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064c636d JA |
1 | #ifndef FIO_FFZ_H |
2 | #define FIO_FFZ_H | |
3 | ||
4 | static inline int __ffs(int word) | |
5 | { | |
09174445 | 6 | int r = 0; |
064c636d JA |
7 | |
8 | if (!(word & 0xffff)) { | |
9 | word >>= 16; | |
10 | r += 16; | |
11 | } | |
12 | if (!(word & 0xff)) { | |
13 | word >>= 8; | |
14 | r += 8; | |
15 | } | |
16 | if (!(word & 0xf)) { | |
17 | word >>= 4; | |
18 | r += 4; | |
19 | } | |
20 | if (!(word & 3)) { | |
21 | word >>= 2; | |
22 | r += 2; | |
23 | } | |
24 | if (!(word & 1)) { | |
25 | word >>= 1; | |
26 | r += 1; | |
27 | } | |
28 | ||
29 | return r; | |
30 | } | |
31 | ||
32 | static inline int ffz(unsigned int bitmask) | |
33 | { | |
09174445 | 34 | return __ffs(~bitmask); |
064c636d JA |
35 | } |
36 | ||
37 | #endif |