Add log2 helper function

6 years ago · 9671dc573c
1 changed files with 8 additions and 0 deletions
--- a/riscv/arith.h
+++ b/riscv/arith.h
@ -166,4 +166,12 @@ static inline int clz(uint64_t val)
  return res;
 }

+static inline int log2(uint64_t val)
+{
+  if (!val)
+    return 0;
+
+  return 63 - clz(val);
+}
+
 #endif