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1023 lines
27 KiB
1023 lines
27 KiB
/**CFile***********************************************************************
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FileName [cuddWindow.c]
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PackageName [cudd]
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Synopsis [Functions for variable reordering by window permutation.]
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Description [Internal procedures included in this module:
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<ul>
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<li> cuddWindowReorder()
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</ul>
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Static procedures included in this module:
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<ul>
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<li> ddWindow2()
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<li> ddWindowConv2()
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<li> ddPermuteWindow3()
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<li> ddWindow3()
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<li> ddWindowConv3()
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<li> ddPermuteWindow4()
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<li> ddWindow4()
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<li> ddWindowConv4()
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</ul>]
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Author [Fabio Somenzi]
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Copyright [Copyright (c) 1995-2012, Regents of the University of Colorado
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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Neither the name of the University of Colorado nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.]
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******************************************************************************/
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#include "util.h"
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#include "cuddInt.h"
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/*---------------------------------------------------------------------------*/
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/* Constant declarations */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* Stucture declarations */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* Type declarations */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* Variable declarations */
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/*---------------------------------------------------------------------------*/
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#ifndef lint
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static char rcsid[] DD_UNUSED = "$Id: cuddWindow.c,v 1.15 2012/02/05 01:07:19 fabio Exp $";
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#endif
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#ifdef DD_STATS
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extern int ddTotalNumberSwapping;
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extern int ddTotalNISwaps;
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#endif
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/*---------------------------------------------------------------------------*/
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/* Macro declarations */
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/*---------------------------------------------------------------------------*/
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/**AutomaticStart*************************************************************/
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/*---------------------------------------------------------------------------*/
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/* Static function prototypes */
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/*---------------------------------------------------------------------------*/
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static int ddWindow2 (DdManager *table, int low, int high);
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static int ddWindowConv2 (DdManager *table, int low, int high);
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static int ddPermuteWindow3 (DdManager *table, int x);
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static int ddWindow3 (DdManager *table, int low, int high);
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static int ddWindowConv3 (DdManager *table, int low, int high);
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static int ddPermuteWindow4 (DdManager *table, int w);
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static int ddWindow4 (DdManager *table, int low, int high);
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static int ddWindowConv4 (DdManager *table, int low, int high);
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/**AutomaticEnd***************************************************************/
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/*---------------------------------------------------------------------------*/
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/* Definition of exported functions */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* Definition of internal functions */
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/*---------------------------------------------------------------------------*/
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/**Function********************************************************************
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Synopsis [Reorders by applying the method of the sliding window.]
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Description [Reorders by applying the method of the sliding window.
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Tries all possible permutations to the variables in a window that
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slides from low to high. The size of the window is determined by
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submethod. Assumes that no dead nodes are present. Returns 1 in
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case of success; 0 otherwise.]
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SideEffects [None]
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******************************************************************************/
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int
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cuddWindowReorder(
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DdManager * table /* DD table */,
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int low /* lowest index to reorder */,
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int high /* highest index to reorder */,
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Cudd_ReorderingType submethod /* window reordering option */)
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{
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int res;
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#ifdef DD_DEBUG
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int supposedOpt;
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#endif
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switch (submethod) {
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case CUDD_REORDER_WINDOW2:
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res = ddWindow2(table,low,high);
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break;
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case CUDD_REORDER_WINDOW3:
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res = ddWindow3(table,low,high);
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break;
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case CUDD_REORDER_WINDOW4:
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res = ddWindow4(table,low,high);
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break;
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case CUDD_REORDER_WINDOW2_CONV:
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res = ddWindowConv2(table,low,high);
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break;
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case CUDD_REORDER_WINDOW3_CONV:
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res = ddWindowConv3(table,low,high);
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#ifdef DD_DEBUG
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supposedOpt = table->keys - table->isolated;
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res = ddWindow3(table,low,high);
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if (table->keys - table->isolated != (unsigned) supposedOpt) {
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(void) fprintf(table->err, "Convergence failed! (%d != %d)\n",
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table->keys - table->isolated, supposedOpt);
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}
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#endif
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break;
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case CUDD_REORDER_WINDOW4_CONV:
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res = ddWindowConv4(table,low,high);
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#ifdef DD_DEBUG
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supposedOpt = table->keys - table->isolated;
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res = ddWindow4(table,low,high);
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if (table->keys - table->isolated != (unsigned) supposedOpt) {
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(void) fprintf(table->err,"Convergence failed! (%d != %d)\n",
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table->keys - table->isolated, supposedOpt);
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}
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#endif
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break;
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default: return(0);
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}
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return(res);
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} /* end of cuddWindowReorder */
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/*---------------------------------------------------------------------------*/
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/* Definition of static functions */
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/*---------------------------------------------------------------------------*/
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/**Function********************************************************************
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Synopsis [Reorders by applying a sliding window of width 2.]
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Description [Reorders by applying a sliding window of width 2.
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Tries both permutations of the variables in a window
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that slides from low to high. Assumes that no dead nodes are
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present. Returns 1 in case of success; 0 otherwise.]
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SideEffects [None]
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******************************************************************************/
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static int
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ddWindow2(
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DdManager * table,
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int low,
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int high)
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{
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int x;
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int res;
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int size;
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#ifdef DD_DEBUG
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assert(low >= 0 && high < table->size);
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#endif
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if (high-low < 1) return(0);
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res = table->keys - table->isolated;
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for (x = low; x < high; x++) {
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size = res;
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res = cuddSwapInPlace(table,x,x+1);
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if (res == 0) return(0);
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if (res >= size) { /* no improvement: undo permutation */
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res = cuddSwapInPlace(table,x,x+1);
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if (res == 0) return(0);
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}
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#ifdef DD_STATS
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if (res < size) {
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(void) fprintf(table->out,"-");
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} else {
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(void) fprintf(table->out,"=");
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}
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fflush(table->out);
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#endif
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}
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return(1);
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} /* end of ddWindow2 */
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/**Function********************************************************************
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Synopsis [Reorders by repeatedly applying a sliding window of width 2.]
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Description [Reorders by repeatedly applying a sliding window of width
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2. Tries both permutations of the variables in a window
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that slides from low to high. Assumes that no dead nodes are
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present. Uses an event-driven approach to determine convergence.
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Returns 1 in case of success; 0 otherwise.]
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SideEffects [None]
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******************************************************************************/
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static int
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ddWindowConv2(
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DdManager * table,
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int low,
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int high)
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{
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int x;
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int res;
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int nwin;
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int newevent;
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int *events;
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int size;
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#ifdef DD_DEBUG
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assert(low >= 0 && high < table->size);
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#endif
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if (high-low < 1) return(ddWindowConv2(table,low,high));
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nwin = high-low;
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events = ALLOC(int,nwin);
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if (events == NULL) {
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table->errorCode = CUDD_MEMORY_OUT;
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return(0);
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}
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for (x=0; x<nwin; x++) {
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events[x] = 1;
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}
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res = table->keys - table->isolated;
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do {
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newevent = 0;
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for (x=0; x<nwin; x++) {
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if (events[x]) {
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size = res;
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res = cuddSwapInPlace(table,x+low,x+low+1);
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if (res == 0) {
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FREE(events);
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return(0);
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}
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if (res >= size) { /* no improvement: undo permutation */
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res = cuddSwapInPlace(table,x+low,x+low+1);
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if (res == 0) {
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FREE(events);
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return(0);
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}
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}
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if (res < size) {
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if (x < nwin-1) events[x+1] = 1;
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if (x > 0) events[x-1] = 1;
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newevent = 1;
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}
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events[x] = 0;
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#ifdef DD_STATS
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if (res < size) {
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(void) fprintf(table->out,"-");
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} else {
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(void) fprintf(table->out,"=");
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}
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fflush(table->out);
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#endif
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}
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}
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#ifdef DD_STATS
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if (newevent) {
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(void) fprintf(table->out,"|");
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fflush(table->out);
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}
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#endif
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} while (newevent);
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FREE(events);
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return(1);
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} /* end of ddWindowConv3 */
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/**Function********************************************************************
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Synopsis [Tries all the permutations of the three variables between
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x and x+2 and retains the best.]
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Description [Tries all the permutations of the three variables between
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x and x+2 and retains the best. Assumes that no dead nodes are
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present. Returns the index of the best permutation (1-6) in case of
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success; 0 otherwise.Assumes that no dead nodes are present. Returns
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the index of the best permutation (1-6) in case of success; 0
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otherwise.]
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SideEffects [None]
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******************************************************************************/
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static int
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ddPermuteWindow3(
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DdManager * table,
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int x)
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{
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int y,z;
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int size,sizeNew;
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int best;
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#ifdef DD_DEBUG
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assert(table->dead == 0);
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assert(x+2 < table->size);
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#endif
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size = table->keys - table->isolated;
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y = x+1; z = y+1;
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/* The permutation pattern is:
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** (x,y)(y,z)
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** repeated three times to get all 3! = 6 permutations.
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*/
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#define ABC 1
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best = ABC;
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#define BAC 2
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = BAC;
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size = sizeNew;
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}
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#define BCA 3
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = BCA;
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size = sizeNew;
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}
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#define CBA 4
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = CBA;
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size = sizeNew;
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}
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#define CAB 5
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = CAB;
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size = sizeNew;
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}
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#define ACB 6
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = ACB;
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size = sizeNew;
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}
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/* Now take the shortest route to the best permuytation.
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** The initial permutation is ACB.
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*/
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switch(best) {
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case BCA: if (!cuddSwapInPlace(table,y,z)) return(0);
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case CBA: if (!cuddSwapInPlace(table,x,y)) return(0);
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case ABC: if (!cuddSwapInPlace(table,y,z)) return(0);
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case ACB: break;
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case BAC: if (!cuddSwapInPlace(table,y,z)) return(0);
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case CAB: if (!cuddSwapInPlace(table,x,y)) return(0);
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break;
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default: return(0);
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}
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#ifdef DD_DEBUG
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assert(table->keys - table->isolated == (unsigned) size);
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#endif
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return(best);
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} /* end of ddPermuteWindow3 */
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/**Function********************************************************************
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Synopsis [Reorders by applying a sliding window of width 3.]
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|
|
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Description [Reorders by applying a sliding window of width 3.
|
|
Tries all possible permutations to the variables in a
|
|
window that slides from low to high. Assumes that no dead nodes are
|
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present. Returns 1 in case of success; 0 otherwise.]
|
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|
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SideEffects [None]
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******************************************************************************/
|
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static int
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ddWindow3(
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DdManager * table,
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int low,
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int high)
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{
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int x;
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int res;
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#ifdef DD_DEBUG
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assert(low >= 0 && high < table->size);
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#endif
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if (high-low < 2) return(ddWindow2(table,low,high));
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for (x = low; x+1 < high; x++) {
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res = ddPermuteWindow3(table,x);
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if (res == 0) return(0);
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#ifdef DD_STATS
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if (res == ABC) {
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(void) fprintf(table->out,"=");
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} else {
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(void) fprintf(table->out,"-");
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}
|
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fflush(table->out);
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#endif
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}
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|
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return(1);
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|
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} /* end of ddWindow3 */
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|
|
|
|
/**Function********************************************************************
|
|
|
|
Synopsis [Reorders by repeatedly applying a sliding window of width 3.]
|
|
|
|
Description [Reorders by repeatedly applying a sliding window of width
|
|
3. Tries all possible permutations to the variables in a
|
|
window that slides from low to high. Assumes that no dead nodes are
|
|
present. Uses an event-driven approach to determine convergence.
|
|
Returns 1 in case of success; 0 otherwise.]
|
|
|
|
SideEffects [None]
|
|
|
|
******************************************************************************/
|
|
static int
|
|
ddWindowConv3(
|
|
DdManager * table,
|
|
int low,
|
|
int high)
|
|
{
|
|
int x;
|
|
int res;
|
|
int nwin;
|
|
int newevent;
|
|
int *events;
|
|
|
|
#ifdef DD_DEBUG
|
|
assert(low >= 0 && high < table->size);
|
|
#endif
|
|
|
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if (high-low < 2) return(ddWindowConv2(table,low,high));
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|
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nwin = high-low-1;
|
|
events = ALLOC(int,nwin);
|
|
if (events == NULL) {
|
|
table->errorCode = CUDD_MEMORY_OUT;
|
|
return(0);
|
|
}
|
|
for (x=0; x<nwin; x++) {
|
|
events[x] = 1;
|
|
}
|
|
|
|
do {
|
|
newevent = 0;
|
|
for (x=0; x<nwin; x++) {
|
|
if (events[x]) {
|
|
res = ddPermuteWindow3(table,x+low);
|
|
switch (res) {
|
|
case ABC:
|
|
break;
|
|
case BAC:
|
|
if (x < nwin-1) events[x+1] = 1;
|
|
if (x > 1) events[x-2] = 1;
|
|
newevent = 1;
|
|
break;
|
|
case BCA:
|
|
case CBA:
|
|
case CAB:
|
|
if (x < nwin-2) events[x+2] = 1;
|
|
if (x < nwin-1) events[x+1] = 1;
|
|
if (x > 0) events[x-1] = 1;
|
|
if (x > 1) events[x-2] = 1;
|
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newevent = 1;
|
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break;
|
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case ACB:
|
|
if (x < nwin-2) events[x+2] = 1;
|
|
if (x > 0) events[x-1] = 1;
|
|
newevent = 1;
|
|
break;
|
|
default:
|
|
FREE(events);
|
|
return(0);
|
|
}
|
|
events[x] = 0;
|
|
#ifdef DD_STATS
|
|
if (res == ABC) {
|
|
(void) fprintf(table->out,"=");
|
|
} else {
|
|
(void) fprintf(table->out,"-");
|
|
}
|
|
fflush(table->out);
|
|
#endif
|
|
}
|
|
}
|
|
#ifdef DD_STATS
|
|
if (newevent) {
|
|
(void) fprintf(table->out,"|");
|
|
fflush(table->out);
|
|
}
|
|
#endif
|
|
} while (newevent);
|
|
|
|
FREE(events);
|
|
|
|
return(1);
|
|
|
|
} /* end of ddWindowConv3 */
|
|
|
|
|
|
/**Function********************************************************************
|
|
|
|
Synopsis [Tries all the permutations of the four variables between w
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and w+3 and retains the best.]
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Description [Tries all the permutations of the four variables between
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w and w+3 and retains the best. Assumes that no dead nodes are
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present. Returns the index of the best permutation (1-24) in case of
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success; 0 otherwise.]
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SideEffects [None]
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******************************************************************************/
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static int
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ddPermuteWindow4(
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DdManager * table,
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int w)
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{
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int x,y,z;
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int size,sizeNew;
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int best;
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#ifdef DD_DEBUG
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assert(table->dead == 0);
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assert(w+3 < table->size);
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#endif
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size = table->keys - table->isolated;
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x = w+1; y = x+1; z = y+1;
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/* The permutation pattern is:
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* (w,x)(y,z)(w,x)(x,y)
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* (y,z)(w,x)(y,z)(x,y)
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* repeated three times to get all 4! = 24 permutations.
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* This gives a hamiltonian circuit of Cayley's graph.
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* The codes to the permutation are assigned in topological order.
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* The permutations at lower distance from the final permutation are
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* assigned lower codes. This way we can choose, between
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* permutations that give the same size, one that requires the minimum
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* number of swaps from the final permutation of the hamiltonian circuit.
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* There is an exception to this rule: ABCD is given Code 1, to
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* avoid oscillation when convergence is sought.
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*/
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#define ABCD 1
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best = ABCD;
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#define BACD 7
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = BACD;
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size = sizeNew;
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}
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#define BADC 13
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = BADC;
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size = sizeNew;
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}
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#define ABDC 8
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size || (sizeNew == size && ABDC < best)) {
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if (sizeNew == 0) return(0);
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best = ABDC;
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size = sizeNew;
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}
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#define ADBC 14
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = ADBC;
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size = sizeNew;
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}
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#define ADCB 9
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size || (sizeNew == size && ADCB < best)) {
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if (sizeNew == 0) return(0);
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best = ADCB;
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size = sizeNew;
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}
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#define DACB 15
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = DACB;
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size = sizeNew;
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}
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#define DABC 20
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = DABC;
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size = sizeNew;
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}
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#define DBAC 23
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = DBAC;
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size = sizeNew;
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}
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#define BDAC 19
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size || (sizeNew == size && BDAC < best)) {
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if (sizeNew == 0) return(0);
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best = BDAC;
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size = sizeNew;
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}
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#define BDCA 21
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size || (sizeNew == size && BDCA < best)) {
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if (sizeNew == 0) return(0);
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best = BDCA;
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size = sizeNew;
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}
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#define DBCA 24
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size) {
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if (sizeNew == 0) return(0);
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best = DBCA;
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size = sizeNew;
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}
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#define DCBA 22
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size || (sizeNew == size && DCBA < best)) {
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if (sizeNew == 0) return(0);
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best = DCBA;
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size = sizeNew;
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}
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#define DCAB 18
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size || (sizeNew == size && DCAB < best)) {
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if (sizeNew == 0) return(0);
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best = DCAB;
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size = sizeNew;
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}
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#define CDAB 12
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size || (sizeNew == size && CDAB < best)) {
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if (sizeNew == 0) return(0);
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best = CDAB;
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size = sizeNew;
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}
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#define CDBA 17
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size || (sizeNew == size && CDBA < best)) {
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if (sizeNew == 0) return(0);
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best = CDBA;
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size = sizeNew;
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}
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#define CBDA 11
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size || (sizeNew == size && CBDA < best)) {
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if (sizeNew == 0) return(0);
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best = CBDA;
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size = sizeNew;
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}
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#define BCDA 16
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size || (sizeNew == size && BCDA < best)) {
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if (sizeNew == 0) return(0);
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best = BCDA;
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size = sizeNew;
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}
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#define BCAD 10
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size || (sizeNew == size && BCAD < best)) {
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if (sizeNew == 0) return(0);
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best = BCAD;
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size = sizeNew;
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}
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#define CBAD 5
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size || (sizeNew == size && CBAD < best)) {
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if (sizeNew == 0) return(0);
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best = CBAD;
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size = sizeNew;
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}
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#define CABD 3
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sizeNew = cuddSwapInPlace(table,x,y);
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if (sizeNew < size || (sizeNew == size && CABD < best)) {
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if (sizeNew == 0) return(0);
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best = CABD;
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size = sizeNew;
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}
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#define CADB 6
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size || (sizeNew == size && CADB < best)) {
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if (sizeNew == 0) return(0);
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best = CADB;
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size = sizeNew;
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}
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#define ACDB 4
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sizeNew = cuddSwapInPlace(table,w,x);
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if (sizeNew < size || (sizeNew == size && ACDB < best)) {
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if (sizeNew == 0) return(0);
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best = ACDB;
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size = sizeNew;
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}
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#define ACBD 2
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sizeNew = cuddSwapInPlace(table,y,z);
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if (sizeNew < size || (sizeNew == size && ACBD < best)) {
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if (sizeNew == 0) return(0);
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best = ACBD;
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size = sizeNew;
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}
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/* Now take the shortest route to the best permutation.
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** The initial permutation is ACBD.
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*/
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switch(best) {
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case DBCA: if (!cuddSwapInPlace(table,y,z)) return(0);
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case BDCA: if (!cuddSwapInPlace(table,x,y)) return(0);
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case CDBA: if (!cuddSwapInPlace(table,w,x)) return(0);
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case ADBC: if (!cuddSwapInPlace(table,y,z)) return(0);
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case ABDC: if (!cuddSwapInPlace(table,x,y)) return(0);
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case ACDB: if (!cuddSwapInPlace(table,y,z)) return(0);
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case ACBD: break;
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case DCBA: if (!cuddSwapInPlace(table,y,z)) return(0);
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case BCDA: if (!cuddSwapInPlace(table,x,y)) return(0);
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case CBDA: if (!cuddSwapInPlace(table,w,x)) return(0);
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if (!cuddSwapInPlace(table,x,y)) return(0);
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if (!cuddSwapInPlace(table,y,z)) return(0);
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break;
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case DBAC: if (!cuddSwapInPlace(table,x,y)) return(0);
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case DCAB: if (!cuddSwapInPlace(table,w,x)) return(0);
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case DACB: if (!cuddSwapInPlace(table,y,z)) return(0);
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case BACD: if (!cuddSwapInPlace(table,x,y)) return(0);
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case CABD: if (!cuddSwapInPlace(table,w,x)) return(0);
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break;
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case DABC: if (!cuddSwapInPlace(table,y,z)) return(0);
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case BADC: if (!cuddSwapInPlace(table,x,y)) return(0);
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case CADB: if (!cuddSwapInPlace(table,w,x)) return(0);
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if (!cuddSwapInPlace(table,y,z)) return(0);
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break;
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case BDAC: if (!cuddSwapInPlace(table,x,y)) return(0);
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case CDAB: if (!cuddSwapInPlace(table,w,x)) return(0);
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case ADCB: if (!cuddSwapInPlace(table,y,z)) return(0);
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case ABCD: if (!cuddSwapInPlace(table,x,y)) return(0);
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break;
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case BCAD: if (!cuddSwapInPlace(table,x,y)) return(0);
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case CBAD: if (!cuddSwapInPlace(table,w,x)) return(0);
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if (!cuddSwapInPlace(table,x,y)) return(0);
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break;
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default: return(0);
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}
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#ifdef DD_DEBUG
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assert(table->keys - table->isolated == (unsigned) size);
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#endif
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return(best);
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} /* end of ddPermuteWindow4 */
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/**Function********************************************************************
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Synopsis [Reorders by applying a sliding window of width 4.]
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Description [Reorders by applying a sliding window of width 4.
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Tries all possible permutations to the variables in a
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window that slides from low to high. Assumes that no dead nodes are
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present. Returns 1 in case of success; 0 otherwise.]
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SideEffects [None]
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******************************************************************************/
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static int
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ddWindow4(
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DdManager * table,
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int low,
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int high)
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{
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int w;
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int res;
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#ifdef DD_DEBUG
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assert(low >= 0 && high < table->size);
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#endif
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if (high-low < 3) return(ddWindow3(table,low,high));
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for (w = low; w+2 < high; w++) {
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res = ddPermuteWindow4(table,w);
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if (res == 0) return(0);
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#ifdef DD_STATS
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if (res == ABCD) {
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(void) fprintf(table->out,"=");
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} else {
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(void) fprintf(table->out,"-");
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}
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fflush(table->out);
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#endif
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}
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return(1);
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} /* end of ddWindow4 */
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/**Function********************************************************************
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Synopsis [Reorders by repeatedly applying a sliding window of width 4.]
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Description [Reorders by repeatedly applying a sliding window of width
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4. Tries all possible permutations to the variables in a
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window that slides from low to high. Assumes that no dead nodes are
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present. Uses an event-driven approach to determine convergence.
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Returns 1 in case of success; 0 otherwise.]
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SideEffects [None]
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******************************************************************************/
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static int
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ddWindowConv4(
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DdManager * table,
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int low,
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int high)
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{
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int x;
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int res;
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int nwin;
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int newevent;
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int *events;
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#ifdef DD_DEBUG
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assert(low >= 0 && high < table->size);
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#endif
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if (high-low < 3) return(ddWindowConv3(table,low,high));
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nwin = high-low-2;
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events = ALLOC(int,nwin);
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if (events == NULL) {
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table->errorCode = CUDD_MEMORY_OUT;
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return(0);
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}
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for (x=0; x<nwin; x++) {
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events[x] = 1;
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}
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do {
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newevent = 0;
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for (x=0; x<nwin; x++) {
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if (events[x]) {
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res = ddPermuteWindow4(table,x+low);
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switch (res) {
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case ABCD:
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break;
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case BACD:
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if (x < nwin-1) events[x+1] = 1;
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if (x > 2) events[x-3] = 1;
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newevent = 1;
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break;
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case BADC:
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if (x < nwin-3) events[x+3] = 1;
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if (x < nwin-1) events[x+1] = 1;
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if (x > 0) events[x-1] = 1;
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if (x > 2) events[x-3] = 1;
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newevent = 1;
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break;
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case ABDC:
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if (x < nwin-3) events[x+3] = 1;
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if (x > 0) events[x-1] = 1;
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newevent = 1;
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break;
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case ADBC:
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case ADCB:
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case ACDB:
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if (x < nwin-3) events[x+3] = 1;
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if (x < nwin-2) events[x+2] = 1;
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if (x > 0) events[x-1] = 1;
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if (x > 1) events[x-2] = 1;
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newevent = 1;
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break;
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case DACB:
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case DABC:
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case DBAC:
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case BDAC:
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case BDCA:
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case DBCA:
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case DCBA:
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case DCAB:
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case CDAB:
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case CDBA:
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case CBDA:
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case BCDA:
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case CADB:
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if (x < nwin-3) events[x+3] = 1;
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if (x < nwin-2) events[x+2] = 1;
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if (x < nwin-1) events[x+1] = 1;
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if (x > 0) events[x-1] = 1;
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if (x > 1) events[x-2] = 1;
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if (x > 2) events[x-3] = 1;
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newevent = 1;
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break;
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case BCAD:
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case CBAD:
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case CABD:
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if (x < nwin-2) events[x+2] = 1;
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if (x < nwin-1) events[x+1] = 1;
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if (x > 1) events[x-2] = 1;
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if (x > 2) events[x-3] = 1;
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newevent = 1;
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break;
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case ACBD:
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if (x < nwin-2) events[x+2] = 1;
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if (x > 1) events[x-2] = 1;
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newevent = 1;
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break;
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default:
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FREE(events);
|
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return(0);
|
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}
|
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events[x] = 0;
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#ifdef DD_STATS
|
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if (res == ABCD) {
|
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(void) fprintf(table->out,"=");
|
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} else {
|
|
(void) fprintf(table->out,"-");
|
|
}
|
|
fflush(table->out);
|
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#endif
|
|
}
|
|
}
|
|
#ifdef DD_STATS
|
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if (newevent) {
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|
(void) fprintf(table->out,"|");
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fflush(table->out);
|
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}
|
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#endif
|
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} while (newevent);
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|
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FREE(events);
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|
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return(1);
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|
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} /* end of ddWindowConv4 */
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