361b44e571
* src/bddop.c, src/bddx.h, src/cache.c, src/cache.h, src/kernel.c, src/kernel.h, src/prime.c, src/prime.h, src/reorder.c: Use power of two for the sizes of all hash tables, in order to reduce the amount of divisions performed. Also allow bddhash to be smaller than bddnodes.
84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/*========================================================================
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Copyright (C) 1996-2002 by Jorn Lind-Nielsen
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All rights reserved
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Permission is hereby granted, without written agreement and without
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license or royalty fees, to use, reproduce, prepare derivative
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works, distribute, and display this software and its documentation
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for any purpose, provided that (1) the above copyright notice and
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the following two paragraphs appear in all copies of the source code
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and (2) redistributions, including without limitation binaries,
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reproduce these notices in the supporting documentation. Substantial
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modifications to this software may be copyrighted by their authors
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and need not follow the licensing terms described here, provided
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that the new terms are clearly indicated in all files where they apply.
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IN NO EVENT SHALL JORN LIND-NIELSEN, OR DISTRIBUTORS OF THIS
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SOFTWARE BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL,
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INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS
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SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE AUTHORS OR ANY OF THE
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ABOVE PARTIES HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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JORN LIND-NIELSEN SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE NO
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OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
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MODIFICATIONS.
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========================================================================*/
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/*************************************************************************
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$Header: /Volumes/CVS/repository/spot/spot/buddy/src/cache.c,v 1.2 2003/05/05 13:45:05 aduret Exp $
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FILE: cache.c
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DESCR: Cache class for caching apply/exist etc. results in BDD package
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AUTH: Jorn Lind
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DATE: (C) june 1997
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*************************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "kernel.h"
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#include "cache.h"
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#include "prime.h"
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/*************************************************************************
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*************************************************************************/
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void BddCache_reset(BddCache *cache)
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{
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int n;
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for (n = 0; n < cache->tablesize; n++)
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cache->table[n].i.a = -1;
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}
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int BddCache_init(BddCache *cache, int size)
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{
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size = bdd_nextpower(size);
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if ((cache->table=NEW(BddCacheData,size)) == NULL)
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return bdd_error(BDD_MEMORY);
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cache->tablesize = size;
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BddCache_reset(cache);
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return 0;
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}
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void BddCache_done(BddCache *cache)
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{
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free(cache->table);
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cache->table = NULL;
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cache->tablesize = 0;
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}
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int BddCache_resize(BddCache *cache, int newsize)
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{
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free(cache->table);
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return BddCache_init(cache, newsize);
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}
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/* EOF */
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