| Sean Anderson | 6babd84 | 2023-07-31 17:27:33 -0400 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ | ||||
| 3 | #define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ | ||||
| 4 | |||||
| 5 | /** | ||||
| 6 | * fls - find last (most-significant) bit set | ||||
| 7 | * @x: the word to search | ||||
| 8 | * | ||||
| 9 | * This is defined the same way as ffs. | ||||
| 10 | * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. | ||||
| 11 | */ | ||||
| 12 | static __always_inline int fls(unsigned int x) | ||||
| 13 | { | ||||
| 14 | return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; | ||||
| 15 | } | ||||
| 16 | |||||
| 17 | #endif | ||||