recover data_type.hpp

include/ck/utility/data_type.hpp

@@ -965,19 +965,6 @@ inline __host__ __device__ constexpr float type_convert<float, bhalf_t>(bhalf_t
 }
 
 // convert fp32 to bfp16
-#if FLASH_ATTENTION_INTERNAL_USE_RTZ
-template <>
-inline __host__ __device__ constexpr bhalf_t type_convert<bhalf_t, float>(float x)
-{
-    union
-    {
-        float fp32;
-        uint32_t int32;
-    } u = {static_cast<float>(x)};
-
-    return uint16_t(u.int32 >> 16);
-}
-#else
 template <>
 inline __host__ __device__ constexpr bhalf_t type_convert<bhalf_t, float>(float x)
 {
@@ -1020,7 +1007,6 @@ inline __host__ __device__ constexpr bhalf_t type_convert<bhalf_t, float>(float
 
     return uint16_t(u.int32 >> 16);
 }
-#endif
 
 // convert fp16 to bf16
 template <>