Add scale <-> float conversions

include/ck/utility/e8m0_utils.hpp

@@ -8,4 +8,14 @@
 
 namespace ck::utils {
 
+__host__ __device__ inline float cast_to_float(e8m0_scale_t const scale)
+{
+    return std::pow(2, bit_cast<uint8_t>(scale) - NumericUtils<e8m0_scale_t>::bias);
+}
+
+__host__ __device__ inline e8m0_scale_t cast_from_float(float const scale)
+{
+    return static_cast<uint8_t>(std::log2(scale) + NumericUtils<e8m0_scale_t>::bias);
+}
+
 } // namespace ck::utils