| Catalin Marinas | 048fa2d | 2012-09-12 22:00:53 +0100 | [diff] [blame] | 1 | #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ |
| 2 | #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ | ||||
| 3 | |||||
| 4 | /** | ||||
| 5 | * fls - find last (most-significant) bit set | ||||
| 6 | * @x: the word to search | ||||
| 7 | * | ||||
| 8 | * This is defined the same way as ffs. | ||||
| 9 | * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. | ||||
| 10 | */ | ||||
| 11 | static __always_inline int fls(int x) | ||||
| 12 | { | ||||
| 13 | return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; | ||||
| 14 | } | ||||
| 15 | |||||
| 16 | #endif | ||||