Updates for 3.4 release. (#1305)

include/cute/numeric/math.hpp

@@ -310,4 +310,17 @@ safe_div(T const& t, U const& u) {
   return t / u;
 }
 
+/**
+ * log2 computation
+ */
+
+template <class T>
+CUTE_HOST_DEVICE constexpr
+auto
+log_2(T x) {
+  assert(x > 0);
+  static_assert(is_unsigned<T>::value, "Only to be used for unsigned integral types.");
+  return bit_width(x) - 1;
+}
+
 } // namespace cute