf1->next = ylist[posn]; ylist[posn] = newf1; if (posn == i && previous == NULL) previous = newf1; cuddSatInc(f1->ref); cuddSatInc(empty->ref); } cuddT(f) = newf1; f0 = cuddE(f); /* Insert f in x list. */ posn = ddHash(newf1, f0, xshift); newxkeys++; newykeys--; f->next = xlist[posn]; xlist[posn] = f; } else { previous = f; } f = next; } /* while f */ } /* for i */ /* Set the appropriate fields in table. */ table->subtableZ[x].keys = newxkeys; table->subtableZ[y].keys = newykeys; table->keysZ += newxkeys + newykeys - oldxkeys - oldykeys; /* Update univ section; univ[x] remains the same. */ table->univ[y] = cuddT(table->univ[x]); #if 0 (void) fprintf(table->out,"x = %d y = %d\n", x, y); (void) Cudd_DebugCheck(table); (void) Cudd_CheckKeys(table); #endif return (table->keysZ); zddSwapOutOfMem: (void) fprintf(table->err, "Error: cuddZddSwapInPlace out of memory\n"); return (0); } /* end of cuddZddLinearInPlace */ /**Function******************************************************************** Synopsis [Given xLow <= x <= xHigh moves x up and down between the boundaries.] Description [Given xLow <= x <= xHigh moves x up and down between the boundaries. Finds the best position and does the required changes. Returns 1 if successful; 0 otherwise.] SideEffects [None] SeeAlso [] ******************************************************************************/ static int cuddZddLinearAux( DdManager * table, int x, int xLow, int xHigh) { Move *move; Move *moveUp; /* list of up move */ Move *moveDown; /* list of down move */ int initial_size; int result; initial_size = table->keysZ; #ifdef DD_DEBUG assert(table->subtableZ[x].keys > 0); #endif moveDown = NULL; moveUp = NULL; if (x == xLow) { moveDown = cuddZddLinearDown(table, x, xHigh, NULL); /* At this point x --> xHigh. */ if (moveDown == (Move *) CUDD_OUT_OF_MEM) goto cuddZddLinearAuxOutOfMem; /* Move backward and stop at best position. */ result = cuddZddLinearBackward(table, initial_size, moveDown); if (!result) goto cuddZddLinearAuxOutOfMem; } else if (x == xHigh) { moveUp = cuddZddLinearUp(table, x, xLow, NULL); /* At this point x --> xLow. */ if (moveUp == (Move *) CUDD_OUT_OF_MEM) goto cuddZddLinearAuxOutOfMem; /* Move backward and stop at best position. */ result = cuddZddLinearBackward(table, initial_size, moveUp); if (!result) goto cuddZddLinearAuxOutOfMem; } else if ((x - xLow) > (xHigh - x)) { /* must go down first: shorter */ moveDown = cuddZddLinearDown(table, x, xHigh, NULL); /* At this point x --> xHigh. */ if (moveDown == (Move *) CUDD_OUT_OF_MEM) goto cuddZddLinearAuxOutOfMem; moveUp = cuddZddUndoMoves(table,moveDown); #ifdef DD_DEBUG assert(moveUp == NULL || moveUp->x == x); #endif moveUp = cuddZddLinearUp(table, x, xLow, moveUp); if (moveUp == (Move *) CUDD_OUT_OF_MEM) goto cuddZddLinearAuxOutOfMem; /* Move backward and stop at best position. */ result = cuddZddLinearBackward(table, initial_size, moveUp); if (!result) goto cuddZddLinearAuxOutOfMem; } else { moveUp = cuddZddLinearUp(table, x, xLow, NULL); /* At this point x --> xHigh. */ if (moveUp == (Move *) CUDD_OUT_OF_MEM) goto cuddZddLinearAuxOutOfMem; /* Then move up. */ moveDown = cuddZddUndoMoves(table,moveUp); #ifdef DD_DEBUG assert(moveDown == NULL || moveDown->y == x); #endif moveDown = cuddZddLinearDown(table, x, xHigh, moveDown); if (moveDown == (Move *) CUDD_OUT_OF_MEM) goto cuddZddLinearAuxOutOfMem; /* Move backward and stop at best position. */ result = cuddZddLinearBackward(table, initial_size, moveDown); if (!result) goto cuddZddLinearAuxOutOfMem; } while (moveDown != NULL) { move = moveDown->next; cuddDeallocNode(table, (DdNode *)moveDown); moveDown = move; } while (moveUp != NULL) { move = moveUp->next; cuddDeallocNode(table, (DdNode *)moveUp); moveUp = move; } return(1); cuddZddLinearAuxOutOfMem: if (moveDown != (Move *) CUDD_OUT_OF_MEM) { while (moveDown != NULL) { move = moveDown->next; cuddDeallocNode(table, (DdNode *)moveDown); moveDown = move; } } if (moveUp != (Move *) CUDD_OUT_OF_MEM) { while (moveUp != NULL) { move = moveUp->next; cuddDeallocNode(table, (DdNode *)moveUp); moveUp = move; } } return(0); } /* end of cuddZddLinearAux */ /**Function******************************************************************** Synopsis [Sifts a variable up applying the XOR transformation.] Description [Sifts a variable up applying the XOR transformation. Moves y up until either it reaches the bound (xLow) or the size of the ZDD heap increases too much. Returns the set of moves in case of success; NULL if memory is full.] SideEffects [None] SeeAlso [] ******************************************************************************/ static Move * cuddZddLinearUp( DdManager * table, int y, int xLow, Move * prevMoves) { Move *moves; Move *move; int x; int size, newsize; int limitSize; moves = prevMoves; limitSize = table->keysZ; x = cuddZddNextLow(table, y); while (x >= xLow) { size = cuddZddSwapInPlace(table, x, y); if (size == 0) goto cuddZddLinearUpOutOfMem; newsize = cuddZddLinearInPlace(table, x, y); if (newsize == 0) goto cuddZddLinearUpOutOfMem; move = (Move *) cuddDynamicAllocNode(table); if (move == NULL) goto cuddZddLinearUpOutOfMem; move->x = x; move->y = y; move->next = moves; moves = move; move->flags = CUDD_SWAP_MOVE; if (newsize > size) { /* Undo transformation. The transformation we apply is ** its own inverse. Hence, we just apply the transformation ** again. */ newsize = cuddZddLinearInPlace(table,x,y); if (newsize == 0) goto cuddZddLinearUpOutOfMem; #ifdef DD_DEBUG if (newsize != size) { (void) fprintf(table->err,"Change in size after identity transformation! From %d to %d\n",size,newsize); } #endif } else { size = newsize; move->flags = CUDD_LINEAR_TRANSFORM_MOVE; } move->size = size; if ((double)size > (double)limitSize * table->maxGrowth) break; if (size < limitSize) limitSize = size; y = x; x = cuddZddNextLow(table, y); } return(moves); cuddZddLinearUpOutOfMem: while (moves != NULL) { move = moves->next; cuddDeallocNode(table, (DdNode *)moves); moves = move; } return((Move *) CUDD_OUT_OF_MEM); } /* end of cuddZddLinearUp */ /**Function******************************************************************** Synopsis [Sifts a variable down and applies the XOR transformation.] Description [Sifts a variable down. Moves x down until either it reaches the bound (xHigh) or the size of the ZDD heap increases too much. Returns the set of moves in case of success; NULL if memory is full.] SideEffects [None] SeeAlso [] ******************************************************************************/ static Move * cuddZddLinearDown( DdManager * table, int x, int xHigh, Move * prevMoves) { Move *moves; Move *move; int y; int size, newsize; int limitSize; moves = prevMoves; limitSize = table->keysZ; y = cuddZddNextHigh(table, x); while (y <= xHigh) { size = cuddZddSwapInPlace(table, x, y); if (size == 0) goto cuddZddLinearDownOutOfMem; newsize = cuddZddLinearInPlace(table, x, y); if (newsize == 0) goto cuddZddLinearDownOutOfMem; move = (Move *) cuddDynamicAllocNode(table); if (move == NULL) goto cuddZddLinearDownOutOfMem; move->x = x; move->y = y; move->next = moves; moves = move; move->flags = CUDD_SWAP_MOVE; if (newsize > size) { /* Undo transformation. The transformation we apply is ** its own inverse. Hence, we just apply the transformation ** again. */ newsize = cuddZddLinearInPlace(table,x,y); if (newsize == 0) goto cuddZddLinearDownOutOfMem; if (newsize != size) { (void) fprintf(table->err,"Change in size after identity transformation! From %d to %d\n",size,newsize); } } else { size = newsize; move->flags = CUDD_LINEAR_TRANSFORM_MOVE; } move->size = size; if ((double)size > (double)limitSize * table->maxGrowth) break; if (size < limitSize) limitSize = size; x = y; y = cuddZddNextHigh(table, x); } return(moves); cuddZddLinearDownOutOfMem: while (moves != NULL) { move = moves->next; cuddDeallocNode(table, (DdNode *)moves); moves = move; } return((Move *) CUDD_OUT_OF_MEM); } /* end of cuddZddLinearDown */ /**Function******************************************************************** Synopsis [Given a set of moves, returns the ZDD heap to the position giving the minimum size.] Description [Given a set of moves, returns the ZDD heap to the position giving the minimum size. In case of ties, returns to the closest position giving the minimum size. Returns 1 in case of success; 0 otherwise.] SideEffects [None] SeeAlso [] ******************************************************************************/ static int cuddZddLinearBackward( DdManager * table, int size, Move * moves) { Move *move; int res; /* Find the minimum size among moves. */ for (move = moves; move != NULL; move = move->next) { if (move->size < size) { size = move->size; } } for (move = moves; move != NULL; move = move->next) { if (move->size == size) return(1); if (move->flags == CUDD_LINEAR_TRANSFORM_MOVE) { res = cuddZddLinearInPlace(table,(int)move->x,(int)move->y); if (!res) return(0); } res = cuddZddSwapInPlace(table, move->x, move->y); if (!res) return(0); if (move->flags == CUDD_INVERSE_TRANSFORM_MOVE) { res = cuddZddLinearInPlace(table,(int)move->x,(int)move->y); if (!res) return(0); } } return(1); } /* end of cuddZddLinearBackward */ /**Function******************************************************************** Synopsis [Given a set of moves, returns the ZDD heap to the order in effect before the moves.] Description [Given a set of moves, returns the ZDD heap to the order in effect before the moves. Returns 1 in case of success; 0 otherwise.] SideEffects [None] ******************************************************************************/ static Move* cuddZddUndoMoves( DdManager * table, Move * moves) { Move *invmoves = NULL; Move *move; Move *invmove; int size; for (move = moves; move != NULL; move = move->next) { invmove = (Move *) cuddDynamicAllocNode(table); if (invmove == NULL) goto cuddZddUndoMovesOutOfMem; invmove->x = move->x; invmove->y = move->y; invmove->next = invmoves; invmoves = invmove; if (move->flags == CUDD_SWAP_MOVE) { invmove->flags = CUDD_SWAP_MOVE; size = cuddZddSwapInPlace(table,(int)move->x,(int)move->y); if (!size) goto cuddZddUndoMovesOutOfMem; } else if (move->flags == CUDD_LINEAR_TRANSFORM_MOVE) { invmove->flags = CUDD_INVERSE_TRANSFORM_MOVE; size = cuddZddLinearInPlace(table,(int)move->x,(int)move->y); if (!size) goto cuddZddUndoMovesOutOfMem; size = cuddZddSwapInPlace(table,(int)move->x,(int)move->y); if (!size) goto cuddZddUndoMovesOutOfMem; } else { /* must be CUDD_INVERSE_TRANSFORM_MOVE */ #ifdef DD_DEBUG (void) fprintf(table->err,"Unforseen event in ddUndoMoves!\n"); #endif invmove->flags = CUDD_LINEAR_TRANSFORM_MOVE; size = cuddZddSwapInPlace(table,(int)move->x,(int)move->y); if (!size) goto cuddZddUndoMovesOutOfMem; size = cuddZddLinearInPlace(table,(int)move->x,(int)move->y); if (!size) goto cuddZddUndoMovesOutOfMem; } invmove->size = size; } return(invmoves); cuddZddUndoMovesOutOfMem: while (invmoves != NULL) { move = invmoves->next; cuddDeallocNode(table, (DdNode *) invmoves); invmoves = move; } return((Move *) CUDD_OUT_OF_MEM); } /* end of cuddZddUndoMoves */