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[buddy] use powers of two for the sizes of all hash tables

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* 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.
This commit is contained in:
Alexandre Duret-Lutz 2017-07-24 12:01:48 +02:00
parent 98e7e4e49a
commit 361b44e571
9 changed files with 48 additions and 25 deletions
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4
buddy/src/cache.h
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@ -57,7 +57,7 @@ typedef union
typedef struct
{
BddCacheData *table;
int tablesize;
int tablesize; /* a power of 2 */
} BddCache;
@ -66,7 +66,7 @@ extern void BddCache_done(BddCache *);
extern int BddCache_resize(BddCache *, int);
extern void BddCache_reset(BddCache *);
#define BddCache_lookup(cache, hash) (&(cache)->table[hash % (cache)->tablesize])
#define BddCache_lookup(cache, hash) (&(cache)->table[hash & ((cache)->tablesize - 1)])
#endif /* _CACHE_H */