diff options
Diffstat (limited to 'src/include/lib.h')
| -rw-r--r-- | src/include/lib.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/lib.h b/src/include/lib.h index 46d8b02112..a0003d3e29 100644 --- a/src/include/lib.h +++ b/src/include/lib.h @@ -56,4 +56,8 @@ static inline int __ffs(u32 x) { return log2(x & (u32)(-(s32)x)); } /* Integer binary logarithm (rounding up): log2_ceil(0) == -1, log2(5) == 3 */ static inline int log2_ceil(u32 x) { return (x == 0) ? -1 : log2(x * 2 - 1); } +static inline int clz64(u64 x) { return x ? __builtin_clzll(x) : sizeof(x) * 8; } +static inline int log2_64(u64 x) { return sizeof(x) * 8 - clz64(x) - 1; } +static inline int __ffs64(u64 x) { return log2_64(x & (u64)(-(s64)x)); } + #endif /* __LIB_H__ */ |