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bitops: use a gcc builtin function instead of our __ffs

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Our __ffs implementation is straightforward and non-optimal,
__builtin_ffsl should be faster.

Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Andrei Vagin
2018-06-17 06:32:53 +03:00
parent 625fbb3f97
commit b2ec837f72
1 changed files with 1 additions and 11 deletions
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12
include/common/asm-generic/bitops.h
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@@ -57,17 +57,7 @@ static inline void clear_bit(int nr, volatile unsigned long *addr)
*/ */
static inline unsigned long __ffs(unsigned long word) static inline unsigned long __ffs(unsigned long word)
{ {
int p = 0; return __builtin_ffsl(word) - 1;
for (; p < 8*sizeof(word); ++p) {
if (word & 1) {
break;
}
word >>= 1;
}
return p;
} }
#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG) #define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)