diff options
Diffstat (limited to 'include/asm-x86_64')
| -rw-r--r-- | include/asm-x86_64/bitops.h | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/include/asm-x86_64/bitops.h b/include/asm-x86_64/bitops.h index 3638fff..eb4df23 100644 --- a/include/asm-x86_64/bitops.h +++ b/include/asm-x86_64/bitops.h @@ -397,6 +397,22 @@ static __inline__ int fls64(__u64 x) } /** + * fls - find last bit set + * @x: the word to search + * + * This is defined the same way as ffs. + */ +static __inline__ int fls(int x) +{ + int r; + + __asm__("bsrl %1,%0\n\t" + "cmovzl %2,%0" + : "=&r" (r) : "rm" (x), "rm" (-1)); + return r+1; +} + +/** * hweightN - returns the hamming weight of a N-bit word * @x: the word to weigh * @@ -434,9 +450,6 @@ static __inline__ int fls64(__u64 x) #define minix_find_first_zero_bit(addr,size) \ find_first_zero_bit((void*)addr,size) -/* find last set bit */ -#define fls(x) generic_fls(x) - #endif /* __KERNEL__ */ #endif /* _X86_64_BITOPS_H */ |
