RESTRICTBDDNODE(3)						   BDD FUNCTIONS						RESTRICTBDDNODE(3)

NAME

       restrictbddnode - substitutes a variable by a zero or one, in a bdd.

ORIGIN

       This  software  belongs	to  the  ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in
       Paris, France.

       Web : http://asim.lip6.fr/recherche/alliance/
       E-mail : alliance-users@asim.lip6.fr

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 );

SEE ALSO

       bdd(1)

BUG REPORT

       This tool is under development at the ASIM department of the LIP6 laboratory.
       We need your feedback to improve documentation and tools.

ASIM
/LIP6							  October 1, 1997						RESTRICTBDDNODE(3)