man restrictbddnode (3): substitutes a variable by a zero or one, in a bdd.

SYNOPSYS

#include "bdd101.h"
bddnode *restrictbddnode( BddSystem, BddNode, Variable, BddSubst )
  bddsystem *BddSystem;
  bddnode   *BddNode;
  bddvar     Variable;
  bddnode   *BddSubst;

PARAMETERS

BddSystem: The bdd system.
BddNode: The bdd node.
Variable: The variable to find.
BddSubst: The bdd to substitute with.

DESCRIPTION

restrictbddnode substitutes all the occurency of the variable Variable in the bdd node BddNode by the bdd node BddSubst, in the bdd system BddSystem. If a null pointer is given, the default bdd system is used. The BddSubst must be a the node BddSystem->ONE or BddSystem->ZERO.

RETURN VALUE

restrictbddnode returns the resulting bdd node.

ERRORS

"variable xxx out of range, error !"

: The Variable parameter must be less or equal to the BddSystem->NUMBER_VAR field.

"index xxx out of range, error !"

: The BddSubst parameter must have its index less than BDD_INDEX_MIN.

EXAMPLE

#include "bdd101.h"
   bddsystem  *BddSystem;
   bddcircuit *BddCircuit;
   bddnode    *BddVariable;
   bddnode    *BddNode;
   bddnode    *BddSubst;
   chain_list *Expr;
   bddvar         Variable;
   BddSystem  = createbddsystem( 100, 1000, 100, 50000 );
   BddCircuit = createbddcircuit( "hello_world", 10, 10, BddSystem );
   Expr = createablbinexpr( ABL_OR,
                            createablatom( "i0" ),
                            createablatom( "i1" ) );
   BddNode = addbddcircuitabl( BddCircuit, Expr );
   freeablexpr( Expr );
   BddSubst = BddSystem->ONE;
   BddVariable = searchbddcircuitin( (bddcircuit *)0, "i0" );
   Variable = getbddvarbyindex( (bddsystem *)0, BddVariable->INDEX );
   BddNode = restrictbddnode( (bddsystem *)0, BddNode, Variable, BddSubst );
   Expr = convertbddcircuitabl( BddCircuit, BddNode );
   /* displays '1' */
   viewablexpr( Expr, ABL_VIEW_VHDL );
   freeablexpr( Expr );
   destroybddsystem( (bddsystem *)0 );
   destroybddcircuit( (bddcircuit *)0 );