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Clean up code for hash table handling in ld.so.

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This commit is contained in:
Ulrich Drepper
2009-07-07 09:49:55 -07:00
parent a38862a589
commit eba0994e75
3 changed files with 74 additions and 69 deletions
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64
elf/dl-misc.c
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@ -312,3 +312,67 @@ _dl_name_match_p (const char *name, const struct link_map *map)
return 0;
}
unsigned long int
_dl_higher_prime_number (unsigned long int n)
{
/* These are primes that are near, but slightly smaller than, a
power of two. */
static const uint32_t primes[] = {
UINT32_C (7),
UINT32_C (13),
UINT32_C (31),
UINT32_C (61),
UINT32_C (127),
UINT32_C (251),
UINT32_C (509),
UINT32_C (1021),
UINT32_C (2039),
UINT32_C (4093),
UINT32_C (8191),
UINT32_C (16381),
UINT32_C (32749),
UINT32_C (65521),
UINT32_C (131071),
UINT32_C (262139),
UINT32_C (524287),
UINT32_C (1048573),
UINT32_C (2097143),
UINT32_C (4194301),
UINT32_C (8388593),
UINT32_C (16777213),
UINT32_C (33554393),
UINT32_C (67108859),
UINT32_C (134217689),
UINT32_C (268435399),
UINT32_C (536870909),
UINT32_C (1073741789),
UINT32_C (2147483647),
/* 4294967291L */
UINT32_C (2147483647) + UINT32_C (2147483644)
};
const uint32_t *low = &primes[0];
const uint32_t *high = &primes[sizeof (primes) / sizeof (primes[0])];
while (low != high)
{
const uint32_t *mid = low + (high - low) / 2;
if (n > *mid)
low = mid + 1;
else
high = mid;
}
#if 0
/* If we've run out of primes, abort. */
if (n > *low)
{
fprintf (stderr, "Cannot find prime bigger than %lu\n", n);
abort ();
}
#endif
return *low;
}