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Diffstat (limited to 'src/bdd/extrab/extraBddSet.c')
| -rw-r--r-- | src/bdd/extrab/extraBddSet.c | 941 |
1 files changed, 941 insertions, 0 deletions
diff --git a/src/bdd/extrab/extraBddSet.c b/src/bdd/extrab/extraBddSet.c new file mode 100644 index 00000000..882c474a --- /dev/null +++ b/src/bdd/extrab/extraBddSet.c @@ -0,0 +1,941 @@ +/**CFile*********************************************************************** + + FileName [zSubSet.c] + + PackageName [extra] + + Synopsis [Experimental version of some ZDD operators.] + + Description [External procedures included in this module: + <ul> + <li> Extra_zddSubSet(); + <li> Extra_zddSupSet(); + <li> Extra_zddNotSubSet(); + <li> Extra_zddNotSupSet(); + <li> Extra_zddMaxNotSupSet(); + <li> Extra_zddEmptyBelongs(); + <li> Extra_zddIsOneSubset(); + </ul> + Internal procedures included in this module: + <ul> + <li> extraZddSubSet(); + <li> extraZddSupSet(); + <li> extraZddNotSubSet(); + <li> extraZddNotSupSet(); + <li> extraZddMaxNotSupSet(); + </ul> + Static procedures included in this module: + <ul> + </ul> + + SubSet, SupSet, NotSubSet, NotSupSet were introduced + by O.Coudert to solve problems arising in two-level SOP + minimization. See O. Coudert, "Two-Level Logic Minimization: + An Overview", Integration. Vol. 17, No. 2, pp. 97-140, Oct 1994. + ] + + SeeAlso [] + + Author [Alan Mishchenko] + + Copyright [] + + Revision [$zSubSet.c, v.1.2, November 16, 2000, alanmi $] + +******************************************************************************/ + +#include "extraBdd.h" + +ABC_NAMESPACE_IMPL_START + +/*---------------------------------------------------------------------------*/ +/* Constant declarations */ +/*---------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------*/ +/* Stucture declarations */ +/*---------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------*/ +/* Type declarations */ +/*---------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------*/ +/* Variable declarations */ +/*---------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------*/ +/* Macro declarations */ +/*---------------------------------------------------------------------------*/ + + +/**AutomaticStart*************************************************************/ + +/*---------------------------------------------------------------------------*/ +/* Static function prototypes */ +/*---------------------------------------------------------------------------*/ + +/**AutomaticEnd***************************************************************/ + + +/*---------------------------------------------------------------------------*/ +/* Definition of exported functions */ +/*---------------------------------------------------------------------------*/ + +/**Function******************************************************************** + + Synopsis [Computes subsets in X that are contained in some of the subsets of Y.] + + Description [] + + SideEffects [] + + SeeAlso [Extra_zddNotSubSet, Extra_zddSupSet, Extra_zddNotSupSet] + +******************************************************************************/ +DdNode * +Extra_zddSubSet( + DdManager * dd, + DdNode * X, + DdNode * Y) +{ + DdNode *res; + int autoDynZ; + + autoDynZ = dd->autoDynZ; + dd->autoDynZ = 0; + + do { + dd->reordered = 0; + res = extraZddSubSet(dd, X, Y); + } while (dd->reordered == 1); + dd->autoDynZ = autoDynZ; + return(res); + +} /* end of Extra_zddSubSet */ + + +/**Function******************************************************************** + + Synopsis [Computes subsets in X that contain some of the subsets of Y.] + + Description [] + + SideEffects [] + + SeeAlso [Extra_zddSubSet, Extra_zddNotSubSet, Extra_zddNotSupSet] + +******************************************************************************/ +DdNode * +Extra_zddSupSet( + DdManager * dd, + DdNode * X, + DdNode * Y) +{ + DdNode *res; + int autoDynZ; + + autoDynZ = dd->autoDynZ; + dd->autoDynZ = 0; + + do { + dd->reordered = 0; + res = extraZddSupSet(dd, X, Y); + } while (dd->reordered == 1); + dd->autoDynZ = autoDynZ; + return(res); + +} /* end of Extra_zddSupSet */ + +/**Function******************************************************************** + + Synopsis [Computes subsets in X that are not contained in any of the subsets of Y.] + + Description [] + + SideEffects [] + + SeeAlso [Extra_zddSubSet, Extra_zddSupSet, Extra_zddNotSupSet] + +******************************************************************************/ +DdNode * +Extra_zddNotSubSet( + DdManager * dd, + DdNode * X, + DdNode * Y) +{ + DdNode *res; + int autoDynZ; + + autoDynZ = dd->autoDynZ; + dd->autoDynZ = 0; + + do { + dd->reordered = 0; + res = extraZddNotSubSet(dd, X, Y); + } while (dd->reordered == 1); + dd->autoDynZ = autoDynZ; + return(res); + +} /* end of Extra_zddNotSubSet */ + + +/**Function******************************************************************** + + Synopsis [Computes subsets in X that do not contain any of the subsets of Y.] + + Description [] + + SideEffects [] + + SeeAlso [Extra_zddSubSet, Extra_zddSupSet, Extra_zddNotSubSet] + +******************************************************************************/ +DdNode * +Extra_zddNotSupSet( + DdManager * dd, + DdNode * X, + DdNode * Y) +{ + DdNode *res; + int autoDynZ; + + autoDynZ = dd->autoDynZ; + dd->autoDynZ = 0; + + do { + dd->reordered = 0; + res = extraZddNotSupSet(dd, X, Y); + } while (dd->reordered == 1); + dd->autoDynZ = autoDynZ; + return(res); + +} /* end of Extra_zddNotSupSet */ + + + +/**Function******************************************************************** + + Synopsis [Computes the maximal of subsets in X not contained in any of the subsets of Y.] + + Description [] + + SideEffects [] + + SeeAlso [Extra_zddSubSet, Extra_zddSupSet, Extra_zddSubSet, Extra_zddNotSupSet] + +******************************************************************************/ +DdNode * +Extra_zddMaxNotSupSet( + DdManager * dd, + DdNode * X, + DdNode * Y) +{ + DdNode *res; + int autoDynZ; + + autoDynZ = dd->autoDynZ; + dd->autoDynZ = 0; + + do { + dd->reordered = 0; + res = extraZddMaxNotSupSet(dd, X, Y); + } while (dd->reordered == 1); + dd->autoDynZ = autoDynZ; + return(res); + +} /* end of Extra_zddMaxNotSupSet */ + + +/**Function******************************************************************** + + Synopsis [Returns 1 if ZDD contains the empty combination; 0 otherwise.] + + Description [] + + SideEffects [] + + SeeAlso [] + +******************************************************************************/ +int +Extra_zddEmptyBelongs( + DdManager *dd, + DdNode* zS ) +{ + while ( zS->index != CUDD_MAXINDEX ) + zS = cuddE( zS ); + return (int)( zS == z1 ); + +} /* end of Extra_zddEmptyBelongs */ + + +/**Function******************************************************************** + + Synopsis [Returns 1 if the set is empty or consists of one subset only.] + + Description [] + + SideEffects [] + + SeeAlso [] + +******************************************************************************/ +int +Extra_zddIsOneSubset( + DdManager * dd, + DdNode * zS ) +{ + while ( zS->index != CUDD_MAXINDEX ) + { + assert( cuddT(zS) != z0 ); + if ( cuddE(zS) != z0 ) + return 0; + zS = cuddT( zS ); + } + return (int)( zS == z1 ); + +} /* end of Extra_zddEmptyBelongs */ + + +/*---------------------------------------------------------------------------*/ +/* Definition of internal functions */ +/*---------------------------------------------------------------------------*/ + +/**Function******************************************************************** + + Synopsis [Performs the recursive step of Extra_zddSubSet.] + + Description [] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +DdNode* extraZddSubSet( DdManager *dd, DdNode *X, DdNode *Y ) +{ + DdNode *zRes; + statLine(dd); + /* any comb is a subset of itself */ + if ( X == Y ) + return X; + /* if X is empty, the result is empty */ + if ( X == z0 ) + return z0; + /* combs in X are notsubsets of non-existant combs in Y */ + if ( Y == z0 ) + return z0; + /* the empty comb is contained in all combs of Y */ + if ( X == z1 ) + return z1; + /* only {()} is the subset of {()} */ + if ( Y == z1 ) /* check whether the empty combination is present in X */ + return ( Extra_zddEmptyBelongs( dd, X )? z1: z0 ); + + /* check cache */ + zRes = cuddCacheLookup2Zdd(dd, extraZddSubSet, X, Y); + if (zRes) + return(zRes); + else + { + DdNode *zRes0, *zRes1, *zTemp; + int TopLevelX = dd->permZ[ X->index ]; + int TopLevelY = dd->permZ[ Y->index ]; + + if ( TopLevelX < TopLevelY ) + { + /* compute combs of X without var that are notsubsets of combs with Y */ + zRes = extraZddSubSet( dd, cuddE( X ), Y ); + if ( zRes == NULL ) return NULL; + } + else if ( TopLevelX == TopLevelY ) + { + /* merge combs of Y with and without var */ + zTemp = cuddZddUnion( dd, cuddE( Y ), cuddT( Y ) ); + if ( zTemp == NULL ) + return NULL; + cuddRef( zTemp ); + + /* compute combs of X without var that are notsubsets of combs is Temp */ + zRes0 = extraZddSubSet( dd, cuddE( X ), zTemp ); + if ( zRes0 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zTemp ); + return NULL; + } + cuddRef( zRes0 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + + /* combs of X with var that are notsubsets of combs in Y with var */ + zRes1 = extraZddSubSet( dd, cuddT( X ), cuddT( Y ) ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zRes1 ); + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else /* if ( TopLevelX > TopLevelY ) */ + { + /* merge combs of Y with and without var */ + zTemp = cuddZddUnion( dd, cuddE( Y ), cuddT( Y ) ); + if ( zTemp == NULL ) return NULL; + cuddRef( zTemp ); + + /* compute combs that are notsubsets of Temp */ + zRes = extraZddSubSet( dd, X, zTemp ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zTemp ); + return NULL; + } + cuddRef( zRes ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + cuddDeref( zRes ); + } + + /* insert the result into cache */ + cuddCacheInsert2(dd, extraZddSubSet, X, Y, zRes); + return zRes; + } +} /* end of extraZddSubSet */ + + +/**Function******************************************************************** + + Synopsis [Performs the recursive step of Extra_zddSupSet.] + + Description [] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +DdNode* extraZddSupSet( DdManager *dd, DdNode *X, DdNode *Y ) +{ + DdNode *zRes; + statLine(dd); + /* any comb is a superset of itself */ + if ( X == Y ) + return X; + /* no comb in X is superset of non-existing combs */ + if ( Y == z0 ) + return z0; + /* any comb in X is the superset of the empty comb */ + if ( Extra_zddEmptyBelongs( dd, Y ) ) + return X; + /* if X is empty, the result is empty */ + if ( X == z0 ) + return z0; + /* if X is the empty comb (and Y does not contain it!), return empty */ + if ( X == z1 ) + return z0; + + /* check cache */ + zRes = cuddCacheLookup2Zdd(dd, extraZddSupSet, X, Y); + if (zRes) + return(zRes); + else + { + DdNode *zRes0, *zRes1, *zTemp; + int TopLevelX = dd->permZ[ X->index ]; + int TopLevelY = dd->permZ[ Y->index ]; + + if ( TopLevelX < TopLevelY ) + { + /* combinations of X without label that are supersets of combinations with Y */ + zRes0 = extraZddSupSet( dd, cuddE( X ), Y ); + if ( zRes0 == NULL ) return NULL; + cuddRef( zRes0 ); + + /* combinations of X with label that are supersets of combinations with Y */ + zRes1 = extraZddSupSet( dd, cuddT( X ), Y ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zRes1 ); + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else if ( TopLevelX == TopLevelY ) + { + /* combs of X without var that are supersets of combs of Y without var */ + zRes0 = extraZddSupSet( dd, cuddE( X ), cuddE( Y ) ); + if ( zRes0 == NULL ) return NULL; + cuddRef( zRes0 ); + + /* merge combs of Y with and without var */ + zTemp = cuddZddUnion( dd, cuddE( Y ), cuddT( Y ) ); + if ( zTemp == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zTemp ); + + /* combs of X with label that are supersets of combs in Temp */ + zRes1 = extraZddSupSet( dd, cuddT( X ), zTemp ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + return NULL; + } + cuddRef( zRes1 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else /* if ( TopLevelX > TopLevelY ) */ + { + /* combs of X that are supersets of combs of Y without label */ + zRes = extraZddSupSet( dd, X, cuddE( Y ) ); + if ( zRes == NULL ) return NULL; + } + + /* insert the result into cache */ + cuddCacheInsert2(dd, extraZddSupSet, X, Y, zRes); + return zRes; + } +} /* end of extraZddSupSet */ + + +/**Function******************************************************************** + + Synopsis [Performs the recursive step of Extra_zddNotSubSet.] + + Description [] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +DdNode* extraZddNotSubSet( DdManager *dd, DdNode *X, DdNode *Y ) +{ + DdNode *zRes; + statLine(dd); + /* any comb is a subset of itself */ + if ( X == Y ) + return z0; + /* combs in X are notsubsets of non-existant combs in Y */ + if ( Y == z0 ) + return X; + /* only {()} is the subset of {()} */ + if ( Y == z1 ) /* remove empty combination from X */ + return cuddZddDiff( dd, X, z1 ); + /* if X is empty, the result is empty */ + if ( X == z0 ) + return z0; + /* the empty comb is contained in all combs of Y */ + if ( X == z1 ) + return z0; + + /* check cache */ + zRes = cuddCacheLookup2Zdd(dd, extraZddNotSubSet, X, Y); + if (zRes) + return(zRes); + else + { + DdNode *zRes0, *zRes1, *zTemp; + int TopLevelX = dd->permZ[ X->index ]; + int TopLevelY = dd->permZ[ Y->index ]; + + if ( TopLevelX < TopLevelY ) + { + /* compute combs of X without var that are notsubsets of combs with Y */ + zRes0 = extraZddNotSubSet( dd, cuddE( X ), Y ); + if ( zRes0 == NULL ) + return NULL; + cuddRef( zRes0 ); + + /* combs of X with var cannot be subsets of combs without var in Y */ + zRes1 = cuddT( X ); + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddDeref( zRes0 ); + } + else if ( TopLevelX == TopLevelY ) + { + /* merge combs of Y with and without var */ + zTemp = cuddZddUnion( dd, cuddE( Y ), cuddT( Y ) ); + if ( zTemp == NULL ) + return NULL; + cuddRef( zTemp ); + + /* compute combs of X without var that are notsubsets of combs is Temp */ + zRes0 = extraZddNotSubSet( dd, cuddE( X ), zTemp ); + if ( zRes0 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zTemp ); + return NULL; + } + cuddRef( zRes0 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + + /* combs of X with var that are notsubsets of combs in Y with var */ + zRes1 = extraZddNotSubSet( dd, cuddT( X ), cuddT( Y ) ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zRes1 ); + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else /* if ( TopLevelX > TopLevelY ) */ + { + /* merge combs of Y with and without var */ + zTemp = cuddZddUnion( dd, cuddE( Y ), cuddT( Y ) ); + if ( zTemp == NULL ) + return NULL; + cuddRef( zTemp ); + + /* compute combs that are notsubsets of Temp */ + zRes = extraZddNotSubSet( dd, X, zTemp ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zTemp ); + return NULL; + } + cuddRef( zRes ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + cuddDeref( zRes ); + } + + /* insert the result into cache */ + cuddCacheInsert2(dd, extraZddNotSubSet, X, Y, zRes); + return zRes; + } +} /* end of extraZddNotSubSet */ + + +/**Function******************************************************************** + + Synopsis [Performs the recursive step of Extra_zddNotSupSet.] + + Description [] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +DdNode* extraZddNotSupSet( DdManager *dd, DdNode *X, DdNode *Y ) +{ + DdNode *zRes; + statLine(dd); + /* any comb is a superset of itself */ + if ( X == Y ) + return z0; + /* no comb in X is superset of non-existing combs */ + if ( Y == z0 ) + return X; + /* any comb in X is the superset of the empty comb */ + if ( Extra_zddEmptyBelongs( dd, Y ) ) + return z0; + /* if X is empty, the result is empty */ + if ( X == z0 ) + return z0; + /* if X is the empty comb (and Y does not contain it!), return it */ + if ( X == z1 ) + return z1; + + /* check cache */ + zRes = cuddCacheLookup2Zdd(dd, extraZddNotSupSet, X, Y); + if (zRes) + return(zRes); + else + { + DdNode *zRes0, *zRes1, *zTemp; + int TopLevelX = dd->permZ[ X->index ]; + int TopLevelY = dd->permZ[ Y->index ]; + + if ( TopLevelX < TopLevelY ) + { + /* combinations of X without label that are supersets of combinations of Y */ + zRes0 = extraZddNotSupSet( dd, cuddE( X ), Y ); + if ( zRes0 == NULL ) + return NULL; + cuddRef( zRes0 ); + + /* combinations of X with label that are supersets of combinations of Y */ + zRes1 = extraZddNotSupSet( dd, cuddT( X ), Y ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zRes1 ); + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else if ( TopLevelX == TopLevelY ) + { + /* combs of X without var that are not supersets of combs of Y without var */ + zRes0 = extraZddNotSupSet( dd, cuddE( X ), cuddE( Y ) ); + if ( zRes0 == NULL ) + return NULL; + cuddRef( zRes0 ); + + /* merge combs of Y with and without var */ + zTemp = cuddZddUnion( dd, cuddE( Y ), cuddT( Y ) ); + if ( zTemp == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zTemp ); + + /* combs of X with label that are supersets of combs in Temp */ + zRes1 = extraZddNotSupSet( dd, cuddT( X ), zTemp ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + return NULL; + } + cuddRef( zRes1 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else /* if ( TopLevelX > TopLevelY ) */ + { + /* combs of X that are supersets of combs of Y without label */ + zRes = extraZddNotSupSet( dd, X, cuddE( Y ) ); + if ( zRes == NULL ) return NULL; + } + + /* insert the result into cache */ + cuddCacheInsert2(dd, extraZddNotSupSet, X, Y, zRes); + return zRes; + } +} /* end of extraZddNotSupSet */ + + + +/**Function******************************************************************** + + Synopsis [Performs the recursive step of Extra_zddMaxNotSupSet.] + + Description [] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +DdNode* extraZddMaxNotSupSet( DdManager *dd, DdNode *X, DdNode *Y ) +{ + DdNode *zRes; + statLine(dd); + /* any comb is a superset of itself */ + if ( X == Y ) + return z0; + /* no comb in X is superset of non-existing combs */ + if ( Y == z0 ) + return extraZddMaximal( dd, X ); + /* any comb in X is the superset of the empty comb */ + if ( Extra_zddEmptyBelongs( dd, Y ) ) + return z0; + /* if X is empty, the result is empty */ + if ( X == z0 ) + return z0; + /* if X is the empty comb (and Y does not contain it!), return it */ + if ( X == z1 ) + return z1; + + /* check cache */ + zRes = cuddCacheLookup2Zdd(dd, extraZddMaxNotSupSet, X, Y); + if (zRes) + return(zRes); + else + { + DdNode *zRes0, *zRes1, *zTemp; + int TopLevelX = dd->permZ[ X->index ]; + int TopLevelY = dd->permZ[ Y->index ]; + + if ( TopLevelX < TopLevelY ) + { + /* combinations of X without label that are supersets of combinations with Y */ + zRes0 = extraZddMaxNotSupSet( dd, cuddE( X ), Y ); + if ( zRes0 == NULL ) + return NULL; + cuddRef( zRes0 ); + + /* combinations of X with label that are supersets of combinations with Y */ + zRes1 = extraZddMaxNotSupSet( dd, cuddT( X ), Y ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zRes1 ); + + /* ---------------------------------------------------- */ + /* remove subsets without this element covered by subsets with this element */ + zRes0 = extraZddNotSubSet(dd, zTemp = zRes0, zRes1); + if ( zRes0 == NULL ) + { + Cudd_RecursiveDerefZdd(dd, zTemp); + Cudd_RecursiveDerefZdd(dd, zRes1); + return NULL; + } + cuddRef( zRes0 ); + Cudd_RecursiveDerefZdd(dd, zTemp); + /* ---------------------------------------------------- */ + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else if ( TopLevelX == TopLevelY ) + { + /* combs of X without var that are supersets of combs of Y without var */ + zRes0 = extraZddMaxNotSupSet( dd, cuddE( X ), cuddE( Y ) ); + if ( zRes0 == NULL ) + return NULL; + cuddRef( zRes0 ); + + /* merge combs of Y with and without var */ + zTemp = cuddZddUnion( dd, cuddE( Y ), cuddT( Y ) ); + if ( zTemp == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + return NULL; + } + cuddRef( zTemp ); + + /* combs of X with label that are supersets of combs in Temp */ + zRes1 = extraZddMaxNotSupSet( dd, cuddT( X ), zTemp ); + if ( zRes1 == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + return NULL; + } + cuddRef( zRes1 ); + Cudd_RecursiveDerefZdd( dd, zTemp ); + + /* ---------------------------------------------------- */ + /* remove subsets without this element covered by subsets with this element */ + zRes0 = extraZddNotSubSet(dd, zTemp = zRes0, zRes1); + if ( zRes0 == NULL ) + { + Cudd_RecursiveDerefZdd(dd, zTemp); + Cudd_RecursiveDerefZdd(dd, zRes1); + return NULL; + } + cuddRef( zRes0 ); + Cudd_RecursiveDerefZdd(dd, zTemp); + /* ---------------------------------------------------- */ + + /* compose Res0 and Res1 with the given ZDD variable */ + zRes = cuddZddGetNode( dd, X->index, zRes1, zRes0 ); + if ( zRes == NULL ) + { + Cudd_RecursiveDerefZdd( dd, zRes0 ); + Cudd_RecursiveDerefZdd( dd, zRes1 ); + return NULL; + } + cuddDeref( zRes0 ); + cuddDeref( zRes1 ); + } + else /* if ( TopLevelX > TopLevelY ) */ + { + /* combs of X that are supersets of combs of Y without label */ + zRes = extraZddMaxNotSupSet( dd, X, cuddE( Y ) ); + if ( zRes == NULL ) return NULL; + } + + /* insert the result into cache */ + cuddCacheInsert2(dd, extraZddMaxNotSupSet, X, Y, zRes); + return zRes; + } +} /* end of extraZddMaxNotSupSet */ + + +/*---------------------------------------------------------------------------*/ +/* Definition of static functions */ +/*---------------------------------------------------------------------------*/ + + +ABC_NAMESPACE_IMPL_END |