Alpha Hash and Alpha2Coverage Implementation

core/typedefs.h

@@ -193,6 +193,20 @@ static inline unsigned int nearest_shift(unsigned int p_number) {
 	return 0;
 }
 
+// constexpr function to find the floored log2 of a number
+template <typename T>
+constexpr T floor_log2(T x) {
+	return x < 2 ? x : 1 + floor_log2(x >> 1);
+}
+
+// Get the number of bits needed to represent the number.
+// IE, if you pass in 8, you will get 4.
+// If you want to know how many bits are needed to store 8 values however, pass in (8 - 1).
+template <typename T>
+constexpr T get_num_bits(T x) {
+	return floor_log2(x);
+}
+
 // Swap 16, 32 and 64 bits value for endianness.
 #if defined(__GNUC__)
 #define BSWAP16(x) __builtin_bswap16(x)