diff options
Diffstat (limited to 'include/asm-generic/bitops/builtin-fls.h')
-rw-r--r-- | include/asm-generic/bitops/builtin-fls.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/builtin-fls.h b/include/asm-generic/bitops/builtin-fls.h new file mode 100644 index 00000000000..eda652d0ac7 --- /dev/null +++ b/include/asm-generic/bitops/builtin-fls.h | |||
@@ -0,0 +1,16 @@ | |||
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 | ||