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Minor optimalization of _test_word.

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Skip ffs() if  (test >> bit) is 0.
This commit is contained in:
Zdenek Kabelac 2010-07-08 12:16:16 +00:00
parent 71082be43a
commit 981adf4837
1 changed files with 2 additions and 2 deletions
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4
libdm/datastruct/bitset.c
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@ -69,9 +69,9 @@ void dm_bit_union(dm_bitset_t out, dm_bitset_t in1, dm_bitset_t in2)
static int _test_word(uint32_t test, int bit) static int _test_word(uint32_t test, int bit)
{ {
int next_set_bit; uint32_t tb = test >> bit;
return ((next_set_bit = ffs(test >> bit)) ? next_set_bit + bit - 1 : -1); return (tb ? ffs(tb) + bit - 1 : -1);
} }
int dm_bit_get_next(dm_bitset_t bs, int last_bit) int dm_bit_get_next(dm_bitset_t bs, int last_bit)