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Speed up dm_bit_get_next with ffs().

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This commit is contained in:
Alasdair Kergon 2010-04-19 17:17:55 +00:00
parent 1569059b2b
commit 803380c203
2 changed files with 4 additions and 10 deletions
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1
WHATS_NEW_DM
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@ -1,5 +1,6 @@
Version 1.02.47 -
=================================
Speed up dm_bit_get_next with ffs().
Version 1.02.46 - 14th April 2010
=================================

13
libdm/datastruct/bitset.c
View File

@ -52,18 +52,11 @@ void dm_bit_union(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2)
out[i] = in1[i] | in2[i];
}
/*
* FIXME: slow
*/
static inline int _test_word(uint32_t test, int bit)
static int _test_word(uint32_t test, int bit)
{
while (bit < (int) DM_BITS_PER_INT) {
if (test & (0x1 << bit))
return bit;
bit++;
}
int next_set_bit;
return -1;
return ((next_set_bit = ffs(test >> bit)) ? next_set_bit + bit - 1 : -1);
}
int dm_bit_get_next(dm_bitset_t bs, int last_bit)