extended integer math with log2(uint8_t)

include/gp/math/integer_math.hpp

@@ -13,6 +13,21 @@ namespace gp {
 		Sean Eron Anderson
 		seander@cs.stanford.edu
 		**/
+		template<>
+		constexpr size_t log2<uint8_t>(uint8_t v)
+		{
+			constexpr int MultiplyDeBruijnBitPosition[8] = 
+			{
+				0, 5, 1, 6, 4, 3, 2, 7
+			};
+
+			v |= v >> 1;
+			v |= v >> 2;
+			v |= v >> 4;
+
+			return MultiplyDeBruijnBitPosition[(v * 29U) >> 5];
+		}
+
 		template<>
 		constexpr size_t log2<uint32_t>(uint32_t v)
 		{