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1 | #ifndef _ASM_GENERIC_BITOPS_FFS_H_ |
2 | #define _ASM_GENERIC_BITOPS_FFS_H_ |
3 | |
4 | /** |
5 | * ffs - find first bit set |
6 | * @x: the word to search |
7 | * |
8 | * This is defined the same way as |
9 | * the libc and compiler builtin ffs routines, therefore |
10 | * differs in spirit from the above ffz (man ffs). |
11 | */ |
12 | static inline int ffs(int x) |
13 | { |
14 | int r = 1; |
15 | |
16 | if (!x) |
17 | return 0; |
18 | if (!(x & 0xffff)) { |
19 | x >>= 16; |
20 | r += 16; |
21 | } |
22 | if (!(x & 0xff)) { |
23 | x >>= 8; |
24 | r += 8; |
25 | } |
26 | if (!(x & 0xf)) { |
27 | x >>= 4; |
28 | r += 4; |
29 | } |
30 | if (!(x & 3)) { |
31 | x >>= 2; |
32 | r += 2; |
33 | } |
34 | if (!(x & 1)) { |
35 | x >>= 1; |
36 | r += 1; |
37 | } |
38 | return r; |
39 | } |
40 | |
41 | #endif /* _ASM_GENERIC_BITOPS_FFS_H_ */ |
42 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9