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-rw-r--r--src/include/lib.h4
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__ */